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measure.go
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measure.go
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// Package measure provides a Datastore wrapper that records metrics
// using github.com/codahale/metrics.
package measure
import (
"io"
"time"
"github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/codahale/metrics"
"github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore"
"github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-datastore/query"
)
// Histogram measurements exceeding these limits are dropped. TODO
// maybe it would be better to cap the value? Should we keep track of
// drops?
const (
maxLatency = int64(1 * time.Second)
maxSize = int64(1 << 32)
)
// New wraps the datastore, providing metrics on the operations. The
// metrics are registered with names starting with prefix and a dot.
//
// If prefix is not unique, New will panic. Call Close to release the
// prefix.
func New(prefix string, ds datastore.Datastore) *measure {
m := &measure{
backend: ds,
putNum: metrics.Counter(prefix + ".Put.num"),
putErr: metrics.Counter(prefix + ".Put.err"),
putLatency: metrics.NewHistogram(prefix+".Put.latency", 0, maxLatency, 3),
putSize: metrics.NewHistogram(prefix+".Put.size", 0, maxSize, 3),
getNum: metrics.Counter(prefix + ".Get.num"),
getErr: metrics.Counter(prefix + ".Get.err"),
getLatency: metrics.NewHistogram(prefix+".Get.latency", 0, maxLatency, 3),
getSize: metrics.NewHistogram(prefix+".Get.size", 0, maxSize, 3),
hasNum: metrics.Counter(prefix + ".Has.num"),
hasErr: metrics.Counter(prefix + ".Has.err"),
hasLatency: metrics.NewHistogram(prefix+".Has.latency", 0, maxLatency, 3),
deleteNum: metrics.Counter(prefix + ".Delete.num"),
deleteErr: metrics.Counter(prefix + ".Delete.err"),
deleteLatency: metrics.NewHistogram(prefix+".Delete.latency", 0, maxLatency, 3),
queryNum: metrics.Counter(prefix + ".Query.num"),
queryErr: metrics.Counter(prefix + ".Query.err"),
queryLatency: metrics.NewHistogram(prefix+".Query.latency", 0, maxLatency, 3),
}
return m
}
type measure struct {
backend datastore.Datastore
putNum metrics.Counter
putErr metrics.Counter
putLatency *metrics.Histogram
putSize *metrics.Histogram
getNum metrics.Counter
getErr metrics.Counter
getLatency *metrics.Histogram
getSize *metrics.Histogram
hasNum metrics.Counter
hasErr metrics.Counter
hasLatency *metrics.Histogram
deleteNum metrics.Counter
deleteErr metrics.Counter
deleteLatency *metrics.Histogram
queryNum metrics.Counter
queryErr metrics.Counter
queryLatency *metrics.Histogram
}
var _ datastore.Datastore = (*measure)(nil)
func recordLatency(h *metrics.Histogram, start time.Time) {
elapsed := time.Now().Sub(start) / time.Microsecond
_ = h.RecordValue(int64(elapsed))
}
func (m *measure) Put(key datastore.Key, value interface{}) error {
defer recordLatency(m.putLatency, time.Now())
m.putNum.Add()
if b, ok := value.([]byte); ok {
_ = m.putSize.RecordValue(int64(len(b)))
}
err := m.backend.Put(key, value)
if err != nil {
m.putErr.Add()
}
return err
}
func (m *measure) Get(key datastore.Key) (value interface{}, err error) {
defer recordLatency(m.getLatency, time.Now())
m.getNum.Add()
value, err = m.backend.Get(key)
if err != nil {
m.getErr.Add()
} else {
if b, ok := value.([]byte); ok {
_ = m.getSize.RecordValue(int64(len(b)))
}
}
return value, err
}
func (m *measure) Has(key datastore.Key) (exists bool, err error) {
defer recordLatency(m.hasLatency, time.Now())
m.hasNum.Add()
exists, err = m.backend.Has(key)
if err != nil {
m.hasErr.Add()
}
return exists, err
}
func (m *measure) Delete(key datastore.Key) error {
defer recordLatency(m.deleteLatency, time.Now())
m.deleteNum.Add()
err := m.backend.Delete(key)
if err != nil {
m.deleteErr.Add()
}
return err
}
func (m *measure) Query(q query.Query) (query.Results, error) {
defer recordLatency(m.queryLatency, time.Now())
m.queryNum.Add()
res, err := m.backend.Query(q)
if err != nil {
m.queryErr.Add()
}
return res, err
}
type measuredBatch struct {
puts int
deletes int
putts datastore.Batch
delts datastore.Batch
m *measure
}
func (m *measure) Batch() (datastore.Batch, error) {
bds, ok := m.backend.(datastore.Batching)
if !ok {
return nil, datastore.ErrBatchUnsupported
}
pb, err := bds.Batch()
if err != nil {
return nil, err
}
db, err := bds.Batch()
if err != nil {
return nil, err
}
return &measuredBatch{
putts: pb,
delts: db,
m: m,
}, nil
}
func (mt *measuredBatch) Put(key datastore.Key, val interface{}) error {
mt.puts++
valb, ok := val.([]byte)
if !ok {
return datastore.ErrInvalidType
}
_ = mt.m.putSize.RecordValue(int64(len(valb)))
return mt.putts.Put(key, val)
}
func (mt *measuredBatch) Delete(key datastore.Key) error {
mt.deletes++
return mt.delts.Delete(key)
}
func (mt *measuredBatch) Commit() error {
err := logBatchCommit(mt.delts, mt.deletes, mt.m.deleteNum, mt.m.deleteErr, mt.m.deleteLatency)
if err != nil {
return err
}
err = logBatchCommit(mt.putts, mt.puts, mt.m.putNum, mt.m.putErr, mt.m.putLatency)
if err != nil {
return err
}
return nil
}
func logBatchCommit(b datastore.Batch, n int, num, errs metrics.Counter, lat *metrics.Histogram) error {
if n > 0 {
before := time.Now()
err := b.Commit()
took := int(time.Now().Sub(before)/time.Microsecond) / n
num.AddN(uint64(n))
for i := 0; i < n; i++ {
_ = lat.RecordValue(int64(took))
}
if err != nil {
errs.Add()
return err
}
}
return nil
}
func (m *measure) Close() error {
m.putNum.Remove()
m.putErr.Remove()
m.putLatency.Remove()
m.putSize.Remove()
m.getNum.Remove()
m.getErr.Remove()
m.getLatency.Remove()
m.getSize.Remove()
m.hasNum.Remove()
m.hasErr.Remove()
m.hasLatency.Remove()
m.deleteNum.Remove()
m.deleteErr.Remove()
m.deleteLatency.Remove()
m.queryNum.Remove()
m.queryErr.Remove()
m.queryLatency.Remove()
if c, ok := m.backend.(io.Closer); ok {
return c.Close()
}
return nil
}