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language agnostic checkpointing for azure eventhub scaler
Signed-off-by: Christian Leinweber <christian.leinweber@maibornwolff.de>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,220 @@ | ||
| package azure | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/url" | ||
| "strconv" | ||
|
|
||
| "github.com/Azure/azure-storage-blob-go/azblob" | ||
| kedav1alpha1 "github.com/kedacore/keda/v2/api/v1alpha1" | ||
| "github.com/kedacore/keda/v2/pkg/util" | ||
| ) | ||
|
|
||
| // goCheckpoint struct to adapt GoSdk Checkpoint | ||
| type goCheckpoint struct { | ||
| Checkpoint struct { | ||
| SequenceNumber int64 `json:"sequenceNumber"` | ||
| Offset string `json:"offset"` | ||
| } `json:"checkpoint"` | ||
| PartitionID string `json:"partitionId"` | ||
| } | ||
|
|
||
| // Checkpoint is the object eventhub processor stores in storage | ||
| // for checkpointing event processors. This matches the object | ||
| // stored by the eventhub C# sdk and Java sdk | ||
| type Checkpoint struct { | ||
| Epoch int64 `json:"Epoch"` | ||
| Offset string `json:"Offset"` | ||
| Owner string `json:"Owner"` | ||
| Token string `json:"Token"` | ||
| PartitionID string `json:"PartitionId"` | ||
| SequenceNumber int64 `json:"SequenceNumber"` | ||
| } | ||
|
|
||
| type checkpointer interface { | ||
| resolvePath(info EventHubInfo) (*url.URL, error) | ||
| extractCheckpoint(get *azblob.DownloadResponse) (Checkpoint, error) | ||
| } | ||
|
|
||
| type azureWebjobCheckpointer struct { | ||
| partitionID string | ||
| containerName string | ||
| } | ||
|
|
||
| type defaultCheckpointer struct { | ||
| partitionID string | ||
| containerName string | ||
| } | ||
|
|
||
| type goSdkCheckpointer struct { | ||
| partitionID string | ||
| containerName string | ||
| } | ||
|
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| // GetCheckpointFromBlobStorage reads depending of the CheckpointType the checkpoint from a azure storage | ||
| func GetCheckpointFromBlobStorage(ctx context.Context, httpClient util.HTTPDoer, info EventHubInfo, partitionID string) (Checkpoint, error) { | ||
|
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| checkpointer := newCheckpointer(info, partitionID) | ||
| return getCheckpoint(ctx, httpClient, info, checkpointer) | ||
| } | ||
|
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||
| func newCheckpointer(info EventHubInfo, partitionID string) checkpointer { | ||
| if info.CheckpointType == "GoSdk" { | ||
| return &goSdkCheckpointer{ | ||
| containerName: info.BlobContainer, | ||
| partitionID: partitionID, | ||
| } | ||
| } else if info.CheckpointType == "AzureWebJob" || info.BlobContainer == "" { | ||
| return &azureWebjobCheckpointer{ | ||
| containerName: "azure-webjobs-eventhub", | ||
| partitionID: partitionID, | ||
| } | ||
| } else { | ||
| return &defaultCheckpointer{ | ||
| containerName: info.BlobContainer, | ||
| partitionID: partitionID, | ||
| } | ||
| } | ||
| } | ||
|
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| func (checkpointer *azureWebjobCheckpointer) resolvePath(info EventHubInfo) (*url.URL, error) { | ||
| eventHubNamespace, eventHubName, err := getHubAndNamespace(info) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // URL format - <storageEndpoint>/azure-webjobs-eventhub/<eventHubNamespace>/<eventHubName>/<eventHubConsumerGroup>/<partitionID> | ||
| path, _ := url.Parse(fmt.Sprintf("/%s/%s/%s/%s/%s", checkpointer.containerName, eventHubNamespace, eventHubName, info.EventHubConsumerGroup, checkpointer.partitionID)) | ||
|
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| return path, nil | ||
| } | ||
|
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| func (checkpointer *defaultCheckpointer) resolvePath(info EventHubInfo) (*url.URL, error) { | ||
| eventHubNamespace, eventHubName, err := getHubAndNamespace(info) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // URL format - <storageEndpoint>/azure-webjobs-eventhub/<eventHubNamespace>/<eventHubName>/<eventHubConsumerGroup>/<partitionID> | ||
| path, _ := url.Parse(fmt.Sprintf("/%s/%s/%s/%s/checkpoint/%s", checkpointer.containerName, eventHubNamespace, eventHubName, info.EventHubConsumerGroup, checkpointer.partitionID)) | ||
|
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| return path, nil | ||
| } | ||
|
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| // Resolve Path for AzureWebJob Checkpoint | ||
| func (checkpointer *goSdkCheckpointer) resolvePath(info EventHubInfo) (*url.URL, error) { | ||
| path, _ := url.Parse(fmt.Sprintf("/%s/%s", info.BlobContainer, checkpointer.partitionID)) | ||
|
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| return path, nil | ||
| } | ||
|
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||
