diff --git a/.env-example b/.env-example index 2adf13d..9c0c46d 100644 --- a/.env-example +++ b/.env-example @@ -1 +1,8 @@ -SLACK_WEBHOOK_URL= + defaultBindAddr=:8080 + defaultMetricsBindAddr=:8081 + defaultGrafanaURL=http://grafana:3000 + defaultGrafanaCredentials=admin:secret + defaultAMQPURI=amqp://guest:guest@rabbitmq:5672/ + defaultAMQPQueue=deployments + defaultKafkaBrokers=kafka:9092 + defaultKafkaTopic=events \ No newline at end of file diff --git a/README.md b/README.md index 43c6aed..0683293 100644 --- a/README.md +++ b/README.md @@ -1,4 +1,4 @@ -# Event-Driven application example +# Event Driven Architecture with Golang (Example) This is an example Event-Driven application written in Go, using [Watermill](https://github.com/ThreeDotsLabs/watermill). @@ -8,7 +8,7 @@ demonstrate working with multiple event streams. ![](https://threedots.tech/media/event-driven-applications/diagram.png) -An example result can look like this: +An example result can look like this: ![](https://threedots.tech/media/event-driven-applications/grafana.png) @@ -21,10 +21,10 @@ webhook URL in `SLACK_WEBHOOK_URL` variable. In addition to the application, the docker-compose environment consists of: -* **Kafka** and **ZooKeeper** -* **RabbitMQ** -* **Grafana** -* **Prometheus** +- **Kafka** and **ZooKeeper** +- **RabbitMQ** +- **Grafana** +- **Prometheus** The whole environment can be run with: diff --git a/app/Dockerfile b/app/Dockerfile new file mode 100644 index 0000000..51ab4ef --- /dev/null +++ b/app/Dockerfile @@ -0,0 +1,18 @@ +# Step 1: Modules caching +FROM golang:1.21.4-alpine3.18 as modules +COPY go.mod go.sum /modules/ +WORKDIR /modules +RUN go mod download + +# Step 2: Builder +FROM golang:1.21.4-alpine3.18 as builder +COPY --from=modules /go/pkg /go/pkg +COPY . /app +WORKDIR /app +RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 \ + go build -tags migrate -o /bin/app ./cmd/app + +# Step 3: Final +FROM scratch +COPY --from=builder /bin/app /app +CMD ["/app"] diff --git a/cmd/main.go b/app/cmd/app/main.go similarity index 53% rename from cmd/main.go rename to app/cmd/app/main.go index 1e0c932..3b953b5 100644 --- a/cmd/main.go +++ b/app/cmd/app/main.go @@ -1,8 +1,10 @@ package main import ( - "github.com/ThreeDotsLabs/event-driven-example/pkg" + "context" + "github.com/ThreeDotsLabs/event-driven-example/config" + "github.com/ThreeDotsLabs/event-driven-example/internal" "github.com/ThreeDotsLabs/watermill" "github.com/ThreeDotsLabs/watermill/components/metrics" "github.com/ThreeDotsLabs/watermill/message" @@ -10,28 +12,41 @@ import ( ) func main() { + // Create a new context and add a cancel function to it. + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + + // Create a new logger. logger := watermill.NewStdLogger(false, false) - config := pkg.LoadConfig() + c := config.LoadConfig() + // Create a new router. router, err := message.NewRouter(message.RouterConfig{}, logger) if err != nil { panic(err) } router.AddMiddleware(middleware.Recoverer) - // Metrics setup - prometheusRegistry, closeMetricsServer := metrics.CreateRegistryAndServeHTTP(config.MetricsBindAddr) + // Create a new Prometheus registry and serve it on the given address. + prometheusRegistry, closeMetricsServer := metrics.CreateRegistryAndServeHTTP(c.MetricsBindAddr) defer closeMetricsServer() metricsBuilder := metrics.NewPrometheusMetricsBuilder(prometheusRegistry, "", "") metricsBuilder.AddPrometheusRouterMetrics(router) - err = pkg.SetupRouter(router, config, logger) + // Setup the router. + r := &internal.Router{ + Router: router, + Logger: logger, + Config: c, + } + err = r.SetupRouter() if err != nil { panic(err) } - err = router.Run() - if err != nil { + // Run the router. + if err := router.Run(ctx); err != nil { panic(err) } + } diff --git a/pkg/config.go b/app/config/config.go similarity index 98% rename from pkg/config.go rename to app/config/config.go index 05ce693..a7d42ba 100644 --- a/pkg/config.go +++ b/app/config/config.go @@ -1,4 +1,4 @@ -package pkg +package config import ( "os" @@ -23,15 +23,15 @@ type Config struct { BindAddr string MetricsBindAddr string + GrafanaURL string + GrafanaCredentials string + AMQPURI string