Added mediaworker.

matrix/draupnir/README.md

@@ -54,7 +54,7 @@ Copy it to `production.yaml` and change what you must.
 | Option | Value | Meaning |
 | :---- | :---- | :---- |
 | `homeserverUrl` | `http://localhost:8008` | Where to communicate with Synapse when using network port|
-| `homeserverUrl` | `http://unix://run/matrix-synapse/incoming_main.sock` | Where to communicate with Synapse when using UNIX sockets (see [Workers](../synapse/workers.md)) |
+| `homeserverUrl` | `http://unix:/run/matrix-synapse/incoming_main.sock` | Where to communicate with Synapse when using UNIX sockets (see [Workers](../synapse/workers.md)) |
 | `rawHomeserverUrl` | `https://matrix.example.com` | Same as `server_name` |
 | `accessToken` | access token | Copy from login session or create in [Synapse Admin](../synapse-admin)) |
 | `password` | password | Password for the account |

matrix/synapse/workers.md

@@ -252,6 +252,9 @@ chown matrix-synapse:matrix-synapse /etc/matrix-synapse/workers
 chmod 750 /etc/matrix-synapse-workers
 ```
 
+
+### Generic worker
+
 Workers look very much the same, very little configuration is needed. This is
 what you need:
 
@@ -306,6 +309,44 @@ the network. This creates extra overhead, so you want to use sockets whenever
 possible.
 
 
+### Media worker
+
+The media worker is slightly different than the generic one. It doesn't use the
+`synapse.app.generic_worker`, but a specialised one: `synapse.app.media_repository`.
+To prevent the main process from handling media itself, you have to explicitly
+tell it to leave that to the worker, by adding this to the configuration (in
+our setup `conf.d/listeners.yaml`):
+
+```
+enable_media_repo: false
+media_instance_running_background_jobs: mediaworker
+```
+
+The worker `mediaworker` looks like this:
+
+```
+worker_app: "synapse.app.media_repository"
+worker_name: "mediaworker"
+worker_log_config: "/etc/matrix-synapse/logconf.d/media.yaml"
+
+worker_listeners:
+  - path: "/run/matrix-synapse/inbound_mediaworker.sock"
+    type: http
+    resources:
+      - names:
+        - media
+        - federation
+
+  - path: "/run/matrix-synapse/replication_mediaworker.sock"
+    type: http
+    resources:
+      - names: [replication]
+```
+
+If you use more than one mediaworker, know that they must all run on the same
+machine; scaling it over more than one machine will not work.
+
+
 ## Worker logging
 
 As stated before, you configure the logging of workers in a separate yaml