mirror of
https://github.com/openziti/ziti.git
synced 2026-10-13 23:59:53 +00:00
Michael Quigley
127 lines
3.4 KiB
Go
127 lines
3.4 KiB
Go
/*
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Copyright 2019 NetFoundry, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"github.com/michaelquigley/pfxlog"
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"github.com/netfoundry/ziti-fabric/pb/ctrl_pb"
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)
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// HandlerType is used define known handler types
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type HandlerType string
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const (
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// HandlerTypeInfluxDB represents the HandlerTypeInfluxDB reporter
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HandlerTypeInfluxDB HandlerType = "influxdb"
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)
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// Handler represents a sink for metric events
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type Handler interface {
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// AcceptMetrics is called when new metrics become available
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AcceptMetrics(message *ctrl_pb.MetricsMessage)
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}
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// EventController allows for sending metrics to multiple Handlers
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type EventController interface {
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Handler
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// AddHandler adds the given arbitrary handler to the event controller
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AddHandler(handler Handler)
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// RemoveHandler removes the given handler from the event controller
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RemoveHandler(handler Handler)
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// Shutdown stops the event controller
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Shutdown()
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}
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// NewEventController creates a new EventController instance
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func NewEventController(cfg *Config) EventController {
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eventController := &eventControllerImpl{
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changeChan: make(chan eventControllerChange, 1),
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metricChan: make(chan *ctrl_pb.MetricsMessage, 25),
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}
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if cfg != nil && cfg.handlers != nil {
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eventController.handlers = cfg.handlers
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} else {
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eventController.handlers = make(map[Handler]Handler)
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}
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go eventController.run()
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return eventController
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}
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type eventControllerImpl struct {
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changeChan chan eventControllerChange
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metricChan chan *ctrl_pb.MetricsMessage
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handlers map[Handler]Handler
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}
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func (eventController *eventControllerImpl) AcceptMetrics(message *ctrl_pb.MetricsMessage) {
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eventController.metricChan <- message
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}
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func (eventController *eventControllerImpl) AddHandler(handler Handler) {
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eventController.changeChan <- eventControllerChange{handler, addHandler}
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}
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func (eventController *eventControllerImpl) RemoveHandler(handler Handler) {
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eventController.changeChan <- eventControllerChange{handler, removeHandler}
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}
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func (eventController *eventControllerImpl) Shutdown() {
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eventController.changeChan <- eventControllerChange{nil, shutdownEventController}
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}
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func (eventController *eventControllerImpl) run() {
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log := pfxlog.Logger()
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log.Info("started")
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defer log.Errorf("exited")
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running := true
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for running {
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select {
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case change := <-eventController.changeChan:
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if addHandler == change.changeType {
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eventController.handlers[change.handler] = change.handler
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} else if removeHandler == change.changeType {
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delete(eventController.handlers, change.handler)
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} else if shutdownEventController == change.changeType {
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running = false
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}
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case msg := <-eventController.metricChan:
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for _, handler := range eventController.handlers {
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go handler.AcceptMetrics(msg)
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}
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}
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}
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}
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type eventControllerChangeType uint8
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const (
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addHandler = iota
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removeHandler
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shutdownEventController
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)
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type eventControllerChange struct {
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handler Handler
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changeType eventControllerChangeType
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}
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