AMQPQueue string KafkaBrokers []string KafkaTopic string - GrafanaURL string - GrafanaCredentials string - SlackWebhookURL string } diff --git a/app/go.mod b/app/go.mod new file mode 100644 index 0000000..f0adf60 --- /dev/null +++ b/app/go.mod @@ -0,0 +1,57 @@ +module github.com/ThreeDotsLabs/event-driven-example + +go 1.21 + +require ( + github.com/ThreeDotsLabs/watermill v1.3.5 + github.com/ThreeDotsLabs/watermill-amqp v1.1.4 + github.com/ThreeDotsLabs/watermill-http v1.1.4 + github.com/ThreeDotsLabs/watermill-kafka/v2 v2.5.0 +) + +require ( + github.com/Shopify/sarama v1.38.0 // indirect + github.com/beorn7/perks v1.0.1 // indirect + github.com/cenkalti/backoff/v3 v3.2.2 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/eapache/go-resiliency v1.3.0 // indirect + github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 // indirect + github.com/eapache/queue v1.1.0 // indirect + github.com/go-chi/chi v4.0.2+incompatible // indirect + github.com/go-chi/chi/v5 v5.0.8 // indirect + github.com/go-chi/render v1.0.1 // indirect + github.com/go-logr/logr v1.2.3 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/golang/snappy v0.0.4 // indirect + github.com/google/uuid v1.3.1 // indirect + github.com/hashicorp/errwrap v1.1.0 // indirect + github.com/hashicorp/go-multierror v1.1.1 // indirect + github.com/hashicorp/go-uuid v1.0.3 // indirect + github.com/jcmturner/aescts/v2 v2.0.0 // indirect + github.com/jcmturner/dnsutils/v2 v2.0.0 // indirect + github.com/jcmturner/gofork v1.7.6 // indirect + github.com/jcmturner/gokrb5/v8 v8.4.3 // indirect + github.com/jcmturner/rpc/v2 v2.0.3 // indirect + github.com/klauspost/compress v1.15.11 // indirect + github.com/lithammer/shortuuid/v3 v3.0.7 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect + github.com/oklog/ulid v1.3.1 // indirect + github.com/pierrec/lz4/v4 v4.1.17 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.14.0 // indirect + github.com/prometheus/client_model v0.3.0 // indirect + github.com/prometheus/common v0.39.0 // indirect + github.com/prometheus/procfs v0.9.0 // indirect + github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect + github.com/sony/gobreaker v0.5.0 // indirect + github.com/streadway/amqp v1.0.0 // indirect + go.opentelemetry.io/contrib/instrumentation/github.com/Shopify/sarama/otelsarama v0.31.0 // indirect + go.opentelemetry.io/otel v1.6.1 // indirect + go.opentelemetry.io/otel/trace v1.6.1 // indirect + golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa // indirect + golang.org/x/net v0.4.0 // indirect + golang.org/x/sys v0.4.0 // indirect + google.golang.org/protobuf v1.28.1 // indirect +) diff --git a/app/go.sum b/app/go.sum new file mode 100644 index 0000000..1616124 --- /dev/null +++ b/app/go.sum @@ -0,0 +1,240 @@ +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Shopify/sarama v1.32.0/go.mod h1:+EmJJKZWVT/faR9RcOxJerP+LId4iWdQPBGLy1Y1Njs= +github.com/Shopify/sarama v1.38.0 h1:Q81EWxDT2Xs7kCaaiDGV30GyNCWd6K1Xmd4k2qpTWE8= +github.com/Shopify/sarama v1.38.0/go.mod h1:djdek3V4gS0N9LZ+OhfuuM6rE1bEKeDffYY8UvsRNyM= +github.com/Shopify/toxiproxy/v2 v2.3.0/go.mod h1:KvQTtB6RjCJY4zqNJn7C7JDFgsG5uoHYDirfUfpIm0c= +github.com/Shopify/toxiproxy/v2 v2.5.0 h1:i4LPT+qrSlKNtQf5QliVjdP08GyAH8+BUIc9gT0eahc= +github.com/Shopify/toxiproxy/v2 v2.5.0/go.mod h1:yhM2epWtAmel9CB8r2+L+PCmhH6yH2pITaPAo7jxJl0= +github.com/ThreeDotsLabs/watermill v1.1.0/go.mod h1:Qd1xNFxolCAHCzcMrm6RnjW0manbvN+DJVWc1MWRFlI= +github.com/ThreeDotsLabs/watermill v1.3.5 h1:50JEPEhMGZQMh08ct0tfO1PsgMOAOhV3zxK2WofkbXg= 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h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18= +golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= +golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8= +golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= +golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= +golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= +golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ= +golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= +golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= +golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= +golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= +google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw= +google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc= +google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w= +google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I= +gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q= +gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= +gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw= +gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/app/internal/router.go