From 75ccfda14ed8f62f205b7281d0c0b81b8aac4c0b Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Sun, 22 Feb 2026 22:48:16 +0100 Subject: [PATCH 01/13] fix(benchmarks): resolve missing dependencies and package inclusion The Python benchmark suite strictly relies on psutil for monitoring system memory footprints and CPU load during tests. Additionally, the internal common modules failed to package gracefully. This fixes the pyproject definitions to allow seamless uv execution across all environments. Signed-off-by: Gyokhan Kochmarla --- benchmarks/pyproject.toml | 5 ++++- benchmarks/uv.lock | 36 +++++++++++++++++++++++++++++++++++- 2 files changed, 39 insertions(+), 2 deletions(-) diff --git a/benchmarks/pyproject.toml b/benchmarks/pyproject.toml index c394c79..be68e90 100644 --- a/benchmarks/pyproject.toml +++ b/benchmarks/pyproject.toml @@ -3,7 +3,9 @@ name = "protomq-bench-suite" version = "0.1.0" description = "ProtoMQ benchmark suite scripts" requires-python = ">=3.11" -dependencies = [] +dependencies = [ + "psutil>=7.2.2", +] [project.scripts] protomq-bench-b1 = "b1_baseline_concurrency.benchmark:main" @@ -23,6 +25,7 @@ packages = [ "b5_protobuf_load", "b6_connection_churn", "b7_message_sizes", + "common/protomq_benchmarks", ] [build-system] diff --git a/benchmarks/uv.lock b/benchmarks/uv.lock index f4f56e0..8718381 100644 --- a/benchmarks/uv.lock +++ b/benchmarks/uv.lock @@ -3,6 +3,40 @@ revision = 3 requires-python = ">=3.11" [[package]] -name = "protomq-benchmarks" +name = 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"https://files.pythonhosted.org/packages/8c/c7/7bb2e321574b10df20cbde462a94e2b71d05f9bbda251ef27d104668306a/psutil-7.2.2-cp37-abi3-win_arm64.whl", hash = "sha256:8c233660f575a5a89e6d4cb65d9f938126312bca76d8fe087b947b3a1aaac9ee", size = 134617, upload-time = "2026-01-28T18:15:36.514Z" }, +] From fa6928519f64768c7f5cbc16717fc35cba8b8554 Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Sun, 22 Feb 2026 22:48:30 +0100 Subject: [PATCH 02/13] feat(server): introduce optional HTTP Admin Server This adds conditional compilation for a non-blocking Admin Server that safely shares the MQTT event loop. It introduces 'POST /api/v1/schemas' to dynamically register protobuf schemas without restarting the broker, and various telemetry 'GET' endpoints for runtime observability. It tracks total message counts directly inside TopicBroker. It has zero overhead footprint when disabled via build flags. Signed-off-by: Gyokhan Kochmarla --- build.zig | 12 ++ src/broker/broker.zig | 2 + src/broker/mqtt_handler.zig | 1 + src/server/admin.zig | 261 ++++++++++++++++++++++++++++++++++++ src/server/tcp.zig | 82 ++++++++--- 5 files changed, 343 insertions(+), 15 deletions(-) create mode 100644 src/server/admin.zig diff --git a/build.zig b/build.zig index 6841686..9d0c96e 100644 --- a/build.zig +++ b/build.zig @@ -4,6 +4,12 @@ pub fn build(b: *std.Build) void { const target = b.standardTargetOptions(.{}); const optimize = b.standardOptimizeOption(.{}); + const admin_server = b.option(bool, "admin_server", "Enable the HTTP Admin Server") orelse false; + + const options = b.addOptions(); + options.addOption(bool, "admin_server", admin_server); + const options_module = options.createModule(); + // Server executable const server_exe = b.addExecutable(.{ .name = "protomq-server", @@ -11,6 +17,9 @@ pub fn build(b: *std.Build) void { .root_source_file = b.path("src/main.zig"), .target = target, .optimize = optimize, + .imports = &.{ + .{ .name = "build_options", .module = options_module }, + }, }), }); b.installArtifact(server_exe); @@ -50,6 +59,9 @@ pub fn build(b: *std.Build) void { .root_source_file = b.path("src/main.zig"), .target = target, .optimize = optimize, + .imports = &.{ + .{ .name = "build_options", .module = options_module }, + }, }), }); const run_unit_tests = b.addRunArtifact(unit_tests); diff --git a/src/broker/broker.zig b/src/broker/broker.zig index e59213d..a2efb41 100644 --- a/src/broker/broker.zig +++ b/src/broker/broker.zig @@ -4,6 +4,7 @@ const std = @import("std"); pub const TopicBroker = struct { allocator: std.mem.Allocator, subscriptions: std.StringHashMap(SubscriberList), + total_messages_routed: u64, const SubscriberList = std.ArrayList(usize); // List of client IDs @@ -11,6 +12,7 @@ pub const TopicBroker = struct { return TopicBroker{ .allocator = allocator, .subscriptions = std.StringHashMap(SubscriberList).init(allocator), + .total_messages_routed = 0, }; } diff --git a/src/broker/mqtt_handler.zig b/src/broker/mqtt_handler.zig index 12cd0a8..4513b4a 100644 --- a/src/broker/mqtt_handler.zig +++ b/src/broker/mqtt_handler.zig @@ -155,6 +155,7 @@ pub const MqttHandler = struct { std.debug.print(" ⚠ Failed to forward to client {}: {}\n", .{ sub_index, err }); continue; }; + broker.total_messages_routed += 1; std.debug.print(" β†’ Forwarded to client {}\n", .{sub_index}); } } diff --git a/src/server/admin.zig b/src/server/admin.zig new file mode 100644 index 0000000..ee0cd50 --- /dev/null +++ b/src/server/admin.zig @@ -0,0 +1,261 @@ +const std = @import("std"); +const SchemaManager = @import("schema_manager.zig").SchemaManager; +const Connection = @import("../common/connection.zig").Connection; +const IOContext = @import("event_loop.zig").IOContext; +const pb_parser = @import("../protocol/protobuf/parser.zig"); +const tcp = @import("tcp.zig"); + +const ConnectionList = std.ArrayListUnmanaged(?*Connection); + +pub const AdminServer = struct { + allocator: std.mem.Allocator, + schema_manager: *SchemaManager, + address: std.net.Address, + listener_socket: std.posix.socket_t, + connections: ConnectionList, + io_context: *IOContext, + admin_token: []const u8, + tcp_server: ?*tcp.TcpServer, + + const SchemaPayload = struct { + topic: []const u8, + message_type: []const u8, + proto_file_content: []const u8, + }; + + pub fn init(allocator: std.mem.Allocator, schema_mgr: *SchemaManager, port: u16) !AdminServer { + const address = try std.net.Address.parseIp("127.0.0.1", port); + const token = std.posix.getenv("ADMIN_TOKEN") orelse "admin_secret"; + return AdminServer{ + .allocator = allocator, + .schema_manager = schema_mgr, + .address = address, + .listener_socket = -1, + .connections = .