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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package delayedDeleter | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/kneu-messenger-pigeon/client-framework/delayedDeleter/contracts" | ||
| "github.com/redis/go-redis/v9" | ||
| "google.golang.org/protobuf/proto" | ||
| "io" | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| const defaultWaitingTimeout = time.Minute | ||
|
|
||
| type Deleter struct { | ||
| handler contracts.DeleteHandlerInterface | ||
| redis redis.UniversalClient | ||
| out io.Writer | ||
| queueName string | ||
| waitingTimeout time.Duration | ||
| } | ||
|
|
||
| func NewWelcomeAnonymousMessageDelayedDeleter(redis redis.UniversalClient, out io.Writer, name string) *Deleter { | ||
| return &Deleter{ | ||
| redis: redis, | ||
| out: out, | ||
| queueName: "deleter_queue_" + name, | ||
| waitingTimeout: defaultWaitingTimeout, | ||
| } | ||
| } | ||
|
|
||
| func (deleter *Deleter) AddToQueue(messageDeleteTask *contracts.DeleteTask) { | ||
| taskSerialized, _ := proto.Marshal(messageDeleteTask) | ||
| err := deleter.redis.LPush(context.Background(), deleter.queueName, taskSerialized).Err() | ||
| deleter.logError("failed write task to redis queue: ", err) | ||
| } | ||
|
|
||
| func (deleter *Deleter) SetHandler(handler contracts.DeleteHandlerInterface) { | ||
| deleter.handler = handler | ||
| } | ||
|
|
||
| func (deleter *Deleter) Execute(ctx context.Context, wg *sync.WaitGroup) { | ||
| var waitTime time.Duration | ||
| var now int64 | ||
| var nextTask contracts.DeleteTask | ||
| var taskSerialized []byte | ||
| var nextTasksSerialized []string | ||
| var unmarshalErr error | ||
| var handlerErr error | ||
| var dequeueErr error | ||
|
|
||
| dequeue := func() { | ||
| dequeueErr = deleter.redis.RPop(context.Background(), deleter.queueName).Err() | ||
| deleter.logError("failed dequeue task: ", dequeueErr) | ||
| } | ||
|
|
||
| var readNextTask func() | ||
| readNextTask = func() { | ||
| nextTask.Reset() | ||
| nextTasksSerialized = deleter.redis.LRange(context.Background(), deleter.queueName, -1, -1).Val() | ||
| if len(nextTasksSerialized) > 0 { | ||
| taskSerialized = []byte(nextTasksSerialized[0]) | ||
| unmarshalErr = proto.Unmarshal(taskSerialized, &nextTask) | ||
| if unmarshalErr != nil { | ||
| _, _ = fmt.Fprintln(deleter.out, "failed unmarshal task: ", unmarshalErr) | ||
| dequeue() | ||
| readNextTask() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| for { | ||
| now = time.Now().Unix() | ||
| readNextTask() | ||
| for nextTask.GetScheduledAt() != 0 && nextTask.GetScheduledAt() <= now { | ||
| handlerErr = deleter.handler.HandleDeleteTask(&nextTask) | ||
| deleter.logError("handle delete message err: ", handlerErr) | ||
| dequeue() | ||
| readNextTask() | ||
| } | ||
|
|
||
| if nextTask.ScheduledAt > now { | ||
| waitTime = time.Duration(nextTask.GetScheduledAt()-now) * time.Second | ||
| } else { | ||
| waitTime = deleter.waitingTimeout | ||
| } | ||
|
|
||
| select { | ||
| case <-ctx.Done(): | ||
|
|
||
| wg.Done() | ||
| return | ||
| case <-time.After(waitTime): | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (deleter *Deleter) logError(prefix string, err error) { | ||
| if err != nil { | ||
| _, _ = fmt.Fprintln(deleter.out, prefix, err) | ||
| } | ||
| } |
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