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feat(file-with-console): updated code based to broadcast and write it… (
#60) * feat(file-with-console): updated code base to broadcast and write it to file in JSON format as well as console
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /* | ||
| * Copyright 2023 American Express | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| /* | ||
| * Broadcast package is used to create multiple channel reader. | ||
| * Since once we read data from channel, it empties out it self. | ||
| * this package provides a way to broadcast the data and assign listern to that data. | ||
| */ | ||
| package broadcast | ||
|
|
||
| import ( | ||
| "context" | ||
| "github.com/americanexpress/earlybird/pkg/scan" | ||
| ) | ||
|
|
||
| type BroadcastServer interface { | ||
| Subscribe() <-chan scan.Hit | ||
| CancelSubscription(<-chan scan.Hit) | ||
| } | ||
|
|
||
| type broadcastServer struct { | ||
| source <-chan scan.Hit | ||
| listeners []chan scan.Hit | ||
| addListener chan chan scan.Hit | ||
| removeListener chan (<-chan scan.Hit) | ||
| } | ||
|
|
||
| // Subscribe() creates a subcribtion on broadcastServer. | ||
| func (s *broadcastServer) Subscribe() <-chan scan.Hit { | ||
| newListener := make(chan scan.Hit) | ||
| s.addListener <- newListener | ||
| return newListener | ||
| } | ||
|
|
||
| // CancelSubscription() cancel a subcribtion on broadcastServer. | ||
| func (s *broadcastServer) CancelSubscription(channel <-chan scan.Hit) { | ||
| s.removeListener <- channel | ||
| } | ||
|
|
||
| // NewBroadcastServer() create a broadcast server and starts new routine. | ||
| func NewBroadcastServer(ctx context.Context, source <-chan scan.Hit) BroadcastServer { | ||
| service := &broadcastServer{ | ||
| source: source, | ||
| listeners: make([]chan scan.Hit, 0), | ||
| addListener: make(chan chan scan.Hit), | ||
| removeListener: make(chan (<-chan scan.Hit)), | ||
| } | ||
| go service.serve(ctx) | ||
| return service | ||
| } | ||
|
|
||
| // serve() run the server and manages listener counts. | ||
| func (s *broadcastServer) serve(ctx context.Context) { | ||
| defer func() { | ||
| for _, listener := range s.listeners { | ||
| if listener != nil { | ||
| close(listener) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case newListener := <-s.addListener: | ||
| s.listeners = append(s.listeners, newListener) | ||
| case listenerToRemove := <-s.removeListener: | ||
| for i, ch := range s.listeners { | ||
| if ch == listenerToRemove { | ||
| s.listeners[i] = s.listeners[len(s.listeners)-1] | ||
| s.listeners = s.listeners[:len(s.listeners)-1] | ||
| close(ch) | ||
| break | ||
| } | ||
| } | ||
| case val, ok := <-s.source: | ||
| if !ok { | ||
| return | ||
| } | ||
| for _, listener := range s.listeners { | ||
| if listener != nil { | ||
| select { | ||
| case listener <- val: | ||
| case <-ctx.Done(): | ||
| return | ||
| } | ||
|
|
||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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