try to replace http2 server

thrau · whummer · commit 833cd59f1838 · 2024-06-20T22:56:11.000+02:00
diff --git a/aws-replicator/aws_replicator/client/auth_proxy.py b/aws-replicator/aws_replicator/client/auth_proxy.py
@@ -5,20 +5,28 @@
 import subprocess
 import sys
 from functools import cache
+from io import BytesIO
 from typing import Dict, Optional, Tuple
 from urllib.parse import urlparse, urlunparse
 
 import boto3
 import requests
-from botocore.awsrequest import AWSPreparedRequest
+from botocore.awsrequest import AWSPreparedRequest, AWSResponse
+from botocore.httpchecksum import resolve_checksum_context
 from botocore.model import OperationModel
 from localstack import config
 from localstack import config as localstack_config
+from localstack.aws.api import HttpRequest
+from localstack.aws.chain import HandlerChain
+from localstack.aws.chain import RequestContext as AwsRequestContext
+from localstack.aws.gateway import Gateway
 from localstack.aws.protocol.parser import create_parser
 from localstack.aws.spec import load_service
 from localstack.config import external_service_url
 from localstack.constants import AWS_REGION_US_EAST_1, DOCKER_IMAGE_NAME_PRO
 from localstack.http import Request
+from localstack.http import Response as HttpResponse
+from localstack.http.hypercorn import GatewayServer
 from localstack.utils.aws.aws_responses import requests_response
 from localstack.utils.bootstrap import setup_logging
 from localstack.utils.collections import select_attributes
@@ -57,6 +65,207 @@
 DEFAULT_BIND_HOST = "127.0.0.1"
 
