[BUGFIX] add Health Check for Range over gRPC Connection Loop #2816
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📝 WalkthroughWalkthroughThe changes update several gRPC and connection management methods to include a Changes
Sequence Diagram(s)sequenceDiagram
participant Caller
participant gRPCClient
participant Pool
participant Metrics
Caller->>+gRPCClient: ConnectedAddrs(ctx)
gRPCClient->>+Pool: rangeConns(ctx, force, fn)
Pool-->>-gRPCClient: Healthy connections list
gRPCClient-->>-Caller: Returns connected addresses
Caller->>+gRPCClient: Close(ctx)
gRPCClient->>gRPCClient: Check context cancellation
gRPCClient->>+Pool: Disconnect(ctx)
Pool-->>-gRPCClient: Disconnect result
gRPCClient-->>-Caller: Return disconnection error/status
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Actionable comments posted: 1
🔭 Outside diff range comments (2)
internal/net/grpc/pool/pool_test.go (2)
Line range hint
4-9: Add test coverage for new context parameterSince the PR modifies the
Disconnectmethod to accept a context parameter, we should add specific test cases to verify context handling, including:
- Context cancellation
- Context timeout
- Context with values
Implement test cases focusing on connection health and lifecycle management
The test file contains comprehensive test function skeletons but lacks actual test implementations. Critical test cases should be added for:
Connection health checks:
- Test
IsHealthy()with various connection states- Verify health check behavior for both IP and DNS-based connections
- Test connection recovery after failures
Pool lifecycle management:
- Test
Connect(),Disconnect()with different pool sizes- Verify connection reuse and cleanup
- Test pool growth and shrinkage
Error handling:
- Test connection failures and recovery
- Verify backoff behavior
- Test DNS resolution failures
Thread safety:
- Test concurrent connection operations
- Verify atomic operations work correctly
- Test connection state transitions
The implementation shows sophisticated connection management that requires thorough testing to ensure reliability.
🔗 Analysis chain
Line range hint
1-2816: Implement missing test casesThe test file contains numerous TODO placeholders for test cases that need to be implemented, particularly for critical connection pool operations like
Connect,Disconnect,IsHealthy, etc. This is especially important given that this PR adds health check functionality.Let's verify which test cases need to be implemented:
Would you like me to help generate the test implementations, especially for the health check related functions?
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Find all TODO comments in test functions echo "Test functions missing implementations:" rg "TODO test cases" -A 1Length of output: 65653
Script:
#!/bin/bash # Check if this is a new file git log --diff-filter=A internal/net/grpc/pool/pool_test.go # Look for existing test implementations echo "Looking for existing test patterns..." rg "func Test.*pool" internal/net/grpc/pool/ # Check pool package implementation echo "Checking pool implementation..." cat internal/net/grpc/pool/pool.goLength of output: 23459
🧹 Nitpick comments (7)
internal/net/grpc/pool/pool.go (5)
136-136: Initial dial attempt.
Performing an early dial to validate connectivity is a good approach. Consider logging any partial failures or timeouts in detail for debugging.
299-301: Debug statements for unhealthy or empty pool case.
These logs are helpful. Verify they don't spam logs under high churn. Possibly use a higher log level if the condition might occur frequently.
620-620: getHealthyConn signature updated.
Inclusion of context for potential cancellation is beneficial in multi-tenant or high concurrency scenarios.
641-646: Refresh logic for newly loaded connection reference.
Ensures minimal downtime by attempting a re-dial promptly. Confirm we don’t skip adding a healthy fallback if this refresh fails.
768-769: Delay calculation for graceful shutdown.
The logic to keep a minimum threshold of 5ms is a good safeguard. Evaluate whether 5ms is enough in high-latency environments.internal/net/grpc/client.go (2)
289-289: Health check with rangeConns.
Similarly usesforce=true. Confirm that frequent forced checks do not degrade overall performance, especially under high node count.
704-704: RoundRobin with rangeConns.
Consider limiting how often you traverse all conns in round-robin if the number of addresses is large. The approach is correct, but we might add metrics or performance checks.
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📒 Files selected for processing (8)
internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(14 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
🔇 Additional comments (34)
internal/net/grpc/pool/pool.go (15)
33-34: New imports for status and codes look good.
These imports facilitate more granular error handling and condition checks based on gRPC status codes.
39-39: singleflight Group usage.
This allows consolidated connection requests to avoid duplicate dialing attempts. Ensure concurrency is handled properly within the group.
51-51: Signature changed to include context parameter.
Adding a context parameter forDisconnectis good practice to handle cancellation/deadlines in disconnection operations.
53-53: Signature refined to accept context parameter.
Allowing cancellation and deadlines inGetimproves reliability when retrieving pool connections.
78-78: Introducing a singleflight Group field.
Centralizing parallel dial attempts using singleflight is beneficial, but verify that no race conditions occur when multiple goroutines attempt connections simultaneously.
101-102: Group initialization.
The singleflight group is instantiated here. Confirm it’s not reinitialized elsewhere to prevent losing in-flight requests.
152-152: Second dial attempt if the first failed.
The fallback logic is clear. Ensure the re-dial does not hamper performance by excessive retries if the error persists.
231-235: Lock/unlock pattern.
Be sure no further operations in this function need read-write protection after unlocking. If anything modifiesp.poolor depends on its state, consider scoping it within the lock.
445-445: Disconnect now requires context.
Great for controlling behavior under timeouts. Ensure that callers handle or propagate the cancellation properly.
579-604: Connection check and refresh within Do.
- The approach to detect an error, close the failing conn, then refresh is sound.
- If the connection frequently oscillates between states, watch for potential overhead.
- The code merges fresh errors with existing errors using
errors.Join. This is best practice.
611-615: Refined Get method using context.
Returns nil if no healthy connection is found. This is correct. Confirm upstream callers handle the nil case effectively.
[approve]
633-633: Disconnect call on IP failure.
Disconnecting the entire pool on potential IP-based errors is a strong measure; ensure that repeated toggling doesn’t degrade performance or reliability.
654-655: Repeated check for healthy connection.
Prevent infinite recursion or excessive reload if the connection repeatedly flips to unhealthy. Might require a retry limit or backoff to mitigate flapping.
781-790: Timeout error vs. gRPC status error.
Careful handling of the context and the close error is done well. Ensure that in partial-failure scenarios, the rest of the pool remains operational.
802-806: Close on intermediate states.
Conditionally closing the connection if the state is less stable. The final fallback ensures no resource leakage on repeated tries.internal/net/grpc/client.go (11)
93-93: New ConnectedAddrs(ctx context.Context) method signature.
Allows cancellation or time-bound calls when enumerating addresses. Good improvement in concurrency-limited contexts.
252-252: Rebalancing connections in rangeConns.
Forcing a reconnect withforce=truecan be heavy. Ensure that this logic is only triggered at appropriate intervals to keep overhead manageable.
418-418: Use of rangeConns in Range method.
This is well-structured. If no connections exist, an error is promptly returned.
481-481: Parallel invocation in RangeConcurrent.
Ensures concurrency but watch for potential partial failures ifegctxis canceled. The code looks consistent.
568-568: Check for unhealthy connections in OrderedRange.
Storing them incrl.Store(addr, true)for re-connection attempts. Good approach, though watch for potential repeated flapping.
637-637: Similar logic for concurrency in OrderedRangeConcurrent.
Attaches concurrency limit while skipping unhealthy connections. This is consistent with RangeConcurrent’s approach.
1069-1069: Disconnect now uses context.
Ensuring individualized disconnection for each address. The usage of singleflight is well-structured to avoid repeated calls.
1088-1088: Updated ConnectedAddrs to accept context.
Matches the signature change enforced across the codebase.
1090-1091: rangeConns usage in ConnectedAddrs.
Context-based iteration for listing healthy addresses. This is consistent with existing patterns.
1107-1115: Graceful close of all connections.
Ensures each disconnection handles context cancellation. The approach withDisconnectis consistent.
1121-1140: rangeConns signature extended and logic revised.
forceparam to forcibly reconnect or check health.- Additional checks to see if each connection is healthy, else attempt re-connect.
- Disconnects if re-connection fails. This method is crucial to keep the pool stable.
internal/test/mock/grpc/grpc_client_mock.go (1)
54-54: Signature change to ConnectedAddrs now includes context.
