-
Notifications
You must be signed in to change notification settings - Fork 438
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add doc.go for core/api, flow and circuitbreaker package (#235)
- Loading branch information
Showing
4 changed files
with
179 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,3 @@ | ||
| // Package api provides fundamental APIs of Sentinel. | ||
| package api | ||
|
|
||
| import ( | ||
|
|
||
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // Package api provides the topmost fundamental APIs for users using sentinel-golang. | ||
| // Users must initialize Sentinel before loading Sentinel rules. Sentinel support three ways to perform initialization: | ||
| // | ||
| // 1. api.InitDefault(), using default config to initialize. | ||
| // 2. api.InitWithConfig(confEntity *config.Entity), using customized config Entity to initialize. | ||
| // 3. api.InitWithConfigFile(configPath string), using yaml file to initialize. | ||
| // | ||
| // Here is the example code to use Sentinel: | ||
| // | ||
| // import sentinel "github.com/alibaba/sentinel-golang/api" | ||
| // | ||
| // err := sentinel.InitDefault() | ||
| // if err != nil { | ||
| // log.Fatal(err) | ||
| // } | ||
| // | ||
| // //Load sentinel rules | ||
| // _, err = flow.LoadRules([]*flow.Rule{ | ||
| // { | ||
| // Resource: "some-test", | ||
| // MetricType: flow.QPS, | ||
| // Count: 10, | ||
| // ControlBehavior: flow.Reject, | ||
| // }, | ||
| // }) | ||
| // if err != nil { | ||
| // log.Fatalf("Unexpected error: %+v", err) | ||
| // return | ||
| // } | ||
| // ch := make(chan struct{}) | ||
| // for i := 0; i < 10; i++ { | ||
| // go func() { | ||
| // for { | ||
| // e, b := sentinel.Entry("some-test", sentinel.WithTrafficType(base.Inbound)) | ||
| // if b != nil { | ||
| // // Blocked. We could get the block reason from the BlockError. | ||
| // time.Sleep(time.Duration(rand.Uint64()%10) * time.Millisecond) | ||
| // } else { | ||
| // // Passed, wrap the logic here. | ||
| // fmt.Println(util.CurrentTimeMillis(), "passed") | ||
| // time.Sleep(time.Duration(rand.Uint64()%10) * time.Millisecond) | ||
| // // Be sure the entry is exited finally. | ||
| // e.Exit() | ||
| // } | ||
| // } | ||
| // }() | ||
| // } | ||
| // <-ch | ||
| // | ||
| package api |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| // Package circuitbreaker implements the circuit breaker. | ||
| // | ||
| // Sentinel circuit breaker module converts each Rule into a CircuitBreaker. Each CircuitBreaker has its own statistical structure. | ||
| // | ||
| // Sentinel circuit breaker module supports three strategies: | ||
| // | ||
| // 1. SlowRequestRatio: the ratio of slow response time entry(entry's response time is great than max slow response time) exceeds the threshold. The following entry to resource will be broken. | ||
| // In SlowRequestRatio strategy, user must set max response time. | ||
| // 2. ErrorRatio: the ratio of error entry exceeds the threshold. The following entry to resource will be broken. | ||
| // 3. ErrorCount: the number of error entry exceeds the threshold. The following entry to resource will be broken. | ||
| // | ||
| // Sentinel circuit breaker is implemented based on state machines. There are three state: | ||
| // | ||
| // 1. Closed: all entries could pass checking. | ||
| // 2. Open: the circuit breaker is broken, all entries are blocked. After retry timeout, circuit breaker switches state to Half-Open and allows one entry to probe whether the resource returns to its expected state. | ||
| // 3. Half-Open: the circuit breaker is in a temporary state of probing, only one entry is allowed to access resource, others are blocked. | ||
| // | ||
| // Sentinel circuit breaker provides the listener to listen on the state changes. | ||
| // | ||
| // type StateChangeListener interface { | ||
| // OnTransformToClosed(prev State, rule Rule) | ||
| // | ||
| // OnTransformToOpen(prev State, rule Rule, snapshot interface{}) | ||
| // | ||
| // OnTransformToHalfOpen(prev State, rule Rule) | ||
| // } | ||
| // | ||
| // Here is the example code to use circuit breaker: | ||
| // | ||
| // type stateChangeTestListener struct {} | ||
| // | ||
| // func (s *stateChangeTestListener) OnTransformToClosed(prev circuitbreaker.State, rule circuitbreaker.Rule) { | ||
