tusd/pkg/handler/metrics.go

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package handler
import (
Squashed commit of the following: commit d214ad5c92073cb754c70ab73e6cf229cba01c72 Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:38:47 2017 +0100 Minor code and comment cleanups commit 2826227404296d98a2d83519efaa754cc07a47b1 Merge: db47c89 1a58d6e Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:13:15 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 1a58d6e084631f5c039dd64a303b524abce6d4f2 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 19:14:21 2017 +0100 prometheus metrics typo commit db47c8976489917a8afc53878335ab66d73fe60d Merge: 168942b 12054be Author: Marius <maerious@gmail.com> Date: Tue Feb 28 17:36:47 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 12054be4e76814f286f4630e7fedae36a9cdba77 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 12:07:43 2017 +0100 add go vet on travis commit 16e95d2d91d318493c3090eeadf8eeb74d8088ad Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:58:58 2017 +0100 add one go vet on appveyor commit 13bc64517ba84741ad26ade44c1e8aa3ed451eba Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:57:56 2017 +0100 use even less pointers commit db7130f18a9c69f060cf65e6909f753a4b3cc238 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 27 22:12:45 2017 +0100 use pointer only when needed commit 647f7390c6599aa7e4a8747d62ebdfb4ddc5b980 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 23 16:29:01 2017 +0100 Prevent lock malfunction literal copies lock value from metrics commit 1ce196ed35492684666d4512f82fcd5f6c3e24b0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:22:19 2017 +0100 handle read timeout simplification in metrics commit 338017c9f4b24e5733787a6b0fd5fd8ea1bd8991 Merge: c378bc9 45a9278 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:21:42 2017 +0100 Merge branch 'master' into metrics_race_condition commit c378bc97988363707d0ec3d185cc7ca830d7a5e0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:51:56 2017 +0100 consistent naming commit e2b0050b8d00f5df9bf7941cca986457b2d91df1 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:44:05 2017 +0100 Use a simplfied error structure for error counting commit 3da4095c082fca8be187fb58a25c8b1fa6b316a6 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 20 16:38:27 2017 +0100 split ptr retrieval and incrementation commit ebd6873cbbf669590ef2946ee98c55ed194cb150 Author: oliverpool <oliverpool@hotmail.fr> Date: Sun Feb 5 22:01:34 2017 +0100 Useless initialization commit 691224cdbf6b16027c598102d561c16239d959b7 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:55 2017 +0100 increment the pointer commit 3d9395e1df1df279e7f54de9e00dd4c37c882042 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:42 2017 +0100 Simplify lock logic commit d7a46190802a5b8312d44839228ffe46947e69d2 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 1 08:37:46 2017 +0100 Prevent race condition on errorstotal increment The HTTPError interface is used to have detailed metrics (by code as well)
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"errors"
"sync"
"sync/atomic"
)
// Metrics provides numbers about the usage of the tusd handler. Since these may
// be accessed from multiple goroutines, it is necessary to read and modify them
// atomically using the functions exposed in the sync/atomic package, such as
// atomic.LoadUint64. In addition the maps must not be modified to prevent data
// races.
type Metrics struct {
// RequestTotal counts the number of incoming requests per method
RequestsTotal map[string]*uint64
// ErrorsTotal counts the number of returned errors by their message
Squashed commit of the following: commit d214ad5c92073cb754c70ab73e6cf229cba01c72 Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:38:47 2017 +0100 Minor code and comment cleanups commit 2826227404296d98a2d83519efaa754cc07a47b1 Merge: db47c89 1a58d6e Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:13:15 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 1a58d6e084631f5c039dd64a303b524abce6d4f2 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 19:14:21 2017 +0100 prometheus metrics typo commit db47c8976489917a8afc53878335ab66d73fe60d Merge: 168942b 12054be Author: Marius <maerious@gmail.com> Date: Tue Feb 28 17:36:47 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 12054be4e76814f286f4630e7fedae36a9cdba77 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 12:07:43 2017 +0100 add go vet on travis commit 16e95d2d91d318493c3090eeadf8eeb74d8088ad Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:58:58 2017 +0100 add one go vet on appveyor commit 13bc64517ba84741ad26ade44c1e8aa3ed451eba Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:57:56 2017 +0100 use even less pointers commit db7130f18a9c69f060cf65e6909f753a4b3cc238 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 27 22:12:45 2017 +0100 use pointer only when needed commit 647f7390c6599aa7e4a8747d62ebdfb4ddc5b980 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 23 16:29:01 2017 +0100 Prevent lock malfunction literal copies lock value from metrics commit 1ce196ed35492684666d4512f82fcd5f6c3e24b0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:22:19 