STRLCPY/graphql-engine

Add `/metadata` endpoint which serves the initial, raw metadata (#459)

## Description

As a temporary means of supporting a local development setup, this PR
adds a `/metadata` endpoint that serves the raw metadata that the engine
was started with.

![image](https://github.com/hasura/v3-engine/assets/358550/bf34c3f8-d153-4a93-9044-dbaa15299481)

V3_GIT_ORIGIN_REV_ID: 44c552cfe29ee587fa0d383f7788aacc5579770f

Philip Lykke Carlsen committed with hasura-bot 1 month ago

624df9a5

1 parent 93d608c1

Revision indexing in progress... (symbol navigation in revisions will be accurate after indexed)

Total 1 files

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v3/crates/engine/bin/engine/main.rs

		skipped 127 lines
128	128		async fn start_engine(server: &ServerOptions) -> Result<(), StartupError> {
129	129		let auth_config =
130	130		read_auth_config(&server.authn_config_path).map_err(StartupError::ReadAuth)?;
131		-	let schema = read_schema(&server.metadata_path).map_err(StartupError::ReadSchema)?;
	131	+	let (raw_metadata, schema) =
	132	+	read_schema(&server.metadata_path).map_err(StartupError::ReadSchema)?;
132	133		let http_context = HttpContext {
133	134		client: reqwest::Client::new(),
134	135		ndc_response_size_limit: None,
		skipped 3 lines
138	139		schema,
139	140		auth_config,
140	141		});
	142	+
	143	+	let metadata_route = Router::new().route("/metadata", get(\|\| async { raw_metadata }));
141	144
142	145		let graphql_route = Router::new()
143	146		.route("/graphql", post(handle_request))
		skipped 36 lines
180	183		let app = Router::new()
181	184		// serve graphiql at root
182	185		.route("/", get(graphiql))
	186	+	.merge(metadata_route)
183	187		.merge(graphql_route)
184	188		.merge(explain_route)
185	189		.merge(health_route)
		skipped 215 lines
401	405		response
402	406		}
403	407
404		-	fn read_schema(metadata_path: &PathBuf) -> Result<gql::schema::Schema<GDS>, anyhow::Error> {
	408	+	fn read_schema(
	409	+	metadata_path: &PathBuf,
	410	+	) -> Result<(String, gql::schema::Schema<GDS>), anyhow::Error> {
405	411		let raw_metadata = std::fs::read_to_string(metadata_path)?;
406	412		let metadata = open_dds::Metadata::from_json_str(&raw_metadata)?;
407		-	Ok(engine::build::build_schema(metadata)?)
	413	+	Ok((raw_metadata, engine::build::build_schema(metadata)?))
408	414		}
409	415
410	416		fn read_auth_config(path: &PathBuf) -> Result<AuthConfig, anyhow::Error> {
		skipped 6 lines