118 lines
2.8 KiB
Go
118 lines
2.8 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package harvester
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import (
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"errors"
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"sync"
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"github.com/gofrs/uuid"
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"github.com/elastic/beats/libbeat/logp"
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)
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// Registry struct manages (start / stop) a list of harvesters
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type Registry struct {
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sync.RWMutex
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harvesters map[uuid.UUID]Harvester
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wg sync.WaitGroup
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done chan struct{}
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}
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// NewRegistry creates a new registry object
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func NewRegistry() *Registry {
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return &Registry{
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harvesters: map[uuid.UUID]Harvester{},
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done: make(chan struct{}),
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}
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}
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func (r *Registry) remove(h Harvester) {
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r.Lock()
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defer r.Unlock()
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delete(r.harvesters, h.ID())
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}
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// Stop stops all harvesters in the registry
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func (r *Registry) Stop() {
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r.Lock()
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defer func() {
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r.Unlock()
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r.WaitForCompletion()
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}()
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// Makes sure no new harvesters are added during stopping
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close(r.done)
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for _, hv := range r.harvesters {
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go func(h Harvester) {
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h.Stop()
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}(hv)
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}
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}
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// WaitForCompletion can be used to wait until all harvesters are stopped
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func (r *Registry) WaitForCompletion() {
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r.wg.Wait()
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}
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// Start starts the given harvester and add its to the registry
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func (r *Registry) Start(h Harvester) error {
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// Make sure stop is not called during starting a harvester
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r.Lock()
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defer r.Unlock()
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// Make sure no new harvesters are started after stop was called
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if !r.active() {
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return errors.New("registry already stopped")
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}
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r.wg.Add(1)
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// Add the harvester to the registry and share the lock with stop making sure Start() and Stop()
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// have a consistent view of the harvesters.
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r.harvesters[h.ID()] = h
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go func() {
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defer func() {
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r.remove(h)
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r.wg.Done()
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}()
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// Starts harvester and picks the right type. In case type is not set, set it to default (log)
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err := h.Run()
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if err != nil {
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logp.Err("Error running input: %v", err)
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}
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}()
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return nil
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}
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// Len returns the current number of harvesters in the registry
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func (r *Registry) Len() uint64 {
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r.RLock()
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defer r.RUnlock()
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return uint64(len(r.harvesters))
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}
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func (r *Registry) active() bool {
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select {
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case <-r.done:
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return false
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default:
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return true
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}
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}
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