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Add new parser to filestream input: container (elastic#26115)
## What does this PR do? This PR adds support for a new parser named `container`. This is the reader that powers the `container` input behind the scenes. Now it is exposed as a parser. Example configuration for reading container logs with the `filesteam` input: ```yaml type: filestream paths: - /path/to/containers/*/*.log parsers: - container: ~ ``` ### Limitations The PR does not provide feature parity with the `container` input because of the lack of support for separating the states of stdout and strerr streams. It is coming in a follow-up PR. ## Why is it important? It is a step toward supporting reading container logs from every input that supports `parsers` option. (cherry picked from commit e2449af)
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| // 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. | ||
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| package readjson | ||
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| import "fmt" | ||
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| type ContainerFormat uint8 | ||
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| type Stream uint8 | ||
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| const ( | ||
| Auto ContainerFormat = iota + 1 | ||
| CRI | ||
| Docker | ||
| JSONFile | ||
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| All Stream = iota + 1 | ||
| Stdout | ||
| Stderr | ||
| ) | ||
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| var ( | ||
| containerFormats = map[string]ContainerFormat{ | ||
| "auto": Auto, | ||
| "cri": CRI, | ||
| "docker": Docker, | ||
| "json-file": JSONFile, | ||
| } | ||
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| containerStreams = map[string]Stream{ | ||
| "all": All, | ||
| "stdout": Stdout, | ||
| "stderr": Stderr, | ||
| } | ||
| ) | ||
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| type ContainerJSONConfig struct { | ||
| Stream Stream `config:"stream"` | ||
| Format ContainerFormat `config:"format"` | ||
| } | ||
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| func DefaultContainerConfig() ContainerJSONConfig { | ||
| return ContainerJSONConfig{ | ||
| Format: Auto, | ||
| Stream: All, | ||
| } | ||
| } | ||
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| func (f *ContainerFormat) Unpack(v string) error { | ||
| val, ok := containerFormats[v] | ||
| if !ok { | ||
| keys := make([]string, len(containerFormats)) | ||
| i := 0 | ||
| for k := range containerFormats { | ||
| keys[i] = k | ||
| i++ | ||
| } | ||
| return fmt.Errorf("unknown container log format: %s, supported values: %+v", v, keys) | ||
| } | ||
| *f = val | ||
| return nil | ||
| } | ||
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| func (s *Stream) Unpack(v string) error { | ||
| val, ok := containerStreams[v] | ||
| if !ok { | ||
| keys := make([]string, len(containerStreams)) | ||
| i := 0 | ||
| for k := range containerStreams { | ||
| keys[i] = k | ||
| i++ | ||
| } | ||
| return fmt.Errorf("unknown streams: %s, supported values: %+v", v, keys) | ||
| } | ||
| *s = val | ||
| return nil | ||
| } | ||
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| func (s *Stream) String() string { | ||
| for k, v := range containerStreams { | ||
| if v == *s { | ||
| return k | ||
| } | ||
| } | ||
| return "" | ||
| } |