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/*
* Copyright 2017 NEC Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"context"
"github.com/streadway/amqp"
"log"
"os"
"strings"
)
func failOnError(err error, msg string) {
if err != nil {
log.Fatalf("%s: %s", msg, err)
}
}
func runSubscriber(ctx context.Context, config *Config) {
confDirPath := config.Server.CollectdConfDir
amqpURL := "amqp://" + config.Server.AmqpUser + ":" + config.Server.AmqpPassword + "@" + config.Server.AmqpHost + ":" + config.Server.AmqpPort + "/"
conn, err := amqp.Dial(amqpURL)
failOnError(err, "Failed to connect to RabbitMQ")
defer conn.Close()
ch, err := conn.Channel()
failOnError(err, "Failed to open a channel")
defer ch.Close()
err = ch.ExchangeDeclare(
"collectd-conf", // name
"fanout", // type
false, // durable
false, // auto-deleted
false, // internal
false, // no-wait
nil, // arguments
)
failOnError(err, "Failed to declare an exchange")
q, err := ch.QueueDeclare(
"", // name
false, // durable
false, // delete when unused
true, // exclusive
false, // no-wait
nil, // arguments
)
failOnError(err, "Failed to declare a queue")
err = ch.QueueBind(
q.Name, // queue name
"", // routing key
"collectd-conf", // exchange
false,
nil)
failOnError(err, "Failed to bind a queue")
msgs, err := ch.Consume(
q.Name, // queue
"", // consumer
true, // auto-ack
false, // exclusive
false, // no-local
false, // no-wait
nil, // args
)
failOnError(err, "Failed to register a consumer")
EVENTLOOP:
for {
select {
case <-ctx.Done():
break EVENTLOOP
case d, ok := <-msgs:
if ok {
dataText := strings.SplitN(string(d.Body), "/", 2)
dst, err := os.Create(confDirPath + "/" + dataText[0])
failOnError(err, "File create NG")
defer dst.Close()
dst.Write(([]byte)(dataText[1]))
err = createCollectdConf()
failOnError(err, "collectd conf NG")
log.Printf(" [x] %s", d.Body)
}
}
}
}
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