108 lines
2.8 KiB
Go
108 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 stdin
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import (
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"fmt"
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"github.com/elastic/beats/filebeat/channel"
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"github.com/elastic/beats/filebeat/harvester"
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"github.com/elastic/beats/filebeat/input"
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"github.com/elastic/beats/filebeat/input/file"
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"github.com/elastic/beats/filebeat/input/log"
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"github.com/elastic/beats/libbeat/common"
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"github.com/elastic/beats/libbeat/logp"
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)
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func init() {
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err := input.Register("stdin", NewInput)
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if err != nil {
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panic(err)
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}
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}
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// Input is an input for stdin
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type Input struct {
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harvester *log.Harvester
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started bool
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cfg *common.Config
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outlet channel.Outleter
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registry *harvester.Registry
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}
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// NewInput creates a new stdin input
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// This input contains one harvester which is reading from stdin
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func NewInput(cfg *common.Config, outlet channel.Connector, context input.Context) (input.Input, error) {
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out, err := outlet(cfg, context.DynamicFields)
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if err != nil {
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return nil, err
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}
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p := &Input{
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started: false,
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cfg: cfg,
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outlet: out,
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registry: harvester.NewRegistry(),
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}
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p.harvester, err = p.createHarvester(file.State{Source: "-"})
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if err != nil {
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return nil, fmt.Errorf("Error initializing stdin harvester: %v", err)
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}
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return p, nil
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}
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// Run runs the input
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func (p *Input) Run() {
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// Make sure stdin harvester is only started once
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if !p.started {
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err := p.harvester.Setup()
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if err != nil {
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logp.Err("Error setting up stdin harvester: %s", err)
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return
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}
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if err = p.registry.Start(p.harvester); err != nil {
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logp.Err("Error starting the harvester: %s", err)
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}
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p.started = true
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}
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}
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// createHarvester creates a new harvester instance from the given state
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func (p *Input) createHarvester(state file.State) (*log.Harvester, error) {
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// Each harvester gets its own copy of the outlet
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h, err := log.NewHarvester(
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p.cfg,
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state, nil, nil,
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func() channel.Outleter {
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return p.outlet
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},
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)
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return h, err
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}
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// Wait waits for completion of the input.
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func (p *Input) Wait() {}
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// Stop stops the input
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func (p *Input) Stop() {
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p.outlet.Close()
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}
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