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| 1 | const std = @import("std"); |
| 2 | const builtin = @import("builtin"); |
| 3 | const tracer = @import("./mod.zig"); |
| 4 | const root = @import("root"); |
| 5 | const nfs = @import("nfs"); |
| 6 | const nio = @import("nio"); |
| 7 | const time = @import("time"); |
| 8 | const extras = @import("extras"); |
| 9 | |
| 10 | const sys = switch (builtin.target.os.tag) { |
| 11 | .linux => @import("sys-linux"), |
| 12 | else => unreachable, |
| 13 | }; |
| 14 | |
| 15 | // export OTEL_EXPORTER_OTLP_PROTOCOL=grpc |
| 16 | // export OTEL_EXPORTER_OTLP_PROTOCOL=http/json |
| 17 | // export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf |
| 18 | // export OTEL_EXPORTER_OTLP_ENDPOINT=http://127.0.0.1:4318 |
| 19 | // export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://localhost:4318/v1/traces |
| 20 | |
| 21 | pub fn init(args: struct {}) !void { |
| 22 | _ = args; |
| 23 | } |
| 24 | |
| 25 | pub fn deinit() void { |
| 26 | _ = {}; |
| 27 | } |
| 28 | |
| 29 | threadlocal var allocator: std.mem.Allocator = undefined; |
| 30 | threadlocal var memfd: nfs.File = undefined; |
| 31 | threadlocal var buffered_writer: nio.BufferedWriter(4096, nfs.File) = undefined; |
| 32 | threadlocal var trace_id: [16]u8 = undefined; |
| 33 | threadlocal var prev_span_id: ?[8]u8 = undefined; |
| 34 | threadlocal var spans: std.ArrayListUnmanaged([]const u8) = .empty; |
| 35 | |
| 36 | pub fn init_thread(args: struct { std.mem.Allocator }) !void { |
| 37 | std.log.debug("called otel init_thread", .{}); |
| 38 | allocator = args[0]; |
| 39 | memfd = try nfs.memfd_create("zig-tracer", 0); |
| 40 | buffered_writer = .init(memfd); |
| 41 | trace_id = extras.randomBytes(16); |
| 42 | prev_span_id = null; |
| 43 | |
| 44 | // try write_tag(1, .varint); |
| 45 | // try write_varint(150); |
| 46 | // 0896 01 |
| 47 | // 1: 150 |
| 48 | |
| 49 | // try write_tag(2, .len); |
| 50 | // try write_varint(7); |
| 51 | // try buffered_writer.writeAll("testing"); |
| 52 | // 1207 7465 7374 696e 67 |
| 53 | // 2: {"testing"} |
| 54 | |
| 55 | // try write_tag(3, .len); |
| 56 | // try write_varint(3); |
| 57 | // try write_tag(1, .varint); |
| 58 | // try write_varint(150); |
| 59 | // 1a03 0896 01 |
| 60 | // 3: {1: 150} |
| 61 | |
| 62 | // try write_tag(4, .len); |
| 63 | // try write_varint(5); |
| 64 | // try buffered_writer.writeAll("hello"); |
| 65 | // try write_tag(6, .varint); |
| 66 | // try write_varint(3); |
| 67 | // try write_tag(6, .varint); |
| 68 | // try write_varint(270); |
| 69 | // try write_tag(6, .varint); |
| 70 | // try write_varint(86942); |
| 71 | // 2205 6865 6c6c 6f30 0330 8e02 309e a705 |
| 72 | // 4: {"hello"} |
| 73 | // 6: 3 |
| 74 | // 6: 270 |
| 75 | // 6: 86942 |
| 76 | |
| 77 | // try write_tag(3, .sgroup); |
| 78 | // try write_tag(1, .varint); |
| 79 | // try write_varint(150); |
| 80 | // try write_tag(3, .egroup); |
| 81 | // 1b08 9601 1c |
| 82 | // 3: !{1: 150} |
| 83 | |
| 84 | // try write_tag(4, .sgroup); |
| 85 | // try write_tag(3, .sgroup); |
| 86 | // try write_tag(1, .varint); |
| 87 | // try write_varint(150); |
| 88 | // try write_tag(3, .egroup); |
| 89 | // try write_tag(4, .egroup); |
| 90 | // 231b 0896 011c 24 |
| 91 | // 4: !{3: !{1: 150}} |
| 92 | |
| 93 | } |
| 94 | |
| 95 | pub fn deinit_thread() void { |
| 96 | buffered_writer.flush() catch {}; |
| 97 | memfd.close(); |
| 98 | } |
| 99 | |
| 100 | pub fn trace_begin(src: std.builtin.SourceLocation, comptime ifmt: []const u8, iargs: anytype) Data { |
| 101 | const span_id = extras.randomBytes(8); |
| 102 | const parent_id = prev_span_id; |
| 103 | prev_span_id = span_id; |
| 104 | const fmt = "{s}:{d}:{d} ({s})" ++ ifmt; |
| 105 | const args = .{ src.file, src.line, src.column, src.fn_name } ++ iargs; |
| 106 | const name = std.fmt.allocPrint(allocator, fmt, args) catch ""; |
| 107 | const time_start_ns: u64 = @intCast(time.nanoTimestamp()); // this will overflow 2554 July 21 23:34:33.709 Z |
| 108 | |
| 109 | return .{ |
| 110 | .span_id = span_id, |
| 111 | .parent_id = parent_id, |
| 112 | .name = name, |
