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stage.go
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stage.go
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package stages
// This package is ported over from grafana/loki/clients/pkg/logentry/stages.
// We aim to port the stages in steps, to avoid introducing huge amounts of
// new code without being able to slowly review, examine and test them.
import (
"os"
"runtime"
"time"
"github.com/go-kit/log"
"github.com/grafana/agent/component/common/loki"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"gopkg.in/yaml.v2"
)
// TODO(@tpaschalis) Let's use this as the list of stages we need to port over.
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"
StageTypeGeoIP = "geoip"
)
// 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{}
loki.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, cfg StageConfig, registerer prometheus.Registerer) (Stage, error) {
var (
s Stage
err error
)
switch {
case cfg.DockerConfig != nil:
s, err = NewDocker(logger, registerer)
if err != nil {
return nil, err
}
case cfg.CRIConfig != nil:
s, err = NewCRI(logger, registerer)
if err != nil {
return nil, err
}
case cfg.JSONConfig != nil:
s, err = newJSONStage(logger, *cfg.JSONConfig)
if err != nil {
return nil, err
}
case cfg.LogfmtConfig != nil:
s, err = newLogfmtStage(logger, *cfg.LogfmtConfig)
if err != nil {
return nil, err
}
case cfg.MetricsConfig != nil:
s, err = newMetricStage(logger, *cfg.MetricsConfig, registerer)
if err != nil {
return nil, err
}
case cfg.LabelsConfig != nil:
s, err = newLabelStage(logger, *cfg.LabelsConfig)
if err != nil {
return nil, err
}
case cfg.RegexConfig != nil:
s, err = newRegexStage(logger, *cfg.RegexConfig)
if err != nil {
return nil, err
}
case cfg.TimestampConfig != nil:
s, err = newTimestampStage(logger, *cfg.TimestampConfig)
if err != nil {
return nil, err
}
case cfg.OutputConfig != nil:
s, err = newOutputStage(logger, *cfg.OutputConfig)
if err != nil {
return nil, err
}
case cfg.MatchConfig != nil:
s, err = newMatcherStage(logger, jobName, *cfg.MatchConfig, registerer)
if err != nil {
return nil, err
}
case cfg.TemplateConfig != nil:
s, err = newTemplateStage(logger, *cfg.TemplateConfig)
if err != nil {
return nil, err
}
case cfg.TenantConfig != nil:
s, err = newTenantStage(logger, *cfg.TenantConfig)
if err != nil {
return nil, err
}
case cfg.ReplaceConfig != nil:
s, err = newReplaceStage(logger, *cfg.ReplaceConfig)
if err != nil {
return nil, err
}
case cfg.LimitConfig != nil:
s, err = newLimitStage(logger, *cfg.LimitConfig, registerer)
if err != nil {
return nil, err
}
case cfg.DropConfig != nil:
s, err = newDropStage(logger, *cfg.DropConfig, registerer)
if err != nil {
return nil, err
}
case cfg.MultilineConfig != nil:
s, err = newMultilineStage(logger, *cfg.MultilineConfig)
if err != nil {
return nil, err
}
case cfg.PackConfig != nil:
s = newPackStage(logger, *cfg.PackConfig, registerer)
case cfg.LabelAllowConfig != nil:
s, err = newLabelAllowStage(*cfg.LabelAllowConfig)
if err != nil {
return nil, err
}
case cfg.LabelDropConfig != nil:
s, err = newLabelDropStage(*cfg.LabelDropConfig)
if err != nil {
return nil, err
}
case cfg.StaticLabelsConfig != nil:
s, err = newStaticLabelsStage(logger, *cfg.StaticLabelsConfig)
if err != nil {
return nil, err
}
case cfg.GeoIPConfig != nil:
s, err = newGeoIPStage(logger, *cfg.GeoIPConfig)
if err != nil {
return nil, err
}
default:
panic("unreachable; should have decoded into one of the StageConfig fields")
}
return s, nil
}