 
+class AwsProxyHandler:
+    """
+    A handler for an AWS Handler chain that attempts to forward the request using a specific boto3 session.
+    This can be used to proxy incoming requests to real AWS.
+    """
+
+    def __init__(self, session: boto3.Session = None):
+        self.session = session or boto3.Session()
+
+    def __call__(self, chain: HandlerChain, context: AwsRequestContext, response: HttpResponse):
+        # prepare the API invocation parameters
+        LOG.info(
+            "Received %s.%s = %s",
+            context.service.service_name,
+            context.operation.name,
+            context.service_request,
+        )
+
+        # make the actual API call against upstream AWS (will also calculate a new auth signature)
+        try:
+            aws_response = self._make_aws_api_call(context)
+        except Exception:
+            LOG.exception(
+                "Exception while proxying  %s.%s to AWS",
+                context.service.service_name,
+                context.operation.name,
+            )
+            raise
+
+        # tell the handler chain to respond
+        LOG.info(
+            "AWS Response %s.%s: url=%s status_code=%s, headers=%s, content=%s",
+            context.service.service_name,
+            context.operation.name,
+            aws_response.url,
+            aws_response.status_code,
+            aws_response.headers,
+            aws_response.content,
+        )
+        chain.respond(aws_response.status_code, aws_response.content, dict(aws_response.headers))
+
+    def _make_aws_api_call(self, context: AwsRequestContext) -> AWSResponse:
+        # TODO: reconcile with AwsRequestProxy from localstack, and other forwarder tools
+        # create a real AWS client
+        client = self.session.client(context.service.service_name, region_name=context.region)
+        operation_model = context.operation
+
+        # prepare API request parameters as expected by boto
+        api_params = {k: v for k, v in context.service_request.items() if v is not None}
+
+        # this is a stripped down version of botocore's client._make_api_call to immediately get the HTTP
+        # response instead of a parsed response.
+        request_context = {
+            "client_region": client.meta.region_name,
+            "client_config": client.meta.config,
+            "has_streaming_input": operation_model.has_streaming_input,
+            "auth_type": operation_model.auth_type,
+        }
+
+        (
+            endpoint_url,
+            additional_headers,
+            properties,
+        ) = client._resolve_endpoint_ruleset(operation_model, api_params, request_context)
+        if properties:
+            # Pass arbitrary endpoint info with the Request
+            # for use during construction.
+            request_context["endpoint_properties"] = properties
+
+        request_dict = client._convert_to_request_dict(
+            api_params=api_params,
+            operation_model=operation_model,
+            endpoint_url=endpoint_url,
+            context=request_context,
+            headers=additional_headers,
+        )
+        resolve_checksum_context(request_dict, operation_model, api_params)
+
+        if operation_model.has_streaming_input:
+            request_dict["body"] = request_dict["body"].read()
+
+        self._adjust_request_dict(context.service.service_name, request_dict)
+
+        if operation_model.has_streaming_input:
+            request_dict["body"] = BytesIO(request_dict["body"])
+
+        LOG.info("Making AWS request %s", request_dict)
+        http, _ = client._endpoint.make_request(operation_model, request_dict)
+
+        http: AWSResponse
+
+        # for some elusive reasons, these header modifications are needed (were part of http2_server)
+        http.headers.pop("Date", None)
+        http.headers.pop("Server", None)
+        if operation_model.has_streaming_output:
+            http.headers.pop("Content-Length", None)
+
+        return http
+
+    def _adjust_request_dict(self, service_name: str, request_dict: Dict):
+        """Apply minor fixes to the request dict, which seem to be required in the current setup."""
+        # TODO: replacing localstack-specific URLs, IDs, etc, should ideally be done in a more generalized
+        #  way.
+
+        req_body = request_dict.get("body")
+
+        # TODO: fix for switch between path/host addressing
+        # Note: the behavior seems to be different across botocore versions. Seems to be working
+        # with 1.29.97 (fix below not required) whereas newer versions like 1.29.151 require the fix.
+        if service_name == "s3":
+            body_str = run_safe(lambda: to_str(req_body)) or ""
+
+            request_url = request_dict["url"]
+            url_parsed = list(urlparse(request_url))
+            path_parts = url_parsed[2].strip("/").split("/")
+            bucket_subdomain_prefix = f"://{path_parts[0]}.s3."
+            if bucket_subdomain_prefix in request_url:
+                prefix = f"/{path_parts[0]}"
+                url_parsed[2] = url_parsed[2].removeprefix(prefix)
+                request_dict["url_path"] = request_dict["url_path"].removeprefix(prefix)
+                # replace empty path with "/" (seems required for signature calculation)
+                request_dict["url_path"] = request_dict["url_path"] or "/"
+                url_parsed[2] = url_parsed[2] or "/"
+                # re-construct final URL
+                request_dict["url"] = urlunparse(url_parsed)
+
+            # TODO: this custom fix should not be required - investigate and remove!
+            if "<CreateBucketConfiguration" in body_str and "LocationConstraint" not in body_str:
+                region = request_dict["context"]["client_region"]
+                if region == AWS_REGION_US_EAST_1:
+                    request_dict["body"] = ""
+                else:
+                    request_dict["body"] = (
+                        '<CreateBucketConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">'
+                        f"<LocationConstraint>{region}</LocationConstraint></CreateBucketConfiguration>"
+                    )
+
+        if service_name == "sqs" and isinstance(req_body, dict):
+            account_id = self._query_account_id_from_aws()
+            if "QueueUrl" in req_body:
+                queue_name = req_body["QueueUrl"].split("/")[-1]
+                req_body["QueueUrl"] = f"https://queue.amazonaws.com/{account_id}/{queue_name}"
+            if "QueueOwnerAWSAccountId" in req_body:
+                req_body["QueueOwnerAWSAccountId"] = account_id
+        if service_name == "sqs" and request_dict.get("url"):
+            req_json = run_safe(lambda: json.loads(body_str)) or {}
+            account_id = self._query_account_id_from_aws()
+            queue_name = req_json.get("QueueName")
+            if account_id and queue_name:
+                request_dict["url"] = f"https://queue.amazonaws.com/{account_id}/{queue_name}"
+                req_json["QueueOwnerAWSAccountId"] = account_id
+                request_dict["body"] = to_bytes(json.dumps(req_json))
+
+    def _fix_headers(self, request: HttpRequest, service_name: str):
+        if service_name == "s3":
+            # fix the Host header, to avoid bucket addressing issues
+            host = request.headers.get("Host") or ""
+            regex = r"^(https?://)?([0-9.]+|localhost)(:[0-9]+)?"
+            if re.match(regex, host):
+                request.headers["Host"] = re.sub(regex, r"\1s3.localhost.localstack.cloud", host)
+        request.headers.pop("Content-Length", None)
+        request.headers.pop("x-localstack-request-url", None)
+        request.headers.pop("X-Forwarded-For", None)
+        request.headers.pop("X-Localstack-Tgt-Api", None)
+        request.headers.pop("X-Moto-Account-Id", None)
+        request.headers.pop("Remote-Addr", None)
+
+    @cache
+    def _query_account_id_from_aws(self) -> str:
+        sts_client = self.session.client("sts")
+        result = sts_client.get_caller_identity()
+        return result["Account"]
+
+
+class AwsProxyGateway(Gateway):
+    """
+    A handler chain that receives AWS requests, and proxies them transparently to upstream AWS using real
+    credentials. It de-constructs the incoming request, and creates a new request signed with the AWS
+    credentials configured in the environment.
+    """
+
+    def __init__(self) -> None:
+        from localstack.aws import handlers
+
+        super().__init__(
+            request_handlers=[
+                handlers.parse_service_name,
+                handlers.content_decoder,
+                handlers.add_region_from_header,
+                handlers.add_account_id,
+                handlers.parse_service_request,
+                AwsProxyHandler(),
+            ],
+            exception_handlers=[
+                handlers.log_exception,
+                handlers.handle_internal_failure,
+            ],
+            context_class=AwsRequestContext,
+        )
+
+
 class AuthProxyAWS(Server):
     def __init__(self, config: ProxyConfig, port: int = None):
         self.config = config
@@ -65,9 +274,13 @@ def __init__(self, config: ProxyConfig, port: int = None):
 
