Correctly handle errors doing requests to group servers

synapse/handlers/groups_local.py

@@ -126,9 +126,12 @@ class GroupsLocalHandler(object):
                 group_id, requester_user_id
             )
         else:
+            try:
                 res = yield self.transport_client.get_group_summary(
                     get_domain_from_id(group_id), group_id, requester_user_id
                 )
+            except RequestSendFailed:
+                raise SynapseError(502, "Failed to contact group server")
 
             group_server_name = get_domain_from_id(group_id)
 
@@ -183,9 +186,12 @@ class GroupsLocalHandler(object):
 
             content["user_profile"] = yield self.profile_handler.get_profile(user_id)
 
+            try:
                 res = yield self.transport_client.create_group(
                     get_domain_from_id(group_id), group_id, user_id, content
                 )
+            except RequestSendFailed:
+                raise SynapseError(502, "Failed to contact group server")
 
             remote_attestation = res["attestation"]
             yield self.attestations.verify_attestation(
@@ -221,9 +227,12 @@ class GroupsLocalHandler(object):
 
         group_server_name = get_domain_from_id(group_id)
 
+        try:
             res = yield self.transport_client.get_users_in_group(
                 get_domain_from_id(group_id), group_id, requester_user_id
             )
+        except RequestSendFailed:
+            raise SynapseError(502, "Failed to contact group server")
 
         chunk = res["chunk"]
         valid_entries = []
@@ -258,9 +267,12 @@ class GroupsLocalHandler(object):
             local_attestation = self.attestations.create_attestation(group_id, user_id)
             content["attestation"] = local_attestation
 
+            try:
                 res = yield self.transport_client.join_group(
                     get_domain_from_id(group_id), group_id, user_id, content
                 )
+            except RequestSendFailed:
+                raise SynapseError(502, "Failed to contact group server")
 
             remote_attestation = res["attestation"]
 
@@ -299,9 +311,12 @@ class GroupsLocalHandler(object):
             local_attestation = self.attestations.create_attestation(group_id, user_id)
             content["attestation"] = local_attestation
 
+            try:
                 res = yield self.transport_client.accept_group_invite(
                     get_domain_from_id(group_id), group_id, user_id, content
                 )
+            except RequestSendFailed:
+                raise SynapseError(502, "Failed to contact group server")
 
             remote_attestation = res["attestation"]
 
@@ -338,6 +353,7 @@ class GroupsLocalHandler(object):
                 group_id, user_id, requester_user_id, content
             )
         else:
+            try:
                 res = yield self.transport_client.invite_to_group(
                     get_domain_from_id(group_id),
                     group_id,
@@ -345,6 +361,8 @@ class GroupsLocalHandler(object):
                     requester_user_id,
                     content,
                 )
+            except RequestSendFailed:
+                raise SynapseError(502, "Failed to contact group server")
 
         return res
 
@@ -398,6 +416,7 @@ class GroupsLocalHandler(object):
             )
         else:
             content["requester_user_id"] = requester_user_id
+            try:
                 res = yield self.transport_client.remove_user_from_group(
                     get_domain_from_id(group_id),
                     group_id,
@@ -405,6 +424,8 @@ class GroupsLocalHandler(object):
                     user_id,
                     content,
                 )
+            except RequestSendFailed:
+                raise SynapseError(502, "Failed to contact group server")
 
         return res
 
@@ -435,9 +456,13 @@ class GroupsLocalHandler(object):
 
             return {"groups": result}
         else:
+            try:
                 bulk_result = yield self.transport_client.bulk_get_publicised_groups(
                     get_domain_from_id(user_id), [user_id]
                 )
+            except RequestSendFailed:
+                raise SynapseError(502, "Failed to contact group server")
+
             result = bulk_result.get("users", {}).get(user_id)
             # TODO: Verify attestations
             return {"groups": result}