b/app/internal/router.go new file mode 100644 index 0000000..ae1151a --- /dev/null +++ b/app/internal/router.go @@ -0,0 +1,198 @@ +package internal + +import ( + "fmt" + "math/rand" + "time" + + "github.com/ThreeDotsLabs/event-driven-example/config" + "github.com/ThreeDotsLabs/event-driven-example/pkg" + "github.com/ThreeDotsLabs/watermill" + "github.com/ThreeDotsLabs/watermill-amqp/pkg/amqp" + "github.com/ThreeDotsLabs/watermill-http/pkg/http" + "github.com/ThreeDotsLabs/watermill-kafka/v2/pkg/kafka" + "github.com/ThreeDotsLabs/watermill/message" +) + +type Router struct { + Router *message.Router + Logger watermill.LoggerAdapter + Config config.Config +} + +// * SetupAmqp creates a new AMQP publisher and subscriber. +func (r *Router) SetupAmqp() (message.Publisher, message.Subscriber, error) { + amqpConfig := amqp.NewDurableQueueConfig(r.Config.AMQPURI) + + amqpPublisher, err := amqp.NewPublisher(amqpConfig, r.Logger) + if err != nil { + return nil, nil, fmt.Errorf("failed to create AMQP publisher: %w", err) + } + + amqpSubscriber, err := amqp.NewSubscriber(amqpConfig, r.Logger) + if err != nil { + return nil, nil, fmt.Errorf("failed to create AMQP subscriber: %w", err) + } + + return amqpPublisher, amqpSubscriber, nil +} + +// * SetupHttpSubscriber creates a new HTTP subscriber. +func (r *Router) SetupHttpSubscriber() (message.Subscriber, error) { + httpConfig := http.SubscriberConfig{ + UnmarshalMessageFunc: http.DefaultUnmarshalMessageFunc, + } + httpSubscriber, err := http.NewSubscriber(r.Config.BindAddr, httpConfig, r.Logger) + if err != nil { + return nil, fmt.Errorf("failed to create HTTP subscriber: %w", err) + } + + return httpSubscriber, nil +} + +// * SetupKafka creates a new Kafka publisher and subscriber. +func (r *Router) SetupKafka() (message.Publisher, message.Subscriber, error) { + kafkaPublisher, err := kafka.NewPublisher( + kafka.PublisherConfig{ + Brokers: r.Config.KafkaBrokers, + Marshaler: kafka.DefaultMarshaler{}, + }, + r.Logger, + ) + if err != nil { + return nil, nil, fmt.Errorf("failed to create Kafka publisher: %w", err) + } + + kafkaSubscriber, err := kafka.NewSubscriber( + kafka.SubscriberConfig{ + Brokers: r.Config.KafkaBrokers, + Unmarshaler: kafka.DefaultMarshaler{}, + OverwriteSaramaConfig: nil, + ConsumerGroup: "events", + }, + r.Logger, + ) + if err != nil { + return nil, nil, fmt.Errorf("failed to create Kafka subscriber: %w", err) + } + + return kafkaPublisher, kafkaSubscriber, nil +} + +// * SetupGrafana creates a new Grafana publisher and subscriber. +func (r *Router) SetupGrafana() (message.Publisher, error) { + grafanaPublisher, err := http.NewPublisher( + http.PublisherConfig{ + MarshalMessageFunc: pkg.GrafanaMarshaller(r.Config.GrafanaCredentials), + }, r.Logger) + if err != nil { + return nil, fmt.Errorf("failed to create Grafana publisher: %w", err) + } + + return grafanaPublisher, nil +} + +func (r *Router) SetupRouter() error { + amqpPublisher, amqpSubscriber, err := r.SetupAmqp() + if err != nil { + return err + } + + httpSubscriber, err := r.SetupHttpSubscriber() + if err != nil { + return err + } + + kafkaPublisher, kafkaSubscriber, err := r.SetupKafka() + if err != nil { + return err + } + + grafanaPublisher, err := r.SetupGrafana() + if err != nil { + return err + } + + r.Router.AddHandler( + "http-to-kafka", + "/", + httpSubscriber, + r.Config.KafkaTopic, + kafkaPublisher, + pkg.GithubWebhookHandler, + ) + + r.Router.AddHandler( + "rabbitmq-to-kafka", + r.Config.AMQPQueue, + amqpSubscriber, + r.Config.KafkaTopic, + kafkaPublisher, + pkg.AMQPHandler, + ) + + r.Router.AddHandler( + "kafka-to-grafana", + r.Config.KafkaTopic, + kafkaSubscriber, + r.Config.GrafanaURL+"/api/annotations", + grafanaPublisher, + pkg.GrafanaHandler, + ) + + if