     def do_run(self):
         self.register_in_instance()
+
         bind_host = self.config.get("bind_host") or DEFAULT_BIND_HOST
-        proxy = run_server(port=self.port, bind_addresses=[bind_host], handler=self.proxy_request)
-        proxy.join()
+        srv = GatewayServer(AwsProxyGateway(), localstack_config.HostAndPort(bind_host, self.port))
+        srv.start()
+        srv.join()
+        # proxy = run_server(port=self.port, bind_addresses=[bind_host], handler=self.proxy_request)
+        # proxy.join()
 
     def proxy_request(self, request: Request, data: bytes) -> Response:
         parsed = self._extract_region_and_service(request.headers)
@@ -214,20 +427,23 @@ def _parse_aws_request(
 
     def _adjust_request_dict(self, service_name: str, request_dict: Dict):
         """Apply minor fixes to the request dict, which seem to be required in the current setup."""
-
+        # TODO: replacing localstack-specific URLs, IDs, etc, should ideally be done in a more generalized
+        #  way.
         req_body = request_dict.get("body")
-        body_str = run_safe(lambda: to_str(req_body)) or ""
-
-        # TODO: this custom fix should not be required - investigate and remove!
-        if "<CreateBucketConfiguration" in body_str and "LocationConstraint" not in body_str:
-            region = request_dict["context"]["client_region"]
-            if region == AWS_REGION_US_EAST_1:
-                request_dict["body"] = ""
-            else:
-                request_dict["body"] = (
-                    '<CreateBucketConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">'
-                    f"<LocationConstraint>{region}</LocationConstraint></CreateBucketConfiguration>"
-                )
+
+        if service_name == "s3":
+            body_str = run_safe(lambda: to_str(req_body)) or ""
+
+            # TODO: this custom fix should not be required - investigate and remove!
+            if "<CreateBucketConfiguration" in body_str and "LocationConstraint" not in body_str:
+                region = request_dict["context"]["client_region"]
+                if region == AWS_REGION_US_EAST_1:
+                    request_dict["body"] = ""
+                else:
+                    request_dict["body"] = (
+                        '<CreateBucketConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">'
+                        f"<LocationConstraint>{region}</LocationConstraint></CreateBucketConfiguration>"
+                    )
 
