Dockerfile (#2)

* Ease debugging

* Ease consumption via a Dockerfile and Docker Hub container

Author: paulo-ferraz-oliveira

.dockerignore

@@ -0,0 +1,7 @@
+.eslintrc.yml
+.git
+.gitignore
+.prettierrc
+README.md
+node_modules
+package-lock.json

Dockerfile

@@ -0,0 +1,16 @@
+FROM graphiteapp/graphite-statsd:1.1.10-4
+
+ARG VSN=1.0.0
+
+WORKDIR /etc/service/dogstatsd-2-statsd
+
+# Read /entrypoint to understand why we use run and /etc/service
+RUN set -ex \
+ && sed -i 's/8125/8135/g' /opt/statsd/config/udp.js \
+ && apk add npm git \
+ && git clone --depth 1 --branch $VSN https://github.com/paulo-ferraz-oliveira/dogstatsd-2-statsd.git . \
+ && npm install --omit=dev \
+ && echo -e "#!/bin/bash\n\nexec node index.js" > run \ 
+ && chmod +x run
+ 
+ENTRYPOINT /entrypoint

README.md

@@ -4,26 +4,31 @@ We implement a very basic translation layer for when you're using
 Datadog as a remote sink for your metrics but, e.g. locally you're using
 Graphite.
 
-## Reference
+## References
 
 * Datadog: Datagram Format and Shell Usage:
   * <https://docs.datadoghq.com/developers/dogstatsd/datagram_shell?tab=metrics>
 
 * Stats: StatsD Metric Types:
   * <https://github.com/statsd/statsd/blob/master/docs/metric_types.md>
 
+## Docker
+
+Find a Docker container, created from our [Dockerfile](Dockerfile), at
+[Docker Hub: pauloferrazoliveira/dogstatsd-2-statsd](https://hub.docker.com/repository/docker/pauloferrazoliveira/dogstatsd-2-statsd).
+
 ## Usage
 
 To use for the first time:
 
 ```shell
-npm install
+npm install --omit=dev
 ```
 
 Make sure your 8125 is not bound and then:
 
 ```shell
-node index.js | ./node_modules/bunyan/bin/bunyan
+node index.js
 ```
 
 Now start sending your metrics and watch the logs.
@@ -33,6 +38,18 @@ Now start sending your metrics and watch the logs.
 * local port 8125 is not bound (this is our input)
 * local port 8135 is bound to `statsd` input
 
+## Contributing
+
+First, make sure you have `yarn` installed locally.
+
+Then run
+
+```shell
+npm install
+```
+
+to install dev dependencies.
+
 ## Linting
 
 To lint

index.js

@@ -1,10 +1,7 @@
 import dgram from 'node:dgram'
-import bunyan from 'bunyan'
-
-const log = bunyan.createLogger({ name: 'dogstatsd-2-statsd', level: 'trace' })
 
 function trans(msg) {
-  log.trace(`server got: ${msg}`)
+  console.log(`SRC: ${msg}`)
 
   // Very dumb translation, but hopefully serves _all_ our purposes.
   // Assumes input is correctly formatted as Datadog.
@@ -40,21 +37,23 @@ function trans(msg) {
   if (sampleRate) {
     transMsg += `|@${sampleRate}`
   }
-
-  log.trace(`transformed it as ${transMsg}`)
+  console.log(`DST: ${transMsg}`)
 
   return transMsg
 }
 
 const udpServer = dgram.createSocket('udp4')
 const udpClient = dgram.createSocket('udp4')
+const srcPort = 8125
+const dstPort = 8135
 
 udpServer
   .on('message', (udp) => {
     const msgs = udp.toString().split('\n')
     msgs.forEach((msg) => {
       const transMsg = trans(msg)
-      udpClient.send(transMsg, 8135, 'localhost')
+      udpClient.send(transMsg, dstPort, 'localhost')
     })
   })
-  .bind(8125)
+  .bind(srcPort)
+console.log(`Relaying UDP ${srcPort} to ${dstPort}...`)