forked from grafana/loki
/
stage.go
216 lines (197 loc) · 4.71 KB
/
stage.go
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package stages
import (
"os"
"runtime"
"time"
"github.com/go-kit/log"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"gopkg.in/yaml.v2"
"github.com/grafana/loki/clients/pkg/promtail/api"
)
const (
StageTypeJSON = "json"
StageTypeLogfmt = "logfmt"
StageTypeRegex = "regex"
StageTypeReplace = "replace"
StageTypeMetric = "metrics"
StageTypeLabel = "labels"
StageTypeLabelDrop = "labeldrop"
StageTypeTimestamp = "timestamp"
StageTypeOutput = "output"
StageTypeDocker = "docker"
StageTypeCRI = "cri"
StageTypeMatch = "match"
StageTypeTemplate = "template"
StageTypePipeline = "pipeline"
StageTypeTenant = "tenant"
StageTypeDrop = "drop"
StageTypeLimit = "limit"
StageTypeMultiline = "multiline"
StageTypePack = "pack"
StageTypeLabelAllow = "labelallow"
StageTypeStaticLabels = "static_labels"
)
// Processor takes an existing set of labels, timestamp and log entry and returns either a possibly mutated
// timestamp and log entry
type Processor interface {
Process(labels model.LabelSet, extracted map[string]interface{}, time *time.Time, entry *string)
Name() string
}
type Entry struct {
Extracted map[string]interface{}
api.Entry
}
// Stage can receive entries via an inbound channel and forward mutated entries to an outbound channel.
type Stage interface {
Name() string
Run(chan Entry) chan Entry
}
func (entry *Entry) copy() *Entry {
out, err := yaml.Marshal(entry)
if err != nil {
return nil
}
var n *Entry
err = yaml.Unmarshal(out, &n)
if err != nil {
return nil
}
return n
}
// stageProcessor Allow to transform a Processor (old synchronous pipeline stage) into an async Stage
type stageProcessor struct {
Processor
inspector *inspector
}
func (s stageProcessor) Run(in chan Entry) chan Entry {
return RunWith(in, func(e Entry) Entry {
var before *Entry
if Inspect {
before = e.copy()
}
s.Process(e.Labels, e.Extracted, &e.Timestamp, &e.Line)
if Inspect {
s.inspector.inspect(s.Processor.Name(), before, e)
}
return e
})
}
func toStage(p Processor) Stage {
return &stageProcessor{
Processor: p,
inspector: newInspector(os.Stderr, runtime.GOOS == "windows"),
}
}
// New creates a new stage for the given type and configuration.
func New(logger log.Logger, jobName *string, stageType string,
cfg interface{}, registerer prometheus.Registerer) (Stage, error) {
var s Stage
var err error
switch stageType {
case StageTypeDocker:
s, err = NewDocker(logger, registerer)
if err != nil {
return nil, err
}
case StageTypeCRI:
s, err = NewCRI(logger, registerer)
if err != nil {
return nil, err
}
case StageTypeJSON:
s, err = newJSONStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeLogfmt:
s, err = newLogfmtStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeRegex:
s, err = newRegexStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeMetric:
s, err = newMetricStage(logger, cfg, registerer)
if err != nil {
return nil, err
}
case StageTypeLabel:
s, err = newLabelStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeLabelDrop:
s, err = newLabelDropStage(cfg)
if err != nil {
return nil, err
}
case StageTypeTimestamp:
s, err = newTimestampStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeOutput:
s, err = newOutputStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeMatch:
s, err = newMatcherStage(logger, jobName, cfg, registerer)
if err != nil {
return nil, err
}
case StageTypeTemplate:
s, err = newTemplateStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeTenant:
s, err = newTenantStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeReplace:
s, err = newReplaceStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypeDrop:
s, err = newDropStage(logger, cfg, registerer)
if err != nil {
return nil, err
}
case StageTypeLimit:
s, err = newLimitStage(logger, cfg, registerer)
if err != nil {
return nil, err
}
case StageTypeMultiline:
s, err = newMultilineStage(logger, cfg)
if err != nil {
return nil, err
}
case StageTypePack:
s, err = newPackStage(logger, cfg, registerer)
if err != nil {
return nil, err
}
case StageTypeLabelAllow:
s, err = newLabelAllowStage(cfg)
if err != nil {
return nil, err
}
case StageTypeStaticLabels:
s, err = newStaticLabelsStage(logger, cfg)
if err != nil {
return nil, err
}
default:
return nil, errors.Errorf("Unknown stage type: %s", stageType)
}
return s, nil
}