Push error messages to error topic when NATS mqtrigger fail (#724)

test/tests/mqtrigger/main_error.js

@@ -0,0 +1,6 @@
+module.exports = async function(context) {
+    return {
+        status: 400,
+        body: "Hello, World!"
+    };
+}

test/tests/mqtrigger/test_mqtrigger_error.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+
+#
+# Create a function and trigger it using NATS
+# To run this on Minikube, uncomment line 18
+
+set -euo pipefail
+set +x
+
+ROOT=$(dirname $0)/../..
+DIR=$(dirname $0)
+
+clusterID="fissionMQTrigger"
+topic="foo.bar"
+resptopic="foo.foo"
+errortopic="foo.error"
+maxretries=1
+# FISSION_NATS_STREAMING_URL="http://defaultFissionAuthToken@$(minikube ip):4222"
+expectedRespOutput="[foo.error]: 'Hello, World!'"
+
+log "Pre-test cleanup"
+fission env delete --name nodejs || true
+
+log "Creating nodejs env"
+fission env create --name nodejs --image fission/node-env
+#trap "fission env delete --name nodejs" EXIT
+
+log "Creating function"
+fn=hello-$(date +%s)
+fission fn create --name $fn --env nodejs --code $DIR/main_error.js --method GET
+##trap "fission fn delete --name $fn" EXIT
+
+log "Creating message queue trigger"
+mqt=mqt-$(date +%s)
+fission mqtrigger create --name $mqt --function $fn --mqtype "nats-streaming" --topic $topic --resptopic $resptopic --errortopic $errortopic --maxretries $maxretries
+log "Updated mqtrigger list"
+fission mqtrigger list
+#trap "fission mqtrigger delete --name $mqt" EXIT
+
+# wait until nats trigger is created
+sleep 5
+
+#
+# Send a message
+#
+log "Sending message"
+go run $DIR/stan-pub.go -s $FISSION_NATS_STREAMING_URL -c $clusterID -id clientPub $topic ""
+
+#
+# Wait for message on error topic
+#
+log "Waiting for response"
+TIMEOUT=timeout
+if [ $(uname -s) == 'Darwin' ]
+then
+    # If this fails on mac os, do "brew install coreutils".
+    TIMEOUT=gtimeout
+fi
+response=$(go run $DIR/stan-sub.go --last -s $FISSION_NATS_STREAMING_URL -c $clusterID -id clientSub $errortopic 2>&1)
+
+log "Subscriber received response: $response"
+
+fission mqtrigger delete --name $mqt
+# kubectl delete functions --all
+
+if [[ "$response" != "$expectedRespOutput" ]]; then
+    log "$response is not equal to $expectedRespOutput"
+    exit 1
+else
+    log "Responses match."
+fi