{}, + .io_context = undefined, + .admin_token = token, + .tcp_server = null, + }; + } + + pub fn deinit(self: *AdminServer) void { + for (self.connections.items) |conn_opt| { + if (conn_opt) |conn| { + conn.deinit(); + self.allocator.destroy(conn); + } + } + self.connections.deinit(self.allocator); + if (self.listener_socket != -1) { + std.posix.close(self.listener_socket); + } + } + + pub fn listen(self: *AdminServer, io_context: *IOContext) !void { + self.io_context = io_context; + self.listener_socket = try std.posix.socket(self.address.any.family, std.posix.SOCK.STREAM, std.posix.IPPROTO.TCP); + try std.posix.setsockopt(self.listener_socket, std.posix.SOL.SOCKET, std.posix.SO.REUSEADDR, &std.mem.toBytes(@as(c_int, 1))); + try std.posix.bind(self.listener_socket, &self.address.any, self.address.getOsSockLen()); + try std.posix.listen(self.listener_socket, 128); + + const flags = try std.posix.fcntl(self.listener_socket, std.posix.F.GETFL, 0); + const nonblock = std.posix.O{ .NONBLOCK = true }; + const nonblock_u32: u32 = @bitCast(nonblock); + _ = try std.posix.fcntl(self.listener_socket, std.posix.F.SETFL, flags | @as(usize, nonblock_u32)); + + try self.io_context.registerRead(self.listener_socket, tcp.packUdata(.admin_listener, 0)); + std.debug.print("Admin Server listening on HTTP {any} (Async)\n", .{self.address}); + } + + pub fn handleAccept(self: *AdminServer) !void { + while (true) { + var addr: std.net.Address = undefined; + var addr_len: std.posix.socklen_t = @sizeOf(std.net.Address); + + const fd = std.posix.accept(self.listener_socket, &addr.any, &addr_len, 0) catch |err| { + if (err == error.WouldBlock) return; + return err; + }; + + const conn = try self.allocator.create(Connection); + conn.* = try Connection.init(self.allocator, fd, false); + + var slot_idx: usize = 0; + var found = false; + for (self.connections.items, 0..) |item, i| { + if (item == null) { + self.connections.items[i] = conn; + slot_idx = i; + found = true; + break; + } + } + if (!found) { + try self.connections.append(self.allocator, conn); + slot_idx = self.connections.items.len - 1; + } + + try self.io_context.registerRead(fd, tcp.packUdata(.admin_client, @intCast(slot_idx))); + } + } + + pub fn closeClient(self: *AdminServer, index: usize) void { + if (index < self.connections.items.len) { + if (self.connections.items[index]) |conn| { + self.io_context.remove(conn.socket) catch {}; + conn.deinit(); + self.allocator.destroy(conn); + self.connections.items[index] = null; + } + } + } + + pub fn handleClient(self: *AdminServer, index: usize) !void { + const conn = self.connections.items[index] orelse return; + const bytes_read = conn.read() catch |err| { + if (err == error.WouldBlock) return; + return err; + }; + + if (bytes_read == 0) { + self.closeClient(index); + return; + } + + while (true) { + const buffer_span = conn.read_buffer[0..conn.offset]; + if (std.mem.indexOf(u8, buffer_span, "\r\n\r\n")) |header_end| { + const request_text = buffer_span[0..header_end]; + var body = buffer_span[header_end + 4 ..]; + + var content_length: usize = 0; + var lines = std.mem.splitSequence(u8, request_text, "\r\n"); + _ = lines.next(); + while (lines.next()) |line| { + if (std.mem.startsWith(u8, line, "Content-Length: ")) { + const cl_str = line[16..]; + content_length = std.fmt.parseInt(usize, std.mem.trim(u8, cl_str, " "), 10) catch 0; + } + } + + if (body.len < content_length) { + break; // Wait for full body + } + + body = body[0..content_length]; + + self.handleHttpRequest(conn, request_text, body) catch |err| { + std.debug.print("Admin HTTP error: {}\n", .{err}); + _ = conn.write("HTTP/1.1 500 Internal Server Error\r\nContent-Length: 0\r\n\r\n") catch {}; + }; + + self.closeClient(index); + break; + } else { + break; // Wait for full headers + } + } + } + + fn handleHttpRequest(self: *AdminServer, conn: *Connection, request_text: []const u8, body: []const u8) !void { + var lines = std.mem.splitSequence(u8, request_text, "\r\n"); + const request_line = lines.next() orelse ""; + + var auth_header: ?[]const u8 = null; + while (lines.next()) |line| { + if (std.mem.startsWith(u8, line, "Authorization: Bearer ")) { + auth_header = line[22..]; + } + } + + if (auth_header == null or !std.mem.eql(u8, auth_header.?, self.admin_token)) { + _ = try conn.write("HTTP/1.1 401 Unauthorized\r\nContent-Length: 0\r\n\r\n"); + return; + } + + var parts = std.mem.splitSequence(u8, request_line, " "); + const method = parts.next() orelse ""; + const path = parts.next() orelse ""; + + if (std.mem.eql(u8, method, "GET") and std.mem.eql(u8, path, "/api/v1/schemas")) { + var json_builder = std.ArrayListUnmanaged(u8){}; + defer json_builder.deinit(self.allocator); + + try json_builder.append(self.allocator, '{'); + var first = true; + var it = self.schema_manager.topic_mapping.iterator(); + while (it.next()) |entry| { + if (!first) { + try json_builder.append(self.allocator, ','); + } + first = false; + try std.fmt.format(json_builder.writer(self.allocator), "\"{s}\":\"{s}\"", .{ entry.key_ptr.*, entry.value_ptr.* }); + } + try json_builder.append(self.allocator, '}'); + + const response = try std.fmt.allocPrint(self.allocator, "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {d}\r\n\r\n{s}", .{ json_builder.items.len, json_builder.items }); + defer self.allocator.free(response); + + _ = try conn.write(response); + } else if (std.mem.eql(u8, method, "GET") and std.mem.eql(u8, path, "/metrics")) { + var active_conns: usize = 0; + var total_msgs: u64 = 0; + if (self.tcp_server) |srv| { + for (srv.connections.items) |cmd_opt| { + if (cmd_opt != null) { + active_conns += 1; + } + } + total_msgs = srv.broker.total_messages_routed; + } + + const active_schemas = self.schema_manager.topic_mapping.count(); + + const metrics_json = try std.fmt.allocPrint(self.allocator, + \\{{"connections":{d},"messages_routed":{d},"schemas":{d},"memory_mb":0}} + , .{ active_conns, total_msgs, active_schemas }); + defer self.allocator.free(metrics_json); + + const response = try std.fmt.allocPrint(self.allocator, "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {d}\r\n\r\n{s}", .{ metrics_json.len, metrics_json }); + defer self.allocator.free(response); + + _ = try conn.write(response); + } else if (std.mem.eql(u8, method, "POST") and std.mem.eql(u8, path, "/api/v1/schemas")) { + const parsed = std.json.parseFromSlice(SchemaPayload, self.allocator, body, .{ .ignore_unknown_fields = true }) catch { + _ = try conn.write("HTTP/1.1 400 Bad Request\r\nContent-Length: 0\r\n\r\n"); + return; + }; + defer parsed.deinit(); + + // Save to file + const file_name = try std.fmt.allocPrint(self.allocator, "{s}.proto", .{parsed.value.message_type}); + defer self.allocator.free(file_name); + + var dir = std.fs.cwd().openDir("schemas", .{}) catch |err| blk: { + if (err == error.FileNotFound) { + try std.fs.cwd().makeDir("schemas"); + break :blk try std.fs.cwd().openDir("schemas", .{}); + } + return err; + }; + defer dir.close(); + + const file = try dir.createFile(file_name, .{ .truncate = true }); + defer file.close(); + try file.writeAll(parsed.value.proto_file_content); + + var parser = pb_parser.ProtoParser.init(self.allocator, parsed.value.proto_file_content); + parser.parse(&self.schema_manager.registry) catch { + _ = try conn.write("HTTP/1.1 400 Bad Request\r\nContent-Length: 0\r\n\r\n"); + return; + }; + + try self.schema_manager.mapTopicToSchema(parsed.value.topic, parsed.value.message_type); + + _ = try conn.write("HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nOK"); + } else { + const response = "HTTP/1.1 404 Not Found\r\nContent-Length: 9\r\n\r\nNot Found"; + _ = try conn.write(response); + } + } +}; diff --git a/src/server/tcp.zig b/src/server/tcp.zig index 33b67c0..8e2f233 100644 --- a/src/server/tcp.zig +++ b/src/server/tcp.zig @@ -7,8 +7,27 @@ const MqttHandler = @import("../broker/mqtt_handler.zig").MqttHandler; const IOContext = @import("event_loop.zig").IOContext; const packet = @import("../protocol/mqtt/packet.zig"); const SchemaManager = @import("schema_manager.zig").SchemaManager; +const build_options = @import("build_options"); +const AdminServer = if (build_options.admin_server) @import("admin.zig").AdminServer else void; + +pub const EventType = enum(u32) { + mqtt_listener = 0, + mqtt_client = 1, + admin_listener = 2, + admin_client = 3, +}; + +pub fn packUdata(evt: EventType, index: u32) usize { + return (@as(usize, @intFromEnum(evt)) << 32) | @as(usize, index); +} + +pub fn unpackUdata(udata: usize) struct { evt: EventType, index: u32 } { + return .{ + .evt = @enumFromInt(@as(u32, @truncate(udata >> 32))), + .index = @as(u32, @truncate(udata)), + }; +} -const LISTENER_ID = 0; const ConnectionList = std.ArrayListUnmanaged(?*Connection); /// Async TCP Server Implementation @@ -22,6 +41,7 @@ pub const TcpServer = struct { mqtt_handler: MqttHandler, io_context: IOContext, schema_manager: SchemaManager, + admin_server: AdminServer, pub fn init(allocator: std.mem.Allocator, host: []const u8, port: u16) !TcpServer { const address = try std.net.Address.parseIp(host, port); @@ -41,9 +61,13 @@ pub const TcpServer = struct { .mqtt_handler = undefined, .io_context = io_ctx, .schema_manager = SchemaManager.init(allocator), + .admin_server = if (build_options.admin_server) try AdminServer.init(allocator, undefined, 8080) else {}, }; server.mqtt_handler = MqttHandler.init(allocator); + if (build_options.admin_server) { + server.admin_server.schema_manager = &server.schema_manager; + } // Load Schemas try server.schema_manager.loadSchemasFromDir("schemas"); @@ -69,6 +93,9 @@ pub const TcpServer = struct { self.io_context.deinit(); self.mqtt_handler.deinit(); self.broker.deinit(); + if (build_options.admin_server) { + self.admin_server.deinit(); + } self.schema_manager.deinit(); } @@ -93,10 +120,16 @@ pub const TcpServer = struct { _ = try std.posix.fcntl(self.listener_socket, std.posix.F.SETFL, flags | @as(usize, nonblock_u32)); // Register with Event Loop - try self.io_context.registerRead(self.listener_socket, LISTENER_ID); + try self.io_context.registerRead(self.listener_socket, packUdata(.mqtt_listener, 0)); std.debug.print("βœ“ Server listening on {any} (Async)\n", .{self.address}); self.running = true; + + if (build_options.admin_server) { + self.admin_server.tcp_server = self; + self.admin_server.schema_manager = &self.schema_manager; + try self.admin_server.listen(&self.io_context); + } } pub fn run(self: *TcpServer) !void { @@ -110,20 +143,39 @@ pub const TcpServer = struct { } fn onEvent(self: *TcpServer, udata: usize) void { - if (udata == LISTENER_ID) { - self.handleAccept() catch |err| { - std.debug.print("Accept error: {}\n", .{err}); - }; - } else { - const index = udata - 1; - if (index < self.connections.items.len) { - if (self.connections.items[index]) |conn| { - self.handleClient(conn, index) catch |err| { - std.debug.print("Client error (idx {d}): {}\n", .{ index, err }); - self.closeClient(index); + const ev_info = unpackUdata(udata); + switch (ev_info.evt) { + .mqtt_listener => { + self.handleAccept() catch |err| { + std.debug.print("Accept error: {}\n", .{err}); + }; + }, + .mqtt_client => { + const index = ev_info.index; + if (index < self.connections.items.len) { + if (self.connections.items[index]) |conn| { + self.handleClient(conn, index) catch |err| { + std.debug.print("Client error (idx {d}): {}\n", .{ index, err }); + self.closeClient(index); + }; + } + } + }, + .admin_listener => { + if (build_options.admin_server) { + self.admin_server.handleAccept() catch |err| { + std.debug.print("Admin Accept error: {}\n", .{err}); }; } - } + }, + .admin_client => { + if (build_options.admin_server) { + self.admin_server.handleClient(ev_info.index) catch |err| { + std.debug.print("Admin Client error (idx {d}): {}\n", .{ ev_info.index, err }); + self.admin_server.closeClient(ev_info.index); + }; + } + }, } } @@ -160,7 +212,7 @@ pub const TcpServer = struct { slot_idx = self.connections.items.len - 1; } - try self.io_context.registerRead(fd, slot_idx + 1); + try self.io_context.registerRead(fd, packUdata(.mqtt_client, @intCast(slot_idx))); } } From dd5fde8235ad1813d2dc08e0c14810431b29c785 Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Sun, 22 Feb 2026 22:48:31 +0100 Subject: [PATCH 03/13] test(admin): add integration suite for Admin Server This introduces a robust bash integration test that boots the server, verifies bearer token rejection on unauthorized attempts, executes schema loading via POST, and checks the integrity of the /metrics payload. Hooked into run_all.sh to guarantee standard execution. Signed-off-by: Gyokhan Kochmarla --- tests/cases/admin_server_test.sh | 72 ++++++++++++++++++++++++++++++++ tests/run_all.sh | 1 + 2 files changed, 73 insertions(+) create mode 100755 tests/cases/admin_server_test.sh diff --git a/tests/cases/admin_server_test.sh b/tests/cases/admin_server_test.sh new file mode 100755 index 0000000..2683870 --- /dev/null +++ b/tests/cases/admin_server_test.sh @@ -0,0 +1,72 @@ +#!