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Updated contributing section for sinks

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Thomas Roehl 2021-11-26 15:56:52 +01:00
parent 09e15c9949
commit 325d97df96
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sinks/README.md
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@ -12,18 +12,6 @@ The base class/configuration is located in `metricSink.go`.
# Installation # Installation
Nothing to do, all sinks are pure Go code Nothing to do, all sinks are pure Go code
# Contributing own sinks
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. 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 (sink_type_string -> pointer to sink). Add a new entry with a descriptive name and the new sink.
# Sink configuration # Sink configuration
```json ```json
@ -63,3 +51,15 @@ The InfluxDB sink uses blocking write operations to write to an InfluxDB databas
* `port`: Portnumber (as string) 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>` * `database`: Endpoint to write to. HTTP POST requests are performed on `http://<host>:<port>/<database>`
* `password`: JSON Web token used for authentification * `password`: JSON Web token used for authentification
# Contributing own sinks
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. 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 (sink_type_string -> pointer to sink). Add a new entry with a descriptive name and the new sink.