| // Copyright Istio Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package traffic |
| |
| import ( |
| "time" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/test" |
| "github.com/apache/dubbo-go-pixiu/pkg/test/framework/components/echo" |
| "github.com/apache/dubbo-go-pixiu/pkg/test/framework/components/echo/check" |
| ) |
| |
| const ( |
| defaultInterval = 1 * time.Second |
| defaultTimeout = 15 * time.Second |
| ) |
| |
| // Config for a traffic Generator. |
| type Config struct { |
| // Source of the traffic. |
| Source echo.Caller |
| |
| // Options for generating traffic from the Source to the target. |
| Options echo.CallOptions |
| |
| // Interval between successive call operations. If not set, defaults to 1 second. |
| Interval time.Duration |
| |
| // Maximum time to wait for traffic to complete after stopping. If not set, defaults to 15 seconds. |
| StopTimeout time.Duration |
| } |
| |
| // Generator of traffic between echo instances. Every time interval |
| // (as defined by Config.Interval), a grpc request is sent to the source pod, |
| // causing it to send a request to the destination echo server. Results are |
| // captured for each request for later processing. |
| type Generator interface { |
| // Start sending traffic. |
| Start() Generator |
| |
| // Stop sending traffic and wait for any in-flight requests to complete. |
| // Returns the Result |
| Stop() Result |
| } |
| |
| // NewGenerator returns a new Generator with the given configuration. |
| func NewGenerator(t test.Failer, cfg Config) Generator { |
| fillInDefaults(&cfg) |
| return &generator{ |
| Config: cfg, |
| t: t, |
| stop: make(chan struct{}), |
| stopped: make(chan struct{}), |
| } |
| } |
| |
| var _ Generator = &generator{} |
| |
| type generator struct { |
| Config |
| t test.Failer |
| result Result |
| stop chan struct{} |
| stopped chan struct{} |
| } |
| |
| func (g *generator) Start() Generator { |
| go func() { |
| t := time.NewTimer(g.Interval) |
| for { |
| select { |
| case <-g.stop: |
| t.Stop() |
| close(g.stopped) |
| return |
| case <-t.C: |
| g.result.add(g.Source.Call(g.Options)) |
| t.Reset(g.Interval) |
| } |
| } |
| }() |
| return g |
| } |
| |
| func (g *generator) Stop() Result { |
| // Trigger the generator to stop. |
| close(g.stop) |
| |
| // Wait for the generator to exit. |
| t := time.NewTimer(g.StopTimeout) |
| select { |
| case <-g.stopped: |
| t.Stop() |
| if g.result.TotalRequests == 0 { |
| g.t.Fatal("no requests completed before stopping the traffic generator") |
| } |
| return g.result |
| case <-t.C: |
| g.t.Fatal("timed out waiting for result") |
| } |
| // Can never happen, but the compiler doesn't know that Fatal terminates |
| return Result{} |
| } |
| |
| func fillInDefaults(cfg *Config) { |
| if cfg.Interval == 0 { |
| cfg.Interval = defaultInterval |
| } |
| if cfg.StopTimeout == 0 { |
| cfg.StopTimeout = defaultTimeout |
| } |
| if cfg.Options.Check == nil { |
| cfg.Options.Check = check.OK() |
| } |
| } |