diff --git a/examples/README.md b/examples/README.md index b7db36365..cdd3ff157 100644 --- a/examples/README.md +++ b/examples/README.md @@ -8,3 +8,6 @@ In these examples, we use `github.com/Shopify/sarama` as import path. We do this [http_server](./http_server) is a simple HTTP server uses both the sync producer to produce data as part of the request handling cycle, as well as the async producer to maintain an access log. It also uses the [mocks subpackage](https://godoc.org/github.com/Shopify/sarama/mocks) to test both. +#### Interceptors + +Basic example to use a producer interceptor that produces oTel spans and add some headers for each intercepted message. diff --git a/examples/consumergroup/go.mod b/examples/consumergroup/go.mod index 018fabe96..b47253f1f 100644 --- a/examples/consumergroup/go.mod +++ b/examples/consumergroup/go.mod @@ -1,5 +1,7 @@ module github.com/Shopify/sarama/examples/consumer +go 1.14 + replace github.com/Shopify/sarama => ../../ -require github.com/Shopify/sarama v1.22.0 +require github.com/Shopify/sarama v1.27.0 diff --git a/examples/consumergroup/go.sum b/examples/consumergroup/go.sum index b21898335..a60abde0b 100644 --- a/examples/consumergroup/go.sum +++ b/examples/consumergroup/go.sum @@ -1,34 +1,77 @@ -github.com/DataDog/zstd v1.3.6-0.20190409195224-796139022798 h1:2T/jmrHeTezcCM58lvEQXs0UpQJCo5SoGAcg+mbSTIg= -github.com/DataDog/zstd 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include some headers. + +``` go +conf.Producer.Interceptors = []sarama.ProducerInterceptor{xxx} +``` + +## Run the example +- `go run main.go trace_interceptor.go`. +- or `go build and pass different parameters. +``` sh +go build && ./interceptors --h +Usage of ./interceptors: + -brokers string + The Kafka brokers to connect to, as a comma separated list (default "localhost:9092") + -topic string + The Kafka topic to use (default "default_topic") +``` + +App will output oTel spans for every intercepted message, i.e: + +``` +go run main.go trace_interceptor.go +[Sarama] 2020/08/11 11:35:56 Initializing new client +[Sarama] 2020/08/11 11:35:56 ClientID is the default of 'sarama', you should consider setting it to something application-specific. +[Sarama] 2020/08/11 11:35:56 ClientID is the default of 'sarama', you should consider setting it to something application-specific. +[Sarama] 2020/08/11 11:35:56 client/metadata fetching metadata for all topics from broker localhost:9092 +[Sarama] 2020/08/11 11:35:56 Connected to broker at localhost:9092 (unregistered) +[Sarama] 2020/08/11 11:35:56 client/brokers registered new broker #1 at localhost:9092 +[Sarama] 2020/08/11 11:35:56 Successfully initialized new client +INFO[0000] Starting to produce 2 messages every 5s +INFO[0005] producing 2 messages at 2020-08-11T11:36:01-07:00 topic=default_topic +[ + { + "SpanContext": { + "TraceID": "2c4210c1d6c2ebe758eb41cbc95a0478", + "SpanID": "046bfc6d6db17ed7", + "TraceFlags": 1 + }, + "ParentSpanID": "0000000000000000", + "SpanKind": 1, + "Name": "default_topic", + "StartTime": "2020-08-11T11:36:01.57487-07:00", + "EndTime": "2020-08-11T11:36:01.574891849-07:00", + "Attributes": [ + { + "Key": "messaging.destination_kind", + "Value": { "Type": "STRING", "Value": "topic" } + }, + { + "Key": "span.otel.kind", + "Value": { "Type": "STRING", "Value": "PRODUCER" } + }, + { + "Key": "messaging.system", + "Value": { "Type": "STRING", "Value": "kafka" } + }, + { + "Key": "net.transport", + "Value": { "Type": "STRING", "Value": "IP.TCP" } + }, + { + "Key": "messaging.url", + "Value": { "Type": "STRING", "Value": "localhost:9092" } + }, + { + "Key": "messaging.destination", + "Value": { "Type": "STRING", "Value": "default_topic" } + }, + { + "Key": "messaging.message_id", + "Value": { "Type": "STRING", "Value": "046bfc6d6db17ed7" } + } + ], + "MessageEvents": null, + "Links": null, + "StatusCode": 0, + "StatusMessage": "", + "HasRemoteParent": false, + "DroppedAttributeCount": 0, + "DroppedMessageEventCount": 0, + "DroppedLinkCount": 0, + "ChildSpanCount": 