Mock is aligned with the production code’s new signature. Ensure calls from unit tests include a valid context.internal/test/mock/grpc_testify_mock.go (1)
Line range hint
202-211: LGTM! Context parameter addition improves connection management.The addition of the context parameter to
ConnectedAddrsmethod aligns with proper context propagation practices and enables better control over the connection lifecycle.pkg/gateway/mirror/service/mirror.go (1)
163-163: LGTM! Context propagation in logging improves traceability.The addition of context to
ConnectedAddrscall in logging ensures proper context propagation and enables the health check mechanism to respect cancellation and timeouts.pkg/gateway/lb/handler/grpc/aggregation.go (3)
104-104: LGTM! Error visibility improvement.Added debug logging for context cancellation errors, which helps diagnose connection issues during health checks.
116-116: LGTM! Error visibility improvement.Added debug logging for deadline exceeded errors, which helps track timeout issues during health checks.
173-173: LGTM! Error visibility improvement.Added debug logging for retry attempt errors, which helps track connection recovery attempts during health checks.
Also applies to: 185-185
internal/net/grpc/client_test.go (2)
3110-3110: LGTM! Test updated to match implementation.Updated test to pass context.Background() to ConnectedAddrs, aligning with the implementation changes.
3306-3306: LGTM! Test signature updated.Added context parameter to rangeConns test signature to match implementation changes.
internal/net/grpc/pool/pool_test.go
Outdated
| @@ -2344,7 +2344,7 @@ package pool | |||
| // reconnectHash: test.fields.reconnectHash, | |||
| // } | |||
| // | |||
| // err := p.Disconnect() | |||
| // err := p.Disconnect(context.Background) | |||
There was a problem hiding this comment.
Fix incorrect context.Background usage
The code passes context.Background function value instead of calling it to create a context instance.
Apply this diff to fix the context creation:
-err := p.Disconnect(context.Background)
+err := p.Disconnect(context.Background())📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // err := p.Disconnect(context.Background) | |
| // err := p.Disconnect(context.Background()) |
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #2816 +/- ##
==========================================
+ Coverage 23.92% 24.32% +0.39%
==========================================
Files 547 540 -7
Lines 54586 53209 -1377
==========================================
- Hits 13061 12941 -120
+ Misses 40741 39498 -1243
+ Partials 784 770 -14 ☔ View full report in Codecov by Sentry. |
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Actionable comments posted: 0
🔭 Outside diff range comments (2)
internal/test/mock/grpc_testify_mock.go (1)
Line range hint
202-211: Update mock implementation to handle context parameter.The mock implementation of
ConnectedAddrsdoesn't use the newly added context parameter in theCalled()method. This could lead to inconsistencies in testing as the real implementation might use the context for cancellation or timeouts.Apply this diff to update the mock:
func (c *ClientInternal) ConnectedAddrs(ctx context.Context) []string { - args := c.Called() + args := c.Called(ctx) v, ok := args.Get(0).([]string) if !ok { // panic here like testify mock does panic(fmt.Sprintf("The provided arg(%v) is not type []string", args.Get(0))) } return v }internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-3000: Add test cases for the health check functionality.The test file contains many TODO placeholders without actual test implementations. Since this PR adds health check functionality for gRPC connection loops, please implement test cases that verify:
- Health check behavior during connection
- Health check during reconnection attempts
- Health check with various context cancellation scenarios
- Edge cases like timeout and network failures
This will help ensure the bugfix is working as expected.
🧹 Nitpick comments (2)
internal/net/grpc/pool/pool.go (1)
633-633: Forcing a disconnect upon inability to find a healthy connection.
While it effectively frees resources, a partial approach might be more efficient.internal/net/grpc/pool/pool_test.go (1)
2347-2347: Use a variable for context management.Instead of passing
context.Backgrounddirectly, store it in a variable first. This makes it easier to add timeouts or cancellation if needed in the future.- err := p.Disconnect(context.Background) + ctx := context.Background() + err := p.Disconnect(ctx)
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📒 Files selected for processing (8)
internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(14 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
🔇 Additional comments (46)
internal/net/grpc/pool/pool.go (25)
33-34: New imports for gRPC codes and status.
These imports allow finer-grained control over gRPC error codes and statuses.
39-39: Introduction of singleflight package import.
No functional issues identified.
51-51:Disconnectnow supports context propagation.
Ensures uniform context usage across methods.
53-53:Getmethod now requires a context parameter.
Enhances cancellation and timeout handling.
78-78: Singleflight group introduced.
This facilitates deduplicating concurrent calls to obtain connections.
101-102: Initialization of the singleflight group.
Looks straightforward with no concurrency pitfalls detected.
136-136: Dial call using context.
This ensures connection attempts properly honor cancellations/timeouts.
152-152: Fallback dial after scanning ports.
Implementation is coherent and handles connection failures gracefully.
231-231: Locking the pool for storing connections.
Correct use of mutex lock to ensure concurrency safety.
235-235: Corresponding unlock call.
Matches the lock at line 231, no issues.
299-299: Debug log for unhealthy connections.
Helps in diagnosing connection failures.
301-301: Debug log for empty pool scenario.
Useful trace message whenever the pool lacks established connections.
445-445: Context-awareDisconnectmethod implementation.
Ensures pool disconnection respects cancellations/timeouts.
579-580: Acquire a healthy connection index.
Properly checks the return flags before proceeding.
583-583: Local assignment ofconn.
Straightforward pointer usage.
585-595: Error-handling block with status checks.
Closes and logs connection errors if not canceled. This flow is clean.
597-602: Refresh connection and re-invoke function logic.
This approach robustly recovers from transient failures.
604-604: Joins original error with refresh error.
Produces a more comprehensive error chain.
611-615: Context-awareGetmethod implementation.
Successfully obtains a healthy connection or returns false.
620-620: Signature forgetHealthyConn.
No issues found with the new context usage.
641-642: Load and check healthy connection state.
Logical check ensures readiness before returning.
644-646: Refresh connection upon unhealthy detection.
Follows consistent retry pattern.
768-769: Minimum delay logic set to 5ms.
Prevents overly aggressive polling intervals.
781-789: Contextual close loop for connections.
Methodically handles shutting down varied connectivity states.
802-806: Closing connection on certain states.
Aligns with gRPC recommended approach for finalizing connections.internal/net/grpc/client.go (16)
93-93:ConnectedAddrssignature now includescontext.Context.
Enables context-based address retrieval.
252-252: Forcing reconnection checks inStartConnectionMonitor.
Ensures rebalancing logic is invoked.
289-289: Health check forced re-check.
Maintains consistency with the rebalancing logic.
418-418: Invocation ofrangeConnswith context inRange.
No concerns identified.
481-481: Concurrent usage ofrangeConns.
Implementation is aligned with concurrency best practices.
568-568: Skipping connections if not healthy inOrderedRange.
Appropriate fallback to avoid broken connections.
637-637: Skipping connections if not healthy inOrderedRangeConcurrent.
Consistent with logic in sequential version.
704-704:rangeConnscall inRoundRobin.
Probes next address if the current one is unavailable.
882-882: Error escalation withinconnectWithBackoff.
Effectively categorizes errors before backoff retry.
889-889: Retry logic onInternal,Unavailable, orResourceExhausted.
Complies with gRPC best practices for transient conditions.
1069-1069:p.Disconnectusage for cleanup.
Properly frees connection resources.
1088-1088: Method signature update forConnectedAddrs.
Consistent with the newly required context parameter.
1090-1091:rangeConnscall with force = false.
Maintains normal iteration logic across connections.
1107-1115: Context-basedCloseroutine.
Sequentially disconnects all addresses under cancellation control.
1121-1121:rangeConnsmethod signature withforceandctx.
No concerns regarding the parameter expansion.
1124-1140: Reconnection logic for unhealthy connections inrangeConns.
Safeguards pool integrity by reattempting or discarding dead connections.internal/test/mock/grpc/grpc_client_mock.go (1)
54-54:ConnectedAddrsmock method now accepts context.
Keeps the mock interface in sync with the real client signature.pkg/gateway/mirror/service/mirror.go (1)
163-163: LGTM!The change correctly passes the context to
ConnectedAddrsin the debug log statement.pkg/gateway/lb/handler/grpc/aggregation.go (1)
104-104: LGTM!The changes enhance error observability by adding debug logging in appropriate locations after error handling and before returning.
