use go module for dependencies (#594)

appservice/types/types.go

@@ -0,0 +1,64 @@
+// 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 types
+
+import (
+	"sync"
+
+	"github.com/matrix-org/dendrite/common/config"
+)
+
+const (
+	// AppServiceDeviceID is the AS dummy device ID
+	AppServiceDeviceID = "AS_Device"
+)
+
+// ApplicationServiceWorkerState is a type that couples an application service,
+// a lockable condition as well as some other state variables, allowing the
+// roomserver to notify appservice workers when there are events ready to send
+// externally to application services.
+type ApplicationServiceWorkerState struct {
+	AppService config.ApplicationService
+	Cond       *sync.Cond
+	// Events ready to be sent
+	EventsReady bool
+	// Backoff exponent (2^x secs). Max 6, aka 64s.
+	Backoff int
+}
+
+// NotifyNewEvents wakes up all waiting goroutines, notifying that events remain
+// in the event queue for this application service worker.
+func (a *ApplicationServiceWorkerState) NotifyNewEvents() {
+	a.Cond.L.Lock()
+	a.EventsReady = true
+	a.Cond.Broadcast()
+	a.Cond.L.Unlock()
+}
+
+// FinishEventProcessing marks all events of this worker as being sent to the
+// application service.
+func (a *ApplicationServiceWorkerState) FinishEventProcessing() {
+	a.Cond.L.Lock()
+	a.EventsReady = false
+	a.Cond.L.Unlock()
+}
+
+// WaitForNewEvents causes the calling goroutine to wait on the worker state's
+// condition for a broadcast or similar wakeup, if there are no events ready.
+func (a *ApplicationServiceWorkerState) WaitForNewEvents() {
+	a.Cond.L.Lock()
+	if !a.EventsReady {
+		a.Cond.Wait()
+	}
+	a.Cond.L.Unlock()
+}