minor improvement in rabbit mq executor

builtin/bins/dkron-executor-rabbitmq/README.md

@@ -1,4 +1,26 @@
-### Create a job to send rabbitmq text Message
+### RabbitMQ Executor
+
+#### Executor Configuration
+
+The options names are inherited from the [RabbitMQ Publishers](https://www.rabbitmq.com/docs/publishers)
+
+| Option                | Required | Description                   | Default    |
+|-----------------------|----------|-------------------------------|------------|
+| url                   | yes      | RabbitMQ connection string    | -          |
+| queue.name            | yes      | Queue name to send message to | -          |
+| queue.create          | no       | Create queue if not exists    | false      |
+| queue.durable         | no       | Durable queue                 | false      |
+| queue.auto_delete     | no       | Auto delete queue             | false      |
+| queue.exclusive       | no       | Exclusive queue               | false      |
+| message.content_type  | no       | Message content type          | text/plain |
+| message.delivery_mode | no       | Message delivery mode         | 0          |
+| message.messageId     | no       | Message id                    | ""         |
+| message.body          | yes      | Message body                  | -          |
+| message.base64Body    | yes      | Base64 encoded message body   | -          |
+
+#### Example
+
+```shell
 curl localhost:8080/v1/jobs -XPOST -d '{
   "name": "job1",
   "schedule": "@every 10s",
@@ -15,8 +37,17 @@ curl localhost:8080/v1/jobs -XPOST -d '{
   "concurrency": "allow",
   "executor": "rabbitmq",
   "executor_config": {
-    "url": "amqp://guest:guest@localhost:5672/",
-    "text": "hello world!",
-    "queue": "test"
+  		"url": "amqp://guest:guest@localhost:5672/",
+  		"queue.name": "test",
+  		"queue.create": "true",
+  		"queue.durable": "true",
+  		"queue.auto_delete": "false",
+  		"queue.exclusive": "false",
+  		"message.content_type": "application/json",
+  		"message.delivery_mode": "2",
+  		"message.messageId": "4373732772",
+  		"message.body": "{\"key\":\"value\"}"
   }
 }'
+```
+

builtin/bins/dkron-executor-rabbitmq/rabbitmq.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/base64"
 	"errors"
+	"strconv"
 
 	dkplugin "github.com/distribworks/dkron/v4/plugin"
 	dktypes "github.com/distribworks/dkron/v4/types"
@@ -17,9 +18,16 @@ type RabbitMQ struct {
 // "executor": "rabbitmq",
 //
 //	"executor_config": {
-//	    "url": "amqp://guest:guest@localhost:5672/", // rabbitmq server url
-//	    "text": "hello world!",                  				// or "base64" to send bytes as rabbitmq message
-//	    "queue": "test",             				//
+//			"url": "amqp://guest:guest@localhost:5672/",
+//			"queue.name": "test",
+//			"queue.create": "true",
+//			"queue.durable": "true",
+//			"queue.auto_delete": "false",
+//			"queue.exclusive": "false",
+//			"message.content_type": "application/json",
+//			"message.delivery_mode": "2",
+//			"message.messageId": "4373732772",
+//			"message.body": "{\"key\":\"value\"}"
 //	}
 func (r *RabbitMQ) Execute(args *dktypes.ExecuteRequest, cb dkplugin.StatusHelper) (*dktypes.ExecuteResponse, error) {
 	out, err := r.ExecuteImpl(args, cb)
@@ -32,64 +40,117 @@ func (r *RabbitMQ) Execute(args *dktypes.ExecuteRequest, cb dkplugin.StatusHelpe
 
 // ExecuteImpl do rabbitmq publish
 func (r *RabbitMQ) ExecuteImpl(args *dktypes.ExecuteRequest, cb dkplugin.StatusHelper) ([]byte, error) {
+	// validate config
+	cfg := args.Config
+	if cfg == nil {
+		return nil, errors.New("RabbitMQ config is empty")
+	}
+
+	url := cfg["url"]
+	if url == "" {
+		return nil, errors.New("RabbitMQ url is empty")
+	}
 
