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mcp: stream resource and tool content to JSON output

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Adrià Arrufat
2026-02-28 23:04:22 +09:00
parent 96942960a9
commit 947e672d18
3 changed files with 134 additions and 51 deletions
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77
src/mcp/resources.zig
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@@ -34,6 +34,41 @@ const ReadParams = struct {
uri: []const u8,
};
const ResourceStreamingResult = struct {
contents: []const struct {
uri: []const u8,
mimeType: []const u8,
text: StreamingText,
},
const StreamingText = struct {
server: *Server,
uri: []const u8,
format: enum { html, markdown },
pub fn jsonStringify(self: @This(), jw: *std.json.Stringify) !void {
try jw.beginObject();
try jw.objectField("uri");
try jw.write(self.uri);
try jw.objectField("mimeType");
try jw.write(if (self.format == .html) "text/html" else "text/markdown");
try jw.objectField("text");
try jw.beginWriteRaw();
try jw.writer.writeByte('"');
var escaped = protocol.JsonEscapingWriter.init(jw.writer);
switch (self.format) {
.html => try lp.dump.root(self.server.page.document, .{}, &escaped.writer, self.server.page),
.markdown => try lp.markdown.dump(self.server.page.document.asNode(), .{}, &escaped.writer, self.server.page),
}
try jw.writer.writeByte('"');
jw.endWriteRaw();
try jw.endObject();
}
};
};
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");
@@ -44,37 +79,23 @@ pub fn handleRead(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
};
if (std.mem.eql(u8, params.uri, "mcp://page/html")) {
var aw = std.Io.Writer.Allocating.init(arena);
lp.dump.root(server.page.document, .{}, &aw.writer, server.page) catch {
return sendError(server, req.id.?, -32603, "Internal error reading HTML");
const result = ResourceStreamingResult{
.contents = &.{.{
.uri = params.uri,
.mimeType = "text/html",
.text = .{ .server = server, .uri = params.uri, .format = .html },
}},
};
const contents = [_]struct {
uri: []const u8,
mimeType: []const u8,
text: []const u8,
}{.{
.uri = params.uri,
.mimeType = "text/html",
.text = aw.written(),
}};
try sendResult(server, req.id.?, .{ .contents = &contents });
try sendResult(server, req.id.?, result);
} else if (std.mem.eql(u8, params.uri, "mcp://page/markdown")) {
var aw = std.Io.Writer.Allocating.init(arena);
lp.markdown.dump(server.page.document.asNode(), .{}, &aw.writer, server.page) catch {
return sendError(server, req.id.?, -32603, "Internal error reading Markdown");
const result = ResourceStreamingResult{
.contents = &.{.{
.uri = params.uri,
.mimeType = "text/markdown",
.text = .{ .server = server, .uri = params.uri, .format = .markdown },
}},
};
const contents = [_]struct {
uri: []const u8,
mimeType: []const u8,
text: []const u8,
}{.{
.uri = params.uri,
.mimeType = "text/markdown",
.text = aw.written(),
}};
try sendResult(server, req.id.?, .{ .contents = &contents });
try sendResult(server, req.id.?, result);
} else {
return sendError(server, req.id.?, -32602, "Resource not found");
}