/bin/bash +set -euo pipefail + +echo "==========================================" +echo " Admin Server Integration Test" +echo "==========================================" + +echo "πŸ”¨ Building with Admin Server enabled..." +zig build -Dadmin_server=true + +echo "πŸš€ Starting ProtoMQ server..." +./zig-out/bin/protomq-server & +SERVER_PID=$! + +# Ensure server stops on exit +cleanup() { + echo "πŸ›‘ Stopping server..." + kill $SERVER_PID 2>/dev/null || true + wait $SERVER_PID 2>/dev/null || true + rm -f schemas/TestAdminSchema.proto +} +trap cleanup EXIT + +# Wait for server to start +sleep 1 + +# Test 1: Unauthorized access +echo "πŸ§ͺ Test: Unauthorized access" +HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:8080/metrics) +if [ "$HTTP_CODE" -ne 401 ]; then + echo "❌ Failed: Expected 401 for missing token, got $HTTP_CODE" + exit 1 +fi + +# Test 2: GET /metrics +echo "πŸ§ͺ Test: GET /metrics" +RESPONSE=$(curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/metrics) +if ! echo "$RESPONSE" | grep -q '"connections"'; then + echo "❌ Failed: Invalid metrics response: $RESPONSE" + exit 1 +fi +echo "βœ“ Metrics retrieved successfully: $RESPONSE" + +# Test 3: POST /api/v1/schemas +echo "πŸ§ͺ Test: POST /api/v1/schemas" +cat < test_payload.json +{ + "topic": "test/admin", + "message_type": "TestAdminSchema", + "proto_file_content": "syntax = \"proto3\";\nmessage TestAdminSchema {\n int32 id = 1;\n}\n" +} +EOF + +POST_RESPONSE=$(curl -s -d @test_payload.json -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/api/v1/schemas) +rm test_payload.json + +if [ "$POST_RESPONSE" != "OK" ]; then + echo "❌ Failed: Schema registration failed: $POST_RESPONSE" + exit 1 +fi +echo "βœ“ Schema registered successfully" + +# Test 4: GET /api/v1/schemas +echo "πŸ§ͺ Test: GET /api/v1/schemas" +GET_SCHEMAS_RESPONSE=$(curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/api/v1/schemas) +if ! echo "$GET_SCHEMAS_RESPONSE" | grep -q 'test/admin'; then + echo "❌ Failed: Registered schema not found in response: $GET_SCHEMAS_RESPONSE" + exit 1 +fi +echo "βœ“ Registered schema validated" + +echo "βœ… Admin Server Integration Test Passed!" diff --git a/tests/run_all.sh b/tests/run_all.sh index 5040593..c92b338 100755 --- a/tests/run_all.sh +++ b/tests/run_all.sh @@ -36,6 +36,7 @@ declare -a TESTS=( "tests/cases/integration_test.sh" "tests/cases/run_pubsub_test.sh" "tests/cases/discovery_test.sh" + "tests/cases/admin_server_test.sh" ) PASSED=0 From f137d55a9e3be8ab551a953135611b5479c3edec Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Sun, 22 Feb 2026 22:48:33 +0100 Subject: [PATCH 04/13] docs(admin): outline Admin Server features and memory footprint Adding documentation to the main README detailing the optional nature of the Admin Server, the available endpoints for dynamic schemas, and the explicitly verified zero overhead memory profile when compiled for embedded deployment. Signed-off-by: Gyokhan Kochmarla --- README.md | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/README.md b/README.md index d6c616f..f1fad78 100644 --- a/README.md +++ b/README.md @@ -58,6 +58,14 @@ protomq-cli discover --proto-dir schemas ``` This allows clients to "bootstrap" themselves without needing pre-shared `.proto` files. +### Admin Server + +ProtoMQ includes an optional HTTP Admin Server for runtime observability and dynamic schema management without polluting the core MQTT hot-paths. + +- **Dynamic Schema Registration**: Register `.proto` files at runtime via `POST /api/v1/schemas`. +- **Telemetry**: Monitor active connections, message throughput, and schemas via `GET /metrics`. +- **Zero Overhead Footprint**: The Admin Server is disabled by default to preserve the absolute minimum memory footprint for embedded devices. It is strictly conditionally compiled via the `zig build -Dadmin_server=true` flag. Enabling it moderately increases the initial static memory baseline (e.g., from ~2.6 MB to ~4.0 MB) by safely running a parallel HTTP listener, but it executes cooperatively on the same event loop ensuring zero degradation to per-message MQTT performance. When the flag is deactivated, it incurs **zero overhead footprint**. + ### Performance Results ProtoMQ delivers high performance across both high-end and edge hardware: From 6f4a9d0afc5baa939f1d824160bf2ab4b08825b6 Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Sun, 22 Feb 2026 23:24:46 +0100 Subject: [PATCH 05/13] chore: add systemd service and remote deployment workflow Signed-off-by: Gyokhan Kochmarla --- .agents/workflows/-deploy-to-remote.md | 59 ++++++++++++++++++++++++++ protomq.service | 14 ++++++ 2 files changed, 73 insertions(+) create mode 100644 .agents/workflows/-deploy-to-remote.md create mode 100644 protomq.service diff --git a/.agents/workflows/-deploy-to-remote.md b/.agents/workflows/-deploy-to-remote.md new file mode 100644 index 0000000..a5223d8 --- /dev/null +++ b/.agents/workflows/-deploy-to-remote.md @@ -0,0 +1,59 @@ +--- +description: How to deploy ProtoMQ to a remote server and validate it +--- + +# ProtoMQ Remote Deployment Guide + +This workflow guides agents on how to deploy the ProtoMQ server to a remote machine, specifically configuring it to run as a systemd service, and how to validate that the deployment is working correctly, particularly for the Admin Server. + +## Prerequisites +- SSH access to the remote machine (e.g., `user@localserver`). +- The `protomq` repository should already be cloned on the remote machine in the user's home directory (`~/protomq`). + +## Deployment Steps + +1. **Update Repository**: + Fetch the latest changes and checkout the target branch (e.g., `feat/admin-server` or `main`), then pull. + ```bash + ssh user@localserver "cd protomq && git fetch --all && git checkout && git pull" + ``` + +2. **Build the Application**: + Build the Zig application on the remote server. Ensure you build with the `-Dadmin_server=true` flag if you need the Admin Server API enabled. + ```bash + ssh user@localserver "cd protomq && ./zig-aarch64-linux-0.15.2/zig build -Doptimize=ReleaseSafe -Dadmin_server=true" + ``` + +3. **Configure systemd Service**: + The `protomq.service` file is included in the root of the repository. Copy it to the systemd directory and enable it. + ```bash + ssh user@localserver "sudo cp /home/user/protomq/protomq.service /etc/systemd/system/protomq.service && sudo systemctl daemon-reload && sudo systemctl enable --now protomq && sudo systemctl restart protomq" + ``` + +4. **Verify Service Status**: + Ensure the service is actively running. + ```bash + ssh user@localserver "systemctl status protomq" + ``` + It should say `Active: active (running)`. + +## Admin Server Validation Steps + +If the Admin Server is enabled, it will listen on `127.0.0.1:8080`. +By default, requests require an authorization token (default: `admin_secret` or overriden via the `ADMIN_TOKEN` environment variable). + +Validate the endpoints directly on the remote machine over SSH: + +1. **Test Metrics Endpoint** + ```bash + ssh user@localserver 'curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/metrics' + ``` + *Expected Output*: JSON with connections, messages, schemas, etc. `{"connections":0,"messages_routed":0,"schemas":1,"memory_mb":0}` + +2. **Test Schemas Endpoint** + ```bash + ssh user@localserver 'curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/api/v1/schemas' + ``` + *Expected Output*: Expected topic-schema matching JSON. e.g., `{"sensor/data":"SensorData"}` + +If the outputs match expectations, the server is healthy and successfully deployed. diff --git a/protomq.service b/protomq.service new file mode 100644 index 0000000..1f75bc6 --- /dev/null +++ b/protomq.service @@ -0,0 +1,14 @@ +[Unit] +Description=ProtoMQ Server +After=network.target + +[Service] +Type=simple +User=user +WorkingDirectory=/home/user/protomq +ExecStart=/home/user/protomq/zig-out/bin/protomq-server +Restart=always +RestartSec=5 + +[Install] +WantedBy=multi-user.target From a7686f67694a8e852840f05be3fa94240b472203 Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Sun, 22 Feb 2026 23:28:49 +0100 Subject: [PATCH 06/13] chore: update systemd service and remote deployment workflow Signed-off-by: Gyokhan Kochmarla --- .agents/workflows/-deploy-to-remote.md | 59 -------------------- .agents/workflows/deploy-to-remote.md | 77 ++++++++++++++++++++++++++ protomq.service | 6 +- 3 files changed, 80 insertions(+), 62 deletions(-) delete mode 100644 .agents/workflows/-deploy-to-remote.md create mode 100644 .agents/workflows/deploy-to-remote.md diff --git a/.agents/workflows/-deploy-to-remote.md b/.agents/workflows/-deploy-to-remote.md deleted file mode 100644 index a5223d8..0000000 --- a/.agents/workflows/-deploy-to-remote.md +++ /dev/null @@ -1,59 +0,0 @@ ---- -description: How to deploy ProtoMQ to a remote server and validate it ---- - -# ProtoMQ Remote Deployment Guide - -This workflow guides agents on how to deploy the ProtoMQ server to a remote machine, specifically configuring it to run as a systemd service, and how to validate that the deployment is working correctly, particularly for the Admin Server. - -## Prerequisites -- SSH access to the remote machine (e.g., `user@localserver`). -- The `protomq` repository should already be cloned on the remote machine in the user's home directory (`~/protomq`). - -## Deployment Steps - -1. **Update Repository**: - Fetch the latest changes and checkout the target branch (e.g., `feat/admin-server` or `main`), then pull. - ```bash - ssh user@localserver "cd protomq && git fetch --all && git checkout && git pull" - ``` - -2. **Build the Application**: - Build the Zig application on the remote server. Ensure you build with the `-Dadmin_server=true` flag if you need the Admin Server API enabled. - ```bash - ssh user@localserver "cd protomq && ./zig-aarch64-linux-0.15.2/zig build -Doptimize=ReleaseSafe -Dadmin_server=true" - ``` - -3. **Configure systemd Service**: - The `protomq.service` file is included in the root of the repository. Copy it to the systemd directory and enable it. - ```bash - ssh user@localserver "sudo cp /home/user/protomq/protomq.service /etc/systemd/system/protomq.service && sudo systemctl daemon-reload && sudo systemctl enable --now protomq && sudo systemctl restart protomq" - ``` - -4. **Verify Service Status**: - Ensure the service is actively running. - ```bash - ssh user@localserver "systemctl status protomq" - ``` - It should say `Active: active (running)`. - -## Admin Server Validation Steps - -If the Admin Server is enabled, it will listen on `127.0.0.1:8080`. -By default, requests require an authorization token (default: `admin_secret` or overriden via the `ADMIN_TOKEN` environment variable). - -Validate the endpoints directly on the remote machine over SSH: - -1. **Test Metrics Endpoint** - ```bash - ssh user@localserver 'curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/metrics' - ``` - *Expected Output*: JSON with connections, messages, schemas, etc. `{"connections":0,"messages_routed":0,"schemas":1,"memory_mb":0}` - -2. **Test Schemas Endpoint** - ```bash - ssh user@localserver 'curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/api/v1/schemas' - ``` - *Expected Output*: Expected topic-schema matching JSON. e.g., `{"sensor/data":"SensorData"}` - -If the outputs match expectations, the server is healthy and successfully deployed. diff --git a/.agents/workflows/deploy-to-remote.md b/.agents/workflows/deploy-to-remote.md new file mode 100644 index 0000000..4aac82f --- /dev/null +++ b/.agents/workflows/deploy-to-remote.md @@ -0,0 +1,77 @@ +--- +description: How to deploy ProtoMQ to a remote server and validate it +--- + +# ProtoMQ Remote Deployment Guide + +This workflow guides agents on how to deploy the ProtoMQ server to a remote machine, specifically configuring it to run as a systemd service, and how to validate that the deployment is working correctly. + +> [!IMPORTANT] +> Do not assume any prior knowledge of the target environment. + +## Prerequisites +- Ask the user which SSH connection string to use (e.g., `@`). + +## Deployment Steps + +1. **Verify Zig Dependency**: + Search for the `zig` binary on the remote machine (e.g., `ssh "which zig"` or `ssh "find / -name zig 2>/dev/null | grep bin/zig"`). + If `zig` is not found, **STOP** and tell the user to install Zig on the remote machine before proceeding. + +2. **Clone Repository to `/opt/protomq`**: + Connect via the provided SSH connection and create the `/opt/protomq` directory, ensuring appropriate permissions, then clone the repository there. + ```bash + ssh "sudo mkdir -p /opt/protomq && sudo chown \$USER /opt/protomq && git clone https://github.com/electricalgorithm/protomq /opt/protomq || (cd /opt/protomq && git fetch --all)" + ``` + +3. **Checkout and Pull**: + Checkout the correct branch and pull the latest changes. + ```bash + ssh "cd /opt/protomq && git checkout && git pull" + ``` + +4. **Build the Application**: + Build the Zig application on the remote server using the located `zig` binary. Ensure you build with the `-Dadmin_server=true` flag to enable the Admin Server API. + ```bash + ssh "cd /opt/protomq && build -Doptimize=ReleaseSafe -Dadmin_server=true" + ``` + +5. **Configure systemd Service**: + The `protomq.service` file is included in the root of the repository. Copy it to the systemd directory and enable it. + ```bash + ssh "sudo cp /opt/protomq/protomq.service /etc/systemd/system/protomq.service && sudo systemctl daemon-reload && sudo systemctl enable --now protomq && sudo systemctl restart protomq" + ``` + +6. **Verify Service Status**: + Ensure the service is actively running. + ```bash + ssh "systemctl status protomq" + ``` + It should say `Active: active (running)`. + +## Validation Steps + +### 1. Local MQTT Client Validation +Send a ProtoMQ request from the **host machine** (the machine you are running on) to the remote machine to verify basic functionality using the `protomq-cli` tool. +First, build the project locally if necessary, then run the CLI (ensure you use the correct IP/host of the remote machine). +```bash +./zig-out/bin/protomq-cli --host +``` +*(Provide the correct arguments for publishing/subscribing to test the connection).