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mcp: simplify request processing to single-threaded

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Adrià Arrufat
2026-02-28 21:26:51 +09:00
parent aae9a505e0
commit 6897d72c3e
3 changed files with 23 additions and 84 deletions
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32
src/mcp/router.zig
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@@ -8,20 +8,30 @@ const resources = @import("resources.zig");
const Server = @import("Server.zig");
const tools = @import("tools.zig");
pub fn processRequests(server: *Server) void {
pub fn processRequests(server: *Server) !void {
var stdin_file = std.fs.File.stdin();
var stdin_buf: [8192]u8 = undefined;
var stdin = stdin_file.reader(&stdin_buf);
server.is_running.store(true, .seq_cst);
while (server.is_running.load(.seq_cst)) {
if (server.getNextMessage()) |msg| {
defer server.allocator.free(msg);
const msg = stdin.interface.adaptToOldInterface().readUntilDelimiterAlloc(server.allocator, '\n', 1024 * 1024 * 10) catch |err| {
if (err == error.EndOfStream) break;
return err;
};
defer server.allocator.free(msg);
// Critical: Per-request Arena
var arena = std.heap.ArenaAllocator.init(server.allocator);
defer arena.deinit();
if (msg.len == 0) continue;
handleMessage(server, arena.allocator(), msg) catch |err| {
log.err(.app, "MCP Error processing message", .{ .err = err });
// We should ideally send a parse error response back, but it's hard to extract the ID if parsing failed entirely.
};
}
// Critical: Per-request Arena
var arena = std.heap.ArenaAllocator.init(server.allocator);
defer arena.deinit();
handleMessage(server, arena.allocator(), msg) catch |err| {
log.err(.app, "MCP Error processing message", .{ .err = err });
// We should ideally send a parse error response back, but it's hard to extract the ID if parsing failed entirely.
};
}
}