Also applies to: 116-116, 173-173, 185-185
internal/net/grpc/client_test.go (1)
3110-3110: LGTM!The test has been correctly updated to pass
context.Background()toConnectedAddrs, aligning with the interface change.internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-100: Well-structured test framework.The test file follows good testing practices:
- Table-driven tests for comprehensive coverage
- Helper functions for setup and teardown
- Clear error messages in check functions
- Proper use of test parallelization
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Actionable comments posted: 1
🔭 Outside diff range comments (1)
internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-2816: Critical: Implement missing test cases for gRPC connection pool.The test file contains numerous empty test functions with TODO comments. This indicates insufficient test coverage for critical gRPC connection pool functionality including:
- Connection management
- Pool initialization
- Health checks
- Error handling
- Resource cleanup
Please prioritize implementing test cases for at least these critical scenarios:
- Successful connection and disconnection
- Connection pool initialization with various configurations
- Health check functionality
- Error handling for network failures
- Resource cleanup on disconnection
- Connection pooling behavior (reuse, limits)
- Concurrent access scenarios
🧹 Nitpick comments (14)
internal/net/grpc/pool/pool.go (7)
53-53: Context parameter for Get method.
Providing a context for acquiring a connection allows cancellation or deadline handling if the pool is busy or slow.
136-136: Initial dial invocation.
Dialing once to validate connectivity is a good approach. Consider logging the dial success if it’s a critical path to further operations.
299-301: Detailed debug logs for connection establishment.
Providing pool index, size, and length in logs is helpful during debugging. Keep them at debug level to avoid noisy logs in production.
445-445: New Disconnect method with context.
This method carefully closes each connection in the pool and flushes the pool. Confirm that each connection respects context cancellation for faster cleanup.
620-620: New signature for getHealthyConn.
Adding relevant parameters for recursion counters is helpful. Ensure you exit early when the context is canceled to prevent infinite recursion.
641-642: Load check for healthy connections.
This ensures minimal overhead by reusing already-healthy connections. Watch out for potential data races if multiple goroutines callgetHealthyConnconcurrently.
644-646: Refresh connection fallback.
If the loaded connection is unhealthy, it’s renewed. Consider logging more details if repeated refresh attempts fail to identify flapping endpoints.internal/net/grpc/client.go (6)
252-252: rangeConns with force in pool rebalance.
Enabling a forced iteration to reconnect or rebuild connections is a neat approach. Watch out for performance overhead when force is true across large pools.
289-289: Health check iteration.
Periodic iteration withrangeConns(ctx, true, ...)triggers reconnection attempts. Double-check that logging remains at an appropriately low level for large scale deployments.
481-481: rangeConns for concurrent range.
Using an error group with concurrency is a solid pattern, as is skipping connections that are not healthy. Confirm consistent error handling for partial failures within the loop.
568-568: Check for healthy mock pool.
If a connection is unhealthy, you store reconnection requests incrl. Consider whether repeated logs or attempts for frequently failing addresses flood logs.
637-637: Parallel check for IsHealthy.
Similar to line 568, ensure that frequent health checks don’t cause log spam if the same address repeatedly times out.
1121-1140: rangeConns enhancements with force & health checks.
This block offers a flexible iteration for forced re-checks. The buddy approach ofp.Connectcalls is wise. If a reconnection fails, the code removes the unhealthy connection. Consider expanding logs for repeated failures.internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-2816: Good test structure, consider these improvements.The test structure follows good practices with:
- Table-driven tests
- Parallel execution support
- Memory leak detection
- Setup/teardown hooks
Consider these improvements:
- Add helper functions to reduce boilerplate in test cases
- Use test fixtures for common test data
- Group related test cases using subtests
- Add benchmark tests for performance-critical operations
- Consider using a test framework like testify for more concise assertions
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📒 Files selected for processing (8)
internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(14 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
✅ Files skipped from review due to trivial changes (1)
- pkg/gateway/mirror/service/mirror.go
👮 Files not reviewed due to content moderation or server errors (3)
- internal/test/mock/grpc_testify_mock.go
- pkg/gateway/lb/handler/grpc/aggregation.go
- internal/net/grpc/client_test.go
🔇 Additional comments (21)
internal/net/grpc/pool/pool.go (14)
33-34: Adoption of gRPC status and codes.
Usingcodesandstatusfrom gRPC helps differentiate and handle connection-related errors more precisely. This is beneficial for implementing robust error handling logic.
39-39: Use of singleflight for concurrent connection requests.
Instantiatingsingleflight.Groupto prevent redundant connection creation is a good choice for concurrency control.
51-51: Context-aware Disconnect signature.
Introducing acontext.Contextparameter toDisconnectis essential for graceful shutdown and cancellation. Make sure to check forctx.Err()within the method’s loops if necessary.
78-78: singleflight.Group for the pool struct.
Storingsingleflight.Group[Conn]in thepoolstruct creates a concurrency pattern for dialing. This approach should be carefully tested under high load to ensure it avoids potential bottlenecks.
101-102: Singleflight initialization.
Initializing the singleflight group ensures subsequent dial attempts are routed through one concurrency gate. Good for preventing race conditions.
152-152: Retry dial after port scan.
Re-attempting a dial with a scanned port is sensible. Ensure you handle partial successes or multiple scan attempts if ports are ephemeral or rotating.
231-235: Proper lock usage.
Acquiring a write lock before storing apoolConnensures synchronization. Confirm that the read locks are always released prior to any attempt at an upgrade to avoid potential deadlocks.
579-604: Enhanced error recovery in Do method.
The logic attempts to close the failing connection and refresh it. It handles gRPC code checks to decide whether or not to re-invoke the provided function. Ensure you handle each unique status code consistently, and consider surfacing repeated errors if repeated closings fail.
611-615: Context-based Get implementation.
A context-based approach is beneficial for controlled retrieval of connections. The fallback returns(nil, false)if no healthy connection is found. Good approach.
633-633: Disconnect if scanning fails.
If scanning the IP-based connections fails, you gracefully disconnect. Verify that partial disconnections do not leave the pool in a corrupt state if reconnection is attempted.
768-769: Minimum delay for closure.
Imposing a lower bound on the closing-tick interval ensures the system doesn’t spin too quickly. This is consistent with best practices.
781-789: Graceful close with context checks.
This code closes the connection upon context expiration and checks for non-canceled statuses. This is robust; just confirm no resource leaks if repeated close attempts fail.
802-806: Close attempt with transient connection states.
This block handles connect states other thanReady. Ensure that repeated attempts do not conflict with higher-level reconnection loops.
Line range hint
889-889: Return current error with isHealthy check.
Returning(nil, p.IsHealthy(ctx), err)is a clever approach to signal whether a retry might be feasible. Good design.internal/net/grpc/client.go (6)
93-93: Context-based ConnectedAddrs.
Switching from a parameterless method to one that acceptscontext.Contextis consistent with your approach to context-aware gRPC management.
418-418: rangeConns usage in Range.
This aligns theRangemethod’s iteration with the updated concurrency approach. The context is properly passed along for cancellation safety.
704-704: RoundRobin approach with rangeConns.
Involving a backoff to circuit-break repeated dial failures is prudent. Check for logic loops if every address is consistently unhealthy.
1069-1069: Disconnect invocation in group.
When removing a connection fromg.conns, ensure the reference count is properly decremented. This matches your usage ofatomic.AddUint64.
1088-1091: ConnectedAddrs revised with context.
Collecting healthy addresses viarangeConnsis essential to reflect real-time states. Good usage of context checks in the underlying pool.
1107-1115: Concurrent Close via Disconnect.
The function loops over stored addresses and callsDisconnectwith context. If an address is missing from the pool, you skip it gracefully. Solid approach.internal/test/mock/grpc/grpc_client_mock.go (1)
54-54: Mock method signature updated.
Updating the mockConnectedAddrsto accept a context mirrors the real client’s signature. This ensures consistent test coverage with the new context-aware method.
internal/net/grpc/pool/pool_test.go
Outdated
| @@ -2344,7 +2344,7 @@ package pool | |||
| // reconnectHash: test.fields.reconnectHash, | |||
| // } | |||
| // | |||
| // err := p.Disconnect() | |||
| // err := p.Disconnect(context.Background) | |||
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Fix incorrect context.Background usage.
