/
logfilter.go
202 lines (183 loc) · 5.71 KB
/
logfilter.go
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package dpsink
import (
"context"
"encoding/json"
"expvar"
"fmt"
"net/http"
"sync"
"sync/atomic"
"time"
"github.com/signalfx/golib/v3/datapoint"
"github.com/signalfx/golib/v3/event"
"github.com/signalfx/golib/v3/log"
"github.com/signalfx/golib/v3/trace"
)
// FlagCheck checks a context to see if a debug flag is set
type FlagCheck interface {
HasFlag(ctx context.Context) bool
}
// ItemFlagger will flag events and datapoints according to which dimensions are set or if the
// connection context has a flag set.
type ItemFlagger struct {
CtxFlagCheck FlagCheck
Logger log.Logger
EventMetaName string
SpanMetaName string
MetricDimensionName string
dimensions map[string]string
mu sync.RWMutex
stats struct {
totalDpCtxSignals int64
totalEvCtxSignals int64
totalSpCtxSignals int64
totalDpDimSignals int64
totalEvDimSignals int64
}
}
// SetDatapointFlag flags the datapoint as connected to this flagger
func (f *ItemFlagger) SetDatapointFlag(dp *datapoint.Datapoint) {
dp.Meta[f] = struct{}{}
}
// HasDatapointFlag return true if the datapoint is connected to this item
func (f *ItemFlagger) HasDatapointFlag(dp *datapoint.Datapoint) bool {
_, exists := dp.Meta[f]
return exists
}
// SetEventFlag flags the event as connected to this flagger
func (f *ItemFlagger) SetEventFlag(ev *event.Event) {
ev.Properties[f.EventMetaName] = f
}
// HasEventFlag return true if the event is connected to this item
func (f *ItemFlagger) HasEventFlag(ev *event.Event) bool {
if f == nil {
return false
}
setTo, exists := ev.Properties[f.EventMetaName]
return exists && setTo == f
}
// SetDimensions controls which dimensions are flagged
func (f *ItemFlagger) SetDimensions(dims map[string]string) {
f.mu.Lock()
f.dimensions = dims
f.mu.Unlock()
}
// GetDimensions returns which dimensions are flagged
func (f *ItemFlagger) GetDimensions() map[string]string {
f.mu.RLock()
ret := f.dimensions
f.mu.RUnlock()
return ret
}
// SetDatapointFlags sets the log flag for every datapoint if the signal is inside the context
func (f *ItemFlagger) SetDatapointFlags(ctx context.Context, points []*datapoint.Datapoint) {
if f.CtxFlagCheck.HasFlag(ctx) {
atomic.AddInt64(&f.stats.totalDpCtxSignals, 1)
for _, dp := range points {
f.SetDatapointFlag(dp)
}
}
dims := f.GetDimensions()
if len(dims) == 0 {
return
}
for _, dp := range points {
if dpMatches(dp, f.MetricDimensionName, dims) {
atomic.AddInt64(&f.stats.totalDpDimSignals, 1)
f.SetDatapointFlag(dp)
}
}
}
// AddDatapoints adds a signal to each datapoint if the signal is inside the context
func (f *ItemFlagger) AddDatapoints(ctx context.Context, points []*datapoint.Datapoint, next Sink) error {
f.SetDatapointFlags(ctx, points)
return next.AddDatapoints(ctx, points)
}
// AddEvents adds a signal to each event if the signal is inside the context
func (f *ItemFlagger) AddEvents(ctx context.Context, events []*event.Event, next Sink) error {
if f.CtxFlagCheck.HasFlag(ctx) {
atomic.AddInt64(&f.stats.totalEvCtxSignals, 1)
for _, dp := range events {
f.SetEventFlag(dp)
}
return next.AddEvents(ctx, events)
}
dims := f.GetDimensions()
if len(dims) == 0 {
return next.AddEvents(ctx, events)
}
for _, ev := range events {
if evMatches(ev, dims) {
atomic.AddInt64(&f.stats.totalEvDimSignals, 1)
f.SetEventFlag(ev)
}
}
return next.AddEvents(ctx, events)
}
// AddSpans is a pass-through
func (f *ItemFlagger) AddSpans(ctx context.Context, spans []*trace.Span, next trace.Sink) error {
return next.AddSpans(ctx, spans)
}
// Datapoints returns debug stat information about the flagger
func (f *ItemFlagger) Datapoints() []*datapoint.Datapoint {
return []*datapoint.Datapoint{
datapoint.New("totalDpCtxSignals", nil, datapoint.NewIntValue(f.stats.totalDpCtxSignals), datapoint.Counter, time.Time{}),
datapoint.New("totalEvCtxSignals", nil, datapoint.NewIntValue(f.stats.totalEvCtxSignals), datapoint.Counter, time.Time{}),
datapoint.New("totalDpDimSignals", nil, datapoint.NewIntValue(f.stats.totalDpDimSignals), datapoint.Counter, time.Time{}),
datapoint.New("totalEvDimSignals", nil, datapoint.NewIntValue(f.stats.totalEvDimSignals), datapoint.Counter, time.Time{}),
}
}
// ServeHTTP supports GET to see the current dimensions and POST to change the current dimensions.
// POST expects (and GET returns) a JSON encoded map[string]string
func (f *ItemFlagger) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if req.Method == "POST" {
var newDimensions map[string]string
err := json.NewDecoder(req.Body).Decode(&newDimensions)
if err != nil {
rw.WriteHeader(http.StatusBadRequest)
_, err = fmt.Fprintf(rw, "Cannot decode request JSON: %s", err.Error())
log.IfErr(f.Logger, err)
return
}
log.IfErr(f.Logger, req.Body.Close())
f.SetDimensions(newDimensions)
_, err = fmt.Fprintf(rw, "Dimensions updated!")
log.IfErr(f.Logger, err)
return
}
if req.Method == "GET" {
log.IfErr(f.Logger, json.NewEncoder(rw).Encode(f.GetDimensions()))
return
}
http.NotFound(rw, req)
}
// Var returns the dimensions that are being filtered
func (f *ItemFlagger) Var() expvar.Var {
return expvar.Func(func() interface{} {
return f.GetDimensions()
})
}
func dpMatches(dp *datapoint.Datapoint, metricDimensionName string, dimsToCheck map[string]string) bool {
for k, v := range dimsToCheck {
if k == metricDimensionName {
if v != dp.Metric {
return false
}
continue
}
dpVal, exists := dp.Dimensions[k]
if !exists || dpVal != v {
return false
}
}
return true
}
func evMatches(ev *event.Event, dimsToCheck map[string]string) bool {
for k, v := range dimsToCheck {
dpVal, exists := ev.Dimensions[k]
if !exists || dpVal != v {
return false
}
}
return true
}