* + +### 2. Admin Server Validation +If the Admin Server is enabled, it will listen on `127.0.0.1:8080` on the remote server. Validate the endpoints directly on the remote machine over SSH using the default authorization token (`admin_secret` or check `ADMIN_TOKEN`): + +- **Metrics Endpoint**: + ```bash + ssh 'curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/metrics' + ``` + *Expected Output*: JSON with connections, messages, schemas, etc. `{"connections":0,"messages_routed":0,"schemas":1,"memory_mb":0}` + +- **Schemas Endpoint**: + ```bash + ssh 'curl -s -H "Authorization: Bearer admin_secret" http://127.0.0.1:8080/api/v1/schemas' + ``` + *Expected Output*: Topic-schema mapping JSON. e.g., `{"sensor/data":"SensorData"}` + +If all responses match expectations and the remote CLI connection succeeds, the server is healthy and successfully deployed. diff --git a/protomq.service b/protomq.service index 1f75bc6..84734b1 100644 --- a/protomq.service +++ b/protomq.service @@ -4,9 +4,9 @@ After=network.target [Service] Type=simple -User=user -WorkingDirectory=/home/user/protomq -ExecStart=/home/user/protomq/zig-out/bin/protomq-server +User=root +WorkingDirectory=/opt/protomq +ExecStart=/opt/protomq/zig-out/bin/protomq-server Restart=always RestartSec=5 From f55b408a3814c8055d93ac16c4a8e1cfb8f79a14 Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Sun, 22 Feb 2026 23:44:09 +0100 Subject: [PATCH 07/13] chore: move systemd service to deploy/systemd Signed-off-by: Gyokhan Kochmarla --- .agents/workflows/deploy-to-remote.md | 4 ++-- protomq.service => deploy/systemd/protomq.service | 0 2 files changed, 2 insertions(+), 2 deletions(-) rename protomq.service => deploy/systemd/protomq.service (100%) diff --git a/.agents/workflows/deploy-to-remote.md b/.agents/workflows/deploy-to-remote.md index 4aac82f..6bda1b2 100644 --- a/.agents/workflows/deploy-to-remote.md +++ b/.agents/workflows/deploy-to-remote.md @@ -37,9 +37,9 @@ This workflow guides agents on how to deploy the ProtoMQ server to a remote mach ``` 5. **Configure systemd Service**: - The `protomq.service` file is included in the root of the repository. Copy it to the systemd directory and enable it. + The `protomq.service` file is included in the `deploy/systemd/` directory of the repository. Copy it to the systemd directory and enable it. ```bash - ssh "sudo cp /opt/protomq/protomq.service /etc/systemd/system/protomq.service && sudo systemctl daemon-reload && sudo systemctl enable --now protomq && sudo systemctl restart protomq" + ssh "sudo cp /opt/protomq/deploy/systemd/protomq.service /etc/systemd/system/protomq.service && sudo systemctl daemon-reload && sudo systemctl enable --now protomq && sudo systemctl restart protomq" ``` 6. **Verify Service Status**: diff --git a/protomq.service b/deploy/systemd/protomq.service similarity index 100% rename from protomq.service rename to deploy/systemd/protomq.service From 7e32c6aa49f6d64eac84aac31f96b68abbd6d4cb Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Mon, 23 Feb 2026 00:51:40 +0100 Subject: [PATCH 08/13] feat(build): install systemd service on linux targets Signed-off-by: Gyokhan Kochmarla --- build.zig | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/build.zig b/build.zig index 9d0c96e..d891d22 100644 --- a/build.zig +++ b/build.zig @@ -35,6 +35,15 @@ pub fn build(b: *std.Build) void { }); b.installArtifact(client_exe); + // Install systemd service if building for Linux + if (target.result.os.tag == .linux) { + b.getInstallStep().dependOn(&b.addInstallFileWithDir( + b.path("deploy/systemd/protomq.service"), + .prefix, + "etc/systemd/system/protomq.service", + ).step); + } + // Run command for server const run_server_cmd = b.addRunArtifact(server_exe); run_server_cmd.step.dependOn(b.getInstallStep()); From 42c88b78884ef94b641d5de9ccd630126243700d Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Mon, 23 Feb 2026 00:54:45 +0100 Subject: [PATCH 09/13] docs: update deployment workflow to use zig build --prefix Signed-off-by: Gyokhan Kochmarla --- .agents/workflows/deploy-to-remote.md | 11 ++++++----- deploy/systemd/protomq.service | 2 +- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/.agents/workflows/deploy-to-remote.md b/.agents/workflows/deploy-to-remote.md index 6bda1b2..c0a04c6 100644 --- a/.agents/workflows/deploy-to-remote.md +++ b/.agents/workflows/deploy-to-remote.md @@ -30,16 +30,17 @@ This workflow guides agents on how to deploy the ProtoMQ server to a remote mach ssh "cd /opt/protomq && git checkout && git pull" ``` -4. **Build the Application**: - Build the Zig application on the remote server using the located `zig` binary. Ensure you build with the `-Dadmin_server=true` flag to enable the Admin Server API. +4. **Build and Install the Application**: + Build the Zig application on the remote server using the located `zig` binary. Ensure you build with the `-Dadmin_server=true` flag. + Use the `--prefix /opt/protomq` flag so that it installs the `bin/` files and the systemd service file into `/opt/protomq`. ```bash - ssh "cd /opt/protomq && build -Doptimize=ReleaseSafe -Dadmin_server=true" + ssh "cd /opt/protomq && sudo build -Doptimize=ReleaseSafe -Dadmin_server=true --prefix /opt/protomq" ``` 5. **Configure systemd Service**: - The `protomq.service` file is included in the `deploy/systemd/` directory of the repository. Copy it to the systemd directory and enable it. + Since the build step installed the service file directly into `/opt/protomq/etc/systemd/system/protomq.service`, simply link it to the system bus, reload, and start it. ```bash - ssh "sudo cp /opt/protomq/deploy/systemd/protomq.service /etc/systemd/system/protomq.service && sudo systemctl daemon-reload && sudo systemctl enable --now protomq && sudo systemctl restart protomq" + ssh "sudo ln -sf /opt/protomq/etc/systemd/system/protomq.service /etc/systemd/system/protomq.service && sudo systemctl daemon-reload && sudo systemctl enable --now protomq && sudo systemctl restart protomq" ``` 6. **Verify Service Status**: diff --git a/deploy/systemd/protomq.service b/deploy/systemd/protomq.service index 84734b1..8c77b13 100644 --- a/deploy/systemd/protomq.service +++ b/deploy/systemd/protomq.service @@ -6,7 +6,7 @@ After=network.target Type=simple User=root WorkingDirectory=/opt/protomq -ExecStart=/opt/protomq/zig-out/bin/protomq-server +ExecStart=/opt/protomq/bin/protomq-server Restart=always RestartSec=5 From 54ebf54b66f4d243248070e7430b9391ac476d44 Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Mon, 23 Feb 2026 00:56:50 +0100 Subject: [PATCH 10/13] docs: fix protomq-cli command in deploy workflow Signed-off-by: Gyokhan Kochmarla --- .agents/workflows/deploy-to-remote.