mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-28 23:00:03 +01:00
281 lines
8.3 KiB
Go
281 lines
8.3 KiB
Go
package elasticsearch
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import (
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"bufio"
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"errors"
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"flag"
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"fmt"
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"io"
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"math"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/VictoriaMetrics/metrics"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vlinsert/insertutils"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vlstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bufferedwriter"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/writeconcurrencylimiter"
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)
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var (
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elasticsearchVersion = flag.String("elasticsearch.version", "8.9.0", "Elasticsearch version to report to client")
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)
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// RequestHandler processes Elasticsearch insert requests
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func RequestHandler(path string, w http.ResponseWriter, r *http.Request) bool {
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w.Header().Add("Content-Type", "application/json")
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// This header is needed for Logstash
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w.Header().Set("X-Elastic-Product", "Elasticsearch")
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if strings.HasPrefix(path, "/_ilm/policy") {
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// Return fake response for Elasticsearch ilm request.
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fmt.Fprintf(w, `{}`)
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return true
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}
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if strings.HasPrefix(path, "/_index_template") {
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// Return fake response for Elasticsearch index template request.
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fmt.Fprintf(w, `{}`)
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return true
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}
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if strings.HasPrefix(path, "/_ingest") {
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// Return fake response for Elasticsearch ingest pipeline request.
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// See: https://www.elastic.co/guide/en/elasticsearch/reference/8.8/put-pipeline-api.html
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fmt.Fprintf(w, `{}`)
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return true
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}
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if strings.HasPrefix(path, "/_nodes") {
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// Return fake response for Elasticsearch nodes discovery request.
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// See: https://www.elastic.co/guide/en/elasticsearch/reference/8.8/cluster.html
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fmt.Fprintf(w, `{}`)
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return true
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}
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switch path {
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case "/":
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switch r.Method {
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case http.MethodGet:
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// Return fake response for Elasticsearch ping request.
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// See the latest available version for Elasticsearch at https://github.com/elastic/elasticsearch/releases
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fmt.Fprintf(w, `{
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"version": {
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"number": %q
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}
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}`, *elasticsearchVersion)
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case http.MethodHead:
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// Return empty response for Logstash ping request.
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}
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return true
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case "/_license":
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// Return fake response for Elasticsearch license request.
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fmt.Fprintf(w, `{
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"license": {
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"uid": "cbff45e7-c553-41f7-ae4f-9205eabd80xx",
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"type": "oss",
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"status": "active",
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"expiry_date_in_millis" : 4000000000000
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}
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}`)
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return true
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case "/_bulk":
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startTime := time.Now()
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bulkRequestsTotal.Inc()
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cp, err := insertutils.GetCommonParams(r)
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if err != nil {
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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if err := vlstorage.CanWriteData(); err != nil {
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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lr := logstorage.GetLogRows(cp.StreamFields, cp.IgnoreFields)
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processLogMessage := cp.GetProcessLogMessageFunc(lr)
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isGzip := r.Header.Get("Content-Encoding") == "gzip"
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n, err := readBulkRequest(r.Body, isGzip, cp.TimeField, cp.MsgField, processLogMessage)
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vlstorage.MustAddRows(lr)
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logstorage.PutLogRows(lr)
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if err != nil {
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logger.Warnf("cannot decode log message #%d in /_bulk request: %s, stream fields: %s", n, err, cp.StreamFields)
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return true
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}
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tookMs := time.Since(startTime).Milliseconds()
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bw := bufferedwriter.Get(w)
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defer bufferedwriter.Put(bw)
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WriteBulkResponse(bw, n, tookMs)
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_ = bw.Flush()
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// update bulkRequestDuration only for successfully parsed requests
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// There is no need in updating bulkRequestDuration for request errors,
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// since their timings are usually much smaller than the timing for successful request parsing.
