feat: add lambda streaming support for remote invoke

requirements/base.txt

@@ -1,8 +1,8 @@
 chevron~=0.12
 click~=8.0
 Flask<2.3
-#Need to add Schemas latest SDK.
-boto3>=1.19.5,==1.*
+#Need to add latest lambda changes which will return invoke mode details
+boto3>=1.26.109,==1.*
 jmespath~=1.0.1
 ruamel_yaml~=0.17.21
 PyYAML>=5.4.1,==5.*

samcli/lib/remote_invoke/lambda_invoke_executors.py

@@ -4,9 +4,11 @@
 import base64
 import json
 import logging
+from abc import ABC, abstractmethod
 from json import JSONDecodeError
-from typing import Any, Dict, cast
+from typing import Any, cast
 
+from botocore.eventstream import EventStream
 from botocore.exceptions import ClientError, ParamValidationError
 from botocore.response import StreamingBody
 
@@ -26,12 +28,19 @@
 LOG = logging.getLogger(__name__)
 FUNCTION_NAME = "FunctionName"
 PAYLOAD = "Payload"
+EVENT_STREAM = "EventStream"
+PAYLOAD_CHUNK = "PayloadChunk"
+INVOKE_COMPLETE = "InvokeComplete"
+LOG_RESULT = "LogResult"
 
+INVOKE_MODE = "InvokeMode"
+RESPONSE_STREAM = "RESPONSE_STREAM"
 
-class LambdaInvokeExecutor(BotoActionExecutor):
+
+class AbstractLambdaInvokeExecutor(BotoActionExecutor, ABC):
     """
-    Calls "invoke" method of "lambda" service with given input.
-    If a file location provided, the file handle will be passed as Payload object
+    Abstract class for different lambda invocation executors, see implementation for details.
+    For Payload parameter, if a file location provided, the file handle will be passed as Payload object
     """
 
     _lambda_client: Any
@@ -59,14 +68,9 @@ def validate_action_parameters(self, parameters: dict) -> None:
     def _execute_action(self, payload: str):
         self.request_parameters[FUNCTION_NAME] = self._function_name
         self.request_parameters[PAYLOAD] = payload
-        LOG.debug(
-            "Calling lambda_client.invoke with FunctionName:%s, Payload:%s, parameters:%s",
-            self._function_name,
-            payload,
-            self.request_parameters,
-        )
+
         try:
-            response = self._lambda_client.invoke(**self.request_parameters)
+            return self._execute_lambda_invoke(payload)
         except ParamValidationError as param_val_ex:
             raise InvalidResourceBotoParameterException(
                 f"Invalid parameter key provided."
@@ -80,7 +84,40 @@ def _execute_action(self, payload: str):
             elif boto_utils.get_client_error_code(client_ex) == "InvalidRequestContentException":
                 raise InvalidResourceBotoParameterException(client_ex) from client_ex
             raise ErrorBotoApiCallException(client_ex) from client_ex
-        return response
+
+    @abstractmethod
+    def _execute_lambda_invoke(self, payload: str):
+        pass
+
+
+class LambdaInvokeExecutor(AbstractLambdaInvokeExecutor):
+    """
+    Calls "invoke" method of "lambda" service with given input.
+    """
+
+    def _execute_lambda_invoke(self, payload: str) -> dict:
+        LOG.debug(
+            "Calling lambda_client.invoke with FunctionName:%s, Payload:%s, parameters:%s",
+            self._function_name,
+            payload,
+            self.request_parameters,
+        )
+        return cast(dict, self._lambda_client.invoke(**self.request_parameters))
+
+
+class LambdaInvokeWithResponseStreamExecutor(AbstractLambdaInvokeExecutor):
+    """
+    Calls "invoke_with_response_stream" method of "lambda" service with given input.
+    """
+
+    def _execute_lambda_invoke(self, payload: str) -> dict:
+        LOG.debug(
+            "Calling lambda_client.invoke_with_response_stream with FunctionName:%s, Payload:%s, parameters:%s",
+            self._function_name,
+            payload,
+            self.request_parameters,
+        )
+        return cast(dict, self._lambda_client.invoke_with_response_stream(**self.request_parameters))
 
 
 class DefaultConvertToJSON(RemoteInvokeRequestResponseMapper):
@@ -124,6 +161,31 @@ def map(self, remote_invoke_input: RemoteInvokeExecutionInfo) -> RemoteInvokeExe
         return remote_invoke_input
 
