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Update README for receivers

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Thomas Roehl 2021-12-21 18:04:01 +01:00
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receivers/README.md
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This folder contains the receivers for the cc-metric-collector.
# CCMetric receivers
# `metricReceiver.go`
The base class/configuration is located in `metricReceiver.go`.
This folder contains the ReceiveManager and receiver implementations for the cc-metric-collector.
# Receivers
* `natsReceiver.go`: Receives metrics from the Nats transport system in Influx line protocol encoding. The database name is used as subscription subject for the NATS messages. It uses https://github.com/nats-io/nats.go
# Configuration
# Installation
Nothing to do, all receivers are pure Go code
# Receiver configuration
The configuration file for the receivers is a list of configurations. The `type` field in each specifies which receiver to initialize.
```json
"receiver": {
[
{
"type": "nats",
"address": "nats://my-url"
"address": "nats://my-url",
"port" : "4222",
"database": "testcluster"
},
}
]
```
## `nats`
The receiver connects to `address` and `port` and subscribes itself for all messages with topic `database`. The default port is `4222`.
## Type `nats`
```json
{
"type": "nats",
"address": "<nats-URI or hostname>",
"port" : "<portnumber>",
"database": "<subscribe topic>"
}
```
The `nats` receiver subscribes to the topic `database` and listens on `address` and `port` for metrics in the InfluxDB line protocol.
# Contributing own receivers
A receiver contains three functions and is derived from the type `Receiver` (in `metricReceiver.go`):
* `Init(config ReceiverConfig) error`
* `Start() error`
* `Close()`
* `Name() string`
* `SetSink(sink chan ccMetric.CCMetric)`
The data structures should be set up in `Init()` like opening a file or server connection. The `Start()` function should either start a go routine or issue some other asynchronous mechanism for receiving metrics. The `Close()` function should tear down anything created in `Init()`.
Finally, the receiver needs to be registered in the `metric-collector.go`. There is a list of receivers called `Receivers` which is a map (string -> pointer to receiver). Add a new entry with a descriptive name and the new receiver.
Finally, the receiver needs to be registered in the `receiveManager.go`. There is a list of receivers called `AvailableReceivers` which is a map (`receiver_type_string` -> `pointer to Receiver interface`). Add a new entry with a descriptive name and the new receiver.