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Update sink README.md

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Thomas Roehl 2021-11-26 14:10:22 +01:00
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@ -16,8 +16,50 @@ Nothing to do, all sinks are pure Go code
A sink contains three functions and is derived from the type `Sink` (in `metricSink.go`):
* `Init(config SinkConfig) error`
* `Write(measurement string, tags map[string]string, fields map[string]interface{}, t time.Time) error`
* `Flush() error`
* `Close()`
The data structures should be set up in `Init()` like opening a file or server connection. The `Write()` function takes a measurement, tags, fields and a timestamp and writes/sends the data. The `Close()` function should tear down anything created in `Init()`.
The data structures should be set up in `Init()` like opening a file or server connection. The `Write()` function takes a measurement, tags, fields and a timestamp and writes/sends the data. For non-blocking sinks, the `Flush()` method tells the sink to drain its internal buffers. The `Close()` function should tear down anything created in `Init()`.
Finally, the sink needs to be registered in the `metric-collector.go`. There is a list of sinks called `Sinks` which is a map (string -> pointer to sink). Add a new entry with a descriptive name and the new sink.
Finally, the sink needs to be registered in the `metric-collector.go`. There is a list of sinks called `Sinks` which is a map (sink_type_string -> pointer to sink). Add a new entry with a descriptive name and the new sink. Afterwards, it can be configured in the main configuration file at `type`:
```json
{
"sink": {
"user": "testuser",
"password": "testpass",
"host": "127.0.0.1",
"port": "9090",
"database": "testdb",
"organization": "testorg",
"ssl": false
"type": "stdout"
}
}
```
# Sink configuration
## `stdoutSink`
When configuring `type = stdout`, all metrics are printed to stdout. No further configuration is required or touched, so you can leave your other-sink-config in there and just change the `type` for debugging purposes
## `influxSink`
The InfluxDB sink uses blocking write operations to write to an InfluxDB database using the v2 API. It uses the following configuration options:
* `host`: Hostname of the database instance
* `port`: Portnumber (as string) of the database
* `database`: Name of the database, called 'bucket' in InfluxDB v2
* `organization`: The InfluxDB v2 API uses organizations to separate database instances running on the same host
* `ssl`: Boolean to activate SSL/TLS
* `user`: Although the v2 API uses API keys instead of username and password, this field can be used if the sink should authentificate with `username:password`. If you want to use an API key, leave this field empty.
* `password`: API key for the InfluxDB v2 API or password if `user` is set
## `natsSink`
* `host`: Hostname of the NATS server
* `port`: Portnumber (as string) of the NATS server
* `user`: Username for authentification in the NATS transport system
* `password`: Password for authentification in the NATS transport system
## `httpSink`
* `host`: Hostname of the HTTP server
* `port`: Portnumber (as string) of the HTTP server
* `database`: Endpoint to write to. HTTP POST requests are performed on `http://<host>:<port>/<database>`
* `password`: JSON Web token used for authentification