 
+class LambdaStreamResponseConverter(RemoteInvokeRequestResponseMapper):
+    """
+    This class helps to convert response from lambda invoke_with_response_stream API call.
+    That API call returns 'EventStream' which yields 'PayloadChunk's and 'InvokeComplete' as they become available.
+    This mapper, gets all 'PayloadChunk's and 'InvokeComplete' events and decodes them for next mapper.
+    """
+
+    def map(self, remote_invoke_input: RemoteInvokeExecutionInfo) -> RemoteInvokeExecutionInfo:
+        LOG.debug("Mapping Lambda response to string object")
+        if not isinstance(remote_invoke_input.response, dict):
+            raise InvalideBotoResponseException("Invalid response type received from Lambda service, expecting dict")
+
+        event_stream: EventStream = remote_invoke_input.response.get(EVENT_STREAM, [])
+        decoded_event_stream = []
+        for event in event_stream:
+            if PAYLOAD_CHUNK in event:
+                decoded_payload_chunk = event.get(PAYLOAD_CHUNK).get(PAYLOAD).decode("utf-8")
+                decoded_event_stream.append({PAYLOAD_CHUNK: {PAYLOAD: decoded_payload_chunk}})
+            if INVOKE_COMPLETE in event:
+                log_output = event.get(INVOKE_COMPLETE).get(LOG_RESULT, b"")
+                decoded_event_stream.append({INVOKE_COMPLETE: {LOG_RESULT: log_output}})
+        remote_invoke_input.response[EVENT_STREAM] = decoded_event_stream
+        return remote_invoke_input
+
+
 class LambdaResponseOutputFormatter(RemoteInvokeRequestResponseMapper):
     """
     This class helps to format output response for lambda service that will be printed on the CLI.
@@ -139,8 +201,8 @@ def map(self, remote_invoke_input: RemoteInvokeExecutionInfo) -> RemoteInvokeExe
         """
         if remote_invoke_input.output_format == RemoteInvokeOutputFormat.DEFAULT:
             LOG.debug("Formatting Lambda output response")
-            boto_response = cast(Dict, remote_invoke_input.response)
-            log_field = boto_response.get("LogResult")
+            boto_response = cast(dict, remote_invoke_input.response)
+            log_field = boto_response.get(LOG_RESULT)
             if log_field:
                 log_result = base64.b64decode(log_field).decode("utf-8")
                 remote_invoke_input.log_output = log_result
@@ -152,3 +214,45 @@ def map(self, remote_invoke_input: RemoteInvokeExecutionInfo) -> RemoteInvokeExe
                 remote_invoke_input.response = boto_response.get(PAYLOAD)
 
         return remote_invoke_input
+
+
+class LambdaStreamResponseOutputFormatter(RemoteInvokeRequestResponseMapper):
+    """
+    This class helps to format streaming output response for lambda service that will be printed on the CLI.
+    It loops through EventStream elements and adds them to response, and once InvokeComplete is reached, it updates
+    log_output and response objects in remote_invoke_input.
+    """
+
+    def map(self, remote_invoke_input: RemoteInvokeExecutionInfo) -> RemoteInvokeExecutionInfo:
+        """
+        Maps the lambda response output to the type of output format specified as user input.
+        If output_format is original-boto-response, write the original boto API response
+        to stdout.
+        """
+        if remote_invoke_input.output_format == RemoteInvokeOutputFormat.DEFAULT:
+            LOG.debug("Formatting Lambda output response")
+            boto_response = cast(dict, remote_invoke_input.response)
+            combined_response = ""
+            for event in boto_response.get(EVENT_STREAM, []):
+                if PAYLOAD_CHUNK in event:
+                    payload_chunk = event.get(PAYLOAD_CHUNK).get(PAYLOAD)
+                    combined_response = f"{combined_response}{payload_chunk}"
+                if INVOKE_COMPLETE in event:
+                    log_result = base64.b64decode(event.get(INVOKE_COMPLETE).get(LOG_RESULT)).decode("utf-8")
+                    remote_invoke_input.log_output = log_result
+            remote_invoke_input.response = combined_response
+        return remote_invoke_input
+
+
+def _is_function_invoke_mode_response_stream(lambda_client: Any, function_name: str):
+    """
+    Returns True if given function has RESPONSE_STREAM as InvokeMode, False otherwise
+    """
+    try:
+        function_url_config = lambda_client.get_function_url_config(FunctionName=function_name)
+        function_invoke_mode = function_url_config.get(INVOKE_MODE)
+        LOG.debug("InvokeMode of function %s: %s", function_name, function_invoke_mode)
+        return function_invoke_mode == RESPONSE_STREAM
+    except ClientError as ex:
+        LOG.debug("Function %s, doesn't have Function URL configured, using regular invoke", function_name, exc_info=ex)
+        return False

samcli/lib/remote_invoke/remote_invoke_executor_factory.py

@@ -7,8 +7,12 @@
 from samcli.lib.remote_invoke.lambda_invoke_executors import (
     DefaultConvertToJSON,
     LambdaInvokeExecutor,
+    LambdaInvokeWithResponseStreamExecutor,
     LambdaResponseConverter,
     LambdaResponseOutputFormatter,
+    LambdaStreamResponseConverter,
+    LambdaStreamResponseOutputFormatter,
+    _is_function_invoke_mode_response_stream,
 )
 from samcli.lib.remote_invoke.remote_invoke_executors import RemoteInvokeExecutor, ResponseObjectToJsonStringMapper
 from samcli.lib.utils.cloudformation import CloudFormationResourceSummary
@@ -64,6 +68,22 @@ def _create_lambda_boto_executor(self, cfn_resource_summary: CloudFormationResou
 
         :return: Returns the created remote invoke Executor
         """
+        lambda_client = self._boto_client_provider("lambda")
+        if _is_function_invoke_mode_response_stream(lambda_client, cfn_resource_summary.physical_resource_id):
+            LOG.debug("Creating response stream invocator for function %s", cfn_resource_summary.physical_resource_id)
+            return RemoteInvokeExecutor(
+                request_mappers=[DefaultConvertToJSON()],
+                response_mappers=[
+                    LambdaStreamResponseConverter(),
+                    LambdaStreamResponseOutputFormatter(),
+                    ResponseObjectToJsonStringMapper(),
+                ],
+                boto_action_executor=LambdaInvokeWithResponseStreamExecutor(
+                    lambda_client,
+                    cfn_resource_summary.physical_resource_id,
+                ),
+            )
+
         return RemoteInvokeExecutor(
             request_mappers=[DefaultConvertToJSON()],
             response_mappers=[
@@ -72,7 +92,7 @@ def _create_lambda_boto_executor(self, cfn_resource_summary: CloudFormationResou
                 ResponseObjectToJsonStringMapper(),
             ],
             boto_action_executor=LambdaInvokeExecutor(
-                self._boto_client_provider("lambda"),
+                lambda_client,
                 cfn_resource_summary.physical_resource_id,
             ),
         )