The context is incorrectly passed as a type instead of calling the function to get a context instance.
Apply this fix:
-err := p.Disconnect(context.Background)
+err := p.Disconnect(context.Background())📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // err := p.Disconnect(context.Background) | |
| // err := p.Disconnect(context.Background()) |
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Actionable comments posted: 3
🔭 Outside diff range comments (1)
internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-2816: Implement missing test cases for critical pool operations.The test file has numerous empty test cases marked with TODO comments. These test cases cover critical pool operations that should be properly tested:
- Connection initialization and cleanup
- Pool scaling and management
- Health checks
- Connection refresh logic
- Error handling scenarios
Would you like me to help generate the test implementations for these critical operations? I can provide test cases that cover:
- Connection pool initialization with various configurations
- Connection health check scenarios
- Pool scaling under load
- Error handling for network failures
- Connection refresh and cleanup scenarios
🧹 Nitpick comments (12)
internal/net/grpc/pool/pool.go (4)
51-51: Update docstrings to reflect context parameter.The
Disconnect(ctx context.Context)andGet(ctx context.Context)methods now require a context, but there's no corresponding docstring update. Adding one clarifies their usage and ensures consistency with typical Go context patterns.- // Disconnect disconnects the pool. + // Disconnect disconnects the pool using the provided context. - // Get returns a client connection. + // Get retrieves a client connection using the provided context for cancellation or timeouts.Also applies to: 53-53
299-301: Improve log clarity with structured logging.These debug logs provide valuable insights into connection establishment. Enhance them with structured logs or additional metadata (e.g.,
log.With("index", idx+1, "pool_size", p.Size())...) to aid in troubleshooting.
620-620: Validate disconnection logic ingetHealthyConn.When the pool is empty or the retry count is exhausted, the code calls
p.Disconnect(ctx). Verify whether this is correct under partial failures. Disconnecting might hamper attempts to recover partially healthy connections. Evaluate whether partial reconnections are desired before forcibly discarding all connections.Also applies to: 633-633, 641-642, 644-646, 654-655
768-769: Document threshold for minor/major delay.Setting the minimum delay to 5ms and capping it at 5s or 1m is functional. Provide more context or constants for these magic numbers (e.g.,
minCloseDelay = 5 * time.Millisecond).internal/net/grpc/client.go (7)
289-289: Health check logic is expanded.The logic in the health-check branch now attempts reconnection if
IsHealthy(ctx)fails. Ensure that the caller or relevant goroutine maintains the correct backoff or circuit breaking to avoid hammering an unstable endpoint.
418-418: Centralize repeated callback patterns inRange&RangeConcurrent.Both methods rely on a similar flow for iterating addresses and applying a function. Consider consolidating shared logic in a small helper function to reduce duplication and improve maintainability.
Also applies to: 481-481
637-637: Avoid partial success overshadowing errors.In
OrderedRangeConcurrent, if a single address fails, the loop continues. Check if partial successes are acceptable or if the entire call should fail fast. Possibly add a user-configurable option to define the desired behavior.
704-704: Improve naming consistency.The variable
boNameis derived fromFromGRPCMethod. Using a more descriptive name (e.g.,methodName) might improve readability, especially since this is used to differentiate backoff policies.
1088-1088: Context introduction inConnectedAddrs.Like other context methods, ensure it’s utilized effectively if deeper health checks are added in the future. Currently,
rangeConns(ctx, false, ...)may not fully block or usectxfor cancellation inside the iteration. If expansion is planned, consider additional context cancellation points.Also applies to: 1090-1091
1107-1115: Validate final error joining inClose.If multiple addresses fail disconnection,
err = errors.Join(err, derr)accumulates them. Add more structured logs or a combined summary to highlight all addresses that failed to close. This helps with troubleshooting.
1121-1121: Force reconnection logic inrangeConns.When
forceis false, the method attempts aConnect(ctx). If that fails, we do aDisconnectof the partially healthy connection. Double-check that removing these addresses from the map is always desired. Consider a fallback or a “grace period” for repeated connection attempts.Also applies to: 1124-1140
internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-2816: Improve test coverage with integration and edge cases.The test file would benefit from additional test coverage in these areas:
- Integration scenarios with actual gRPC servers
- Edge cases like network partitions
- Race conditions in concurrent operations
- Resource cleanup verification
Consider adding the following test categories:
- Integration tests using test gRPC servers
- Stress tests for concurrent operations
- Cleanup verification tests
- Network failure simulation tests
📜 Review details
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Review profile: CHILL
Plan: Pro
📒 Files selected for processing (8)
internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(14 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
✅ Files skipped from review due to trivial changes (1)
- pkg/gateway/mirror/service/mirror.go
👮 Files not reviewed due to content moderation or server errors (3)
- internal/test/mock/grpc_testify_mock.go
- pkg/gateway/lb/handler/grpc/aggregation.go
- internal/net/grpc/client_test.go
🔇 Additional comments (12)
internal/net/grpc/pool/pool.go (7)
33-34: Validate new imports usage.Imports for
codesandstatusare introduced. Ensure that all references tostatusandcodesare necessary and consistently used for gRPC error handling to avoid confusion between standard errors and gRPC status errors.
39-39: Introduction ofsingleflight.Group[Conn].This helps prevent duplicate concurrent connection attempts. Monitor its usage carefully to avoid unexpected blocking or missed reconnections, especially under high load.
78-78: Good use of singleflight construction.Defining and initializing
p.group = singleflight.New[Conn]()helps coordinate concurrent attempts to retrieve or create connections. No concerns here as long as usage is concurrency-safe.Also applies to: 101-102
136-136: Check error handling logic around port scanning.When the initial
p.dial(ctx, p.addr)fails, the code attempts another port scan and dial. Make sure to handle the case whereerr == nilbutconnis accidentally nil to avoid proceeding with a nil connection object. Adding explicit checks can improve reliability.Also applies to: 152-152
231-235: Synchronized pool storage is correct.Locking around
p.pool[idx].Store(pc)is appropriate. Ensure that no additional references toidxorp.poolbypass this lock to avoid races.
611-615: Context parameter inGetis unused.This method calls
p.getHealthyConn(ctx, 0, p.Len())but doesn’t utilize thectxfor early exit checks beyond that. If wide usage of context cancellation is intended, consider additional context checks or timeouts. Otherwise, clarify the expected behavior.
781-789: Potential race in close logic.The ticker-based check closes the connection if the state transitions to
Idle,Connecting, orTransientFailure. Make sure other goroutines don’t simultaneously try to re-dial the same connection. This can lead to flapping if not carefully synchronized.Also applies to: 802-806
internal/net/grpc/client.go (4)
93-93: Context parameter inConnectedAddrs.Introducing
context.ContexttoConnectedAddrsis consistent with other context-aware methods. Confirm all callers pass proper contexts and handle cancellations/timeouts if health checks are performed inside the method.
252-252: Check concurrency inrangeConnswithforce = true.Enabling forceful rebalance can disrupt ongoing calls if multiple goroutines call
rangeConnsconcurrently, especially with partial successes or if any connection is mid-reconnect. Evaluate additional locking or queue-based approach if issues arise under high concurrency.
568-568: Short-circuit if a connection is invalid.Immediately storing
g.crl.Store(addr, true)offers a chance for the reconnection logic, but we skip directly to the next address. Fine for stability, but confirm that we indeed want to skip any attempt to fix the connection on the spot.
