Enables zstd (for real this time)

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+
+#### Unreleased
+
+Improvements:
+- Enable zstd compression
+  ([1574](https://github.com/Shopify/sarama/pull/1574),
+  [1582](https://github.com/Shopify/sarama/pull/1582))
+
 #### Version 1.25.0 (2020-01-13)
 
 New Features:

config.go

@@ -629,6 +629,10 @@ func (c *Config) Validate() error {
 		}
 	}
 
+	if c.Producer.Compression == CompressionZSTD && !c.Version.IsAtLeast(V2_1_0_0) {
+		return ConfigurationError("zstd compression requires Version >= V2_1_0_0")
+	}
+
 	if c.Producer.Idempotent {
 		if !c.Version.IsAtLeast(V0_11_0_0) {
 			return ConfigurationError("Idempotent producer requires Version >= V0_11_0_0")

config_test.go

@@ -405,6 +405,18 @@ func TestLZ4ConfigValidation(t *testing.T) {
 	}
 }
 
+func TestZstdConfigValidation(t *testing.T) {
+	config := NewConfig()
+	config.Producer.Compression = CompressionZSTD
+	if err := config.Validate(); string(err.(ConfigurationError)) != "zstd compression requires Version >= V2_1_0_0" {
+		t.Error("Expected invalid zstd/kafka version error, got ", err)
+	}
+	config.Version = V2_1_0_0
+	if err := config.Validate(); err != nil {
+		t.Error("Expected zstd to work, got ", err)
+	}
+}
+
 // This example shows how to integrate with an existing registry as well as publishing metrics
 // on the standard output
 func ExampleConfig_metrics() {

consumer.go

@@ -888,6 +888,10 @@ func (bc *brokerConsumer) fetchNewMessages() (*FetchResponse, error) {
 		request.Isolation = bc.consumer.conf.Consumer.IsolationLevel
 	}
 
+	if bc.consumer.conf.Version.IsAtLeast(V2_1_0_0) {
+		request.Version = 10
+	}
+
 	for child := range bc.subscriptions {
 		request.AddBlock(child.topic, child.partition, child.offset, child.fetchSize)
 	}

functional_consumer_test.go

@@ -106,6 +106,21 @@ func TestVersionMatrixLZ4(t *testing.T) {
 	consumeMsgs(t, testVersions, producedMessages)
 }
 
+// Support for zstd codec was introduced in v2.1.0.0
+func TestVersionMatrixZstd(t *testing.T) {
+	setupFunctionalTest(t)
+	defer teardownFunctionalTest(t)
+
+	// Produce lot's of message with all possible combinations of supported
+	// protocol versions starting with v2.1.0.0 (first where zstd was supported)
+	testVersions := versionRange(V2_1_0_0)
+	allCodecs := []CompressionCodec{CompressionZSTD}
+	producedMessages := produceMsgs(t, testVersions, allCodecs, 17, 100, false)
+
+	// When/Then
+	consumeMsgs(t, testVersions, producedMessages)
+}
+
 func TestVersionMatrixIdempotent(t *testing.T) {
 	setupFunctionalTest(t)
 	defer teardownFunctionalTest(t)

produce_request.go

@@ -214,6 +214,8 @@ func (r *ProduceRequest) requiredVersion() KafkaVersion {
 		return V0_10_0_0
 	case 3:
 		return V0_11_0_0
+	case 7:
+		return V2_1_0_0
 	default:
 		return MinVersion
 	}

produce_response.go

@@ -5,11 +5,27 @@ import (
 	"time"
 )
 
+// Protocol, http://kafka.apache.org/protocol.html
+// v1
+// v2 = v3 = v4
+// v5 = v6 = v7
+// Produce Response (Version: 7) => [responses] throttle_time_ms
+//   responses => topic [partition_responses]
+//     topic => STRING
+//     partition_responses => partition error_code base_offset log_append_time log_start_offset
+//       partition => INT32
+//       error_code => INT16
+//       base_offset => INT64
+//       log_append_time => INT64
+//       log_start_offset => INT64
+//   throttle_time_ms => INT32
+
+// partition_responses in protocol
 type ProduceResponseBlock struct {
-	Err    KError
-	Offset int64
-	// only provided if Version >= 2 and the broker is configured with `LogAppendTime`
-	Timestamp time.Time
+	Err         KError    // v0, error_code
+	Offset      int64     // v0, base_offset
+	Timestamp   time.Time // v2, log_append_time, and the broker is configured with `LogAppendTime`
+	StartOffset int64     // v5, log_start_offset
 }
 
 func (b *ProduceResponseBlock) decode(pd packetDecoder, version int16) (err error) {
@@ -32,6 +48,13 @@ func (b *ProduceResponseBlock) decode(pd packetDecoder, version int16) (err erro
 		}
 	}
 
+	if version >= 5 {
+		b.StartOffset, err = pd.getInt64()
+		if err != nil {
+			return err
+		}
+	}
+
 	return nil
 }
 
@@ -49,13 +72,17 @@ func (b *ProduceResponseBlock) encode(pe packetEncoder, version int16) (err erro
 		pe.putInt64(timestamp)
 	}
 
