chore: minor fixes to examples manifest file and reduced python test flakyness (#55)

Author: amunra

examples.manifest.yaml

@@ -103,23 +103,23 @@
     host: localhost
     port: 9009
 
- - name: ilp-from-conf
-   lang: c
-   path: examples/line_sender_c_example_from_conf.c
-   header: |-
-     [C client library docs](https://github.com/questdb/c-questdb-client/blob/main/doc/C.md)
-   conf: tcp::addr=localhost:9009;
+- name: ilp-from-conf
+  lang: c
+  path: examples/line_sender_c_example_from_conf.c
+  header: |-
+    [C client library docs](https://github.com/questdb/c-questdb-client/blob/main/doc/C.md)
+  conf: tcp::addr=localhost:9009;
 
- - name: ilp-from-conf
-   lang: cpp
-   path: examples/line_sender_cpp_example_from_conf.cpp
-   header: |-
-     [C client library docs](https://github.com/questdb/c-questdb-client/blob/main/doc/CPP.md)
-   conf: tcp::addr=localhost:9009;
+- name: ilp-from-conf
+  lang: cpp
+  path: examples/line_sender_cpp_example_from_conf.cpp
+  header: |-
+    [C client library docs](https://github.com/questdb/c-questdb-client/blob/main/doc/CPP.md)
+  conf: tcp::addr=localhost:9009;
 
-  - name: ilp-from-conf
-    lang: rust
-    path: questdb-rs/examples/from_conf.rs
-    header: |-
-      [Rust client library docs](https://docs.rs/crate/questdb-rs/latest)
-    conf: tcp::addr=localhost:9009;
+- name: ilp-from-conf
+  lang: rust
+  path: questdb-rs/examples/from_conf.rs
+  header: |-
+    [Rust client library docs](https://docs.rs/crate/questdb-rs/latest)
+  conf: tcp::addr=localhost:9009;

system_test/fixture.py

@@ -459,6 +459,19 @@ def start(self):
         env = dict(os.environ)
         env['CARGO_TARGET_DIR'] = str(self._target_dir)
         self._log_file = open(self._log_path, 'wb')
+
+        # Compile before running `cargo run`.
+        # Note that errors and output are purpously suppressed.
+        # This is just to exclude the build time from the start-up time.
+        # If there are build errors, they'll be reported later in the `run`
+        # call below.
+        subprocess.call(
+            ['cargo', 'build'],
+            cwd=self._code_dir,
+            env=env,
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL)
+
         self._proc = subprocess.Popen(
             ['cargo', 'run', str(self.qdb_ilp_port)],
             cwd=self._code_dir,

system_test/test.py

@@ -752,6 +752,17 @@ def test_bad_env_var(self):
         with self.assertRaisesRegex(qls.SenderError, r'.*Environment variable QDB_CLIENT_CONF not set.*'):
             qls._error_wrapped_call(qls._DLL.line_sender_from_env)
 
+    def test_manifest_yaml(self):
+        # Check the manifest file can be read as yaml.
+        try:
+            import yaml
+        except ImportError:
+            self.skipTest('Python version does not support yaml')
+        proj = Project()
+        manifest_path = proj.root_dir / 'examples.manifest.yaml'
+        with open(manifest_path, 'r') as f:
+            yaml.safe_load(f)
+
 
 def parse_args():
     parser = argparse.ArgumentParser('Run system tests.')