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Update sink README and SampleSink

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Thomas Roehl 2022-02-22 16:19:46 +01:00
parent 18a226183c
commit 24e12ccc57
1 changed files with 15 additions and 4 deletions
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19
sinks/README.md
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@ -6,6 +6,7 @@ This folder contains the SinkManager and sink implementations for the cc-metric-
- [`stdout`](./stdoutSink.md): Print all metrics to `stdout`, `stderr` or a file - [`stdout`](./stdoutSink.md): Print all metrics to `stdout`, `stderr` or a file
- [`http`](./httpSink.md): Send metrics to an HTTP server as POST requests - [`http`](./httpSink.md): Send metrics to an HTTP server as POST requests
- [`influxdb`](./influxSink.md): Send metrics to an [InfluxDB](https://www.influxdata.com/products/influxdb/) database - [`influxdb`](./influxSink.md): Send metrics to an [InfluxDB](https://www.influxdata.com/products/influxdb/) database
- [`influxasync`](./influxAsyncSink.md): Send metrics to an [InfluxDB](https://www.influxdata.com/products/influxdb/) database with non-blocking write API
- [`nats`](./natsSink.md): Publish metrics to the [NATS](https://nats.io/) network overlay system - [`nats`](./natsSink.md): Publish metrics to the [NATS](https://nats.io/) network overlay system
- [`ganglia`](./gangliaSink.md): Publish metrics in the [Ganglia Monitoring System](http://ganglia.info/) using the `gmetric` CLI tool - [`ganglia`](./gangliaSink.md): Publish metrics in the [Ganglia Monitoring System](http://ganglia.info/) using the `gmetric` CLI tool
- [`libganglia`](./libgangliaSink.md): Publish metrics in the [Ganglia Monitoring System](http://ganglia.info/) directly using `libganglia.so` - [`libganglia`](./libgangliaSink.md): Publish metrics in the [Ganglia Monitoring System](http://ganglia.info/) directly using `libganglia.so`
@ -34,11 +35,12 @@ The configuration file for the sinks is a list of configurations. The `type` fie
# Contributing own sinks # Contributing own sinks
A sink contains four functions and is derived from the type `sink`: A sink contains five functions and is derived from the type `sink`:
* `Init(config json.RawMessage) error` * `Init(name string, config json.RawMessage) error`
* `Write(point CCMetric) error` * `Write(point CCMetric) error`
* `Flush() error` * `Flush() error`
* `Close()` * `Close()`
* `New<Typename>(name string, config json.RawMessage) (Sink, error)` (calls the `Init()` function)
The data structures should be set up in `Init()` like opening a file or server connection. The `Write()` function 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()`. The data structures should be set up in `Init()` like opening a file or server connection. The `Write()` function 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()`.
@ -65,8 +67,8 @@ type SampleSink struct {
} }
// Initialize the sink by giving it a name and reading in the config JSON // Initialize the sink by giving it a name and reading in the config JSON
func (s *SampleSink) Init(config json.RawMessage) error { func (s *SampleSink) Init(name string, config json.RawMessage) error {
s.name = "SampleSink" // Always specify a name here s.name = fmt.Sprintf("SampleSink(%s)", name) // Always specify a name here
// Read in the config JSON // Read in the config JSON
if len(config) > 0 { if len(config) > 0 {
err := json.Unmarshal(config, &s.config) err := json.Unmarshal(config, &s.config)
@ -91,4 +93,13 @@ func (s *SampleSink) Flush() error {
// Close sink: close network connection, close files, close libraries, ... // Close sink: close network connection, close files, close libraries, ...
func (s *SampleSink) Close() {} func (s *SampleSink) Close() {}
// New function to create a new instance of the sink
func NewSampleSink(name string, config json.RawMessage) (Sink, error) {
s := new(SampleSink)
err := s.Init(name, config)
return s, err
}
``` ```