youtubebeat/vendor/github.com/elastic/beats/filebeat/input/stdin/input.go

107 lines
2.8 KiB
Go

// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package stdin
import (
"fmt"
"github.com/elastic/beats/filebeat/channel"
"github.com/elastic/beats/filebeat/harvester"
"github.com/elastic/beats/filebeat/input"
"github.com/elastic/beats/filebeat/input/file"
"github.com/elastic/beats/filebeat/input/log"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
)
func init() {
err := input.Register("stdin", NewInput)
if err != nil {
panic(err)
}
}
// Input is an input for stdin
type Input struct {
harvester *log.Harvester
started bool
cfg *common.Config
outlet channel.Outleter
registry *harvester.Registry
}
// NewInput creates a new stdin input
// This input contains one harvester which is reading from stdin
func NewInput(cfg *common.Config, outlet channel.Connector, context input.Context) (input.Input, error) {
out, err := outlet(cfg, context.DynamicFields)
if err != nil {
return nil, err
}
p := &Input{
started: false,
cfg: cfg,
outlet: out,
registry: harvester.NewRegistry(),
}
p.harvester, err = p.createHarvester(file.State{Source: "-"})
if err != nil {
return nil, fmt.Errorf("Error initializing stdin harvester: %v", err)
}
return p, nil
}
// Run runs the input
func (p *Input) Run() {
// Make sure stdin harvester is only started once
if !p.started {
err := p.harvester.Setup()
if err != nil {
logp.Err("Error setting up stdin harvester: %s", err)
return
}
if err = p.registry.Start(p.harvester); err != nil {
logp.Err("Error starting the harvester: %s", err)
}
p.started = true
}
}
// createHarvester creates a new harvester instance from the given state
func (p *Input) createHarvester(state file.State) (*log.Harvester, error) {
// Each harvester gets its own copy of the outlet
h, err := log.NewHarvester(
p.cfg,
state, nil, nil,
func() channel.Outleter {
return p.outlet
},
)
return h, err
}
// Wait waits for completion of the input.
func (p *Input) Wait() {}
// Stop stops the input
func (p *Input) Stop() {
p.outlet.Close()
}