[graphql/rpc] easy: allows loading cfg from path (#14244)

## Description 

Needed for easier deploys

## Test Plan 

Manual

---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

crates/sui-graphql-rpc/src/commands.rs

@@ -18,6 +18,11 @@ pub enum Command {
         #[clap(short, long)]
         file: Option<PathBuf>,
     },
+    FromConfig {
+        /// Path to TOML file containing configuration for server.
+        #[clap(short, long)]
+        path: PathBuf,
+    },
     StartServer {
         /// URL of the RPC server for data fetching
         #[clap(short, long)]

crates/sui-graphql-rpc/src/config.rs

@@ -180,8 +180,12 @@ impl ServerConfig {
         serde_yaml::from_str::<Self>(&contents).unwrap()
     }
 
+    pub fn to_yaml(&self) -> String {
+        serde_yaml::to_string(&self).unwrap()
+    }
+
     pub fn to_yaml_file(&self, path: PathBuf) {
-        let config = serde_yaml::to_string(&self).unwrap();
+        let config = self.to_yaml();
         std::fs::write(path, config).unwrap();
     }
 }

crates/sui-graphql-rpc/src/main.rs

@@ -8,6 +8,7 @@ use clap::Parser;
 use sui_graphql_rpc::commands::Command;
 use sui_graphql_rpc::config::{ConnectionConfig, ServiceConfig};
 use sui_graphql_rpc::schema_sdl_export;
+use sui_graphql_rpc::server::builder::Server;
 use sui_graphql_rpc::server::simple_server::start_example_server;
 
 #[tokio::main]
@@ -38,6 +39,11 @@ async fn main() {
             println!("Starting server...");
             start_example_server(conn, service_config).await;
         }
+        Command::FromConfig { path } => {
+            let server = Server::from_yaml_config(path.to_str().unwrap());
+            println!("Starting server...");
+            server.await.run().await;
+        }
     }
 }
 

crates/sui-graphql-rpc/src/server/builder.rs

@@ -31,7 +31,7 @@ use hyper::server::conn::AddrIncoming as HyperAddrIncoming;
 use hyper::Server as HyperServer;
 use std::{any::Any, net::SocketAddr, sync::Arc};
 
-pub(crate) struct Server {
+pub struct Server {
     pub server: HyperServer<HyperAddrIncoming, IntoMakeServiceWithConnectInfo<Router, SocketAddr>>,
 }
 

crates/sui-graphql-rpc/src/server/mod.rs

@@ -3,5 +3,5 @@
 
 pub mod simple_server;
 
-mod builder;
+pub mod builder;
 mod version;