Add support for stream writer Synapse workers

As stream writer workers are also powered by the `generic_worker`
Synapse app, this necessitated that we provide means for distinguishing
between them and regular `generic_workers`.

I've also taken the time to optimize nginx configuration generation
(more Jinja2 macro usage, less duplication).

Worker names have also changed.
Workers are now named sequentially like this:
- `matrix-synapse-worker-0-generic`
- `matrix-synapse-worker-1-stream-writer-typing`
- `matrix-synapse-worker-2-pusher`

instead of `matrix-synapse-worker_generic_worker-18111` (indexed with a
port number).

People who modify `matrix_synapse_workers_enabled_list` directly will
need to adjust their configuration.

roles/matrix-synapse/tasks/synapse/workers/init.yml

@@ -7,18 +7,47 @@
 - name: Build generic workers
   ansible.builtin.set_fact:
     worker:
+      id: "generic-worker-{{ item }}"
+      name: "matrix-synapse-worker-generic-{{ item }}"
       type: 'generic_worker'
-      instanceId: "{{ matrix_synapse_workers_generic_workers_port_range_start + item }}"
+      app: 'generic_worker'
+      webserving: true
       port: "{{ matrix_synapse_workers_generic_workers_port_range_start + item }}"
       metrics_port: "{{ matrix_synapse_workers_generic_workers_metrics_range_start + item }}"
   register: "matrix_synapse_workers_list_results_generic_workers"
   loop: "{{ range(0, matrix_synapse_workers_generic_workers_count | int) | list }}"
 
+- name: Build stream writer workers
+  ansible.builtin.set_fact:
+    worker:
+      id: "stream-writer-{{ item }}-{{ item.stream }}"
+      # Names must not include understores. Certain stream writer streams (to_device, account_data, ..) do, so we fix them up.
+      name: "matrix-synapse-worker-stream-writer-{{ idx }}-{{ item.stream | replace('_', '-') }}"
+      type: 'stream_writer'
+      app: "generic_worker"
+      webserving: "{{ item.stream in matrix_synapse_workers_webserving_stream_writer_types }}"
+      stream_writer_stream: "{{ item.stream }}"
+      port: "{{ matrix_synapse_workers_stream_writer_workers_http_port_range_start + idx }}"
+      replication_port: "{{ matrix_synapse_workers_stream_writer_workers_replication_port_range_start + idx }}"
+      metrics_port: "{{ matrix_synapse_workers_stream_writer_workers_metrics_range_start + idx }}"
+  register: "matrix_synapse_workers_list_results_stream_writer_workers"
+  loop: "{{ matrix_synapse_workers_stream_writers }}"
+  loop_control:
+    index_var: idx
+
+- name: Populate matrix_synapse_stream_writers from enabled stream writer workers list
+  ansible.builtin.set_fact:
+    matrix_synapse_stream_writers: "{{ matrix_synapse_stream_writers | combine ({item.ansible_facts.worker.stream_writer_stream: [item.ansible_facts.worker.name]}) }}"
+  with_items: "{{ matrix_synapse_workers_list_results_stream_writer_workers.results }}"
+
 - name: Build federation sender workers
   ansible.builtin.set_fact:
     worker:
+      id: "federation-sender-{{ item }}"
+      name: "matrix-synapse-worker-federation-sender-{{ item }}"
       type: 'federation_sender'
-      instanceId: "{{ item }}"
+      app: 'federation_sender'
+      webserving: false
       port: 0
       metrics_port: "{{ matrix_synapse_workers_federation_sender_workers_metrics_range_start + item }}"
   register: "matrix_synapse_workers_list_results_federation_sender_workers"
@@ -28,8 +57,11 @@
 - name: Build pusher workers
   ansible.builtin.set_fact:
     worker:
+      id: "pusher-{{ item }}"
+      name: "matrix-synapse-worker-pusher-{{ item }}"
       type: 'pusher'
-      instanceId: "{{ item }}"
+      app: 'pusher'
+      webserving: false
       port: 0
       metrics_port: "{{ matrix_synapse_workers_pusher_workers_metrics_range_start + item }}"
   register: "matrix_synapse_workers_list_results_pusher_workers"
@@ -39,8 +71,11 @@
 - name: Build appservice workers
   ansible.builtin.set_fact:
     worker:
+      id: "appservice-{{ item }}"
+      name: "matrix-synapse-worker-appservice-{{ item }}"
       type: 'appservice'
-      instanceId: "{{ item }}"
+      app: 'appservice'
+      webserving: false
       port: 0
       metrics_port: "{{ matrix_synapse_workers_appservice_workers_metrics_range_start + item }}"
   register: "matrix_synapse_workers_list_results_appservice_workers"
@@ -49,8 +84,11 @@
 - name: Build media_repository workers
   ansible.builtin.set_fact:
     worker:
+      id: "media-repository-{{ item }}"
+      name: "matrix-synapse-worker-media-repository-{{ item }}"
       type: 'media_repository'
-      instanceId: "{{ matrix_synapse_workers_media_repository_workers_port_range_start + item }}"
+      app: 'media_repository'
+      webserving: true
       port: "{{ matrix_synapse_workers_media_repository_workers_port_range_start + item }}"
       metrics_port: "{{ matrix_synapse_workers_media_repository_workers_metrics_range_start + item }}"
   register: "matrix_synapse_workers_list_results_media_repository_workers"
@@ -62,6 +100,8 @@
     {{
       matrix_synapse_workers_list_results_generic_workers.results
       +
+      matrix_synapse_workers_list_results_stream_writer_workers.results
+      +
       matrix_synapse_workers_list_results_federation_sender_workers.results
       +
       matrix_synapse_workers_list_results_pusher_workers.results