feat: service bus message settlement support

.flake8

@@ -6,6 +6,7 @@
 ignore = W503,E402,E731
 
 exclude = .git, __pycache__, build, dist, .eggs, .github, .local, docs/,
-          Samples, .env*, .vscode, venv*, *.venv*
+          Samples, .env*, .vscode, venv*, *.venv*,
+          azurefunctions-extensions-bindings-servicebus/azurefunctions/extensions/bindings/protos,
 
 max-line-length = 88

azurefunctions-extensions-bindings-servicebus/azurefunctions/extensions/bindings/protos/__init__.py

@@ -0,0 +1,2 @@
+#  Copyright (c) Microsoft Corporation. All rights reserved.
+#  Licensed under the MIT License.

azurefunctions-extensions-bindings-servicebus/azurefunctions/extensions/bindings/protos/settlement.proto

@@ -0,0 +1,99 @@
+syntax = "proto3";
+
+import "google/protobuf/empty.proto";
+import "google/protobuf/wrappers.proto";
+import "google/protobuf/timestamp.proto";
+
+// this namespace will be shared between isolated worker and WebJobs extension so make it somewhat generic
+option csharp_namespace = "Microsoft.Azure.ServiceBus.Grpc";
+
+// The settlement service definition.
+service Settlement {
+  // Completes a message
+  rpc Complete (CompleteRequest) returns (google.protobuf.Empty) {}
+
+  // Abandons a message
+  rpc Abandon (AbandonRequest) returns (google.protobuf.Empty) {}
+
+  // Deadletters a message
+  rpc Deadletter (DeadletterRequest) returns (google.protobuf.Empty) {}
+
+  // Defers a message
+  rpc Defer (DeferRequest) returns (google.protobuf.Empty) {}
+
+  // Renew message lock
+  rpc RenewMessageLock (RenewMessageLockRequest) returns (google.protobuf.Empty) {}
+
+  // Get session state
+  rpc GetSessionState (GetSessionStateRequest) returns (GetSessionStateResponse) {}
+
+  // Set session state
+  rpc SetSessionState (SetSessionStateRequest) returns (google.protobuf.Empty) {}
+
+  // Release session
+  rpc ReleaseSession (ReleaseSessionRequest) returns (google.protobuf.Empty) {}
+
+  // Renew session lock
+  rpc RenewSessionLock (RenewSessionLockRequest) returns (RenewSessionLockResponse) {}
+}
+
+// The complete message request containing the locktoken.
+message CompleteRequest {
+  string locktoken = 1;
+}
+
+// The abandon message request containing the locktoken and properties to modify.
+message AbandonRequest {
+  string locktoken = 1;
+  bytes propertiesToModify = 2;
+}
+
+// The deadletter message request containing the locktoken and properties to modify along with the reason/description.
+message DeadletterRequest {
+  string locktoken = 1;
+  bytes propertiesToModify = 2;
+  google.protobuf.StringValue deadletterReason = 3;
+  google.protobuf.StringValue deadletterErrorDescription = 4;
+}
+
+// The defer message request containing the locktoken and properties to modify.
+message DeferRequest {
+  string locktoken = 1;
+  bytes propertiesToModify = 2;
+}
+
+// The renew message lock request containing the locktoken.
+message RenewMessageLockRequest {
+  string locktoken = 1;
+}
+
+// The get message request.
+message GetSessionStateRequest {
+  string sessionId = 1;
+}
+
+// The set message request.
+message SetSessionStateRequest {
+  string sessionId = 1;
+  bytes sessionState = 2;
+}
+
+// Get response containing the session state.
+message GetSessionStateResponse {
+  bytes sessionState = 1;
+}
+
+// Release session.
+message ReleaseSessionRequest {
+  string sessionId = 1;
+}
+
+// Renew session lock.
+message RenewSessionLockRequest {
+  string sessionId = 1;
+}
+
+// Renew session lock.
+message RenewSessionLockResponse {
+  google.protobuf.Timestamp lockedUntil = 1;
+}