mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
130 lines
2.9 KiB
Go
130 lines
2.9 KiB
Go
package graphite
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import (
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"fmt"
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"io"
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"net"
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"runtime"
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"sync"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
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"github.com/VictoriaMetrics/metrics"
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)
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// ParseStream parses Graphite lines from r and calls callback for the parsed rows.
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//
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// The callback can be called multiple times for streamed data from r.
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//
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// callback shouldn't hold rows after returning.
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func ParseStream(r io.Reader, callback func(rows []Row) error) error {
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ctx := getStreamContext()
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defer putStreamContext(ctx)
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for ctx.Read(r) {
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if err := callback(ctx.Rows.Rows); err != nil {
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return err
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}
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}
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return ctx.Error()
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}
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const flushTimeout = 3 * time.Second
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func (ctx *streamContext) Read(r io.Reader) bool {
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readCalls.Inc()
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if ctx.err != nil {
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return false
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}
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if c, ok := r.(net.Conn); ok {
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if err := c.SetReadDeadline(time.Now().Add(flushTimeout)); err != nil {
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readErrors.Inc()
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ctx.err = fmt.Errorf("cannot set read deadline: %s", err)
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return false
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}
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}
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ctx.reqBuf, ctx.tailBuf, ctx.err = common.ReadLinesBlock(r, ctx.reqBuf, ctx.tailBuf)
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if ctx.err != nil {
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if ne, ok := ctx.err.(net.Error); ok && ne.Timeout() {
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// Flush the read data on timeout and try reading again.
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ctx.err = nil
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} else {
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if ctx.err != io.EOF {
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readErrors.Inc()
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ctx.err = fmt.Errorf("cannot read graphite plaintext protocol data: %s", ctx.err)
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}
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return false
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}
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}
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ctx.Rows.Unmarshal(bytesutil.ToUnsafeString(ctx.reqBuf))
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rowsRead.Add(len(ctx.Rows.Rows))
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// Fill missing timestamps with the current timestamp rounded to seconds.
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currentTimestamp := time.Now().Unix()
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rows := ctx.Rows.Rows
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for i := range rows {
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r := &rows[i]
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if r.Timestamp == 0 {
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r.Timestamp = currentTimestamp
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}
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}
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// Convert timestamps from seconds to milliseconds.
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for i := range rows {
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rows[i].Timestamp *= 1e3
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}
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return true
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}
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type streamContext struct {
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Rows Rows
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reqBuf []byte
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tailBuf []byte
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err error
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}
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func (ctx *streamContext) Error() error {
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if ctx.err == io.EOF {
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return nil
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}
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return ctx.err
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}
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func (ctx *streamContext) reset() {
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ctx.Rows.Reset()
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ctx.reqBuf = ctx.reqBuf[:0]
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ctx.tailBuf = ctx.tailBuf[:0]
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ctx.err = nil
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}
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var (
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readCalls = metrics.NewCounter(`vm_protoparser_read_calls_total{type="graphite"}`)
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readErrors = metrics.NewCounter(`vm_protoparser_read_errors_total{type="graphite"}`)
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rowsRead = metrics.NewCounter(`vm_protoparser_rows_read_total{type="graphite"}`)
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)
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func getStreamContext() *streamContext {
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select {
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case ctx := <-streamContextPoolCh:
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return ctx
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default:
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if v := streamContextPool.Get(); v != nil {
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return v.(*streamContext)
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}
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return &streamContext{}
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}
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}
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func putStreamContext(ctx *streamContext) {
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ctx.reset()
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select {
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case streamContextPoolCh <- ctx:
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default:
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streamContextPool.Put(ctx)
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}
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}
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var streamContextPool sync.Pool
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var streamContextPoolCh = make(chan *streamContext, runtime.GOMAXPROCS(-1))
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