2017 +0100 handle read timeout simplification in metrics commit 338017c9f4b24e5733787a6b0fd5fd8ea1bd8991 Merge: c378bc9 45a9278 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:21:42 2017 +0100 Merge branch 'master' into metrics_race_condition commit c378bc97988363707d0ec3d185cc7ca830d7a5e0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:51:56 2017 +0100 consistent naming commit e2b0050b8d00f5df9bf7941cca986457b2d91df1 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:44:05 2017 +0100 Use a simplfied error structure for error counting commit 3da4095c082fca8be187fb58a25c8b1fa6b316a6 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 20 16:38:27 2017 +0100 split ptr retrieval and incrementation commit ebd6873cbbf669590ef2946ee98c55ed194cb150 Author: oliverpool <oliverpool@hotmail.fr> Date: Sun Feb 5 22:01:34 2017 +0100 Useless initialization commit 691224cdbf6b16027c598102d561c16239d959b7 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:55 2017 +0100 increment the pointer commit 3d9395e1df1df279e7f54de9e00dd4c37c882042 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:42 2017 +0100 Simplify lock logic commit d7a46190802a5b8312d44839228ffe46947e69d2 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 1 08:37:46 2017 +0100 Prevent race condition on errorstotal increment The HTTPError interface is used to have detailed metrics (by code as well)
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ErrorsTotal *ErrorsTotalMap
BytesReceived *uint64
UploadsFinished *uint64
UploadsCreated *uint64
UploadsTerminated *uint64
}
// incRequestsTotal increases the counter for this request method atomically by
// one. The method must be one of GET, HEAD, POST, PATCH, DELETE.
func (m Metrics) incRequestsTotal(method string) {
if ptr, ok := m.RequestsTotal[method]; ok {
atomic.AddUint64(ptr, 1)
}
}
// incErrorsTotal increases the counter for this error atomically by one.
Squashed commit of the following: commit d214ad5c92073cb754c70ab73e6cf229cba01c72 Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:38:47 2017 +0100 Minor code and comment cleanups commit 2826227404296d98a2d83519efaa754cc07a47b1 Merge: db47c89 1a58d6e Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:13:15 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 1a58d6e084631f5c039dd64a303b524abce6d4f2 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 19:14:21 2017 +0100 prometheus metrics typo commit db47c8976489917a8afc53878335ab66d73fe60d Merge: 168942b 12054be Author: Marius <maerious@gmail.com> Date: Tue Feb 28 17:36:47 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 12054be4e76814f286f4630e7fedae36a9cdba77 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 12:07:43 2017 +0100 add go vet on travis commit 16e95d2d91d318493c3090eeadf8eeb74d8088ad Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:58:58 2017 +0100 add one go vet on appveyor commit 13bc64517ba84741ad26ade44c1e8aa3ed451eba Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:57:56 2017 +0100 use even less pointers commit db7130f18a9c69f060cf65e6909f753a4b3cc238 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 27 22:12:45 2017 +0100 use pointer only when needed commit 647f7390c6599aa7e4a8747d62ebdfb4ddc5b980 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 23 16:29:01 2017 +0100 Prevent lock malfunction literal copies lock value from metrics commit 1ce196ed35492684666d4512f82fcd5f6c3e24b0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:22:19 2017 +0100 handle read timeout simplification in metrics commit 338017c9f4b24e5733787a6b0fd5fd8ea1bd8991 Merge: c378bc9 45a9278 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:21:42 2017 +0100 Merge branch 'master' into metrics_race_condition commit c378bc97988363707d0ec3d185cc7ca830d7a5e0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:51:56 2017 +0100 consistent naming commit e2b0050b8d00f5df9bf7941cca986457b2d91df1 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:44:05 2017 +0100 Use a simplfied error structure for error counting commit 3da4095c082fca8be187fb58a25c8b1fa6b316a6 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 20 16:38:27 2017 +0100 split ptr retrieval and incrementation commit ebd6873cbbf669590ef2946ee98c55ed194cb150 Author: oliverpool <oliverpool@hotmail.fr> Date: Sun Feb 5 22:01:34 2017 +0100 Useless initialization commit 691224cdbf6b16027c598102d561c16239d959b7 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:55 2017 +0100 increment the pointer commit 3d9395e1df1df279e7f54de9e00dd4c37c882042 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:42 2017 +0100 Simplify lock logic commit d7a46190802a5b8312d44839228ffe46947e69d2 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 1 08:37:46 2017 +0100 Prevent race condition on errorstotal increment The HTTPError interface is used to have detailed metrics (by code as well)
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func (m Metrics) incErrorsTotal(err HTTPError) {
ptr := m.ErrorsTotal.retrievePointerFor(err)
atomic.AddUint64(ptr, 1)
}
// incBytesReceived increases the number of received bytes atomically be the
// specified number.
