Downloads a file and writes it to disk

Cargo.toml

@@ -1,6 +1,16 @@
-[package]
+[workspace]
-name = "mc-launcher-rs"
+resolver = "3"
+members = ["crates/*"]
+
+[workspace.package]
 version = "0.1.0"
 edition = "2024"
 
-[dependencies]
+[workspace.dependencies]
+anyhow = "1.0.104"
+const_format = "0.2.36"
+reqwest = "0.13.5"
+serde = { version = "1.0.229", features = ["derive"] }
+serde_json = "1.0.154"
+tokio = { version = "1.54.0", features = ["full"] }
+thiserror = "2.0.21"

README.md

@@ -0,0 +1,43 @@
+# mc-launcher-rs
+
+A simple minecraft launcher, in Rust  
+
+## Goal
+The goal of this project is for me to learn a little bit of Rust, and experiment with the ecosystem.  
+The current scope of the project is just downloading minecraft and launching it.
+
+Maybe modloader after all is stable-ish
+
+## Stack
+// Todo, link
+| Usage    | Choice      |
+| -------- | ----------- |
+| UI       | egui        |
+| Async    | tokio       |
+| HTTP     | reqwest     |
+| JSON     | serde       |
+| Hashing  | sha1        |
+| Archives | zip         |
+| Folders  | directories |
+| Errors   | anyhow      |
+| Logs     | tracing     |
+
+## Roadmap
+Do the download logic, then the UI.
+
+Download:  
+[x] Read the manifest
+[x] Manifest -> JSON
+[] Interpret the data  
+[] Download from the JSON -> HTTP/Tokio  
+[] Go from sequential to parallel
+
+## Structure
+`core` -> all the launcher stuff, version manifest, JSON, download, hashes, launch args...
+`cli` -> a small wrapper that calls the core and display text
+`gui` -> another small wrapper that calls the core and displays it with `egui`
+
+
+## Links
+https://piston-meta.mojang.com/mc/game/version_manifest_v2.json  
+This one is the main manifest

crates/cli/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "launcher-cli"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+launcher-core = { version = "0.1.0", path = "../core" }
+tokio = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+anyhow = { workspace = true }
+reqwest = { workspace = true }
+const_format = { workspace = true }
+thiserror = { workspace = true }

crates/cli/src/main.rs

@@ -0,0 +1,12 @@
+use anyhow::Result;
+use launcher_core::manifest::{get_manifest, init_network, parse_manifest, write_manifest};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    println!("Runtime test, writing the manifest");
+    let client = init_network();
+    let data = get_manifest(client.clone()).await?;
+    write_manifest(&data).await?;
+    parse_manifest(&data).await?;
+    Ok(())
+}

crates/core/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "launcher-core"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+tokio = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+anyhow = { workspace = true }
+reqwest = { workspace = true }
+const_format = { workspace = true }
+thiserror = { workspace = true }
+
+[dev-dependencies]
+tokio = { workspace = true }

crates/core/src/errors.rs

@@ -0,0 +1,13 @@
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum CoreError {
+    #[error("Network error: {0}")]
+    Network(#[from] reqwest::Error),
+
+    #[error("Disk error: {0}")]
+    Io(#[from] std::io::Error),
+
+    #[error("JSON error: {0}")]
+    JSON(#[from] serde_json::Error),
+}

crates/core/src/lib.rs

@@ -0,0 +1,12 @@
+pub mod errors;
+pub mod manifest;
+
+use const_format::concatcp;
+// Constants
+// Paths
+pub const FILE_PATH: &str = ".minecraft"; //adjusted later
+pub const DOWNLOAD_PATH: &str = concatcp!(FILE_PATH, "/downloads");
+pub const MANIFEST_PATH: &str = concatcp!(DOWNLOAD_PATH, "/manifest.json");
+
+// Urls
+pub const MANIFEST_URL: &str = "https://piston-meta.mojang.com/mc/game/version_manifest_v2.json";

crates/core/src/manifest.rs

@@ -0,0 +1,39 @@
+use reqwest::Client;
+use serde_json::Value;
+use std::sync::Arc;
+use std::time::Duration;
+
+use crate::{DOWNLOAD_PATH, MANIFEST_PATH, MANIFEST_URL, errors::CoreError};
+
+pub fn init_network() -> Arc<Client> {
+    let client = Arc::new(
+        Client::builder()
+            .timeout(Duration::from_secs(60))
+            .build()
+            .expect("Failed to create HTTP client"),
+    );
+
+    return client;
+}
+
+pub async fn get_manifest(client: Arc<Client>) -> Result<String, CoreError> {
+    let body = client.get(MANIFEST_URL).send().await?.text().await?;
+
+    Ok(body)
+}
+
+pub async fn write_manifest(data: &str) -> Result<(), CoreError> {
+    // Checks if the folder is there, else, create it
+    tokio::fs::create_dir_all(DOWNLOAD_PATH).await?;
+    tokio::fs::write(MANIFEST_PATH, data).await?;
+    Ok(())
+}
+
+pub async fn parse_manifest(data: &str) -> Result<Value, CoreError> {
+    // Reads from a string
+    let v: Value = serde_json::from_str(data)?;
+
+    println!("Testing stuff.\nSo latest {}", v["latest"]["release"]);
+
+    Ok(v)
+}

crates/core/tests/tests.rs

@@ -0,0 +1,11 @@
+/*
+#[cfg(test)]
+
+mod tests {
+    use super::*;
+    #[test]
+    fn test_write() {
+        assert!()
+    }
+}
+*/

crates/gui/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "launcher-gui"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+launcher-core = { version = "0.1.0", path = "../core" }

flake.lock

@@ -0,0 +1,57 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1792506237,
+        "narHash": "sha256-hVMDyAXU0kxRuG3GygbZkzf5x+aBNEC0NYEJ6KwHtD4=",
+        "rev": "5adc50831c259f87faeb09ddf930d43597197473",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixpkgs/nixpkgs-26.11pre1097770.5adc50831c25/nixexprs.tar.zst"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1791914995,
+        "narHash": "sha256-Zf/xfQEAasnwnmEfHqW/4hjDE/s44yn2hD4RuVIZRjA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b7a79d3fea1e214f6d668d521cecec0c01e26544",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-utils",
+        "type": "indirect"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}