Use new spawn protocol version

protobuf/eigr/functions/protocol/actors/protocol.proto

@@ -407,6 +407,8 @@ message ActorInvocationResponse {
     }
 
     Workflow workflow = 5;
+
+    bool checkpoint = 7;
 }
 
 // InvocationResponse is the response that the proxy that received the InvocationRequest request will forward to the request's original user function.

protobuf/eigr/functions/protocol/actors/state.proto

@@ -0,0 +1,28 @@
+// The Spawn State Extension Protocol
+//
+//
+syntax = "proto3";
+
+package eigr.functions.protocol.state;
+
+import "eigr/functions/protocol/actors/actor.proto";
+
+option java_package = "io.eigr.functions.protocol.state";
+option go_package = "github.com/eigr/go-support/eigr/protocol/state;state";
+
+// A revision is just a version number for a record in the snapshot table that stores the actors' state.
+// When an actor has its snaphost timeout, it increments its internal revision number and saves it along with its internal data.
+// Some of the persistence adapters can use this revision number to find the state of an Actor at a given point in time.
+// As Actors in Spawn persist their internal data as snapshots from time to time a revision number may not indicate the state of a given change 
+// but will most likely point to the exact time that a given actor's internal state was persisted into the database.
+message Revision {
+    int64 value = 1;
+}
+
+// A checkpoint encapsulates a revision and the state it represents.
+message Checkpoint {
+
+    Revision revision = 1;
+
+    eigr.functions.protocol.actors.ActorState state = 2;
+}

scripts/compile-pb.sh

@@ -5,7 +5,8 @@ set -o errexit
 set -o pipefail
 
 # follow the basic steps here: https://grpc.io/docs/tutorials/basic/python/
-#protoc -I ../protobuf/ --python_out=../spawn eigr/functions/protocol/actors/actor.proto
-#protoc -I ../protobuf/ --python_out=../spawn eigr/functions/protocol/actors/protocol.proto
+protoc -I ../protobuf/ --python_out=../spawn eigr/functions/protocol/actors/actor.proto
+protoc -I ../protobuf/ --python_out=../spawn eigr/functions/protocol/actors/protocol.proto
+protoc -I ../protobuf/ --python_out=../spawn eigr/functions/protocol/actors/state.proto
 
 protoc -I ../example/protobuf/ --python_out=../example ../example/protobuf/domain/domain.proto

spawn/eigr/functions/actors/api/value.py

@@ -27,6 +27,7 @@ class Value():
     __forward: Forward = None
     __pipe: Pipe = None
     __reply_kind: ReplyKind = ReplyKind.REPLY
+    __checkpoint: bool = False
 
     def get_state(self):
         return self.__state
@@ -55,6 +56,9 @@ def get_pipe(self):
     def get_reply_kind(self):
         return self.__reply_kind
 
+    def has_checkpoint(self):
+        return self.__checkpoint
+
     def of(self, value, state=None):
         self.__response = value
         self.__state = state
@@ -96,10 +100,12 @@ def pipe(self, pipe: Pipe):
         self.__pipe = pipe
         return self
 
-    def reply(self):
+    def reply(self, checkpoint: bool = False):
         self.__reply_kind = ReplyKind.REPLY
+        self.__checkpoint = checkpoint
         return self
 
-    def noreply(self):
+    def noreply(self, checkpoint: bool = False):
         self.__reply_kind = ReplyKind.NO_REPLY
+        self.__checkpoint = checkpoint
         return self

spawn/eigr/functions/actors/internal/controller.py

@@ -127,6 +127,9 @@ def handle_response(system, actor_name, result):
         pipe.action_name = p.action
         actor_invocation_response.workflow.pipe.CopyFrom(pipe)
 
+    if result.has_checkpoint():
+        actor_invocation_response.checkpoint = True
+
     return actor_invocation_response