func (m Metrics) incBytesReceived(delta uint64) {
atomic.AddUint64(m.BytesReceived, delta)
}
// incUploadsFinished increases the counter for finished uploads atomically by one.
func (m Metrics) incUploadsFinished() {
atomic.AddUint64(m.UploadsFinished, 1)
}
// incUploadsCreated increases the counter for completed uploads atomically by one.
func (m Metrics) incUploadsCreated() {
atomic.AddUint64(m.UploadsCreated, 1)
}
// incUploadsTerminated increases the counter for completed uploads atomically by one.
func (m Metrics) incUploadsTerminated() {
atomic.AddUint64(m.UploadsTerminated, 1)
}
func newMetrics() Metrics {
return Metrics{
RequestsTotal: map[string]*uint64{
"GET": new(uint64),
"HEAD": new(uint64),
"POST": new(uint64),
"PATCH": new(uint64),
"DELETE": new(uint64),
"OPTIONS": new(uint64),
},
ErrorsTotal: newErrorsTotalMap(),
BytesReceived: new(uint64),
UploadsFinished: new(uint64),
UploadsCreated: new(uint64),
UploadsTerminated: new(uint64),
}
}
Squashed commit of the following: commit d214ad5c92073cb754c70ab73e6cf229cba01c72 Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:38:47 2017 +0100 Minor code and comment cleanups commit 2826227404296d98a2d83519efaa754cc07a47b1 Merge: db47c89 1a58d6e Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:13:15 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 1a58d6e084631f5c039dd64a303b524abce6d4f2 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 19:14:21 2017 +0100 prometheus metrics typo commit db47c8976489917a8afc53878335ab66d73fe60d Merge: 168942b 12054be Author: Marius <maerious@gmail.com> Date: Tue Feb 28 17:36:47 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 12054be4e76814f286f4630e7fedae36a9cdba77 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 12:07:43 2017 +0100 add go vet on travis commit 16e95d2d91d318493c3090eeadf8eeb74d8088ad Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:58:58 2017 +0100 add one go vet on appveyor commit 13bc64517ba84741ad26ade44c1e8aa3ed451eba Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:57:56 2017 +0100 use even less pointers commit db7130f18a9c69f060cf65e6909f753a4b3cc238 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 27 22:12:45 2017 +0100 use pointer only when needed commit 647f7390c6599aa7e4a8747d62ebdfb4ddc5b980 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 23 16:29:01 2017 +0100 Prevent lock malfunction literal copies lock value from metrics commit 1ce196ed35492684666d4512f82fcd5f6c3e24b0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:22:19 2017 +0100 handle read timeout simplification in metrics commit 338017c9f4b24e5733787a6b0fd5fd8ea1bd8991 Merge: c378bc9 45a9278 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:21:42 2017 +0100 Merge branch 'master' into metrics_race_condition commit c378bc97988363707d0ec3d185cc7ca830d7a5e0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:51:56 2017 +0100 consistent naming commit e2b0050b8d00f5df9bf7941cca986457b2d91df1 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:44:05 2017 +0100 Use a simplfied error structure for error counting commit 3da4095c082fca8be187fb58a25c8b1fa6b316a6 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 20 16:38:27 2017 +0100 split ptr retrieval and incrementation commit ebd6873cbbf669590ef2946ee98c55ed194cb150 Author: oliverpool <oliverpool@hotmail.fr> Date: Sun Feb 5 22:01:34 2017 +0100 Useless initialization commit 691224cdbf6b16027c598102d561c16239d959b7 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:55 2017 +0100 increment the pointer commit 3d9395e1df1df279e7f54de9e00dd4c37c882042 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:42 2017 +0100 Simplify lock logic commit d7a46190802a5b8312d44839228ffe46947e69d2 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 1 08:37:46 2017 +0100 Prevent race condition on errorstotal increment The HTTPError interface is used to have detailed metrics (by code as well)
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// ErrorsTotalMap stores the counters for the different HTTP errors.
type ErrorsTotalMap struct {
lock sync.RWMutex
counter map[simpleHTTPError]*uint64
}
type simpleHTTPError struct {
Message string
StatusCode int
}
func simplifyHTTPError(err HTTPError) simpleHTTPError {
return simpleHTTPError{
Message: err.Error(),
Squashed commit of the following: commit d214ad5c92073cb754c70ab73e6cf229cba01c72 Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:38:47 2017 +0100 Minor code and comment cleanups commit 2826227404296d98a2d83519efaa754cc07a47b1 Merge: db47c89 1a58d6e Author: Marius <maerious@gmail.com> Date: Tue Feb 28 20:13:15 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 1a58d6e084631f5c039dd64a303b524abce6d4f2 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 19:14:21 2017 +0100 prometheus metrics typo commit db47c8976489917a8afc53878335ab66d73fe60d Merge: 168942b 12054be Author: Marius <maerious@gmail.com> Date: Tue Feb 28 17:36:47 2017 +0100 Merge branch 'metrics_race_condition' of https://github.com/oliverpool/tusd into oliverpool-metrics_race_condition commit 12054be4e76814f286f4630e7fedae36a9cdba77 Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 12:07:43 2017 +0100 add go vet on travis commit 16e95d2d91d318493c3090eeadf8eeb74d8088ad Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:58:58 2017 +0100 add one go vet on appveyor commit 13bc64517ba84741ad26ade44c1e8aa3ed451eba Author: oliverpool <oliverpool@hotmail.fr> Date: Tue Feb 28 11:57:56 2017 +0100 use even less pointers commit db7130f18a9c69f060cf65e6909f753a4b3cc238 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 27 22:12:45 2017 +0100 use pointer only when needed commit 647f7390c6599aa7e4a8747d62ebdfb4ddc5b980 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 23 16:29:01 2017 +0100 Prevent lock malfunction literal copies lock value from metrics commit 1ce196ed35492684666d4512f82fcd5f6c3e24b0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:22:19 2017 +0100 handle read timeout simplification in metrics commit 338017c9f4b24e5733787a6b0fd5fd8ea1bd8991 Merge: c378bc9 45a9278 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 12:21:42 2017 +0100 Merge branch 'master' into metrics_race_condition commit c378bc97988363707d0ec3d185cc7ca830d7a5e0 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:51:56 2017 +0100 consistent naming commit e2b0050b8d00f5df9bf7941cca986457b2d91df1 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 22 11:44:05 2017 +0100 Use a simplfied error structure for error counting commit 3da4095c082fca8be187fb58a25c8b1fa6b316a6 Author: oliverpool <oliverpool@hotmail.fr> Date: Mon Feb 20 16:38:27 2017 +0100 split ptr retrieval and incrementation commit ebd6873cbbf669590ef2946ee98c55ed194cb150 Author: oliverpool <oliverpool@hotmail.fr> Date: Sun Feb 5 22:01:34 2017 +0100 Useless initialization commit 691224cdbf6b16027c598102d561c16239d959b7 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:55 2017 +0100 increment the pointer commit 3d9395e1df1df279e7f54de9e00dd4c37c882042 Author: oliverpool <oliverpool@hotmail.fr> Date: Thu Feb 2 08:25:42 2017 +0100 Simplify lock logic commit d7a46190802a5b8312d44839228ffe46947e69d2 Author: oliverpool <oliverpool@hotmail.fr> Date: Wed Feb 1 08:37:46 2017 +0100 Prevent race condition on errorstotal increment The HTTPError interface is used to have detailed metrics (by code as well)
2017-02-28 19:39:25 +00:00
StatusCode: err.StatusCode(),
}
}
func newErrorsTotalMap() *ErrorsTotalMap {
m := make(map[simpleHTTPError]*uint64, 20)
return &ErrorsTotalMap{
counter: m,
}
}
// retrievePointerFor returns (after creating it if necessary) the pointer to
// the counter for the error.
func (e *ErrorsTotalMap) retrievePointerFor(err HTTPError) *uint64 {
serr := simplifyHTTPError(err)
e.lock.RLock()
ptr, ok := e.counter[serr]
e.lock.RUnlock()
if ok {
return ptr
}
// For pointer creation, a write-lock is required
e.lock.Lock()
// We ensure that the pointer wasn't created in the meantime
if ptr, ok = e.counter[serr]; !ok {
ptr = new(uint64)
e.counter[serr] = ptr
}
e.lock.Unlock()
return ptr
}
// Load retrieves the map of the counter pointers atomically
func (e *ErrorsTotalMap) Load() map[HTTPError]*uint64 {
m := make(map[HTTPError]*uint64, len(e.counter))
e.lock.RLock()
for err, ptr := range e.counter {
httpErr := NewHTTPError(errors.New(err.Message), err.StatusCode)
m[httpErr] = ptr
}
e.lock.RUnlock()
return m
}