r.Config.SlackWebhookURL != "" { + slackPublisher, err := http.NewPublisher( + http.PublisherConfig{ + MarshalMessageFunc: pkg.SlackMarshaller, + }, r.Logger) + if err != nil { + return err + } + + r.Router.AddHandler( + "kafka-to-slack", + r.Config.KafkaTopic, + kafkaSubscriber, + r.Config.SlackWebhookURL, + slackPublisher, + pkg.SlackHandler, + ) + } + + // * DeploySimulator is a handler that simulates a deployment to a given environment. + stagingDelay := time.Second * time.Duration(rand.Intn(60)+30) + productionDelay := stagingDelay + time.Second*time.Duration(rand.Intn(120)+60) + + r.Router.AddHandler( + "deploy-staging-simulator", + r.Config.KafkaTopic, + kafkaSubscriber, + r.Config.AMQPQueue, + amqpPublisher, + pkg.DeploySimulator{Env: "staging", Delay: stagingDelay}.Handle, + ) + + r.Router.AddHandler( + "deploy-production-simulator", + r.Config.KafkaTopic, + kafkaSubscriber, + r.Config.AMQPQueue, + amqpPublisher, + pkg.DeploySimulator{Env: "production", Delay: productionDelay}.Handle, + ) + + go func() { + httpSub, ok := httpSubscriber.(*http.Subscriber) + if !ok { + panic("invalid subscriber type") + } + + <-r.Router.Running() + err = httpSub.StartHTTPServer() + if err != nil { + panic(err) + } + }() + + return nil +} diff --git a/pkg/amqp.go b/app/pkg/amqp.go similarity index 87% rename from pkg/amqp.go rename to app/pkg/amqp.go index 41755d5..7a95f54 100644 --- a/pkg/amqp.go +++ b/app/pkg/amqp.go @@ -14,7 +14,6 @@ type deploymentPayload struct { Timestamp string `json:"timestamp"` } -// AMQPHandler receives a deployment message over AMQP and translates it into a commitDeployed event. func AMQPHandler(msg *message.Message) ([]*message.Message, error) { payload := deploymentPayload{} err := json.Unmarshal(msg.Payload, &payload) @@ -24,7 +23,7 @@ func AMQPHandler(msg *message.Message) ([]*message.Message, error) { log.Println("Received AMQP message: ", payload) - event := commitDeployed{ + event := CommitDeployed{ ID: payload.CommitID, Env: payload.Env, OccurredOn: payload.Timestamp, diff --git a/pkg/events.go b/app/pkg/events.go similarity index 54% rename from pkg/events.go rename to app/pkg/events.go index 6180acd..13ef963 100644 --- a/pkg/events.go +++ b/app/pkg/events.go @@ -1,13 +1,15 @@ package pkg -type commitPushed struct { +// * CommitPushed is the event that is sent when a commit is pushed to GitHub +type CommitPushed struct { ID string `json:"id"` Message string `json:"message"` Author string `json:"author"` OccurredOn string `json:"occurred_on"` } -type commitDeployed struct { +// * CommitDeployed is the event that is sent when a commit is deployed to an environment +type CommitDeployed struct { ID string `json:"id"` Env string `json:"env"` OccurredOn string `json:"occurred_on"` diff --git a/pkg/github.go b/app/pkg/github.go similarity index 80% rename from pkg/github.go rename to app/pkg/github.go index b85f6c4..eecd1c3 100644 --- a/pkg/github.go +++ b/app/pkg/github.go @@ -8,8 +8,7 @@ import ( "github.com/ThreeDotsLabs/watermill/message" ) -// githubPushEvent represents a part of GitHub PushEvent webhook. -// See: https://developer.github.com/v3/activity/events/types/#pushevent +// * CommitPushed is the event that is sent when a commit is pushed to GitHub type githubPushEvent struct { Commits []struct { ID string `json:"id"` @@ -21,7 +20,7 @@ type githubPushEvent struct { } `json:"commits"` } -// GithubWebhookHandler receives GitHub webhooks and translates each commit details into a commitPushed event. +// * GithubWebhookHandler handles GitHub webhook events func GithubWebhookHandler(msg *message.Message) ([]*message.Message, error) { pushEvent := githubPushEvent{} err := json.Unmarshal(msg.Payload, &pushEvent) @@ -33,7 +32,7 @@ func GithubWebhookHandler(msg *message.Message) ([]*message.Message, error) { var messages []*message.Message for _, commit := range pushEvent.Commits { - event := commitPushed{ + event := CommitPushed{ ID: commit.ID, Message: commit.Message, Author: commit.Author.Name, diff --git a/pkg/grafana.go