curl: fix --test-event --parallel

(in debug-builds)

Fix implementation in curl using libuv to process parallel transfers.
Add pytest capabilities to run test cases with --test-event.

- fix uv_timer handling to carry correct 'data' pointing to uv context.
- fix uv_loop handling to reap and add transfers when possible
- fix return code when a transfer errored

Closes #14413

tests/http/test_02_download.py

@@ -87,18 +87,19 @@ class TestDownload:
         r.check_response(http_status=200, count=100, connect_count=1)
 
     # download 100 files parallel
-    @pytest.mark.parametrize("proto", ['h2', 'h3'])
-    def test_02_04_download_100_parallel(self, env: Env,
+    @pytest.mark.parametrize("proto", ['http/1.1', 'h2', 'h3'])
+    def test_02_04_download_20_parallel(self, env: Env,
                                          httpd, nghttpx, repeat, proto):
         if proto == 'h3' and not env.have_h3():
             pytest.skip("h3 not supported")
-        max_parallel = 50
+        count = 20
+        max_parallel = 10
         curl = CurlClient(env=env)
-        urln = f'https://{env.authority_for(env.domain1, proto)}/data.json?[0-99]'
+        urln = f'https://{env.authority_for(env.domain1, proto)}/data.json?[0-{count-1}]'
         r = curl.http_download(urls=[urln], alpn_proto=proto, extra_args=[
             '--parallel', '--parallel-max', f'{max_parallel}'
         ])
-        r.check_response(http_status=200, count=100)
+        r.check_response(http_status=200, count=count)
         if proto == 'http/1.1':
             # http/1.1 parallel transfers will open multiple connections
             assert r.total_connects > 1, r.dump_logs()

tests/http/testenv/client.py

@@ -50,7 +50,7 @@ class LocalClient:
         self.name = name
         self.path = os.path.join(env.project_dir, f'tests/http/clients/{name}')
         self.env = env
-        self._run_env= run_env
+        self._run_env = run_env
         self._timeout = timeout if timeout else env.test_timeout
         self._curl = os.environ['CURL'] if 'CURL' in os.environ else env.curl
         self._run_dir = run_dir if run_dir else os.path.join(env.gen_dir, name)
@@ -92,12 +92,18 @@ class LocalClient:
         exception = None
         myargs = [self.path]
         myargs.extend(args)
+        run_env = None
+        if self._run_env:
+            run_env = self._run_env.copy()
+            for key in ['CURL_DEBUG']:
+                if key in os.environ and key not in run_env:
+                    run_env[key] = os.environ[key]
         try:
             with open(self._stdoutfile, 'w') as cout:
                 with open(self._stderrfile, 'w') as cerr:
                     p = subprocess.run(myargs, stderr=cerr, stdout=cout,
                                        cwd=self._run_dir, shell=False,
-                                       input=None, env=self._run_env,
+                                       input=None, env=run_env,
                                        timeout=self._timeout)
                     exitcode = p.returncode
         except subprocess.TimeoutExpired:

tests/http/testenv/curl.py

@@ -824,6 +824,9 @@ class CurlClient:
             urls = [urls]
 
         args = [self._curl, "-s", "--path-as-is"]
+        if 'CURL_TEST_EVENT' in os.environ:
+            args.append('--test-event')
+
         if with_headers:
             args.extend(["-D", self._headerfile])
         if def_tracing is not False and not self._silent: