mirror of
https://github.com/ChronosX88/go-throttle.git
synced 2024-11-12 17:21:01 +00:00
Implement basic throttle library
This commit is contained in:
ChronosX88
parent
6b7db7ac00
commit
03d2fcc823
GPG Key ID:
085A69A82C8C511A
1
.gitignore
vendored
Normal file
1
.gitignore
vendored
Normal file
@ -0,0 +1 @@
|
||||
/.idea
|
||||
21
LICENSE
Normal file
21
LICENSE
Normal file
@ -0,0 +1,21 @@
|
||||
MIT License
|
||||
|
||||
Copyright (c) 2021 ChronosX88
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
20
README.md
Normal file
20
README.md
Normal file
@ -0,0 +1,20 @@
|
||||
# go-throttle
|
||||
|
||||
The Go library for throttling some actions, for example, API requests to some network service.
|
||||
|
||||
## Install
|
||||
|
||||
Using Go Modules:
|
||||
|
||||
```
|
||||
go get github.com/ChronosX88/go-throttle
|
||||
```
|
||||
|
||||
## Usage
|
||||
|
||||
TBD
|
||||
|
||||
## License
|
||||
|
||||
This project is licensed under the MIT license, Copyright (c) 2021 ChronosX88. For more information see [LICENSE](LICENSE) file.
|
||||
|
||||
12
config.go
Normal file
12
config.go
Normal file
@ -0,0 +1,12 @@
|
||||
package throttle
|
||||
|
||||
import "time"
|
||||
|
||||
type Config struct {
|
||||
NumTokens float64
|
||||
Delay time.Duration
|
||||
RefillRate float64
|
||||
DefaultCost float64
|
||||
Capacity float64
|
||||
MaxCapacity int
|
||||
}
|
||||
5
go.mod
Normal file
5
go.mod
Normal file
@ -0,0 +1,5 @@
|
||||
module github.com/ChronosX88/go-throttle
|
||||
|
||||
go 1.15
|
||||
|
||||
require github.com/reactivex/rxgo/v2 v2.4.0
|
||||
40
go.sum
Normal file
40
go.sum
Normal file
@ -0,0 +1,40 @@
|
||||
github.com/cenkalti/backoff/v4 v4.0.0 h1:6VeaLF9aI+MAUQ95106HwWzYZgJJpZ4stumjj6RFYAU=
|
||||
github.com/cenkalti/backoff/v4 v4.0.0/go.mod h1:eEew/i+1Q6OrCDZh3WiXYv3+nJwBASZ8Bog/87DQnVg=
|
||||
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
|
||||
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
||||
github.com/emirpasic/gods v1.12.0 h1:QAUIPSaCu4G+POclxeqb3F+WPpdKqFGlw36+yOzGlrg=
|
||||
github.com/emirpasic/gods v1.12.0/go.mod h1:YfzfFFoVP/catgzJb4IKIqXjX78Ha8FMSDh3ymbK86o=
|
||||
github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
|
||||
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
|
||||
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
|
||||
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
|
||||
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
|
||||
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
|
||||
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
|
||||
github.com/reactivex/rxgo/v2 v2.4.0 h1:0GNRR1dnVjEWEXWTcQjIbCuJUi2XAn2u0qTKwSHkTZk=
|
||||
github.com/reactivex/rxgo/v2 v2.4.0/go.mod h1:NtZMAof7BaWwEiC4jNj7tUF+oCYOs7FnQBnzsyWwmgw=
|
||||
github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
|
||||
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
||||
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
|
||||
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
|
||||
go.uber.org/goleak v1.1.10 h1:z+mqJhf6ss6BSfSM671tgKyZBFPTTJM+HLxnhPC3wu0=
|
||||
go.uber.org/goleak v1.1.10/go.mod h1:8a7PlsEVH3e/a/GLqe5IIrQx6GzcnRmZEufDUTk4A7A=
|
||||
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
|
||||
golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
|
||||
golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
|
||||
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
|
||||
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
|
||||
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
|
||||
golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
|
||||
golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
|
||||
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
|
||||
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
|
||||
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
|
||||
golang.org/x/tools v0.0.0-20191108193012-7d206e10da11 h1:Yq9t9jnGoR+dBuitxdo9l6Q7xh/zOyNnYUtDKaQ3x0E=
|
||||
golang.org/x/tools v0.0.0-20191108193012-7d206e10da11/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
|
||||
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
|
||||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
|
||||
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
|
||||
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
|
||||
97
throttle.go
Normal file
97
throttle.go
Normal file
@ -0,0 +1,97 @@
|
||||
package throttle
|
||||
|
||||
import (
|
||||
"context"
|
||||
"github.com/reactivex/rxgo/v2"
|
||||
"math"
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
|
||||
type Throttle struct {
|
||||
lastTimestamp int64
|
||||
queueChan chan *req
|
||||
config Config
|
||||
cfgMut sync.Mutex
|
||||
running bool
|
||||
ctx context.Context
|
||||
}
|
||||
|
||||
func NewThrottle(ctx context.Context, cfg *Config) *Throttle {
|
||||
if cfg == nil {
|
||||
cfg = &Config{
|
||||
NumTokens: 0,
|
||||
Delay: 0.001,
|
||||
RefillRate: 0.001,
|
||||
DefaultCost: 1.000,
|
||||
Capacity: 1.000,
|
||||
}
|
||||
}
|
||||
|
||||
return &Throttle{
|
||||
lastTimestamp: -1,
|
||||
queueChan: make(chan *req, cfg.MaxCapacity),
|
||||
config: *cfg,
|
||||
running: false,
|
||||
ctx: ctx,
|
||||
}
|
||||
}
|
||||
|
||||
func (t *Throttle) run() {
|
||||
go func() {
|
||||
for {
|
||||
select {
|
||||
case <-t.ctx.Done(): {
|
||||
return
|
||||
}
|
||||
case r:=<-t.queueChan: {
|
||||
for {
|
||||
if t.config.NumTokens > 0 || t.config.RefillRate == 0 {
|
||||
r.resolveChan <- rxgo.Of(true)
|
||||
close(r.resolveChan)
|
||||
var cost float64 = 0
|
||||
if r.cost != -1 {
|
||||
cost = r.cost
|
||||
} else {
|
||||
cost = t.config.DefaultCost
|
||||
}
|
||||
t.config.NumTokens -= cost
|
||||
break
|
||||
}
|
||||
if t.lastTimestamp == -1 {
|
||||
t.lastTimestamp = time.Now().Unix()
|
||||
}
|
||||
now := time.Now().Unix()
|
||||
elapsed := now - t.lastTimestamp
|
||||
t.lastTimestamp = now
|
||||
t.config.NumTokens = math.Min(t.config.Capacity, t.config.NumTokens+float64(elapsed)*t.config.RefillRate)
|
||||
time.Sleep(t.config.Delay)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
}
|
||||
|
||||
func (t *Throttle) Take(rateLimit float64, cost float64) rxgo.Observable {
|
||||
t.cfgMut.Lock()
|
||||
defer t.cfgMut.Unlock()
|
||||
ch := make(chan rxgo.Item)
|
||||
t.queueChan <- &req{
|
||||
cost: cost,
|
||||
resolveChan: ch,
|
||||
}
|
||||
if rateLimit == 0 {
|
||||
t.config.RefillRate = 0
|
||||
} else {
|
||||
t.config.RefillRate = 1/rateLimit
|
||||
}
|
||||
return rxgo.FromChannel(ch)
|
||||
}
|
||||
|
||||
type req struct {
|
||||
cost float64
|
||||
resolveChan chan rxgo.Item
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user