b/app/pkg/grafana.go similarity index 88% rename from pkg/grafana.go rename to app/pkg/grafana.go index cb742e8..a773ed2 100644 --- a/pkg/grafana.go +++ b/app/pkg/grafana.go @@ -10,11 +10,10 @@ import ( "time" "github.com/ThreeDotsLabs/watermill" + "github.com/ThreeDotsLabs/watermill-http/pkg/http" "github.com/ThreeDotsLabs/watermill/message" - "github.com/ThreeDotsLabs/watermill/message/infrastructure/http" ) -// See: http://docs.grafana.org/http_api/annotations/#create-annotation type grafanaAnnotationsPayload struct { Text string `json:"text"` Tags []string `json:"tags"` @@ -28,6 +27,7 @@ type grafanaParams struct { Tags []string } +// * GrafanaMarshaller creates a new HTTP marshaller for Grafana func GrafanaMarshaller(credentials string) http.MarshalMessageFunc { return func(url string, msg *message.Message) (*stdHttp.Request, error) { req, err := stdHttp.NewRequest(stdHttp.MethodPost, url, bytes.NewBuffer(msg.Payload)) @@ -44,7 +44,7 @@ func GrafanaMarshaller(credentials string) http.MarshalMessageFunc { } } -// GrafanaHandler receives an event and translates it into an annotation payload compatible with Grafana REST API. +// * GrafanaHandler creates a new handler for Grafana func GrafanaHandler(msg *message.Message) ([]*message.Message, error) { eventType := msg.Metadata.Get("event_type") params, err := grafanaParamsByType(eventType, msg.Payload) @@ -77,10 +77,11 @@ func GrafanaHandler(msg *message.Message) ([]*message.Message, error) { return []*message.Message{m}, nil } +// * grafanaParamsByType returns Grafana parameters by event type func grafanaParamsByType(eventType string, payload []byte) (grafanaParams, error) { switch eventType { case "commitPushed": - event := commitPushed{} + event := CommitPushed{} err := json.Unmarshal(payload, &event) if err != nil { return grafanaParams{}, err @@ -92,7 +93,7 @@ func grafanaParamsByType(eventType string, payload []byte) (grafanaParams, error Tags: []string{"pushed"}, }, nil case "commitDeployed": - event := commitDeployed{} + event := CommitDeployed{} err := json.Unmarshal(payload, &event) if err != nil { return grafanaParams{}, err diff --git a/pkg/simulator.go b/app/pkg/simulator.go similarity index 82% rename from pkg/simulator.go rename to app/pkg/simulator.go index 799085f..d5436b0 100644 --- a/pkg/simulator.go +++ b/app/pkg/simulator.go @@ -9,19 +9,19 @@ import ( "github.com/ThreeDotsLabs/watermill/message" ) -// DeploySimulator simulates deployment messages for each commitPushed event. +// * DeploySimulator simulates deployment messages for each commitPushed event. type DeploySimulator struct { Env string Delay time.Duration } -// Handle receives a commitPushed event, waits for chosen duration and produces a commitDeployed event. +// * Handle receives a commitPushed event, waits for chosen duration and produces a commitDeployed event. func (d DeploySimulator) Handle(msg *message.Message) ([]*message.Message, error) { if msg.Metadata.Get("event_type") != "commitPushed" { return nil, nil } - event := commitPushed{} + event := CommitPushed{} err := json.Unmarshal(msg.Payload, &event) if err != nil { return nil, err diff --git a/pkg/slack.go b/app/pkg/slack.go similarity index 80% rename from pkg/slack.go rename to app/pkg/slack.go index dd95b61..470b8ad 100644 --- a/pkg/slack.go +++ b/app/pkg/slack.go @@ -11,11 +11,12 @@ import ( "github.com/ThreeDotsLabs/watermill/message" ) -// See: https://api.slack.com/incoming-webhooks +// * CommitPushed represents a commit pushed event. type slackMessagePayload struct { Text string `json:"text"` } +// * SlackMarshaller creates a new HTTP request with a JSON payload. func SlackMarshaller(url string, msg *message.Message) (*http.Request, error) { req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(msg.Payload)) if err != nil { @@ -27,10 +28,13 @@ func SlackMarshaller(url string, msg *message.Message) (*http.Request, error) { return req, nil } -// SlackHandler receives an event and translates it into a message payload compatible with Slack REST API. +// * SlackHandler receives an event and translates it into a message payload compatible with Slack REST API. func SlackHandler(msg *message.Message) ([]*message.Message, error) { eventType := msg.Metadata.Get("event_type") text, err := slackTextByType(eventType, msg.Payload) + if err != nil { + return nil, err + } payload := slackMessagePayload{ Text: text, @@ -47,10 +51,11 @@ func SlackHandler(msg *message.Message) ([]*message.Message, error) { return []*message.Message{m}, nil } +// * slackTextByType returns a text message for a given event type. func slackTextByType(eventType string, payload []byte) (string, error) { switch eventType { case "commitPushed": - event := commitPushed{} + event := CommitPushed{} err := json.Unmarshal(payload, &event) if err != nil { return "", err @@ -60,7 +65,7 @@ func slackTextByType(eventType string, payload []byte) (string, error) { event.ID, event.Author, event.Message) return text, nil case "commitDeployed": - event := commitDeployed{} + event := CommitDeployed{} err := json.Unmarshal(payload, &event) if err != nil { return "", err diff --git a/docker-compose.yml b/docker-compose.yml index c8e2052..3e384ef 100644 --- a/docker-compose.yml +++ b/docker-compose.yml @@ -1,17 +1,15 @@ version: '3' services: app: - image: golang:1.11 + build: ./app restart: on-failure ports: - 8080:8080 - volumes: - - .:/app - - $GOPATH/pkg/mod:/go/pkg/mod - working_dir: /app - command: bash -c "./scripts/wait.sh kafka:9092 rabbitmq:5672 grafana:3000 && go run ./cmd" env_file: - .env + depends_on: + - kafka + - rabbitmq grafana: image: grafana/grafana @@ -46,10 +44,10 @@ services: KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181 KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092 KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1 - KAFKA_AUTO_CREATE_TOPICS_ENABLE: "true" + KAFKA_AUTO_CREATE_TOPICS_ENABLE: 'true' rabbitmq: - image: rabbitmq:3.7 + image: rabbitmq:latest restart: on-failure ports: - 5672:5672 @@ -60,7 +58,7 @@ services: image: prom/prometheus restart: on-failure volumes: - - ./metrics/prometheus.yml:/etc/prometheus/prometheus.yml + - ./metrics/prometheus.yml:/etc/prometheus/prometheus.yml logging: driver: none diff --git a/go.mod b/go.mod deleted file mode 100644 index 79130d9..0000000 --- a/go.mod +++ /dev/null @@ -1,10 +0,0 @@ -module github.com/ThreeDotsLabs/event-driven-example - -require ( - github.com/DataDog/zstd v1.3.5 // indirect - github.com/Shopify/toxiproxy v2.1.4+incompatible // indirect - github.com/ThreeDotsLabs/watermill v0.3.0 - github.com/go-chi/chi v4.0.1+incompatible // indirect - github.com/golang/snappy v0.0.1 // indirect - github.com/streadway/amqp v0.0.0-20190214183023-884228600bc9 // indirect -) diff --git a/go.sum b/go.sum deleted file mode 100644 index 7ecfb08..0000000 --- a/go.sum +++ /dev/null @@ -1,240 +0,0 @@ -cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.35.1/go.mod h1:wfjPZNvXCBYESy3fIynybskMP48KVPrjSPCnXiK7Prg= -dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU= -dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU= -dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4= -dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU= -git.apache.org/thrift.git 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"name": null, + "show": true, + "values": [] + }, + "yaxes": [ + { + "format": "short", + "label": null, + "logBase": 1, + "max": null, + "min": null, + "show": true + }, + { + "format": "short", + "label": null, + "logBase": 1, + "max": null, + "min": null, + "show": true + } + ], + "yaxis": { + "align": false, + "alignLevel": null + } + } + ], + "schemaVersion": 16, + "style": "dark", + "tags": [], + "templating": { + "list": [] + }, + "time": { + "from": "now-3h", + "to": "now" + }, + "timepicker": { + "refresh_intervals": ["5s", "10s", "30s", "1m", "5m", "15m", "30m", "1h", "2h", "1d"], + "time_options": ["5m", "15m", "1h", "6h", "12h", "24h", "2d", "7d", "30d"] + }, + "timezone": "", + "title": "Webhooks", + "uid": "webhooks", + "version": 4 } diff --git a/metrics/grafana/provisioning/default.yml b/metrics/grafana/provisioning/default.yml index 3a6d23a..f6a0df2 100644 --- a/metrics/grafana/provisioning/default.yml +++ b/metrics/grafana/provisioning/default.yml @@ -1,10 +1,10 @@ apiVersion: 1 providers: -- name: 'default' - orgId: 1 - folder: '' - type: file - disableDeletion: false - options: - path: /var/lib/grafana/dashboards + - name: 'default' + orgId: 1 + folder: '' + type: file + disableDeletion: false + options: + path: /var/lib/grafana/dashboards diff --git a/metrics/prometheus.yml b/metrics/prometheus.yml index 1d7ae43..c5c33b8 100644 --- a/metrics/prometheus.yml +++ b/metrics/prometheus.yml @@ -1,9 +1,9 @@ global: - scrape_interval: 15s + scrape_interval: 15s evaluation_interval: 15s scrape_configs: - job_name: 'metrics' static_configs: - - targets: - - 'app:8081' + - targets: + - 'app:8081' diff --git a/pkg/router.go b/pkg/router.go deleted file mode 100644 index 5eb9a64..0000000 --- a/pkg/router.go +++ /dev/null @@ -1,141 +0,0 @@ -package pkg - -import ( - "math/rand" - "time" - - "github.com/ThreeDotsLabs/watermill" - "github.com/ThreeDotsLabs/watermill/message" - "github.com/ThreeDotsLabs/watermill/message/infrastructure/amqp" - "github.com/ThreeDotsLabs/watermill/message/infrastructure/http" - "github.com/ThreeDotsLabs/watermill/message/infrastructure/kafka" -) - -func SetupRouter(router *message.Router, c Config, logger watermill.LoggerAdapter) error { - amqpPublisher, err := amqp.NewPublisher(amqp.NewDurableQueueConfig(c.AMQPURI), logger) - if err != nil { - return err - } - - amqpConfig := amqp.NewDurableQueueConfig(c.AMQPURI) - amqpSubscriber, err := amqp.NewSubscriber(amqpConfig, logger) - if err != nil { - return err - } - - httpConfig := http.SubscriberConfig{ - UnmarshalMessageFunc: http.DefaultUnmarshalMessageFunc, - } - httpSubscriber, err := http.NewSubscriber(c.BindAddr, httpConfig, logger) - if err != nil { - return err - } - - kafkaPublisher, err := kafka.NewPublisher( - c.KafkaBrokers, - kafka.DefaultMarshaler{}, - nil, - logger) - if err != nil { - return err - } - - kafkaConfig := kafka.SubscriberConfig{ - Brokers: c.KafkaBrokers, - } - kafkaSubscriber, err := kafka.NewSubscriber( - kafkaConfig, - nil, - kafka.DefaultMarshaler{}, - logger) - if err != nil { - return err - } - - grafanaPublisher, err := http.NewPublisher( - http.PublisherConfig{ - MarshalMessageFunc: GrafanaMarshaller(c.GrafanaCredentials), - }, logger) - if err != nil { - return err - } - - router.AddHandler( - "http-to-kafka", - "/", - httpSubscriber, - c.KafkaTopic, - kafkaPublisher, - GithubWebhookHandler, - ) - - router.AddHandler( - "rabbitmq-to-kafka", - c.AMQPQueue, - amqpSubscriber, - c.KafkaTopic, - kafkaPublisher, - AMQPHandler, - ) - - router.AddHandler( - "kafka-to-grafana", - c.KafkaTopic, - kafkaSubscriber, - c.GrafanaURL+"/api/annotations", - grafanaPublisher, - GrafanaHandler, - ) - - if c.SlackWebhookURL != "" { - slackPublisher, err := http.NewPublisher( - http.PublisherConfig{ - MarshalMessageFunc: SlackMarshaller, - }, logger) - if err != nil { - return err - } - - router.AddHandler( - "kafka-to-slack", - c.KafkaTopic, - kafkaSubscriber, - c.SlackWebhookURL, - slackPublisher, - SlackHandler, - ) - } - - // Simulate commit deploys with delays - stagingDelay := time.Second * time.Duration(rand.Intn(60)+30) - productionDelay := stagingDelay + time.Second*time.Duration(rand.Intn(120)+60) - - router.AddHandler( - "deploy-staging-simulator", - c.KafkaTopic, - kafkaSubscriber, - c.AMQPQueue, - amqpPublisher, - DeploySimulator{"staging", stagingDelay}.Handle, - ) - - router.AddHandler( - "deploy-production-simulator", - c.KafkaTopic, - kafkaSubscriber, - c.AMQPQueue, - amqpPublisher, - DeploySimulator{"production", productionDelay}.Handle, - ) - - go func() { - // Start HTTP server only after the router is running - <-router.Running() - err = httpSubscriber.StartHTTPServer() - if err != nil { - panic(err) - } - }() - - return nil -} \ No newline at end of file diff --git a/scripts/send-stub-webhook.sh b/scripts/send-stub-webhook.sh old mode 100755 new mode 100644 index 035bca9..d9f6b6e --- a/scripts/send-stub-webhook.sh +++ b/scripts/send-stub-webhook.sh @@ -17,4 +17,4 @@ cat >"$payload" <&2; fi } - -usage() -{ - cat << USAGE >&2 -Usage: - $WAITFORIT_cmdname host:port [-s] [-t timeout] [-- command args] - -h HOST | --host=HOST Host or IP under test - -p PORT | --port=PORT TCP port under test - Alternatively, you specify the host