+	if version >= 5 {
+		pe.putInt64(b.StartOffset)
+	}
+
 	return nil
 }
 
 type ProduceResponse struct {
-	Blocks       map[string]map[int32]*ProduceResponseBlock
+	Blocks       map[string]map[int32]*ProduceResponseBlock // v0, responses
 	Version      int16
-	ThrottleTime time.Duration // only provided if Version >= 1
+	ThrottleTime time.Duration // v1, throttle_time_ms
 }
 
 func (r *ProduceResponse) decode(pd packetDecoder, version int16) (err error) {
@@ -129,6 +156,7 @@ func (r *ProduceResponse) encode(pe packetEncoder) error {
 			}
 		}
 	}
+
 	if r.Version >= 1 {
 		pe.putInt32(int32(r.ThrottleTime / time.Millisecond))
 	}
@@ -143,19 +171,6 @@ func (r *ProduceResponse) version() int16 {
 	return r.Version
 }
 
-func (r *ProduceResponse) requiredVersion() KafkaVersion {
-	switch r.Version {
-	case 1:
-		return V0_9_0_0
-	case 2:
-		return V0_10_0_0
-	case 3:
-		return V0_11_0_0
-	default:
-		return MinVersion
-	}
-}
-
 func (r *ProduceResponse) GetBlock(topic string, partition int32) *ProduceResponseBlock {
 	if r.Blocks == nil {
 		return nil

produce_response_test.go

@@ -10,8 +10,8 @@ var (
 	produceResponseNoBlocksV0 = []byte{
 		0x00, 0x00, 0x00, 0x00}
 
-	produceResponseManyBlocksVersions = [][]byte{
-		{
+	produceResponseManyBlocksVersions = map[int][]byte{
+		0: {
 			0x00, 0x00, 0x00, 0x01,
 
 			0x00, 0x03, 'f', 'o', 'o',
@@ -20,7 +20,9 @@ var (
 			0x00, 0x00, 0x00, 0x01, // Partition 1
 			0x00, 0x02, // ErrInvalidMessage
 			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, // Offset 255
-		}, {
+		},
+
+		1: {
 			0x00, 0x00, 0x00, 0x01,
 
 			0x00, 0x03, 'f', 'o', 'o',
@@ -31,7 +33,8 @@ var (
 			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, // Offset 255
 
 			0x00, 0x00, 0x00, 0x64, // 100 ms throttle time
-		}, {
+		},
+		2: {
 			0x00, 0x00, 0x00, 0x01,
 
 			0x00, 0x03, 'f', 'o', 'o',
@@ -42,6 +45,20 @@ var (
 			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, // Offset 255
 			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xE8, // Timestamp January 1st 0001 at 00:00:01,000 UTC (LogAppendTime was used)
 
+			0x00, 0x00, 0x00, 0x64, // 100 ms throttle time
+		},
+		7: { // version 7 adds StartOffset
+			0x00, 0x00, 0x00, 0x01,
+
+			0x00, 0x03, 'f', 'o', 'o',
+			0x00, 0x00, 0x00, 0x01,
+
+			0x00, 0x00, 0x00, 0x01, // Partition 1
+			0x00, 0x02, // ErrInvalidMessage
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, // Offset 255
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xE8, // Timestamp January 1st 0001 at 00:00:01,000 UTC (LogAppendTime was used)
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, // StartOffset 50
+
 			0x00, 0x00, 0x00, 0x64, // 100 ms throttle time
 		},
 	}
@@ -69,14 +86,19 @@ func TestProduceResponseDecode(t *testing.T) {
 			t.Error("Decoding did not produce a block for foo/1")
 		} else {
 			if block.Err != ErrInvalidMessage {
-				t.Error("Decoding failed for foo/2/Err, got:", int16(block.Err))
+				t.Error("Decoding failed for foo/1/Err, got:", int16(block.Err))
 			}
 			if block.Offset != 255 {
 				t.Error("Decoding failed for foo/1/Offset, got:", block.Offset)
 			}
 			if v >= 2 {
 				if block.Timestamp != time.Unix(1, 0) {
-					t.Error("Decoding failed for foo/2/Timestamp, got:", block.Timestamp)
+					t.Error("Decoding failed for foo/1/Timestamp, got:", block.Timestamp)
+				}
+			}
+			if v >= 7 {
+				if block.StartOffset != 50 {
+					t.Error("Decoding failed for foo/1/StartOffset, got:", block.StartOffset)
 				}
 			}
 		}
@@ -95,9 +117,10 @@ func TestProduceResponseEncode(t *testing.T) {
 
 	response.Blocks["foo"] = make(map[int32]*ProduceResponseBlock)
 	response.Blocks["foo"][1] = &ProduceResponseBlock{
-		Err:       ErrInvalidMessage,
-		Offset:    255,
-		Timestamp: time.Unix(1, 0),
+		Err:         ErrInvalidMessage,
+		Offset:      255,
+		Timestamp:   time.Unix(1, 0),
+		StartOffset: 50,
 	}
 	response.ThrottleTime = 100 * time.Millisecond
 	for v, produceResponseManyBlocks := range produceResponseManyBlocksVersions {

produce_set.go

@@ -129,6 +129,10 @@ func (ps *produceSet) buildRequest() *ProduceRequest {
 		req.Version = 3
 	}
 
+	if ps.parent.conf.Producer.Compression == CompressionZSTD && ps.parent.conf.Version.IsAtLeast(V2_1_0_0) {
+		req.Version = 7
+	}
+
 	for topic, partitionSets := range ps.msgs {
 		for partition, set := range partitionSets {
 			if req.Version >= 3 {