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

94 lines
2.7 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 docker
import (
"fmt"
"path"
"github.com/elastic/beats/filebeat/channel"
"github.com/elastic/beats/filebeat/input"
"github.com/elastic/beats/filebeat/input/log"
"github.com/elastic/beats/libbeat/common"
"github.com/pkg/errors"
)
func init() {
err := input.Register("docker", NewInput)
if err != nil {
panic(err)
}
}
// NewInput creates a new docker input
func NewInput(
cfg *common.Config,
outletFactory channel.Connector,
context input.Context,
) (input.Input, error) {
config := defaultConfig
if err := cfg.Unpack(&config); err != nil {
return nil, errors.Wrap(err, "reading docker input config")
}
// Wrap log input with custom docker settings
if len(config.Containers.IDs) == 0 {
return nil, errors.New("Docker input requires at least one entry under 'containers.ids'")
}
for idx, containerID := range config.Containers.IDs {
cfg.SetString("paths", idx, path.Join(config.Containers.Path, containerID, "*.log"))
}
if err := checkStream(config.Containers.Stream); err != nil {
return nil, err
}
if err := cfg.SetString("docker-json.stream", -1, config.Containers.Stream); err != nil {
return nil, errors.Wrap(err, "update input config")
}
if err := cfg.SetBool("docker-json.partial", -1, config.Partial); err != nil {
return nil, errors.Wrap(err, "update input config")
}
if err := cfg.SetBool("docker-json.cri_flags", -1, config.Partial); err != nil {
return nil, errors.Wrap(err, "update input config")
}
// Add stream to meta to ensure different state per stream
if config.Containers.Stream != "all" {
if context.Meta == nil {
context.Meta = map[string]string{}
}
context.Meta["stream"] = config.Containers.Stream
}
return log.NewInput(cfg, outletFactory, context)
}
func checkStream(val string) error {
for _, s := range []string{"all", "stdout", "stderr"} {
if s == val {
return nil
}
}
return fmt.Errorf("Invalid value for containers.stream: %s, supported values are: all, stdout, stderr", val)
}