Nats http connector

nats-http-connector/Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:1.12-alpine as builder
+
+RUN apk add bash ca-certificates git gcc g++ libc-dev
+
+
+RUN mkdir /app
+WORKDIR /app
+COPY go.mod . 
+COPY go.sum .
+
+RUN go mod download
+
+# Copy source code to image
+COPY . .
+
+RUN go build -a -o /go/bin/main
+FROM alpine:3.12 as base
+RUN apk add --update ca-certificates
+COPY --from=builder /go/bin/main /
+
+ENTRYPOINT ["/main"] 

nats-http-connector/README.md

@@ -0,0 +1,13 @@
+NATs KEDA connector image can be used in the Kubernetes deployment as scaleTargetRef in scaledObject of [NATs scaler](https://keda.sh/docs/1.5/scalers/nats-streaming/).
+
+The job of the connector is to read messages from the subject, call an HTTP endpoint with the body of the message, and write response or error in the respective subject. Following enviornment variables are used by connector image as configuration to connect and authenticate with NATs server which should be defined in the Kubernetes deployment manifest.
+
+- `TOPIC`: Subject from which messages are read
+- `HTTP_ENDPOINT`: http endpoint to post request
+- `ERROR_TOPIC`: Subject to write errors on failure.
+- `RESPONSE_TOPIC`: Subject to write responses on success response.
+- `SOURCE_NAME`: Optional. Name of the Source. Default is "KEDAConnector"
+- `MAX_RETRIES`: Maximum number of times an http endpoint will be retried upon failure.
+- `CONTENT_TYPE`: Content type used while creating post request
+- `HOST`: NATs connection string, like `nats://127.0.0.1:4222`
+

nats-http-connector/go.mod

@@ -0,0 +1,12 @@
+module github.com/fission/keda-connectors/rabbitmq
+
+go 1.12
+
+require (
+	github.com/fission/keda-connectors/common v0.0.0-20200809052657-5ab20c06c62f
+	github.com/golang/protobuf v1.4.2 // indirect
+	github.com/nats-io/nats-server/v2 v2.1.8 // indirect
+	github.com/nats-io/nats.go v1.10.0
+	go.uber.org/zap v1.15.0
+	google.golang.org/protobuf v1.25.0 // indirect
+)

nats-http-connector/go.sum

@@ -0,0 +1,134 @@
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nats-http-connector/main.go

@@ -0,0 +1,122 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/nats-io/nats.go"
+	"go.uber.org/zap"
+
+	"github.com/fission/keda-connectors/common"
+)
+
+type natsConnector struct {
+	host          string
+	connectordata common.ConnectorMetadata
+	connection    *nats.Conn
+	logger        *zap.Logger
+}
+
+func (conn natsConnector) consumeMessage() {
+
+	headers := http.Header{
+		"Topic":        {conn.connectordata.Topic},
+		"RespTopic":    {conn.connectordata.ResponseTopic},
+		"ErrorTopic":   {conn.connectordata.ErrorTopic},
+		"Content-Type": {conn.connectordata.ContentType},
+		"Source-Name":  {conn.connectordata.SourceName},
+	}
+	forever := make(chan bool)
+
+	_, err := conn.connection.Subscribe(conn.connectordata.Topic, func(m *nats.Msg) {
+		msg := string(m.Data)
+		conn.logger.Info(msg)
+		resp, err := common.HandleHTTPRequest(msg, headers, conn.connectordata, conn.logger)
+		if err != nil {
+			conn.errorHandler(err)
+		} else {
+			defer resp.Body.Close()
+			body, err := ioutil.ReadAll(resp.Body)
+			if err != nil {
+				conn.errorHandler(err)
+			} else {
+				if success := conn.responseHandler(string(body)); success {
+				}
+			}
+		}
+	})
+
+	if err != nil {
+		conn.logger.Fatal("error occurred while consuming message", zap.Error(err))
+	}
+
+	conn.logger.Info("NATs consumer up and running!...")
+	<-forever
+}
+
+func (conn natsConnector) errorHandler(err error) {
+
+	publishErr := conn.connection.Publish(conn.connectordata.ErrorTopic, []byte(err.Error()))
+
+	if publishErr != nil {
+		conn.logger.Error("failed to publish message to error topic",
+			zap.Error(publishErr),
+			zap.String("source", conn.connectordata.SourceName),
+			zap.String("message", publishErr.Error()),
+			zap.String("topic", conn.connectordata.ErrorTopic))
+	}
+}
+
+func (conn natsConnector) responseHandler(response string) bool {
+
+	if len(conn.connectordata.ResponseTopic) > 0 {
+
+		publishErr := conn.connection.Publish(conn.connectordata.ResponseTopic, []byte(response))
+
+		if publishErr != nil {
+			conn.logger.Error("failed to publish response body from http request to topic",
+				zap.Error(publishErr),
+				zap.String("topic", conn.connectordata.ResponseTopic),
+				zap.String("source", conn.connectordata.SourceName),
+				zap.String("http endpoint", conn.connectordata.HTTPEndpoint),
+			)
+			return false
+		}
+	}
+	return true
+}
+
+func main() {
+	logger, err := zap.NewProduction()
+	if err != nil {
+		log.Fatalf("can't initialize zap logger: %v", err)
+	}
+	defer logger.Sync()
+
+	connectordata, err := common.ParseConnectorMetadata()
+
+	host := os.Getenv("HOST")
+	if os.Getenv("INCLUDE_UNACKED") == "true" {
+		logger.Fatal("only nats protocol host is supported")
+	}
+	if host == "" {
+		logger.Fatal("received empty host field")
+	}
+
+	connection, err := nats.Connect(host)
+
+	if err != nil {
+		logger.Fatal("failed to establish connection with NATS", zap.Error(err))
+	}
+	defer connection.Close()
+
+	conn := natsConnector{
+		host:          host,
+		connection:    connection,
+		connectordata: connectordata,
+		logger:        logger,
+	}
+	conn.consumeMessage()
+}