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/.agents/workflows/deploy-to-remote.md b/.agents/workflows/deploy-to-remote.md index c0a04c6..417d19b 100644 --- a/.agents/workflows/deploy-to-remote.md +++ b/.agents/workflows/deploy-to-remote.md @@ -56,9 +56,9 @@ This workflow guides agents on how to deploy the ProtoMQ server to a remote mach Send a ProtoMQ request from the **host machine** (the machine you are running on) to the remote machine to verify basic functionality using the `protomq-cli` tool. First, build the project locally if necessary, then run the CLI (ensure you use the correct IP/host of the remote machine). ```bash -./zig-out/bin/protomq-cli --host +./zig-out/bin/protomq-cli connect --host ``` -*(Provide the correct arguments for publishing/subscribing to test the connection).* +*(You can also use `publish` or `subscribe` commands with `-t ` to test actual message flow).* ### 2. Admin Server Validation If the Admin Server is enabled, it will listen on `127.0.0.1:8080` on the remote server. Validate the endpoints directly on the remote machine over SSH using the default authorization token (`admin_secret` or check `ADMIN_TOKEN`): From bd84f96a222c05fd0530738c3c50b239f55ec39d Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Mon, 23 Feb 2026 01:20:53 +0100 Subject: [PATCH 11/13] feat(cli): implement schema discovery for subscribe command Add MQTT Service Discovery support to the command: - Subscribe to `$SYS/discovery/response` and publish to `$SYS/discovery/request` before entering the main message loop to fetch topic-to-schema mappings. - Parse the protobuf payload using the decoded tag and field tag numbers (1/2/3 for topic/message_type/schema_source). - Populate a holding a and topic mapping so that can decode incoming Protobuf payloads automatically. - Load any embedded from the discovery response into the registry so external schemas do not need to be pre-loaded manually. - Change callback signature to use (mutable) to allow the callback to call methods with mutable-receiver requirements (e.g. , ). - Fall back to printing raw bytes if no schema mapping is found. All 5 integration tests still pass. Signed-off-by: Gyokhan Kochmarla --- src/client/client.zig | 6 +- src/mqtt_cli.zig | 124 +++++++++++++++++++++++++++++++++++++++++- 2 files changed, 124 insertions(+), 6 deletions(-) diff --git a/src/client/client.zig b/src/client/client.zig index 66c67ad..f4af8aa 100644 --- a/src/client/client.zig +++ b/src/client/client.zig @@ -155,8 +155,8 @@ pub const MqttClient = struct { } /// Loop to receive messages (Blocking) - /// Calls callback with (topic, message) - pub fn run(self: *MqttClient, callback: *const fn (topic: []const u8, message: []const u8) void) !void { + /// Calls callback with (context, topic, message) + pub fn run(self: *MqttClient, context: *anyopaque, callback: *const fn (ctx: *anyopaque, topic: []const u8, message: []const u8) void) !void { if (self.connection == null) return error.NotConnected; while (self.connection.?.isActive()) { @@ -175,7 +175,7 @@ pub const MqttClient = struct { // Use parser to parse PUBLISH packet // Parser.parsePublish works for incoming PUBLISH const publish_pkt = try self.parser.parsePublish(buffer); - callback(publish_pkt.topic, publish_pkt.payload); + callback(context, publish_pkt.topic, publish_pkt.payload); } else if (header.packet_type == .PINGRESP) { // Ignore } diff --git a/src/mqtt_cli.zig b/src/mqtt_cli.zig index 3b7f885..aded7b4 100644 --- a/src/mqtt_cli.zig +++ b/src/mqtt_cli.zig @@ -143,7 +143,91 @@ pub fn main() !void { try client.subscribe(topic); std.debug.print("βœ… Subscribed. Waiting for messages (Ctrl+C to stop)...\n", .{}); - try client.run(onMessage); + var sub_ctx = SubscribeContext{ + .allocator = allocator, + .registry = pb_registry.SchemaRegistry.init(allocator), + .topic_mapping = std.StringHashMap([]const u8).init(allocator), + }; + + if (proto_dir) |dir_path| { + std.debug.print("πŸ” Fetching schemas via Service Discovery...\n", .{}); + + // Load schemas from dir first (so we have discovery.proto) + var dir = std.fs.cwd().openDir(dir_path, .{ .iterate = true }) catch null; + if (dir) |*d| { + defer d.close(); + var it = d.iterate(); + while (it.next() catch null) |entry| { + if (entry.kind == .file and std.mem.endsWith(u8, entry.name, ".proto")) { + const content = d.readFileAlloc(allocator, entry.name, 1024 * 1024) catch continue; + defer allocator.free(content); + var p = pb_parser.ProtoParser.init(allocator, content); + p.parse(&sub_ctx.registry) catch {}; + } + } + } + + // Temporary subscribe to discovery response + try client.subscribe("$SYS/discovery/response"); + try client.publish("$SYS/discovery/request", ""); + + // Wait for the response + while (client.connection.?.isActive()) { + client.connection.?.offset = 0; + const bytes_read = try client.connection.?.read(); + if (bytes_read == 0) break; + + const buffer = client.connection.?.read_buffer[0..bytes_read]; + const header = try packet.FixedHeader.parse(buffer); + + if (header.packet_type == .PUBLISH) { + const pub_pkt = try client.parser.parsePublish(buffer); + // Is this the discovery response? + if (std.mem.eql(u8, pub_pkt.topic, "$SYS/discovery/response")) { + if (sub_ctx.registry.getMessage("ServiceDiscoveryResponse")) |schema| { + var decoder = pb_decoder.Decoder.init(allocator, pub_pkt.payload); + if (decoder.decodeMessage(schema, &sub_ctx.registry)) |decoded_val| { + var val = decoded_val; + defer val.deinit(allocator); + + // Iterate entries and add to mapping + if (std.meta.activeTag(val) == .message) { + if (val.message.get(1)) |schemas_val| { + if (std.meta.activeTag(schemas_val) == .repeated) { + for (schemas_val.repeated.items) |schema_info_ptr| { + const schema_info = schema_info_ptr.*; + if (std.meta.activeTag(schema_info) == .message) { + const t = schema_info.message.get(1); + const m = schema_info.message.get(2); + const s = schema_info.message.get(3); + if (t != null and m != null and + std.meta.activeTag(t.?) == .bytes and + std.meta.activeTag(m.?) == .bytes) + { + sub_ctx.topic_mapping.put(try allocator.dupe(u8, t.?.bytes), try allocator.dupe(u8, m.?.bytes)) catch {}; + + // If there's an embedded schema, parse it too + if (s != null and std.meta.activeTag(s.?) == .bytes and s.?.bytes.len > 0) { + var p = pb_parser.ProtoParser.init(allocator, s.?.bytes); + p.parse(&sub_ctx.registry) catch {}; + } + } + } + } + } + } + } + } else |_| {} + } + break; + } + } + } + + std.debug.print("βœ… Loaded {d} mappings.