1069-1069: Disconnect concurrency.
p.Disconnect(ctx)is invoked within a singleflight group, which is fine. But confirm that concurrently callingDisconnecton the same address from multiple goroutines doesn’t yield race conditions or overshadow each other’s state changes.internal/test/mock/grpc/grpc_client_mock.go (1)
54-54: Mock signature alignment.The mock
ConnectedAddrs(_ context.Context)method now matches the real client’s signature. Looks good. Update relevant unit tests if any references to the old signature remain (passing no context).
internal/net/grpc/pool/pool.go
Outdated
| idx, pc, ok := p.getHealthyConn(ctx, 0, p.Len()) | ||
| if !ok || pc == nil || pc.conn == nil { | ||
| return errors.ErrGRPCClientConnNotFound(p.addr) | ||
| } | ||
| conn := pc.conn | ||
| err = f(conn) | ||
| if errors.Is(err, grpc.ErrClientConnClosing) { | ||
| if conn != nil { | ||
| if cerr := conn.Close(); cerr != nil && !errors.Is(cerr, grpc.ErrClientConnClosing) { | ||
| log.Warnf("Failed to close connection: %v", cerr) | ||
| if err != nil { | ||
| st, ok := status.FromError(err) | ||
| if ok && st != nil && st.Code() != codes.Canceled { // connection closing or closed | ||
| if conn != nil { | ||
| cerr := conn.Close() | ||
| if cerr != nil { | ||
| st, ok := status.FromError(cerr) | ||
| if ok && st != nil && st.Code() != codes.Canceled { // connection closing or closed | ||
| log.Warnf("Failed to close connection: %v", cerr) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| conn, err = p.dial(ctx, p.addr) | ||
| if err == nil && conn != nil && isHealthy(ctx, conn) { | ||
| p.store(idx, &poolConn{ | ||
| conn: conn, | ||
| addr: p.addr, | ||
| }) | ||
| if newErr := f(conn); newErr != nil { | ||
| return errors.Join(err, newErr) | ||
| rerr := p.refreshConn(ctx, idx, pc, p.addr) | ||
| if rerr == nil { | ||
| if newErr := f(p.load(idx).conn); newErr != nil { | ||
| return errors.Join(err, newErr) | ||
| } | ||
| return nil | ||
| } | ||
| return nil | ||
| err = errors.Join(err, rerr) |
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🛠️ Refactor suggestion
Avoid double invocation in Do() if the function is not idempotent.
When an error occurs, the code attempts to refresh the connection and re-invoke f(conn). If f triggers side effects, re-invocation might cause duplicate writes or other unexpected behavior. Ensure f is safe to call multiple times or consider a separate retry policy that clarifies potential side effects.
There was a problem hiding this comment.
Actionable comments posted: 1
🔭 Outside diff range comments (1)
internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-2816: Implement missing test cases for critical pool operations.The following critical pool operations lack test implementations:
Connect- Connection establishmentIsHealthy- Health check functionalityDo- Connection pool usageGet- Connection retrievallookupIPAddr- DNS resolutionscanGRPCPort- Port scanningrefreshConn- Connection refreshThese operations are crucial for the connection pool's reliability and should be thoroughly tested.
Would you like me to help generate the test implementations for these critical operations?
🧹 Nitpick comments (5)
internal/net/grpc/pool/pool.go (5)
231-235: Lock usage considerations
Consider wrapping unlock in a defer statement or using a dedicated helper to reduce the chance of missed unlocks in future code paths.
299-301: Potentially verbose debug logs
Repetitive logging in a loop could spam the logs. Consider rate-limiting or adjusting the log level.
579-604: Nested error handling
The nested structure adds complexity. Consider refactoring into smaller, self-contained methods to improve readability and testability.
Line range hint
620-646: Recursive logic in getHealthyConn
While functional, repeated recursion could be a concern for large retries. Evaluate an iterative approach or limit recursion depth.
Line range hint
768-806: Complex connection close procedure
The state-based close logic is robust but long. Breaking it into smaller functions may reduce potential maintenance overhead.
📜 Review details
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Plan: Pro
📒 Files selected for processing (8)
internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(14 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
🔇 Additional comments (19)
internal/net/grpc/pool/pool.go (10)
33-34: Use of gRPC codes and status
Good usage of the internal gRPC error codes and status packages to enhance error diagnostics.
39-39: Introduction of singleflight import
This import paves the way for concurrency control and avoids redundant calls.
51-51: Context-aware Disconnect method
Allowing acontext.Contextenhances timeout/cancellation handling during disconnection.
53-53: Context-aware Get method
Good to see this method now includes a context parameter for better control over cancellation.
78-78: Addition of singleflight.Group field
This field neatly coordinates concurrent connection attempts, adhering to concurrency best practices.
101-102: Initialization of the singleflight group
Instantiating the group ensures funneling of concurrent tasks.
136-136: Context-aware dial call
Dialing with context awareness bolsters resilience against connectivity delays.
152-152: Fallback dial logic
Retrying with a context-based dial is a solid approach for transient network errors.
445-445: Enhanced Disconnect method with context
This update aligns with the new context-based approach for more controlled teardown.
611-615: Streamlined Get method
LeveragesgetHealthyConneffectively; no issues found.internal/test/mock/grpc/grpc_client_mock.go (1)
54-54: Context parameter in ConnectedAddrs
Having a context argument ensures consistency with the rest of the gRPC client interface.internal/test/mock/grpc_testify_mock.go (1)
202-202: Context parameter in ClientInternal.ConnectedAddrs
Updating the signature to include context improves parity with other context-aware client methods.internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-2816: Verify test coverage for the gRPC connection pool.Let's check the current test coverage for this package:
pkg/gateway/mirror/service/mirror.go (1)
163-163: LGTM! Context propagation enhancement.The update to include context in
ConnectedAddrscall improves context propagation for connection health checks.Run the following script to verify consistent context usage in other mirror service methods:
✅ Verification successful
Context propagation is correctly implemented ✅
The
ConnectedAddrsmethod consistently uses context throughout the codebase, including the interface definition, implementation, mocks, and the mirror service usage.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify context propagation in mirror service methods # Test: Search for methods that might need context but don't have it ast-grep --pattern 'func ($recv *mirr) $name($params) $ret { $$$ $expr.ConnectedAddrs() $$$ }'Length of output: 102
Script:
#!/bin/bash # Search for all ConnectedAddrs calls and their context rg "ConnectedAddrs" -A 2 -B 2 # Find the gateway client interface definition ast-grep --pattern 'type $_ interface { $$$ ConnectedAddrs($_) $_ $$$ }'Length of output: 5729
pkg/gateway/lb/handler/grpc/aggregation.go (1)
104-104: LGTM! Enhanced error visibility.Added debug logging for error conditions improves troubleshooting capabilities for:
- Context cancellation
- Deadline exceeded scenarios
Also applies to: 116-116, 173-173, 185-185
internal/net/grpc/client.go (3)
93-93: LGTM! Enhanced context propagation in ConnectedAddrs.The addition of context parameter to
ConnectedAddrsimproves connection health check control.Also applies to: 1088-1094
1107-1115: LGTM! Improved connection cleanup.The
Closemethod now properly handles context cancellation when disconnecting clients.
1121-1140: LGTM! Enhanced connection iteration control.The
rangeConnsmethod improvements:
- Added context for cancellation control
- Added force parameter to conditionally bypass health checks
- Improved connection health recovery logic
internal/net/grpc/client_test.go (1)
3110-3110: LGTM! Updated test cases for context support.Test cases properly updated to match the new context-aware method signatures.
Also applies to: 3306-3306
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Actionable comments posted: 1
🧹 Nitpick comments (11)
internal/net/grpc/client.go (6)
Line range hint
289-317: Consider optimization for repeated health checks.
Similarly to the previous rebalance block, usingforce = truein the health check loop triggers reconnection attempts for all addresses with each tick, which can be expensive in busy environments. Ensure that reconnection logic aligns with expected overhead.
Line range hint
568-587: Check fallback behavior for invalid connections in OrderedRange.
Storing the address incrland logging a warning is fine, but review if repeatedly cycling invalid connections can add overhead. You might decide to limit the number of repeated attempts or log them less verbosely in production environments.
Line range hint
704-765: RoundRobin withrangeConns: watch out for repeatedcrl.Storeusage.
Marking addresses as unhealthy every time an error arises might oscillate the connection state. Confirm that subsequent re-checks or reconnect attempts remove or reset these addresses correctly to avoid indefinite marking of addresses as “unhealthy.”
1069-1069: Ensure context usage for disconnection doesn't swallow errors.
You're returningp.Disconnect(ctx)directly. Ifctxis canceled too soon, you might not fully disconnect resources. Consider logging or at least verifying potential leftover connections.
1107-1115: Graceful shutdown logic in Close.
Theselectcheck forctx.Done()before disconnecting addresses is a good pattern, though abrupt context cancellation may leave some connections undisconnected. If graceful closure is required, additional retry logic might be necessary.
1121-1140:rangeConnsmethod is powerful but large—consider further refactoring.
