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mcp: unify error reporting and use named error codes

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This commit is contained in:
Adrià Arrufat
2026-03-01 21:29:59 +09:00
parent e6cc3e8c34
commit 8cbc58d257
5 changed files with 55 additions and 91 deletions
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34
src/mcp/resources.zig
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@@ -13,7 +13,7 @@ pub fn handleList(server: *Server, req: protocol.Request) !void {
.resources = server.resources,
};
try sendResult(server, req.id.?, result);
try server.sendResult(req.id.?, result);
}
const ReadParams = struct {
@@ -61,11 +61,11 @@ const ResourceStreamingResult = struct {
pub fn handleRead(server: *Server, arena: std.mem.Allocator, req: protocol.Request) !void {
if (req.params == null) {
return sendError(server, req.id.?, -32602, "Missing params");
return server.sendError(req.id.?, .InvalidParams, "Missing params");
}
const params = std.json.parseFromValueLeaky(ReadParams, arena, req.params.?, .{ .ignore_unknown_fields = true }) catch {
return sendError(server, req.id.?, -32602, "Invalid params");
return server.sendError(req.id.?, .InvalidParams, "Invalid params");
};
if (std.mem.eql(u8, params.uri, "mcp://page/html")) {
@@ -76,7 +76,7 @@ pub fn handleRead(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
.text = .{ .server = server, .uri = params.uri, .format = .html },
}},
};
try sendResult(server, req.id.?, result);
try server.sendResult(req.id.?, result);
} else if (std.mem.eql(u8, params.uri, "mcp://page/markdown")) {
const result: ResourceStreamingResult = .{
.contents = &.{.{
@@ -85,30 +85,8 @@ pub fn handleRead(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
.text = .{ .server = server, .uri = params.uri, .format = .markdown },
}},
};
try sendResult(server, req.id.?, result);
try server.sendResult(req.id.?, result);
} else {
return sendError(server, req.id.?, -32602, "Resource not found");
return server.sendError(req.id.?, .InvalidRequest, "Resource not found");
}
}
pub fn sendResult(server: *Server, id: std.json.Value, result: anytype) !void {
const GenericResponse = struct {
jsonrpc: []const u8 = "2.0",
id: std.json.Value,
result: @TypeOf(result),
};
try server.sendResponse(GenericResponse{
.id = id,
.result = result,
});
}
pub fn sendError(server: *Server, id: std.json.Value, code: i64, message: []const u8) !void {
try server.sendResponse(protocol.Response{
.id = id,
.@"error" = protocol.Error{
.code = code,
.message = message,
},
});
}