0, + "Resource": null, + "InstrumentationLibrary": { + "Name": "shopify.com/sarama/examples/interceptors", + "Version": "" + } + } +] +[{"SpanContext":{"TraceID":"b3922fbbaab23b16401c353b0ff9ce6b","SpanID":"269f5133c0d0116e","TraceFlags":1},"ParentSpanID":"0000000000000000","SpanKind":1,"Name":"default_topic","StartTime":"2020-08-11T11:36:01.575388-07:00","EndTime":"2020-08-11T11:36:01.575399065-07:00","Attributes":[{"Key":"messaging.destination_kind","Value":{"Type":"STRING","Value":"topic"}},{"Key":"span.otel.kind","Value":{"Type":"STRING","Value":"PRODUCER"}},{"Key":"messaging.system","Value":{"Type":"STRING","Value":"kafka"}},{"Key":"net.transport","Value":{"Type":"STRING","Value":"IP.TCP"}},{"Key":"messaging.url","Value":{"Type":"STRING","Value":"localhost:9092"}},{"Key":"messaging.destination","Value":{"Type":"STRING","Value":"default_topic"}},{"Key":"messaging.message_id","Value":{"Type":"STRING","Value":"269f5133c0d0116e"}}],"MessageEvents":null,"Links":null,"StatusCode":0,"StatusMessage":"","HasRemoteParent":false,"DroppedAttributeCount":0,"DroppedMessageEventCount":0,"DroppedLinkCount":0,"ChildSpanCount":0,"Resource":null,"InstrumentationLibrary":{"Name":"shopify.com/sarama/examples/interceptors","Version":""}}] +[Sarama] 2020/08/11 11:36:01 ClientID is the default of 'sarama', you should consider setting it to something application-specific. +[Sarama] 2020/08/11 11:36:01 producer/broker/1 starting up +[Sarama] 2020/08/11 11:36:01 producer/broker/1 state change to [open] on default_topic/0 +[Sarama] 2020/08/11 11:36:01 Connected to broker at localhost:9092 (registered as #1) +^CINFO[0005] terminating the program +INFO[0005] Bye :) +[Sarama] 2020/08/11 11:36:02 Producer shutting down. +``` + +## Check the produced intercepted messages + +Check that messages have some headers added by the interceptor: +``` sh +kafkacat -Cb localhost:9092 -t default_topic -f '\n- %s\nheaders: %h' +``` + +``` +headers: trace_id=235b3424775d8b2f9bf21e458496f447,span_id=50da1552c105e712,message_id=50da1552c105e712 +- test message 1/2 from kafka-client-go-test at 2020-08-11T11:36:01-07:00 +headers: trace_id=2c4210c1d6c2ebe758eb41cbc95a0478,span_id=046bfc6d6db17ed7,message_id=046bfc6d6db17ed7 +- test message 2/2 from kafka-client-go-test at 2020-08-11T11:36:01-07:00 +% Reached end of topic default_topic [0] at offset 444 +``` diff --git a/examples/interceptors/go.mod b/examples/interceptors/go.mod new file mode 100644 index 000000000..0853479fe --- /dev/null +++ b/examples/interceptors/go.mod @@ -0,0 +1,12 @@ +module github.com/Shopify/sarama/examples/interceptors + +go 1.14 + +replace github.com/Shopify/sarama => ../../ + +require ( + github.com/Shopify/sarama v1.27.0 + go.opentelemetry.io/otel v0.10.0 + go.opentelemetry.io/otel/exporters/stdout v0.10.0 + google.golang.org/genproto v0.0.0-20200331122359-1ee6d9798940 // indirect +) diff --git a/examples/interceptors/go.sum b/examples/interceptors/go.sum new file mode 100644 index 000000000..545d092bc --- /dev/null +++ b/examples/interceptors/go.sum @@ -0,0 +1,161 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 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b/examples/interceptors/interceptors new file mode 100755 index 000000000..176a55293 Binary files /dev/null and b/examples/interceptors/interceptors differ diff --git a/examples/interceptors/main.go b/examples/interceptors/main.go new file mode 100644 index 000000000..4e2254df7 --- /dev/null +++ b/examples/interceptors/main.go @@ -0,0 +1,77 @@ +package main + +import ( + "flag" + "fmt" + "log" + "os" + "os/signal" + "strings" + "time" + + "github.com/Shopify/sarama" + "go.opentelemetry.io/otel/exporters/stdout" +) + +var ( + brokers = flag.String("brokers", "localhost:9092", "The Kafka brokers to connect to, as a comma separated list") + topic = flag.String("topic", "default_topic", "The Kafka topic to use") + logger = log.New(os.Stdout, "[OTelInterceptor] ", log.LstdFlags) +) + +func main() { + flag.Parse() + + if *brokers == "" { + logger.Fatalln("at least one broker is required") + } + splitBrokers := strings.Split(*brokers, ",") + sarama.Logger = log.New(os.Stdout, "[Sarama] ", log.LstdFlags) + + // oTel stdout example + pusher, err := stdout.InstallNewPipeline([]stdout.Option{ + stdout.WithQuantiles([]float64{0.5, 0.9, 0.99}), + }, nil) + if err != nil { + logger.Fatalf("failed to initialize