Forcing reconnection or skipping reconnection logic is controlled byforce. This method merges health checks, forced reconnect logic, and multiple nested conditions. Breaking them into smaller helper methods could improve readability and maintainability.pkg/gateway/lb/handler/grpc/aggregation.go (1)
104-104: Consider using structured logging with error context.The added debug logging is good for visibility, but could be enhanced by including additional context about the error state.
Consider updating the logging to include more context:
-log.Debug(err) +log.Debugf("BroadCast operation canceled for target %s: %v", target, err)Also applies to: 116-116, 173-173, 185-185
internal/net/grpc/pool/pool.go (3)
579-604: Improve error handling in Do() method.The error handling has been enhanced to properly handle gRPC status codes and connection refresh, but there's a potential improvement in the error handling flow.
Consider consolidating the error handling:
if err != nil { st, ok := status.FromError(err) - if ok && st != nil && st.Code() != codes.Canceled { // connection closing or closed + if ok && st != nil && st.Code() != codes.Canceled && st.Code() != codes.Unavailable { if conn != nil { cerr := conn.Close() if cerr != nil { st, ok := status.FromError(cerr) if ok && st != nil && st.Code() != codes.Canceled { log.Warnf("Failed to close connection: %v", cerr) } } } rerr := p.refreshConn(ctx, idx, pc, p.addr) if rerr == nil { if newErr := f(p.load(idx).conn); newErr != nil { return errors.Join(err, newErr) } return nil } err = errors.Join(err, rerr) } }
Line range hint
611-646: Enhance connection health check logic.The getHealthyConn implementation has been improved but could benefit from more robust health checking.
Consider adding connection state validation:
_, pc, ok := p.getHealthyConn(ctx, 0, p.Len()) if ok && pc != nil { + if pc.conn != nil && pc.conn.GetState() == connectivity.Ready { return pc.conn, true + } + return nil, false } return nil, false
Line range hint
768-806: Improve connection closing logic.The connection closing logic has been enhanced with better error handling, but the delay calculation could be improved.
Consider adjusting the delay calculation:
-if tdelay < time.Millisecond*5 { - tdelay = time.Millisecond * 5 -} else if tdelay > time.Minute { - tdelay = time.Second * 5 -} +tdelay = time.Duration(math.Min( + float64(time.Second*5), + math.Max(float64(time.Millisecond*5), float64(tdelay)), +))internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-3000: Consider enhancing test documentation and error messages.While the test structure is solid, consider these improvements:
- Add descriptive comments for each test case explaining the test scenario
- Include more detailed error messages in
checkFuncimplementations- Consider adding sub-tests for different error conditions
- Document the expected behavior in test case names
Example improvement for error messages:
defaultCheckFunc := func(w want, err error) error { if !errors.Is(err, w.err) { - return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err) + return errors.Errorf("unexpected error:\n\tgot: %v\n\twant: %v\n\ttest case: %s", + err, w.err, test.name) } return nil }
📜 Review details
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Plan: Pro
📒 Files selected for processing (8)
internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(14 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
✅ Files skipped from review due to trivial changes (1)
- pkg/gateway/mirror/service/mirror.go
🔇 Additional comments (12)
internal/net/grpc/client.go (7)
93-93: Add context parameter usage details to interface docstring.
The addition ofcontext.Contextis a good step to make this method consistent with other context-aware methods. Consider updating the interface/documentation to clarify how the context is used, e.g., whether it can cancel or time out the operation internally.
Line range hint
252-288: Validate potential performance overhead withforce = truein pool rebalance.
CallingrangeConns(ctx, true, ...)within the pool rebalance loop forces reconnection attempts for every address, which may introduce extra overhead for large numbers of connections. Ensure this behavior is intentional and consistent with performance requirements.
Line range hint
418-445: Confirm that skipping forced reconnect aligns withRangesemantics.
Here,rangeConns(ctx, false, ...)avoids forcing reconnections, which appears logical for a normal range operation. Double-check that any missed reconnect attempts do not introduce unexpected issues for use cases that rely on a fresh or always-healthy connection.
Line range hint
481-515: Concurrency logic looks correct, but verify error handling approach.
Concurrent operations withrangeConns(ctx, false, ...)plus an error group is well-structured. However, ensure partial errors from each goroutine are handled properly and do not silently fail if concurrency is set to a high value.
Line range hint
637-670: OrderedRangeConcurrent: consistency with single-threaded logic.
This segment replicates the same healthy-connection checks as the single-threaded approach. The concurrency approach looks consistent, but verify that partial successes still yield a correct final error in multi-address scenarios.
882-889: Rethink circuit breaker “ret” condition in connectWithBackoff.
Returningp.IsHealthy(ctx)as the second return value to the backoff logic influences whether errors are considered ignorable or retryable. Ensure that the pool's health check is the right gate for controlling circuit breaker transitions.
1088-1091: Context-based ConnectedAddrs is consistent with the rest of the interface.
Looks good. This approach ensures concurrency checks and cancellations can be respected when enumerating addresses.internal/test/mock/grpc/grpc_client_mock.go (1)
54-54: Unused context parameter.
Using_ context.Contextis valid for mock methods. If you need advanced context features in your mock logic (e.g., cancellation checks), consider removing the underscore to handle it. Otherwise, this is fine.internal/test/mock/grpc_testify_mock.go (1)
202-202: Context parameter consistency in mock method.
The newly addedctx context.Contextparam ensures API consistency. This approach is good as it aligns the mock with the updated interface.internal/net/grpc/pool/pool.go (1)
33-34: LGTM! Required imports for enhanced error handling.The addition of grpc codes and status imports aligns with the improved error handling implementation.
internal/net/grpc/client_test.go (1)
3110-3110: LGTM! Correctly updated test to use context.The test has been properly updated to match the new API signature requiring a context parameter.
internal/net/grpc/pool/pool_test.go (1)
Line range hint
1-3000: Implement missing test cases for connection management.The test file contains numerous TODO placeholders for test cases. Given that this code handles critical connection management functionality, it's important to have comprehensive test coverage, especially for:
- Connection lifecycle (connect, disconnect, reconnect)
- Connection pool management
- Health checks
- Error handling scenarios
- Context cancellation handling
Run the following script to check test coverage:
internal/net/grpc/pool/pool_test.go
Outdated
| @@ -2344,7 +2344,7 @@ package pool | |||
| // reconnectHash: test.fields.reconnectHash, | |||
| // } | |||
| // | |||
| // err := p.Disconnect() | |||
| // err := p.Disconnect(context.Background) | |||
There was a problem hiding this comment.
Fix syntax error in context.Background usage.
The context.Background is a function that needs to be called with parentheses to create a context instance.
Apply this diff to fix the syntax error:
- err := p.Disconnect(context.Background)
+ err := p.Disconnect(context.Background())📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // err := p.Disconnect(context.Background) | |
| err := p.Disconnect(context.Background()) |
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Actionable comments posted: 0
🧹 Nitpick comments (4)
internal/observability/metrics/grpc/grpc.go (1)
81-103: Consider error handling improvements in the callback function.The callback function could benefit from more robust error handling:
- The error from ObserveInt64 is not captured
- Consider adding debug logging for when len(ms) == 0
func (gm *grpcServerMetrics) Register(m metrics.Meter) error { healthyConn, err := m.Int64ObservableGauge( poolConnMetricsName, metrics.WithDescription(poolConnMetricsDescription), metrics.WithUnit(metrics.Dimensionless), ) if err != nil { return err } _, err = m.RegisterCallback( func(ctx context.Context, o api.Observer) error { ms := pool.Metrics(ctx) if len(ms) == 0 { + log.Debug("No pool metrics available") return nil } for name, cnt := range ms { - o.ObserveInt64(healthyConn, cnt, api.WithAttributes(attribute.String(gm.poolTargetAddrKey, name))) + if err := o.ObserveInt64(healthyConn, cnt, api.WithAttributes(attribute.String(gm.poolTargetAddrKey, name))); err != nil { + log.Warnf("Failed to observe pool connection metric: %v", err) + } } return nil }, healthyConn, ) return err }internal/net/grpc/client.go (1)
1121-1140: Consider adding timeout for connection health checks.The connection health check and reconnection logic in rangeConns could benefit from a timeout to prevent hanging in case of slow network conditions.
