[WIP] Add command to generate OpenAPI 3.0 Specs from exisiting json-rpc endpoint documentation

Cargo.toml

@@ -33,6 +33,8 @@ futures = "0.3.19"
 serde_json = "1"
 log = "0.4"
 term = "0.6"
+serde_yaml = "0.9"
+syn = { version = "2.0", features = ["full", "parsing"] }
 
 grin_api = { path = "./api", version = "5.4.0-alpha.0" }
 grin_config = { path = "./config", version = "5.4.0-alpha.0" }

api/src/macros.rs

@@ -0,0 +1,98 @@
+// Copyright 2021 The Grin Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// Attribute macro for documenting API endpoints
+///
+/// Example usage:
+/// ```rust
+/// #[api_endpoint]
+/// #[endpoint(
+///     path = "/v1/status",
+///     method = "GET",
+///     summary = "Get node status",
+///     description = "Returns the current status of the node"
+/// )]
+/// pub struct StatusHandler {
+///     pub chain: Weak<Chain>,
+/// }
+/// ```
+#[macro_export]
+macro_rules! api_endpoint {
+    (
+        $(#[endpoint(
+            path = $path:expr,
+            method = $method:expr,
+            summary = $summary:expr,
+            description = $description:expr
+            $(, params = [$($param:expr),*])?
+            $(, response = $response:ty)?
+        )])*
+        pub struct $name:ident {
+            $($field:ident: $type:ty),* $(,)?
+        }
+    ) => {
+        pub struct $name {
+            $($field: $type),*
+        }
+
+        impl ApiEndpoint for $name {
+            fn get_endpoint_spec() -> EndpointSpec {
+                EndpointSpec {
+                    path: $path.to_string(),
+                    method: $method.to_string(),
+                    summary: $summary.to_string(),
+                    description: $description.to_string(),
+                    params: vec![$($($param.into()),*)?],
+                    response: None $(Some(stringify!($response).to_string()))?
+                }
+            }
+        }
+    };
+}
+
+/// Trait for types that represent API endpoints
+pub trait ApiEndpoint {
+	fn get_endpoint_spec() -> EndpointSpec;
+}
+
+/// Represents an OpenAPI endpoint specification
+pub struct EndpointSpec {
+	pub path: String,
+	pub method: String,
+	pub summary: String,
+	pub description: String,
+	pub params: Vec<ParamSpec>,
+	pub response: Option<String>,
+}
+
+/// Represents an OpenAPI parameter specification
+pub struct ParamSpec {
+	pub name: String,
+	pub description: String,
+	pub required: bool,
+	pub schema_type: String,
+	pub location: String,
+}
+
+impl From<(&str, &str, bool, &str, &str)> for ParamSpec {
+	fn from(tuple: (&str, &str, bool, &str, &str)) -> Self {
+		ParamSpec {
+			name: tuple.0.to_string(),
+			description: tuple.1.to_string(),
+			required: tuple.2,
+			schema_type: tuple.3.to_string(),
+			location: tuple.4.to_string(),
+		}
+	}
+}

src/bin/grin.rs

@@ -22,6 +22,7 @@ extern crate log;
 use crate::config::config::SERVER_CONFIG_FILE_NAME;
 use crate::core::global;
 use crate::tools::check_seeds;
+use crate::tools::openapi;
 use crate::util::init_logger;
 use clap::App;
 use futures::channel::oneshot;
@@ -222,6 +223,25 @@ fn real_main() -> i32 {
 			0
 		}
 
+		// openapi command
+		("openapi", Some(args)) => {
+			let output = args.value_of("output").unwrap();
+			let format = args.value_of("format").unwrap();
+			match openapi::generate_openapi_spec(output, format) {
+				Ok(_) => {
+					println!(
+						"Successfully generated OpenAPI documentation at: {}",
+						output
+					);
+					0
+				}
+				Err(e) => {
+					error!("Failed to generate OpenAPI documentation: {}", e);
+					1
+				}
+			}
+		}
+
 		// If nothing is specified, try to just use the config file instead
 		// this could possibly become the way to configure most things
 		// with most command line options being phased out

src/bin/grin.yml

@@ -103,3 +103,18 @@ subcommands:
               help: Output file to write the results to
               long: output
               takes_value: true
+  - openapi:
+      about: Generate OpenAPI documentation from JSON-RPC endpoints
+      args:
+        - output:
+            help: Output file path
+            short: o
+            long: output
+            takes_value: true
+            required: true
+        - format:
+            help: Output format (json or yaml)
+            short: f
+            long: format
+            takes_value: true
+            default_value: json

src/bin/tools/mod.rs

@@ -16,3 +16,5 @@
 mod seedcheck;
 
 pub use seedcheck::check_seeds;
+
+pub mod openapi;