| // fmt.Printf("rule.steategy: %+v, From %s to Closed, time: %d\n", rule.Strategy, prev.String(), util.CurrentTimeMillis()) | ||
| // } | ||
| // | ||
| // func (s *stateChangeTestListener) OnTransformToOpen(prev circuitbreaker.State, rule circuitbreaker.Rule, snapshot interface{}) { | ||
| // fmt.Printf("rule.steategy: %+v, From %s to Open, snapshot: %.2f, time: %d\n", rule.Strategy, prev.String(), snapshot, util.CurrentTimeMillis()) | ||
| // } | ||
| // | ||
| // func (s *stateChangeTestListener) OnTransformToHalfOpen(prev circuitbreaker.State, rule circuitbreaker.Rule) { | ||
| // fmt.Printf("rule.steategy: %+v, From %s to Half-Open, time: %d\n", rule.Strategy, prev.String(), util.CurrentTimeMillis()) | ||
| // } | ||
| // | ||
| // func main() { | ||
| // err := sentinel.InitDefault() | ||
| // if err != nil { | ||
| // log.Fatal(err) | ||
| // } | ||
| // ch := make(chan struct{}) | ||
| // // Register a state change listener so that we could observer the state change of the internal circuit breaker. | ||
| // circuitbreaker.RegisterStateChangeListeners(&stateChangeTestListener{}) | ||
| // | ||
| // _, err = circuitbreaker.LoadRules([]*circuitbreaker.Rule{ | ||
| // // Statistic time span=10s, recoveryTimeout=3s, slowRtUpperBound=50ms, maxSlowRequestRatio=50% | ||
| // { | ||
| // Resource: "abc", | ||
| // Strategy: circuitbreaker.SlowRequestRatio, | ||
| // RetryTimeoutMs: 3000, | ||
| // MinRequestAmount: 10, | ||
| // StatIntervalMs: 10000, | ||
| // MaxAllowedRtMs: 50, | ||
| // Threshold: 0.5, | ||
| // }, | ||
| // // Statistic time span=10s, recoveryTimeout=3s, maxErrorRatio=50% | ||
| // { | ||
| // Resource: "abc", | ||
| // Strategy: circuitbreaker.ErrorRatio, | ||
| // RetryTimeoutMs: 3000, | ||
| // MinRequestAmount: 10, | ||
| // StatIntervalMs: 10000, | ||
| // Threshold: 0.5, | ||
| // }, | ||
| // }) | ||
| // if err != nil { | ||
| // log.Fatal(err) | ||
| // } | ||
| // | ||
| // fmt.Println("Sentinel Go circuit breaking demo is running. You may see the pass/block metric in the metric log.") | ||
| // go func() { | ||
| // for { | ||
| // e, b := sentinel.Entry("abc") | ||
| // if b != nil { | ||
| // //fmt.Println("g1blocked") | ||
| // time.Sleep(time.Duration(rand.Uint64()%20) * time.Millisecond) | ||
| // } else { | ||
| // if rand.Uint64()%20 > 9 { | ||
| // // Record current invocation as error. | ||
| // sentinel.TraceError(e, errors.New("biz error")) | ||
| // } | ||
| // //fmt.Println("g1passed") | ||
| // time.Sleep(time.Duration(rand.Uint64()%80+10) * time.Millisecond) | ||
| // e.Exit() | ||
| // } | ||
| // } | ||
| // }() | ||
| // | ||
| // go func() { | ||
| // for { | ||
| // e, b := sentinel.Entry("abc") | ||
| // if b != nil { | ||
| // //fmt.Println("g2blocked") | ||
| // time.Sleep(time.Duration(rand.Uint64()%20) * time.Millisecond) | ||
| // } else { | ||
| // //fmt.Println("g2passed") | ||
| // time.Sleep(time.Duration(rand.Uint64()%80) * time.Millisecond) | ||
| // e.Exit() | ||
| // } | ||
| // } | ||
| // }() | ||
| // <-ch | ||
| // } | ||
| // | ||
| package circuitbreaker |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| // Package flow implements the flow shaping control. | ||
| // | ||
| // flow module supports two statistic metric: QPS and Concurrency. | ||
| // | ||
| // The TrafficShapingController consists of two part: TrafficShapingCalculator and TrafficShapingChecker | ||
| // | ||
| // 1. TrafficShapingCalculator calculates the actual traffic shaping token threshold. Currently, Sentinel supports two token calculate strategy: Direct and WarmUp. | ||
| // 2. TrafficShapingChecker performs checking logic according to current metrics and the traffic shaping strategy, then yield the token result. Currently, Sentinel supports two control behavior: Reject and Throttling. | ||
| // | ||
| // Besides, Sentinel supports customized TrafficShapingCalculator and TrafficShapingChecker. User could call function SetTrafficShapingGenerator to register customized TrafficShapingController and call function RemoveTrafficShapingGenerator to unregister TrafficShapingController. | ||
| // There are a few notes users need to be aware of: | ||
| // | ||
| // 1. The function both SetTrafficShapingGenerator and RemoveTrafficShapingGenerator is not thread safe. | ||
| // 2. Users can not override the Sentinel supported TrafficShapingController. | ||
| // | ||
| package flow |