func (g *gRPCClient) rangeConns(ctx context.Context, force bool, fn func(addr string, p pool.Conn) bool) error { + const healthCheckTimeout = 5 * time.Second var cnt int g.conns.Range(func(addr string, p pool.Conn) bool { if force { cnt++ return fn(addr, p) } + hctx, cancel := context.WithTimeout(ctx, healthCheckTimeout) + defer cancel() - if p == nil || !p.IsHealthy(ctx) { - pc, err := p.Connect(ctx) - if pc == nil || err != nil || !pc.IsHealthy(ctx) { + if p == nil || !p.IsHealthy(hctx) { + pc, err := p.Connect(hctx) + if pc == nil || err != nil || !pc.IsHealthy(hctx) { if pc != nil { - if derr := pc.Disconnect(ctx); derr != nil { + if derr := pc.Disconnect(hctx); derr != nil { log.Debugf("Failed to disconnect unhealthy connection for %s: %v", addr, derr) } } log.Debugf("Unhealthy connection detected for %s during gRPC Connection Range over Loop:\t%s", addr, p.String()) return true } p = pc } cnt++ return fn(addr, p) }) if cnt == 0 { return errors.ErrGRPCClientConnNotFound("*") } return nil }internal/net/grpc/client_test.go (2)
3110-3110: Consider adding more test cases for context handling.While the change to use context.Background() is correct, consider adding test cases that verify behavior with:
- Cancelled context
- Context with timeout
- Context with values
Line range hint
1-1: Well-structured context-aware health check implementation.The changes form a cohesive improvement to the gRPC client's health checking capabilities:
- Proper context propagation throughout the connection management code
- New metrics for monitoring pool connection health
- Enhanced connection management with force parameter
- Improved error handling and logging
Consider documenting the new behavior in the package documentation to help users understand the health check mechanism.
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internal/backoff/backoff.go(2 hunks)internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(19 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/observability/metrics/grpc/grpc.go(3 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (6)
- pkg/gateway/lb/handler/grpc/aggregation.go
- internal/test/mock/grpc_testify_mock.go
- pkg/gateway/mirror/service/mirror.go
- internal/test/mock/grpc/grpc_client_mock.go
- internal/net/grpc/pool/pool.go
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🔇 Additional comments (6)
internal/observability/metrics/grpc/grpc.go (3)
32-34: LGTM! Well-defined metric constants.The new metric constants for pool connections are clearly named and documented.
37-39: LGTM! Clean struct extension.The poolTargetAddrKey field is appropriately added to the grpcServerMetrics struct.
69-77: LGTM! Proper metric view configuration.The pool connection metric view is correctly configured with:
- Appropriate name and description
- Sum aggregation which is suitable for connection counts
internal/backoff/backoff.go (1)
244-244: LGTM! Efficient use of maps.Clone.Good improvement using maps.Clone for a more concise and efficient implementation.
internal/net/grpc/client.go (2)
Line range hint
1088-1097: LGTM! Proper context usage in ConnectedAddrs.The ConnectedAddrs method now correctly uses context for health checks.
1107-1115: LGTM! Improved context handling in Close.The Close method now properly handles context cancellation during disconnection.
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🧹 Nitpick comments (4)
internal/observability/metrics/grpc/grpc.go (1)
81-103: Consider error handling improvements in the metrics callback.The metrics callback could benefit from additional error handling:
- The error from
ObserveInt64is not checked- Consider adding a timeout to prevent the callback from blocking too long
Apply this diff to improve error handling:
func (gm *grpcServerMetrics) Register(m metrics.Meter) error { healthyConn, err := m.Int64ObservableGauge( poolConnMetricsName, metrics.WithDescription(poolConnMetricsDescription), metrics.WithUnit(metrics.Dimensionless), ) if err != nil { return err } _, err = m.RegisterCallback( func(ctx context.Context, o api.Observer) error { + // Add timeout to prevent blocking + ctx, cancel := context.WithTimeout(ctx, 5*time.Second) + defer cancel() + ms := pool.Metrics(ctx) if len(ms) == 0 { return nil } for name, cnt := range ms { - o.ObserveInt64(healthyConn, cnt, api.WithAttributes(attribute.String(gm.poolTargetAddrKey, name))) + if err := o.ObserveInt64(healthyConn, cnt, api.WithAttributes(attribute.String(gm.poolTargetAddrKey, name))); err != nil { + return fmt.Errorf("failed to observe metric: %w", err) + } } return nil }, healthyConn, ) return err }internal/net/grpc/pool/pool.go (2)
92-95: Consider using a more thread-safe metrics collection.The global metrics map with mutex might not be the most efficient approach for high-concurrency scenarios. Consider using atomic operations or a more specialized concurrent data structure.
Consider using atomic values or a specialized concurrent map implementation for better performance:
-var ( - mu sync.RWMutex - metrics map[string]int64 = make(map[string]int64) -) +var metrics sync.MapThen update the Metrics function accordingly:
func Metrics(context.Context) map[string]int64 { - mu.RLock() - defer mu.RUnlock() - - if len(metrics) == 0 { - return nil - } - return maps.Clone(metrics) + result := make(map[string]int64) + metrics.Range(func(key, value interface{}) bool { + if k, ok := key.(string); ok { + if v, ok := value.(int64); ok { + result[k] = v + } + } + return true + }) + if len(result) == 0 { + return nil + } + return result }
593-618: Improve error handling in Do method.The error handling in the Do method has been improved with proper status code checks, but there's room for enhancement:
- The error from
f(conn)is wrapped twice when both refresh and retry fail- The connection state should be checked before executing
f(conn)Apply this diff to improve error handling:
func (p *pool) Do(ctx context.Context, f func(conn *ClientConn) error) (err error) { if p == nil { return errors.ErrGRPCClientConnNotFound("*") } idx, pc, ok := p.getHealthyConn(ctx, 0, p.Len()) if !ok || pc == nil || pc.conn == nil { return errors.ErrGRPCClientConnNotFound(p.addr) } conn := pc.conn + if !isHealthy(ctx, conn) { + return errors.ErrGRPCClientConnNotFound(p.addr) + } err = f(conn) if err != nil { st, ok := status.FromError(err) if ok && st != nil && st.Code() != codes.Canceled { if conn != nil { cerr := conn.Close() if cerr != nil { st, ok := status.FromError(cerr) if ok && st != nil && st.Code() != codes.Canceled { log.Warnf("Failed to close connection: %v", cerr) } } } rerr := p.refreshConn(ctx, idx, pc, p.addr) if rerr == nil { - if newErr := f(p.load(idx).conn); newErr != nil { - return errors.Join(err, newErr) + if pc := p.load(idx); pc != nil && isHealthy(ctx, pc.conn) { + if newErr := f(pc.conn); newErr != nil { + if st, ok := status.FromError(newErr); ok && st != nil { + return newErr // Return the new error as it's more relevant + } + return errors.Join(err, newErr) + } + return nil } - return nil } err = errors.Join(err, rerr) } } return err }internal/net/grpc/client.go (1)
Line range hint
1121-1147: Consider adding timeout to connection health checks.The rangeConns method could benefit from a timeout for health checks to prevent blocking too long on unresponsive connections.
Apply this diff to add timeout:
func (g *gRPCClient) rangeConns(ctx context.Context, force bool, fn func(addr string, p pool.Conn) bool) error { + // Add timeout for health checks + ctx, cancel := context.WithTimeout(ctx, 5*time.Second) + defer cancel() + var cnt int g.conns.Range(func(addr string, p pool.Conn) bool { if force { cnt++ return fn(addr, p) } if p == nil || !p.IsHealthy(ctx) { pc, err := p.Connect(ctx) if pc == nil || err != nil || !pc.IsHealthy(ctx) { if pc != nil { if derr := pc.Disconnect(ctx); derr != nil { log.Debugf("Failed to disconnect unhealthy connection for %s: %v", addr, derr) } } log.Debugf("Unhealthy connection detected for %s during gRPC Connection Range over Loop:\t%s", addr, p.String()) return true } p = pc } cnt++ return fn(addr, p) }) if cnt == 0 { return errors.ErrGRPCClientConnNotFound("*") } return nil }
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📒 Files selected for processing (11)
Makefile(1 hunks)internal/backoff/backoff.go(2 hunks)internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(20 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/observability/metrics/grpc/grpc.go(3 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (6)
- pkg/gateway/mirror/service/mirror.go
- internal/backoff/backoff.go
- pkg/gateway/lb/handler/grpc/aggregation.go
- internal/net/grpc/pool/pool_test.go
- internal/test/mock/grpc_testify_mock.go
- internal/test/mock/grpc/grpc_client_mock.go
🔇 Additional comments (8)
Makefile (1)
165-165: LGTM! The addition of security-related libraries enhances the build configuration.The changes add SSL and cryptographic capabilities by including
-lcurl,-lssl, and-lcryptlibraries to the linker flags.Let's verify that these libraries are available in the build environment:
internal/observability/metrics/grpc/grpc.go (3)
33-34: LGTM! Clear and descriptive metric names.The metric names and descriptions are well-chosen and follow consistent naming conventions.
