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stats.go
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stats.go
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package stats
import (
"context"
"fmt"
"sync"
"sync/atomic" //lint:ignore faillint we can't use go.uber.org/atomic with a protobuf struct without wrapping it.
"time"
"github.com/weaveworks/common/httpgrpc"
)
type contextKey int
var ctxKey = contextKey(0)
type QueryStats struct {
Stats
m sync.Mutex
}
// ContextWithEmptyStats returns a context with empty stats.
func ContextWithEmptyStats(ctx context.Context) (*QueryStats, context.Context) {
stats := &QueryStats{}
ctx = context.WithValue(ctx, ctxKey, stats)
return stats, ctx
}
// FromContext gets the Stats out of the Context. Returns nil if stats have not
// been initialised in the context.
func FromContext(ctx context.Context) *QueryStats {
o := ctx.Value(ctxKey)
if o == nil {
return nil
}
return o.(*QueryStats)
}
// IsEnabled returns whether stats tracking is enabled in the context.
func IsEnabled(ctx context.Context) bool {
// When query statistics are enabled, the stats object is already initialised
// within the context, so we can just check it.
return FromContext(ctx) != nil
}
// AddWallTime adds some time to the counter.
func (s *QueryStats) AddWallTime(t time.Duration) {
if s == nil {
return
}
atomic.AddInt64((*int64)(&s.WallTime), int64(t))
}
// LoadWallTime returns current wall time.
func (s *QueryStats) LoadWallTime() time.Duration {
if s == nil {
return 0
}
return time.Duration(atomic.LoadInt64((*int64)(&s.WallTime)))
}
func (s *QueryStats) AddFetchedSeries(series uint64) {
if s == nil {
return
}
atomic.AddUint64(&s.FetchedSeriesCount, series)
}
func (s *QueryStats) AddExtraFields(fieldsVals ...interface{}) {
if s == nil {
return
}
s.m.Lock()
defer s.m.Unlock()
if s.ExtraFields == nil {
s.ExtraFields = map[string]string{}
}
if len(fieldsVals)%2 == 1 {
fieldsVals = append(fieldsVals, "")
}
for i := 0; i < len(fieldsVals); i += 2 {
if v, ok := fieldsVals[i].(string); ok {
s.ExtraFields[v] = fmt.Sprintf("%v", fieldsVals[i+1])
}
}
}
func (s *QueryStats) LoadExtraFields() []interface{} {
if s == nil {
return []interface{}{}
}
s.m.Lock()
defer s.m.Unlock()
r := make([]interface{}, 0, len(s.ExtraFields))
for k, v := range s.ExtraFields {
r = append(r, k, v)
}
return r
}
func (s *QueryStats) LoadFetchedSeries() uint64 {
if s == nil {
return 0
}
return atomic.LoadUint64(&s.FetchedSeriesCount)
}
func (s *QueryStats) AddFetchedChunkBytes(bytes uint64) {
if s == nil {
return
}
atomic.AddUint64(&s.FetchedChunkBytes, bytes)
}
func (s *QueryStats) LoadFetchedChunkBytes() uint64 {
if s == nil {
return 0
}
return atomic.LoadUint64(&s.FetchedChunkBytes)
}
func (s *QueryStats) AddFetchedDataBytes(bytes uint64) {
if s == nil {
return
}
atomic.AddUint64(&s.FetchedDataBytes, bytes)
}
func (s *QueryStats) LoadFetchedDataBytes() uint64 {
if s == nil {
return 0
}
return atomic.LoadUint64(&s.FetchedDataBytes)
}
func (s *QueryStats) AddFetchedSamples(count uint64) {
if s == nil {
return
}
atomic.AddUint64(&s.FetchedSamplesCount, count)
}
func (s *QueryStats) LoadFetchedSamples() uint64 {
if s == nil {
return 0
}
return atomic.LoadUint64(&s.FetchedSamplesCount)
}
func (s *QueryStats) AddFetchedChunks(count uint64) {
if s == nil {
return
}
atomic.AddUint64(&s.FetchedChunksCount, count)
}
func (s *QueryStats) LoadFetchedChunks() uint64 {
if s == nil {
return 0
}
return atomic.LoadUint64(&s.FetchedChunksCount)
}
// Merge the provided Stats into this one.
func (s *QueryStats) Merge(other *QueryStats) {
if s == nil || other == nil {
return
}
s.AddWallTime(other.LoadWallTime())
s.AddFetchedSeries(other.LoadFetchedSeries())
s.AddFetchedChunkBytes(other.LoadFetchedChunkBytes())
s.AddFetchedDataBytes(other.LoadFetchedDataBytes())
s.AddFetchedSamples(other.LoadFetchedSamples())
s.AddFetchedChunks(other.LoadFetchedChunks())
s.AddExtraFields(other.LoadExtraFields()...)
}
func ShouldTrackHTTPGRPCResponse(r *httpgrpc.HTTPResponse) bool {
// Do no track statistics for requests failed because of a server error.
return r.Code < 500
}