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-rw-r--r--synapse/config/server.py13
-rw-r--r--synapse/http/site.py14
2 files changed, 23 insertions, 4 deletions
diff --git a/synapse/config/server.py b/synapse/config/server.py
index c91df636d9..f2353ce5fb 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -206,6 +206,7 @@ class HttpListenerConfig:
     resources: List[HttpResourceConfig] = attr.Factory(list)
     additional_resources: Dict[str, dict] = attr.Factory(dict)
     tag: Optional[str] = None
+    request_id_header: Optional[str] = None
 
 
 @attr.s(slots=True, frozen=True, auto_attribs=True)
@@ -520,9 +521,11 @@ class ServerConfig(Config):
         ):
             raise ConfigError("allowed_avatar_mimetypes must be a list")
 
-        self.listeners = [
-            parse_listener_def(i, x) for i, x in enumerate(config.get("listeners", []))
-        ]
+        listeners = config.get("listeners", [])
+        if not isinstance(listeners, list):
+            raise ConfigError("Expected a list", ("listeners",))
+
+        self.listeners = [parse_listener_def(i, x) for i, x in enumerate(listeners)]
 
         # no_tls is not really supported any more, but let's grandfather it in
         # here.
@@ -889,6 +892,9 @@ def read_gc_thresholds(
 
 def parse_listener_def(num: int, listener: Any) -> ListenerConfig:
     """parse a listener config from the config file"""
+    if not isinstance(listener, dict):
+        raise ConfigError("Expected a dictionary", ("listeners", str(num)))
+
     listener_type = listener["type"]
     # Raise a helpful error if direct TCP replication is still configured.
     if listener_type == "replication":
@@ -928,6 +934,7 @@ def parse_listener_def(num: int, listener: Any) -> ListenerConfig:
             resources=resources,
             additional_resources=listener.get("additional_resources", {}),
             tag=listener.get("tag"),
+            request_id_header=listener.get("request_id_header"),
         )
 
     return ListenerConfig(port, bind_addresses, listener_type, tls, http_config)
diff --git a/synapse/http/site.py b/synapse/http/site.py
index 1155f3f610..55a6afce35 100644
--- a/synapse/http/site.py
+++ b/synapse/http/site.py
@@ -72,10 +72,12 @@ class SynapseRequest(Request):
         site: "SynapseSite",
         *args: Any,
         max_request_body_size: int = 1024,
+        request_id_header: Optional[str] = None,
         **kw: Any,
     ):
         super().__init__(channel, *args, **kw)
         self._max_request_body_size = max_request_body_size
+        self.request_id_header = request_id_header
         self.synapse_site = site
         self.reactor = site.reactor
         self._channel = channel  # this is used by the tests
@@ -172,7 +174,14 @@ class SynapseRequest(Request):
         self._opentracing_span = span
 
     def get_request_id(self) -> str:
-        return "%s-%i" % (self.get_method(), self.request_seq)
+        request_id_value = None
+        if self.request_id_header:
+            request_id_value = self.getHeader(self.request_id_header)
+
+        if request_id_value is None:
+            request_id_value = str(self.request_seq)
+
+        return "%s-%s" % (self.get_method(), request_id_value)
 
     def get_redacted_uri(self) -> str:
         """Gets the redacted URI associated with the request (or placeholder if the URI
@@ -611,12 +620,15 @@ class SynapseSite(Site):
         proxied = config.http_options.x_forwarded
         request_class = XForwardedForRequest if proxied else SynapseRequest
 
+        request_id_header = config.http_options.request_id_header
+
         def request_factory(channel: HTTPChannel, queued: bool) -> Request:
             return request_class(
                 channel,
                 self,
                 max_request_body_size=max_request_body_size,
                 queued=queued,
+                request_id_header=request_id_header,
             )
 
         self.requestFactory = request_factory  # type: ignore