-	if args.Config["url"] == "" {
-		return nil, errors.New("url is empty")
+	queueName := cfg["queue.name"]
+	if queueName == "" {
+		return nil, errors.New("RabbitMQ queue name is empty")
 	}
 
-	if args.Config["queue"] == "" {
-		return nil, errors.New("queue is empty")
+	if cfg["message.body"] != "" && args.Config["message.base64"] != "" {
+		return nil, errors.New("RabbitMQ message.body and message.base64 are both set")
 	}
 
-	// broker := "amqp://guest:guest@localhost:5672/"
-	broker := args.Config["url"]
-	conn, err := amqp.Dial(broker)
+	// establish connection
+	conn, err := amqp.Dial(url)
 	if err != nil {
 		return nil, err
 	}
-	defer conn.Close()
-
+	defer func(conn *amqp.Connection) {
+		err := conn.Close()
+		if err != nil {
+			// DO NOTHING
+		}
+	}(conn)
 	ch, err := conn.Channel()
 	if err != nil {
 		return nil, err
 	}
-	defer ch.Close()
-
-	queue := args.Config["queue"]
-	q, err := ch.QueueDeclare(
-		queue, // name
-		false, // durable
-		false, // delete when unused
-		false, // exclusive
-		false, // no-wait
-		nil,   // arguments
-	)
-	if err != nil {
+	defer func(ch *amqp.Channel) {
+		err := ch.Close()
+		if err != nil {
+			// DO NOTHING
+		}
+	}(ch)
+
+	// create queue if necessary
+	if err := createQueueIfNecessary(args.Config, queueName, ch); err != nil {
+		return nil, err
+	}
+
+	// publish message
+	if err = publish(cfg, ch); err != nil {
 		return nil, err
 	}
+	return nil, nil
+}
+
+func createQueueIfNecessary(cfg map[string]string, queue string, ch *amqp.Channel) error {
+	if val, ok := cfg["queue.create"]; !ok || (ok && val == "false") {
+		return nil
+	}
+
+	durable, _ := strconv.ParseBool(cfg["queue.durable"])
+	autoDelete, _ := strconv.ParseBool(cfg["queue.auto_delete"])
+	exclusive, _ := strconv.ParseBool(cfg["queue.exclusive"])
+
+	_, err := ch.QueueDeclare(
+		queue,
+		durable,
+		autoDelete,
+		exclusive,
+		false,
+		nil,
+	)
+
+	return err
+}
+
+func publish(cfg map[string]string, ch *amqp.Channel) error {
 	var body []byte
-	b64, ok := args.Config["base64"]
+	b64, ok := cfg["message.base64Body"]
 	if ok {
 		decoded, err := base64.StdEncoding.DecodeString(b64)
 		if err != nil {
-			return nil, err
+			return err
 		}
 		body = decoded
 	} else {
-		text := args.Config["text"]
-		body = []byte(text)
+		stringBody := cfg["message.body"]
+		body = []byte(stringBody)
 	}
-	err = ch.Publish(
-		"",     // exchange
-		q.Name, // routing key
-		false,  // mandatory
-		false,  // immediate
-		amqp.Publishing{
-			ContentType: "text/plain",
-			Body:        body,
-		})
+
+	contentType := cfg["message.content_type"]
+	if contentType == "" {
+		contentType = "text/plain"
+	}
+	messageId := cfg["message.messageId"]
+	rawDeliveryMode := cfg["message.delivery_mode"]
+	if rawDeliveryMode == "" {
+		rawDeliveryMode = "0"
+	}
+	deliveryMode, err := strconv.ParseUint(rawDeliveryMode, 10, 8)
 	if err != nil {
-		return nil, err
+		return err
 	}
-	return nil, nil
+	return ch.Publish(
+		"",                // exchange
+		cfg["queue.name"], // routing key
+		false,             // mandatory
+		false,             // immediate
+		amqp.Publishing{
+			ContentType:  contentType,
+			Body:         body,
+			MessageId:    messageId,
+			DeliveryMode: uint8(deliveryMode),
+		})
 }