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bulkRequestDuration.UpdateDuration(startTime)
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return true
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default:
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return false
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}
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}
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var (
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bulkRequestsTotal = metrics.NewCounter(`vl_http_requests_total{path="/insert/elasticsearch/_bulk"}`)
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rowsIngestedTotal = metrics.NewCounter(`vl_rows_ingested_total{type="elasticsearch_bulk"}`)
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bulkRequestDuration = metrics.NewHistogram(`vl_http_request_duration_seconds{path="/insert/elasticsearch/_bulk"}`)
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)
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func readBulkRequest(r io.Reader, isGzip bool, timeField, msgField string,
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processLogMessage func(timestamp int64, fields []logstorage.Field),
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) (int, error) {
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// See https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html
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if isGzip {
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zr, err := common.GetGzipReader(r)
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if err != nil {
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return 0, fmt.Errorf("cannot read gzipped _bulk request: %w", err)
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}
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defer common.PutGzipReader(zr)
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r = zr
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}
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wcr := writeconcurrencylimiter.GetReader(r)
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defer writeconcurrencylimiter.PutReader(wcr)
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lb := lineBufferPool.Get()
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defer lineBufferPool.Put(lb)
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lb.B = bytesutil.ResizeNoCopyNoOverallocate(lb.B, insertutils.MaxLineSizeBytes.IntN())
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sc := bufio.NewScanner(wcr)
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sc.Buffer(lb.B, len(lb.B))
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n := 0
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nCheckpoint := 0
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for {
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ok, err := readBulkLine(sc, timeField, msgField, processLogMessage)
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wcr.DecConcurrency()
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if err != nil || !ok {
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rowsIngestedTotal.Add(n - nCheckpoint)
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return n, err
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}
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n++
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if batchSize := n - nCheckpoint; n >= 1000 {
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rowsIngestedTotal.Add(batchSize)
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nCheckpoint = n
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}
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}
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}
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var lineBufferPool bytesutil.ByteBufferPool
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func readBulkLine(sc *bufio.Scanner, timeField, msgField string,
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processLogMessage func(timestamp int64, fields []logstorage.Field),
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) (bool, error) {
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var line []byte
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// Read the command, must be "create" or "index"
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for len(line) == 0 {
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if !sc.Scan() {
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if err := sc.Err(); err != nil {
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if errors.Is(err, bufio.ErrTooLong) {
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return false, fmt.Errorf(`cannot read "create" or "index" command, since its size exceeds -insert.maxLineSizeBytes=%d`,
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insertutils.MaxLineSizeBytes.IntN())
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}
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return false, err
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}
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return false, nil
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}
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line = sc.Bytes()
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}
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lineStr := bytesutil.ToUnsafeString(line)
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if !strings.Contains(lineStr, `"create"`) && !strings.Contains(lineStr, `"index"`) {
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return false, fmt.Errorf(`unexpected command %q; expecting "create" or "index"`, line)
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}
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// Decode log message
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if !sc.Scan() {
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if err := sc.Err(); err != nil {
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if errors.Is(err, bufio.ErrTooLong) {
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return false, fmt.Errorf("cannot read log message, since its size exceeds -insert.maxLineSizeBytes=%d", insertutils.MaxLineSizeBytes.IntN())
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}
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return false, err
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}
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return false, fmt.Errorf(`missing log message after the "create" or "index" command`)
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}
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line = sc.Bytes()
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p := logstorage.GetJSONParser()
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if err := p.ParseLogMessage(line, ""); err != nil {
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return false, fmt.Errorf("cannot parse json-encoded log entry: %w", err)
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}
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ts, err := extractTimestampFromFields(timeField, p.Fields)
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if err != nil {
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return false, fmt.Errorf("cannot parse timestamp: %w", err)
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}
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if ts == 0 {
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ts = time.Now().UnixNano()
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}
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p.RenameField(msgField, "_msg")
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processLogMessage(ts, p.Fields)
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logstorage.PutJSONParser(p)
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return true, nil
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}
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func extractTimestampFromFields(timeField string, fields []logstorage.Field) (int64, error) {
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for i := range fields {
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f := &fields[i]
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if f.Name != timeField {
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continue
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}
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timestamp, err := parseElasticsearchTimestamp(f.Value)
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if err != nil {
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return 0, err
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}
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f.Value = ""
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return timestamp, nil
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}
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return 0, nil
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}
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func parseElasticsearchTimestamp(s string) (int64, error) {
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if s == "0" || s == "" {
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// Special case - zero or empty timestamp must be substituted
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// with the current time by the caller.
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return 0, nil
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}
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if len(s) < len("YYYY-MM-DD") || s[len("YYYY")] != '-' {
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// Try parsing timestamp in milliseconds
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n, err := strconv.ParseInt(s, 10, 64)
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if err != nil {
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return 0, fmt.Errorf("cannot parse timestamp in milliseconds from %q: %w", s, err)
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}
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if n > int64(math.MaxInt64)/1e6 {
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return 0, fmt.Errorf("too big timestamp in milliseconds: %d; mustn't exceed %d", n, int64(math.MaxInt64)/1e6)
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}
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if n < int64(math.MinInt64)/1e6 {
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return 0, fmt.Errorf("too small timestamp in milliseconds: %d; must be bigger than %d", n, int64(math.MinInt64)/1e6)
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}
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n *= 1e6
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return n, nil
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}
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if len(s) == len("YYYY-MM-DD") {
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t, err := time.Parse("2006-01-02", s)
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if err != nil {
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return 0, fmt.Errorf("cannot parse date %q: %w", s, err)
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}
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return t.UnixNano(), nil
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}
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t, err := time.Parse(time.RFC3339, s)
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if err != nil {
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return 0, fmt.Errorf("cannot parse timestamp %q: %w", s, err)
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}
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return t.UnixNano(), nil
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}
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