Fix IPC on Forge 1.17.1 - 1.20.1 (#4187)

* Reapply "Implement a more robust IPC system between the launcher and client (#4159)"

This reverts commit e25d726da4.

* Put game JAR and theseus JAR ahead of other JARs in classpath

* Fix 1.17-1.20 Forge by forcefully removing Multi-Release manifest entry

* Fix formatting

---------

Co-authored-by: Prospector <6166773+Prospector@users.noreply.github.com>

packages/app-lib/src/launcher/mod.rs

@@ -12,6 +12,7 @@ use crate::state::{
     Credentials, JavaVersion, ProcessMetadata, ProfileInstallStage,
 };
 use crate::util::io;
+use crate::util::rpc::RpcServerBuilder;
 use crate::{State, get_resource_file, process, state as st};
 use chrono::Utc;
 use daedalus as d;
@@ -22,7 +23,6 @@ use serde::Deserialize;
 use st::Profile;
 use std::fmt::Write;
 use std::path::PathBuf;
-use tokio::io::AsyncWriteExt;
 use tokio::process::Command;
 
 mod args;
@@ -608,6 +608,8 @@ pub async fn launch_minecraft(
     let (main_class_keep_alive, main_class_path) =
         get_resource_file!(env "JAVA_JARS_DIR" / "theseus.jar")?;
 
+    let rpc_server = RpcServerBuilder::new().launch().await?;
+
     command.args(
         args::get_jvm_arguments(
             args.get(&d::minecraft::ArgumentType::Jvm)
@@ -633,6 +635,7 @@ pub async fn launch_minecraft(
                 .logging
                 .as_ref()
                 .and_then(|x| x.get(&LoggingSide::Client)),
+            rpc_server.address(),
         )?
         .into_iter(),
     );
@@ -767,7 +770,8 @@ pub async fn launch_minecraft(
             state.directories.profile_logs_dir(&profile.path),
             version_info.logging.is_some(),
             main_class_keep_alive,
-            async |process: &ProcessMetadata, stdin| {
+            rpc_server,
+            async |process: &ProcessMetadata, rpc_server| {
                 let process_start_time = process.start_time.to_rfc3339();
                 let profile_created_time = profile.created.to_rfc3339();
                 let profile_modified_time = profile.modified.to_rfc3339();
@@ -790,14 +794,11 @@ pub async fn launch_minecraft(
                     let Some(value) = value else {
                         continue;
                     };
-                    stdin.write_all(b"property\t").await?;
-                    stdin.write_all(key.as_bytes()).await?;
-                    stdin.write_u8(b'\t').await?;
-                    stdin.write_all(value.as_bytes()).await?;
-                    stdin.write_u8(b'\n').await?;
+                    rpc_server
+                        .call_method_2::<()>("set_system_property", key, value)
+                        .await?;
                 }
-                stdin.write_all(b"launch\n").await?;
-                stdin.flush().await?;
+                rpc_server.call_method::<()>("launch").await?;
                 Ok(())
             },
         )