src/get_builds: service to fetch kernel build nodes

Add a service to poll for `build` events i.e. listen
to successful kernel build nodes and fetch artifacts.

Signed-off-by: Jeny Sadadia <[email protected]>

docker-compose.yaml

@@ -209,3 +209,17 @@ services:
       - './data/src:/home/kernelci/data/src'
       - './data/output:/home/kernelci/data/output'
 
+  get-builds:
+    container_name: 'kernelci-pipeline-get-builds'
+    image: 'kernelci/staging-kernelci'
+    env_file: ['.env']
+    stop_signal: 'SIGINT'
+    command:
+      - './pipeline/get_builds.py'
+      - '--settings=${KCI_SETTINGS:-/home/kernelci/config/kernelci.toml}'
+      - 'run'
+    volumes:
+      - './src:/home/kernelci/pipeline'
+      - './config:/home/kernelci/config'
+    extra_hosts:
+      - "host.docker.internal:host-gateway"

src/get_builds.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Copyright (C) 2024 Collabora Limited
+# Author: Jeny Sadadia <[email protected]>
+
+import sys
+
+import kernelci
+import kernelci.config
+from kernelci.legacy.cli import Args, Command, parse_opts
+
+from base import Service
+
+
+class GetBuilds(Service):
+
+    def __init__(self, configs, args):
+        super().__init__(configs, args, 'get_builds')
+
+    def _setup(self, args):
+        return self._api_helper.subscribe_filters({
+            'kind': 'kbuild',
+            'state': 'done',
+            'result': 'pass'
+        }, 'build')
+
+    def _stop(self, sub_id):
+        if sub_id:
+            self._api_helper.unsubscribe_filters(sub_id)
+        sys.stdout.flush()
+
+    def _run(self, sub_id):
+        self.log.info("Listening for events... ")
+        self.log.info("Press Ctrl-C to stop.")
+
+        while True:
+            node, _ = self._api_helper.receive_event_node(sub_id)
+            self.log.info(f"Build node received: {node}")
+            self.log.info(f"artifacts: {node.get('artifacts')}")
+        return True
+
+
+class cmd_run(Command):
+    help = "Listen for successful kernel build events"
+    args = [Args.api_config]
+
+    def __call__(self, configs, args):
+        return GetBuilds(configs, args).run(args)
+
+
+if __name__ == '__main__':
+    opts = parse_opts('get_builds', globals())
+    yaml_configs = opts.get_yaml_configs() or 'config'
+    configs = kernelci.config.load(yaml_configs)
+    status = opts.command(configs, opts)
+    sys.exit(0 if status is True else 1)