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mcp: reuse arena allocator for message processing

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Adrià Arrufat
2026-02-28 22:38:16 +09:00
parent 8b0118e2c8
commit 96942960a9
1 changed files with 6 additions and 3 deletions
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9
src/mcp/router.zig
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@@ -15,6 +15,9 @@ pub fn processRequests(server: *Server) !void {
server.is_running.store(true, .seq_cst); server.is_running.store(true, .seq_cst);
var arena: std.heap.ArenaAllocator = .init(server.allocator);
defer arena.deinit();
while (server.is_running.load(.seq_cst)) { while (server.is_running.load(.seq_cst)) {
const msg = stdin.interface.adaptToOldInterface().readUntilDelimiterAlloc(server.allocator, '\n', 1024 * 1024 * 10) catch |err| { const msg = stdin.interface.adaptToOldInterface().readUntilDelimiterAlloc(server.allocator, '\n', 1024 * 1024 * 10) catch |err| {
if (err == error.EndOfStream) break; if (err == error.EndOfStream) break;
@@ -24,13 +27,13 @@ pub fn processRequests(server: *Server) !void {
if (msg.len == 0) continue; if (msg.len == 0) continue;
var arena: std.heap.ArenaAllocator = .init(server.allocator);
defer arena.deinit();
handleMessage(server, arena.allocator(), msg) catch |err| { handleMessage(server, arena.allocator(), msg) catch |err| {
log.warn(.mcp, "Error processing message", .{ .err = err }); log.warn(.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. // We should ideally send a parse error response back, but it's hard to extract the ID if parsing failed entirely.
}; };
// 32KB: avoid reallocations while keeping memory footprint low.
_ = arena.reset(.{ .retain_with_limit = 32 * 1024 });
} }
} }