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modelindexer: introduce go-elasticsearch indexer
Introduce an experimental option to index events using go-elasticsearch, bypassing libbeat.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| // 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 modelindexer | ||
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|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "strconv" | ||
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| "github.com/elastic/go-elasticsearch/v7/esapi" | ||
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| "github.com/elastic/apm-server/elasticsearch" | ||
| ) | ||
|
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| // NOTE(axw) please avoid introducing apm-server specific details to this code; | ||
| // it should eventually be removed, and either contributed to go-elasticsearch | ||
| // or replaced by a new go-elasticsearch bulk indexing implementation. | ||
| // | ||
| // At the time of writing, the go-elasticsearch BulkIndexer implementation | ||
| // sends all items to a channel, and multiple persistent worker goroutines will | ||
| // receive those items and independently fill up their own buffers. Each one | ||
| // will independently flush when their buffer is filled up, or when the flush | ||
| // interval elapses. If there are many workers, then this may lead to sparse | ||
| // bulk requests. | ||
| // | ||
| // We take a different approach, where we fill up one bulk request at a time. | ||
| // When the buffer is filled up, or the flush interval elapses, we start a new | ||
| // goroutine to send the request in the background, with a limit on the number | ||
| // of concurrent bulk requests. This way we can ensure bulk requests have the | ||
| // maximum possible size, based on configuration and throughput. | ||
|
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| type bulkIndexer struct { | ||
| client elasticsearch.Client | ||
| itemsAdded int | ||
| buf bytes.Buffer | ||
| aux []byte | ||
| } | ||
|
|
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| func newBulkIndexer(client elasticsearch.Client) *bulkIndexer { | ||
| return &bulkIndexer{client: client} | ||
| } | ||
|
|
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| // BulkIndexer resets b, ready for a new request. | ||
| func (b *bulkIndexer) Reset() { | ||
| b.itemsAdded = 0 | ||
| b.buf.Reset() | ||
| } | ||
|
|
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| // Added returns the number of buffered items. | ||
| func (b *bulkIndexer) Items() int { | ||
| return b.itemsAdded | ||
| } | ||
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| // Bytes returns the number of buffered bytes. | ||
| func (b *bulkIndexer) Bytes() int { | ||
| return b.buf.Len() | ||
| } | ||
|
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| // Add encodes an item in the buffer. | ||
| func (b *bulkIndexer) Add(item elasticsearch.BulkIndexerItem) error { | ||
| b.writeMeta(item) | ||
| if _, err := b.buf.ReadFrom(item.Body); err != nil { | ||
| return err | ||
| } | ||
| b.buf.WriteRune('\n') | ||
| b.itemsAdded++ | ||
| return nil | ||
| } | ||
|
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| func (b *bulkIndexer) writeMeta(item elasticsearch.BulkIndexerItem) { | ||
| b.buf.WriteRune('{') | ||
| b.aux = strconv.AppendQuote(b.aux, item.Action) | ||
| b.buf.Write(b.aux) | ||
| b.aux = b.aux[:0] | ||
| b.buf.WriteRune(':') | ||
| b.buf.WriteRune('{') | ||
| if item.DocumentID != "" { | ||
| b.buf.WriteString(`"_id":`) | ||
| b.aux = strconv.AppendQuote(b.aux, item.DocumentID) | ||
| b.buf.Write(b.aux) | ||
| b.aux = b.aux[:0] | ||
| } | ||
| if item.Index != "" { | ||
| if item.DocumentID != "" { | ||
| b.buf.WriteRune(',') | ||
| } | ||
| b.buf.WriteString(`"_index":`) | ||
| b.aux = strconv.AppendQuote(b.aux, item.Index) | ||
| b.buf.Write(b.aux) | ||
| b.aux = b.aux[:0] | ||
| } | ||
| b.buf.WriteRune('}') | ||
| b.buf.WriteRune('}') | ||
| b.buf.WriteRune('\n') | ||
| } | ||
|
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| // Flush executes a bulk request if there are any items buffered, and clears out the buffer. | ||
| func (b *bulkIndexer) Flush(ctx context.Context) (elasticsearch.BulkIndexerResponse, error) { | ||
| if b.itemsAdded == 0 { | ||
| return elasticsearch.BulkIndexerResponse{}, nil | ||
| } | ||
|
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| req := esapi.BulkRequest{Body: &b.buf} | ||
| res, err := req.Do(ctx, b.client) | ||
| if err != nil { | ||
| return elasticsearch.BulkIndexerResponse{}, err | ||
| } | ||
| defer res.Body.Close() | ||
| if res.IsError() { | ||
| return elasticsearch.BulkIndexerResponse{}, fmt.Errorf("flush failed: %s", res.String()) | ||
| } | ||
|
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| var resp elasticsearch.BulkIndexerResponse | ||
| if err := json.NewDecoder(res.Body).Decode(&resp); err != nil { | ||
| return resp, err | ||
| } | ||
| return resp, nil | ||
| } |
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