37-39: LGTM! Good encapsulation of the target address key.The
poolTargetAddrKeyfield is appropriately added to the struct, allowing for consistent key usage across metrics.
69-77: LGTM! Well-structured metric view configuration.The pool connection metric view is properly configured with sum aggregation, which is appropriate for counting healthy connections.
internal/net/grpc/pool/pool.go (1)
861-869: LGTM! Well-implemented metrics collection function.The Metrics function properly handles the concurrent access to the metrics map and returns a copy to prevent external modifications.
internal/net/grpc/client.go (2)
Line range hint
1088-1098: LGTM! Proper context handling in ConnectedAddrs.The method correctly uses context for health checks and returns early on errors.
1107-1115: LGTM! Proper context handling in Close.The Close method properly handles context cancellation and error aggregation.
internal/net/grpc/client_test.go (1)
3110-3110: LGTM! Test updated to match new method signature.The test correctly uses context.Background() for the ConnectedAddrs call.
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🧹 Nitpick comments (4)
internal/net/grpc/client.go (1)
93-94: LGTM: Well-implemented health check enhancements.The changes successfully implement health checks for the gRPC connection loop, addressing the PR's objectives. The implementation:
- Properly handles context cancellation
- Includes comprehensive health checks
- Manages connection states effectively
- Provides appropriate error handling and logging
Consider adding metrics for:
- Connection health status
- Reconnection attempts
- Connection pool rebalancing operations
This would help in monitoring the health and performance of the gRPC connections.internal/net/grpc/client_test.go (3)
3110-3110: Consider testing context cancellation scenarios.While using
context.Background()works, consider adding test cases that verify context cancellation behavior to ensure proper context propagation.- gotAddrs := g.ConnectedAddrs(context.Background()) + // Test with both background and cancelled contexts + t.Run("with background context", func(t *testing.T) { + gotAddrs := g.ConnectedAddrs(context.Background()) + // ... assertions + }) + t.Run("with cancelled context", func(t *testing.T) { + ctx, cancel := context.WithCancel(context.Background()) + cancel() + gotAddrs := g.ConnectedAddrs(ctx) + // ... assertions for cancelled context behavior + })
44-81: Add test cases for the TODO sections.The test structure is well-designed but lacks actual test cases. Consider implementing test cases for:
- Empty/nil context scenarios
- Valid connection scenarios
- Error cases
- Edge cases
Would you like me to help generate test cases for these scenarios?
Also applies to: 159-246
1-3490: Consider adding benchmark tests for performance-critical operations.The test suite would benefit from benchmark tests for operations like connection handling and address management. This would help track performance impacts of changes.
Example benchmark test structure:
func BenchmarkGRPCClient_ConnectedAddrs(b *testing.B) { g := &gRPCClient{ // ... setup test client } b.ResetTimer() for i := 0; i < b.N; i++ { _ = g.ConnectedAddrs(context.Background()) } }
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Makefile.d/k3d.mk(3 hunks)internal/backoff/backoff.go(2 hunks)internal/net/grpc/client.go(12 hunks)internal/net/grpc/client_test.go(2 hunks)internal/net/grpc/pool/pool.go(19 hunks)internal/net/grpc/pool/pool_test.go(1 hunks)internal/observability/metrics/grpc/grpc.go(3 hunks)internal/test/mock/grpc/grpc_client_mock.go(1 hunks)internal/test/mock/grpc_testify_mock.go(1 hunks)pkg/gateway/lb/handler/grpc/aggregation.go(4 hunks)pkg/gateway/mirror/service/mirror.go(1 hunks)
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- pkg/gateway/mirror/service/mirror.go
- internal/test/mock/grpc_testify_mock.go
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- internal/backoff/backoff.go
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- internal/net/grpc/pool/pool_test.go
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🔇 Additional comments (11)
Makefile.d/k3d.mk (3)
20-20: LGTM: Network configuration added.The addition of
K3D_NETWORKvariable with thebridgevalue is a standard configuration for K3D clusters.
33-33: LGTM: Installation directory specified.The installation command now explicitly sets
/usr/binas the installation directory, which is a common system-wide binary location.
42-42: LGTM: Network configuration applied.The cluster creation command now uses the defined network configuration via
--network=$(K3D_NETWORK).internal/net/grpc/client.go (8)
1088-1100: LGTM: Enhanced connection health checks.The
ConnectedAddrsmethod now properly checks connection health using the provided context, improving reliability by only returning addresses with healthy connections.
1102-1119: LGTM: Improved graceful shutdown.The
Closemethod now handles context cancellation during disconnection, allowing for graceful shutdown of connections.
1121-1148: LGTM: Enhanced connection management.The
rangeConnsmethod now includes:
- Force parameter to control reconnection behavior
- Improved health check and reconnection logic
- Better error handling and logging for unhealthy connections
252-286: LGTM: Enhanced pool rebalancing.The pool rebalancing logic now properly handles connection health checks and reconnection attempts.
289-328: LGTM: Improved health check loop.The health check loop now includes proper error handling and reconnection logic for unhealthy connections.
418-445: LGTM: Enhanced Range and RangeConcurrent methods.Both methods now properly handle connection health checks and use the improved rangeConns functionality.
Also applies to: 481-525
568-572: LGTM: Improved OrderedRange and OrderedRangeConcurrent methods.Both methods now include proper health checks before processing connections.
Also applies to: 637-641
704-756: LGTM: Enhanced RoundRobin method.The RoundRobin implementation now properly handles connection health checks and uses the improved rangeConns functionality.
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🧹 Nitpick comments (1)
Makefile.d/k3d.mk (1)
45-46: Review kubelet eviction thresholds.The current configuration sets very aggressive eviction thresholds:
eviction-hardat 1% for both imagefs and nodefseviction-minimum-reclaimmatches the eviction thresholdThis configuration might cause:
- Frequent pod evictions in resource-constrained environments
- Continuous eviction cycles as the reclaim threshold matches the eviction threshold
Consider:
- Increasing the eviction thresholds to more conservative values (e.g., 5-10%)
- Setting the minimum reclaim lower than the eviction threshold to prevent eviction cycles
Example configuration:
---k3s-arg '--kubelet-arg=eviction-hard=imagefs.available<1%,nodefs.available<1%@agent:*' \ ---k3s-arg '--kubelet-arg=eviction-minimum-reclaim=imagefs.available=1%,nodefs.available=1%@agent:*' \ ++--k3s-arg '--kubelet-arg=eviction-hard=imagefs.available<5%,nodefs.available<5%@agent:*' \ ++--k3s-arg '--kubelet-arg=eviction-minimum-reclaim=imagefs.available=2%,nodefs.available=2%@agent:*' \
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🔇 Additional comments (1)
Makefile.d/k3d.mk (1)
20-20: Verify the usage of K3D_NETWORK variable.The K3D_NETWORK variable is defined but not used in any of the make targets in this file.
Run the following script to check if this variable is used elsewhere:
✅ Verification successful
Final Verification: K3D_NETWORK Variable Usage Confirmed
- The search shows that "K3D_NETWORK" appears only within
Makefile.d/k3d.mkand is not referenced in any other file.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check if K3D_NETWORK is used in other Makefiles or configuration files. # Search for K3D_NETWORK usage in all files rg -l "K3D_NETWORK" --type make --type yaml --type dockerfileLength of output: 96
Script:
#!/bin/bash # Description: Re-run search for K3D_NETWORK without restricting file types to capture all potential usage. rg -l "K3D_NETWORK"Length of output: 37
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v1.31.3-k3s1tov1.31.4-k3s1.