and port as host:port - -s | --strict Only execute subcommand if the test succeeds - -q | --quiet Don't output any status messages - -t TIMEOUT | --timeout=TIMEOUT - Timeout in seconds, zero for no timeout - -- COMMAND ARGS Execute command with args after the test finishes -USAGE - exit 1 -} - -wait_for() -{ - if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then - echoerr "$WAITFORIT_cmdname: waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT" - else - echoerr "$WAITFORIT_cmdname: waiting for $WAITFORIT_HOST:$WAITFORIT_PORT without a timeout" - fi - WAITFORIT_start_ts=$(date +%s) - while : - do - if [[ $WAITFORIT_ISBUSY -eq 1 ]]; then - nc -z $WAITFORIT_HOST $WAITFORIT_PORT - WAITFORIT_result=$? - else - (echo > /dev/tcp/$WAITFORIT_HOST/$WAITFORIT_PORT) >/dev/null 2>&1 - WAITFORIT_result=$? - fi - if [[ $WAITFORIT_result -eq 0 ]]; then - WAITFORIT_end_ts=$(date +%s) - echoerr "$WAITFORIT_cmdname: $WAITFORIT_HOST:$WAITFORIT_PORT is available after $((WAITFORIT_end_ts - WAITFORIT_start_ts)) seconds" - break - fi - sleep 1 - done - return $WAITFORIT_result -} - -wait_for_wrapper() -{ - # In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692 - if [[ $WAITFORIT_QUIET -eq 1 ]]; then - timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --quiet --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT & - else - timeout $WAITFORIT_BUSYTIMEFLAG $WAITFORIT_TIMEOUT $0 --child --host=$WAITFORIT_HOST --port=$WAITFORIT_PORT --timeout=$WAITFORIT_TIMEOUT & - fi - WAITFORIT_PID=$! - trap "kill -INT -$WAITFORIT_PID" INT - wait $WAITFORIT_PID - WAITFORIT_RESULT=$? - if [[ $WAITFORIT_RESULT -ne 0 ]]; then - echoerr "$WAITFORIT_cmdname: timeout occurred after waiting $WAITFORIT_TIMEOUT seconds for $WAITFORIT_HOST:$WAITFORIT_PORT" - fi - return $WAITFORIT_RESULT -} - -# process arguments -while [[ $# -gt 0 ]] -do - case "$1" in - *:* ) - WAITFORIT_hostport=(${1//:/ }) - WAITFORIT_HOST=${WAITFORIT_hostport[0]} - WAITFORIT_PORT=${WAITFORIT_hostport[1]} - shift 1 - ;; - --child) - WAITFORIT_CHILD=1 - shift 1 - ;; - -q | --quiet) - WAITFORIT_QUIET=1 - shift 1 - ;; - -s | --strict) - WAITFORIT_STRICT=1 - shift 1 - ;; - -h) - WAITFORIT_HOST="$2" - if [[ $WAITFORIT_HOST == "" ]]; then break; fi - shift 2 - ;; - --host=*) - WAITFORIT_HOST="${1#*=}" - shift 1 - ;; - -p) - WAITFORIT_PORT="$2" - if [[ $WAITFORIT_PORT == "" ]]; then break; fi - shift 2 - ;; - --port=*) - WAITFORIT_PORT="${1#*=}" - shift 1 - ;; - -t) - WAITFORIT_TIMEOUT="$2" - if [[ $WAITFORIT_TIMEOUT == "" ]]; then break; fi - shift 2 - ;; - --timeout=*) - WAITFORIT_TIMEOUT="${1#*=}" - shift 1 - ;; - --) - shift - WAITFORIT_CLI=("$@") - break - ;; - --help) - usage - ;; - *) - echoerr "Unknown argument: $1" - usage - ;; - esac -done - -if [[ "$WAITFORIT_HOST" == "" || "$WAITFORIT_PORT" == "" ]]; then - echoerr "Error: you need to provide a host and port to test." - usage -fi - -WAITFORIT_TIMEOUT=${WAITFORIT_TIMEOUT:-15} -WAITFORIT_STRICT=${WAITFORIT_STRICT:-0} -WAITFORIT_CHILD=${WAITFORIT_CHILD:-0} -WAITFORIT_QUIET=${WAITFORIT_QUIET:-0} - -# check to see if timeout is from busybox? -WAITFORIT_TIMEOUT_PATH=$(type -p timeout) -WAITFORIT_TIMEOUT_PATH=$(realpath $WAITFORIT_TIMEOUT_PATH 2>/dev/null || readlink -f $WAITFORIT_TIMEOUT_PATH) -if [[ $WAITFORIT_TIMEOUT_PATH =~ "busybox" ]]; then - WAITFORIT_ISBUSY=1 - WAITFORIT_BUSYTIMEFLAG="-t" - -else - WAITFORIT_ISBUSY=0 - WAITFORIT_BUSYTIMEFLAG="" -fi - -if [[ $WAITFORIT_CHILD -gt 0 ]]; then - wait_for - WAITFORIT_RESULT=$? - exit $WAITFORIT_RESULT -else - if [[ $WAITFORIT_TIMEOUT -gt 0 ]]; then - wait_for_wrapper - WAITFORIT_RESULT=$? - else - wait_for - WAITFORIT_RESULT=$? - fi -fi - -if [[ $WAITFORIT_CLI != "" ]]; then - if [[ $WAITFORIT_RESULT -ne 0 && $WAITFORIT_STRICT -eq 1 ]]; then - echoerr "$WAITFORIT_cmdname: strict mode, refusing to execute subprocess" - exit $WAITFORIT_RESULT - fi - exec "${WAITFORIT_CLI[@]}" -else - exit $WAITFORIT_RESULT -fi diff --git a/scripts/wait.sh b/scripts/wait.sh deleted file mode 100755 index 7369ac2..0000000 --- a/scripts/wait.sh +++ /dev/null @@ -1,6 +0,0 @@ -#!/bin/bash -set -e - -for service in "$@"; do - "$(dirname "$0")/wait-for-it.sh" -t 30 "$service" -done