stdout export pipeline: %v", err) + } + defer pusher.Stop() + + // simple sarama producer that adds a new producer interceptor + conf := sarama.NewConfig() + conf.Version = sarama.V0_11_0_0 + conf.Producer.Interceptors = []sarama.ProducerInterceptor{NewOTelInterceptor(splitBrokers)} + + producer, err := sarama.NewAsyncProducer(splitBrokers, conf) + if err != nil { + panic("Couldn't create a Kafka producer") + } + defer producer.AsyncClose() + + // kill -2, trap SIGINT to trigger a shutdown + signals := make(chan os.Signal, 1) + signal.Notify(signals, os.Interrupt) + + // ticker + bulkSize := 2 + duration := 5 * time.Second + ticker := time.NewTicker(duration) + logger.Printf("Starting to produce %v messages every %v", bulkSize, duration) + for { + select { + case t := <-ticker.C: + now := t.Format(time.RFC3339) + logger.Printf("\nproducing %v messages to topic %s at %s", bulkSize, *topic, now) + for i := 0; i < bulkSize; i++ { + producer.Input() <- &sarama.ProducerMessage{ + Topic: *topic, Key: nil, + Value: sarama.StringEncoder(fmt.Sprintf("test message %v/%v from kafka-client-go-test at %s", i+1, bulkSize, now)), + } + } + case <-signals: + logger.Println("terminating the program") + logger.Println("Bye :)") + return + } + } +} diff --git a/examples/interceptors/trace_interceptor.go b/examples/interceptors/trace_interceptor.go new file mode 100644 index 000000000..f905113a2 --- /dev/null +++ b/examples/interceptors/trace_interceptor.go @@ -0,0 +1,92 @@ +package main + +import ( + "context" + "strings" + + "github.com/Shopify/sarama" + "go.opentelemetry.io/otel/api/global" + "go.opentelemetry.io/otel/api/kv" + "go.opentelemetry.io/otel/api/trace" +) + +type OTelInterceptor struct { + tracer trace.Tracer + fixedAttrs []kv.KeyValue +} + +// NewOTelInterceptor processes span for intercepted messages and add some +// headers with the span data. +func NewOTelInterceptor(brokers []string) *OTelInterceptor { + oi := OTelInterceptor{} + oi.tracer = global.TraceProvider().Tracer("shopify.com/sarama/examples/interceptors") + + // These are based on the spec, which was reachable as of 2020-05-15 + // https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/semantic_conventions/messaging.md + oi.fixedAttrs = []kv.KeyValue{ + kv.String("messaging.destination_kind", "topic"), + kv.String("span.otel.kind", "PRODUCER"), + kv.String("messaging.system", "kafka"), + kv.String("net.transport", "IP.TCP"), + kv.String("messaging.url", strings.Join(brokers, ",")), + } + return &oi +} + +const ( + MessageIDHeaderName = "message_id" + SpanHeaderName = "span_id" + TraceHeaderName = "trace_id" +) + +func shouldIgnoreMsg(msg *sarama.ProducerMessage) bool { + // check message hasn't been here before (retries) + var traceFound, spanFound, msgIDFound bool + for _, h := range msg.Headers { + if string(h.Key) == TraceHeaderName { + traceFound = true + continue + } + if string(h.Key) == SpanHeaderName { + spanFound = true + continue + } + if string(h.Key) == MessageIDHeaderName { + msgIDFound = true + } + } + return traceFound && spanFound && msgIDFound +} + +func (oi *OTelInterceptor) OnSend(msg *sarama.ProducerMessage) { + if shouldIgnoreMsg(msg) { + return + } + _ = oi.tracer.WithSpan(context.TODO(), msg.Topic, + func(ctx context.Context) error { + span := trace.SpanFromContext(ctx) + spanContext := span.SpanContext() + attWithTopic := append( + oi.fixedAttrs, + kv.String("messaging.destination", msg.Topic), + kv.String("messaging.message_id", spanContext.SpanID.String()), + ) + span.SetAttributes(attWithTopic...) + + // remove existing partial tracing headers if exists + noTraceHeaders := msg.Headers[:0] + for _, h := range msg.Headers { + key := string(h.Key) + if key != TraceHeaderName && key != SpanHeaderName && key != MessageIDHeaderName { + noTraceHeaders = append(noTraceHeaders, h) + } + } + traceHeaders := []sarama.RecordHeader{ + {Key: []byte(TraceHeaderName), Value: []byte(spanContext.TraceID.String())}, + {Key: []byte(SpanHeaderName), Value: []byte(spanContext.SpanID.String())}, + {Key: []byte(MessageIDHeaderName), Value: []byte(spanContext.SpanID.String())}, + } + msg.Headers = append(noTraceHeaders, traceHeaders...) + return nil + }) +}