| func (checkpointer *azureWebjobCheckpointer) extractCheckpoint(get *azblob.DownloadResponse) (Checkpoint, error) { | ||
| var checkpoint Checkpoint | ||
| err := readToCheckpointFromBody(get, &checkpoint) | ||
| if err != nil { | ||
| return Checkpoint{}, err | ||
| } | ||
|
|
||
| return checkpoint, nil | ||
| } | ||
|
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| func (checkpointer *defaultCheckpointer) extractCheckpoint(get *azblob.DownloadResponse) (Checkpoint, error) { | ||
| return getCheckpointFromStorageMetadata(get, checkpointer.partitionID) | ||
| } | ||
|
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||
| func (checkpointer *goSdkCheckpointer) extractCheckpoint(get *azblob.DownloadResponse) (Checkpoint, error) { | ||
| var checkpoint goCheckpoint | ||
| err := readToCheckpointFromBody(get, &checkpoint) | ||
| if err != nil { | ||
| return Checkpoint{}, err | ||
| } | ||
|
|
||
| return Checkpoint{ | ||
| SequenceNumber: checkpoint.Checkpoint.SequenceNumber, | ||
| Offset: checkpoint.Checkpoint.Offset, | ||
| PartitionID: checkpoint.PartitionID, | ||
| }, nil | ||
| } | ||
|
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||
| func getCheckpoint(ctx context.Context, httpClient util.HTTPDoer, info EventHubInfo, checkpointer checkpointer) (Checkpoint, error) { | ||
| blobCreds, storageEndpoint, err := ParseAzureStorageBlobConnection(httpClient, kedav1alpha1.PodIdentityProviderNone, info.StorageConnection, "") | ||
| if err != nil { | ||
| return Checkpoint{}, err | ||
| } | ||
|
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| path, err := checkpointer.resolvePath(info) | ||
| if err != nil { | ||
| return Checkpoint{}, err | ||
| } | ||
|
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| baseURL := storageEndpoint.ResolveReference(path) | ||
|
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| get, err := downloadBlob(ctx, baseURL, blobCreds) | ||
| if err != nil { | ||
| return Checkpoint{}, err | ||
| } | ||
|
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| return checkpointer.extractCheckpoint(get) | ||
| } | ||
|
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| func getCheckpointFromStorageMetadata(get *azblob.DownloadResponse, partitionID string) (Checkpoint, error) { | ||
| checkpoint := Checkpoint{ | ||
| PartitionID: partitionID, | ||
| } | ||
|
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| metadata := get.NewMetadata() | ||
|
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| if sequencenumber, ok := metadata["sequencenumber"]; ok { | ||
| if !ok { | ||
| if sequencenumber, ok = metadata["Sequencenumber"]; !ok { | ||
| return Checkpoint{}, fmt.Errorf("sequencenumber on blob not found") | ||
| } | ||
| } | ||
|
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||
| if sn, err := strconv.ParseInt(sequencenumber, 10, 64); err == nil { | ||
| checkpoint.SequenceNumber = sn | ||
| } else { | ||
| return Checkpoint{}, fmt.Errorf("sequencenumber is not a valid int64 value: %w", err) | ||
| } | ||
| } | ||
|
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| if offset, ok := metadata["offset"]; ok { | ||
| if !ok { | ||
| if offset, ok = metadata["Offset"]; !ok { | ||
| return Checkpoint{}, fmt.Errorf("offset on blob not found") | ||
| } | ||
| } | ||
| checkpoint.Offset = offset | ||
| } | ||
|
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| return checkpoint, nil | ||
| } | ||
|
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| func readToCheckpointFromBody(get *azblob.DownloadResponse, checkpoint interface{}) error { | ||
| blobData := &bytes.Buffer{} | ||
|
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| reader := get.Body(azblob.RetryReaderOptions{}) | ||
| if _, err := blobData.ReadFrom(reader); err != nil { | ||
| return fmt.Errorf("failed to read blob data: %s", err) | ||
| } | ||
| defer reader.Close() // The client must close the response body when finished with it | ||
|
|
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| if err := json.Unmarshal(blobData.Bytes(), &checkpoint); err != nil { | ||
| return fmt.Errorf("failed to decode blob data: %s", err) | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
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| func downloadBlob(ctx context.Context, baseURL *url.URL, blobCreds azblob.Credential) (*azblob.DownloadResponse, error) { | ||
| blobURL := azblob.NewBlockBlobURL(*baseURL, azblob.NewPipeline(blobCreds, azblob.PipelineOptions{})) | ||
|
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| get, err := blobURL.Download(ctx, 0, 0, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{}) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to download file from blob storage: %w", err) | ||
| } | ||
| return get, nil | ||
| } |
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