mirror of
https://github.com/lightpanda-io/browser.git
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85 lines
2.8 KiB
Zig
85 lines
2.8 KiB
Zig
// Copyright (C) 2023-2026 Lightpanda (Selecy SAS)
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//
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// Francis Bouvier <francis@lightpanda.io>
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// Pierre Tachoire <pierre@lightpanda.io>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//! Stdio JSON-RPC writer for the browser-tools MCP server
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//! (`mcp/Server.zig`).
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const std = @import("std");
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const lp = @import("lightpanda");
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const protocol = @import("protocol.zig");
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const Self = @This();
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/// A screenshot response is hundreds of KB; don't keep that parked.
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pub const large_response = 256 * 1024;
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writer: *std.Io.Writer,
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mutex: std.Io.Mutex = .init,
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aw: std.Io.Writer.Allocating,
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pub fn init(allocator: std.mem.Allocator, writer: *std.Io.Writer) Self {
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return .{ .writer = writer, .aw = .init(allocator) };
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}
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pub fn deinit(self: *Self) void {
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self.aw.deinit();
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}
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/// Point subsequent responses at a different sink. The HTTP transport uses
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/// this to capture each request's response into its own buffer; safe because
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/// the browser worker retargets and writes on a single thread.
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pub fn retarget(self: *Self, writer: *std.Io.Writer) void {
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self.writer = writer;
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}
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fn sendResponse(self: *Self, response: anytype) !void {
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self.mutex.lockUncancelable(lp.io);
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defer self.mutex.unlock(lp.io);
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self.aw.clearRetainingCapacity();
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try std.json.Stringify.value(response, .{ .emit_null_optional_fields = false }, &self.aw.writer);
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try self.aw.writer.writeByte('\n');
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try self.writer.writeAll(self.aw.writer.buffered());
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try self.writer.flush();
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if (self.aw.writer.buffer.len > large_response) {
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const allocator = self.aw.allocator;
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self.aw.deinit();
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self.aw = .init(allocator);
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}
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}
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pub fn sendResult(self: *Self, id: std.json.Value, result: anytype) !void {
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const GenericResponse = struct {
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jsonrpc: []const u8 = "2.0",
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id: std.json.Value,
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result: @TypeOf(result),
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};
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try self.sendResponse(GenericResponse{ .id = id, .result = result });
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}
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pub fn sendError(self: *Self, id: std.json.Value, code: protocol.ErrorCode, message: []const u8) !void {
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try self.sendResponse(protocol.Response{
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.id = id,
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.@"error" = protocol.Error{
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.code = @intFromEnum(code),
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.message = message,
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},
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});
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}
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