         if service_name == "sqs" and isinstance(req_body, dict):
             account_id = self._query_account_id_from_aws()
diff --git a/aws-replicator/aws_replicator/server/aws_request_forwarder.py b/aws-replicator/aws_replicator/server/aws_request_forwarder.py
@@ -16,6 +16,7 @@
 from localstack.utils.net import get_addressable_container_host
 from localstack.utils.strings import to_str, truncate
 from requests.structures import CaseInsensitiveDict
+from rolo.proxy import forward
 
 try:
     from localstack.testing.config import TEST_AWS_ACCESS_KEY_ID
@@ -37,17 +38,21 @@ def __call__(self, chain: HandlerChain, context: RequestContext, response: Respo
             return
 
         # forward request to proxy
-        response = self.forward_request(context, proxy)
+        response_ = self.forward_request(context, proxy)
 
-        if response is None:
+        if response_ is None:
             return
 
-        # set response details, then stop handler chain to return response
-        chain.response.data = response.raw_content
-        chain.response.status_code = response.status_code
-        chain.response.headers.update(dict(response.headers))
+        response.update_from(response_)
         chain.stop()
 
+        # set response details, then stop handler chain to return response
+        # chain.response.data = response.raw_content
+        # chain.response.status_code = response.status_code
+        # chain.response.headers.update(dict(response.headers))
+        # chain.stop()
+        # chain.respond(response.status_code, response.raw_content, dict(response.headers))
+
     def select_proxy(self, context: RequestContext) -> Optional[ProxyInstance]:
         """select a proxy responsible to forward a request to real AWS"""
         if not context.service:
@@ -126,6 +131,22 @@ def forward_request(self, context: RequestContext, proxy: ProxyInstance) -> requ
         port = proxy["port"]
         request = context.request
         target_host = get_addressable_container_host(default_local_hostname=LOCALHOST)
+
+        try:
+            LOG.info("Forwarding request: %s", context)
+            response = forward(request, f"http://{target_host}:{port}")
+            LOG.info(
+                "Received response: status=%s headers=%s body=%s",
+                response.status_code,
+                response.headers,
+                response.data,
+            )
+        except Exception as e:
+            LOG.exception("Exception while forwarding request")
+            raise
+
+        return response
+
         url = f"http://{target_host}:{port}{request.path}?{to_str(request.query_string)}"
 
         # inject Auth header, to ensure we're passing the right region to the proxy (e.g., for Cognito InitiateAuth)
@@ -156,9 +177,9 @@ def forward_request(self, context: RequestContext, proxy: ProxyInstance) -> requ
                 dict(result.headers),
                 truncate(result.raw_content, max_length=500),
             )
-        except requests.exceptions.ConnectionError:
+        except requests.exceptions.ConnectionError as e:
             # remove unreachable proxy
-            LOG.info("Removing unreachable AWS forward proxy due to connection issue: %s", url)
+            LOG.exception("Removing unreachable AWS forward proxy due to connection issue: %s", url)
             self.PROXY_INSTANCES.pop(port, None)
         return result
 
diff --git a/aws-replicator/aws_replicator/server/extension.py b/aws-replicator/aws_replicator/server/extension.py
@@ -12,6 +12,10 @@ class AwsReplicatorExtension(Extension):
     name = "aws-replicator"
 
     def on_extension_load(self):
+        logging.getLogger("aws_replicator").setLevel(
+            logging.DEBUG if config.DEBUG else logging.INFO
+        )
+
         if config.GATEWAY_SERVER == "twisted":
             LOG.warning(
                 "AWS resource replicator: The aws-replicator extension currently requires hypercorn as "