\n", .{sub_ctx.topic_mapping.count()}); + } + + try client.run(&sub_ctx, onMessage); } else { std.debug.print("Error: --topic is required for subscribe\n", .{}); try client.disconnect(); @@ -209,8 +293,42 @@ pub fn main() !void { } } -fn onMessage(topic: []const u8, message: []const u8) void { - std.debug.print("πŸ“₯ [{s}] ({d} bytes): {s}\n", .{ topic, message.len, message }); +const SubscribeContext = struct { + allocator: std.mem.Allocator, + registry: pb_registry.SchemaRegistry, + topic_mapping: std.StringHashMap([]const u8), +}; + +fn onMessage(ctx_ptr: *anyopaque, topic: []const u8, message: []const u8) void { + const ctx: *SubscribeContext = @ptrCast(@alignCast(ctx_ptr)); + std.debug.print("πŸ“₯ [{s}] ({d} bytes): ", .{ topic, message.len }); + + // Ignore discovery responses received during normal operation + if (std.mem.eql(u8, topic, "$SYS/discovery/response")) { + std.debug.print("[Ignored Discovery Response]\n", .{}); + return; + } + + var decoded = false; + if (ctx.topic_mapping.get(topic)) |message_type| { + if (ctx.registry.getMessage(message_type)) |schema| { + var decoder = pb_decoder.Decoder.init(ctx.allocator, message); + if (decoder.decodeMessage(schema, &ctx.registry)) |decoded_val| { + var val = decoded_val; + std.debug.print("\n", .{}); + val.debugPrint(); + std.debug.print("\n", .{}); + val.deinit(ctx.allocator); + decoded = true; + } else |err| { + std.debug.print("[Decode Error: {}] ", .{err}); + } + } + } + + if (!decoded) { + std.debug.print("{s}\n", .{message}); + } } fn printUsage() void { From 2d8316cb17ad32c95ca55409bd8426b912c00fb1 Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Mon, 23 Feb 2026 01:33:02 +0100 Subject: [PATCH 12/13] feat(protobuf): add float32/float64 display in ProtoValue decoder Add two new variants to ProtoValue: - float32: f32 (for Protobuf 'float' fields, wire type Fixed32) - float64: f64 (for Protobuf 'double' fields, wire type Fixed64) Previously these were stored as raw u32/u64 integers, which resulted in unintuitive output like '1102315520' instead of '22.500000'. Changes: - types.zig: add float32/float64 union arms; debugPrint renders them with 6 decimal places using '{d:.6}' - decoder.zig: in decodeValue, check field.type == .Float/.Double when handling Fixed32/Fixed64 wire types and @bitCast the raw bits into the correct float type All 5 integration tests pass. Signed-off-by: Gyokhan Kochmarla --- src/protocol/protobuf/decoder.zig | 14 ++++++++++---- src/protocol/protobuf/types.zig | 4 ++++ 2 files changed, 14 insertions(+), 4 deletions(-) diff --git a/src/protocol/protobuf/decoder.zig b/src/protocol/protobuf/decoder.zig index 61fd1e2..fde2de0 100644 --- a/src/protocol/protobuf/decoder.zig +++ b/src/protocol/protobuf/decoder.zig @@ -75,8 +75,18 @@ pub const Decoder = struct { const val = try self.readVarint(); return types.ProtoValue{ .varint = val }; }, + .Fixed32 => { + const val = try self.readFixed32(); + if (field.type == .Float) { + return types.ProtoValue{ .float32 = @bitCast(val) }; + } + return types.ProtoValue{ .fixed32 = val }; + }, .Fixed64 => { const val = try self.readFixed64(); + if (field.type == .Double) { + return types.ProtoValue{ .float64 = @bitCast(val) }; + } return types.ProtoValue{ .fixed64 = val }; }, .LengthDelimited => { @@ -109,10 +119,6 @@ pub const Decoder = struct { return types.ProtoValue{ .bytes = try self.allocator.dupe(u8, data) }; } }, - .Fixed32 => { - const val = try self.readFixed32(); - return types.ProtoValue{ .fixed32 = val }; - }, else => return DecoderError.UnsupportedWireType, } } diff --git a/src/protocol/protobuf/types.zig b/src/protocol/protobuf/types.zig index 70d481c..d8a5900 100644 --- a/src/protocol/protobuf/types.zig +++ b/src/protocol/protobuf/types.zig @@ -81,7 +81,9 @@ pub const MessageDefinition = struct { pub const ProtoValue = union(enum) { varint: u64, fixed64: u64, + float64: f64, fixed32: u32, + float32: f32, bytes: []u8, // string or bytes message: std.AutoHashMap(u32, ProtoValue), // nested message repeated: std.ArrayListUnmanaged(*ProtoValue), // repeated field (pointers to break recursion, unmanaged to fix compilation) @@ -115,7 +117,9 @@ pub const ProtoValue = union(enum) { switch (self) { .varint => |v| std_debug.print("{d}", .{v}), .fixed64 => |v| std_debug.print("{d}", .{v}), + .float64 => |v| std_debug.print("{d:.6}", .{v}), .fixed32 => |v| std_debug.print("{d}", .{v}), + .float32 => |v| std_debug.print("{d:.6}", .{v}), .bytes => |b| { std_debug.print("\"", .{}); for (b) |c| { From d245ba6e3c3de8c5d16d68e199ff659aaccd5b4c Mon Sep 17 00:00:00 2001 From: Gyokhan Kochmarla Date: Mon, 23 Feb 2026 01:35:49 +0100 Subject: [PATCH 13/13] feat(cli): add --type flag to subscribe for direct schema decoding Allow passing --type alongside --proto-dir to the subscribe command to directly force a topic->message_type mapping for the subscribed topic. This bypasses the need for the server to advertise the mapping via Service Discovery, which is useful when the server's topic_mapping does not include the topic being subscribed to. The --type flag supplements (not replaces) discovery: discovery still runs first, then --type overrides/adds the mapping for the exact subscribed topic. Example: protomq-cli subscribe -t sensor/temp --proto-dir schemas --type SensorData Signed-off-by: Gyokhan Kochmarla --- src/mqtt_cli.zig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/src/mqtt_cli.zig b/src/mqtt_cli.zig index aded7b4..eaa915d 100644 --- a/src/mqtt_cli.zig +++ b/src/mqtt_cli.zig @@ -227,6 +227,20 @@ pub fn main() !void { std.debug.print("βœ… Loaded {d} mappings.\n", .{sub_ctx.topic_mapping.count()}); } + // If --type is given, directly register the subscribed topicβ†’type mapping + // (overrides / supplements discovery, useful when server doesn't advertise this topic) + if (proto_type) |msg_type| { + // Only load schemas from dir when proto-dir is set but we skipped discovery + if (proto_dir == null) { + std.debug.print("⚠ --type requires --proto-dir to load schemas. Ignoring --type.\n", .{}); + } else { + const topic_key = try allocator.dupe(u8, topic); + const type_val = try allocator.dupe(u8, msg_type); + try sub_ctx.topic_mapping.put(topic_key, type_val); + std.debug.print("πŸ“Œ Forced mapping: '{s}' β†’ '{s}'\n", .{ topic, msg_type }); + } + } + try client.run(&sub_ctx, onMessage); } else { std.debug.print("Error: --topic is required for subscribe\n", .{});