79 lines
1.4 KiB
Go
79 lines
1.4 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package main
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import (
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"log"
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"sync"
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"time"
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"github.com/zeebo/admission/admproto"
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)
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const (
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kb = 1024
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)
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// Parser is a PacketDest that sends data to a MetricDest
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type Parser struct {
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dest MetricDest
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filters []*PacketFilter
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scratch sync.Pool
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}
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// NewParser creates a Parser. It sends metrics to dest, provided they pass all
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// of the provided PacketFilters
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func NewParser(dest MetricDest, filters ...*PacketFilter) *Parser {
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return &Parser{
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dest: dest,
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filters: filters,
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scratch: sync.Pool{
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New: func() interface{} {
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var x [10 * kb]byte
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return &x
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},
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},
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}
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}
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// Packet implements PacketDest
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func (p *Parser) Packet(data []byte, ts time.Time) (err error) {
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data, err = admproto.CheckChecksum(data)
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if err != nil {
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return err
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}
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scratch := p.scratch.Get().(*[10 * kb]byte)
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defer p.scratch.Put(scratch)
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r := admproto.NewReaderWith((*scratch)[:])
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data, appb, instb, err := r.Begin(data)
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if err != nil {
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return err
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}
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app, inst := string(appb), string(instb)
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for _, filter := range p.filters {
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if !filter.Filter(app, inst) {
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return nil
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}
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}
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var key []byte
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var value float64
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for len(data) > 0 {
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data, key, value, err = r.Next(data)
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if err != nil {
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return err
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}
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err = p.dest.Metric(app, inst, key, value, ts)
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if err != nil {
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log.Printf("failed to write metric: %v", err)
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continue
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}
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}
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return nil
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}
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