| 113 | .time_start_ns = time_start_ns, |
| 114 | }; |
| 115 | } |
| 116 | |
| 117 | pub fn trace_end(ctx: tracer.Ctx) void { |
| 118 | trace_end_inner(ctx) catch {}; |
| 119 | } |
| 120 | fn trace_end_inner(ctx: tracer.Ctx) !void { |
| 121 | var temp: std.ArrayListUnmanaged(u8) = .empty; |
| 122 | defer temp.deinit(allocator); |
| 123 | const w = temp.writer(allocator); |
| 124 | try writef_bytes(w, 1, &trace_id); |
| 125 | try writef_bytes(w, 2, &ctx.data.span_id); |
| 126 | if (ctx.data.parent_id) |*pi| try writef_bytes(w, 4, pi); |
| 127 | try writef_string(w, 5, ctx.data.name); |
| 128 | if (ctx.data.name.len > 0) allocator.free(ctx.data.name); |
| 129 | try writef_varint(w, 6, 2); |
| 130 | try writef_varint(w, 7, ctx.data.time_start_ns); |
| 131 | try writef_varint(w, 8, @intCast(time.nanoTimestamp())); |
| 132 | try spans.append(allocator, temp.items); |
| 133 | } |
| 134 | |
| 135 | pub const Data = struct { |
| 136 | span_id: [8]u8, |
| 137 | parent_id: ?[8]u8, |
| 138 | name: []const u8, |
| 139 | time_start_ns: u64, |
| 140 | }; |
| 141 | |
| 142 | // |
| 143 | // |
| 144 | |
| 145 | // https://github.com/open-telemetry/opentelemetry-proto/tree/v1.10.0/opentelemetry/proto |
| 146 | |
| 147 | // message ExportTraceServiceRequest { |
| 148 | // repeated opentelemetry.proto.trace.v1.ResourceSpans resource_spans = 1; |
| 149 | // } |
| 150 | |
| 151 | // message ResourceSpans { |
| 152 | // reserved 1000; |
| 153 | // opentelemetry.proto.resource.v1.Resource resource = 1; |
| 154 | // repeated ScopeSpans scope_spans = 2; |
| 155 | // string schema_url = 3; |
| 156 | // } |
| 157 | |
| 158 | // message Resource { |
| 159 | // repeated opentelemetry.proto.common.v1.KeyValue attributes = 1; |
| 160 | // uint32 dropped_attributes_count = 2; |
| 161 | // } |
| 162 | |
| 163 | // message KeyValue { |
| 164 | // string key = 1; |
| 165 | // AnyValue value = 2; |
| 166 | // } |
| 167 | |
| 168 | // message AnyValue { |
| 169 | // oneof value { |
| 170 | // string string_value = 1; |
| 171 | // bool bool_value = 2; |
| 172 | // int64 int_value = 3; |
| 173 | // double double_value = 4; |
| 174 | // ArrayValue array_value = 5; |
| 175 | // KeyValueList kvlist_value = 6; |
| 176 | // bytes bytes_value = 7; |
| 177 | // } |
| 178 | // } |
| 179 | |
| 180 | // message ArrayValue { |
| 181 | // repeated AnyValue values = 1; |
| 182 | // } |
| 183 | |
| 184 | // message KeyValueList { |
| 185 | // repeated KeyValue values = 1; |
| 186 | // } |
| 187 | |
| 188 | // message ScopeSpans { |
| 189 | // opentelemetry.proto.common.v1.InstrumentationScope scope = 1; |
| 190 | // repeated Span spans = 2; |
| 191 | // string schema_url = 3; |
| 192 | // } |
| 193 | |
| 194 | // message InstrumentationScope { |
| 195 | // string name = 1; |
| 196 | // string version = 2; |
| 197 | // repeated KeyValue attributes = 3; |
| 198 | // uint32 dropped_attributes_count = 4; |
| 199 | // } |
| 200 | |
| 201 | // message Span { |
| 202 | // bytes trace_id = 1; |
| 203 | // bytes span_id = 2; |
| 204 | // string trace_state = 3; |
| 205 | // bytes parent_span_id = 4; |
| 206 | // fixed32 flags = 16; |
| 207 | // string name = 5; |
| 208 | // SpanKind kind = 6; |
| 209 | // fixed64 start_time_unix_nano = 7; |
| 210 | // fixed64 end_time_unix_nano = 8; |
| 211 | // repeated opentelemetry.proto.common.v1.KeyValue attributes = 9; |
| 212 | // uint32 dropped_attributes_count = 10; |
| 213 | // repeated Event events = 11; |
| 214 | // uint32 dropped_events_count = 12; |
| 215 | // repeated Link links = 13; |
| 216 | // uint32 dropped_links_count = 14; |
| 217 | // Status status = 15; |
| 218 | // } |
| 219 | |
| 220 | // enum SpanKind { |
| 221 | // SPAN_KIND_UNSPECIFIED = 0; |
| 222 | // SPAN_KIND_INTERNAL = 1; |
| 223 | // SPAN_KIND_SERVER = 2; |
| 224 | // SPAN_KIND_CLIENT = 3; |
| 225 | // SPAN_KIND_PRODUCER = 4; |
| 226 | // SPAN_KIND_CONSUMER = 5; |
| 227 | // } |
| 228 | |
| 229 | // message Event { |
| 230 | // fixed64 time_unix_nano = 1; |
| 231 | // string name = 2; |
| 232 | // repeated opentelemetry.proto.common.v1.KeyValue attributes = 3; |
| 233 | // uint32 dropped_attributes_count = 4; |
| 234 | // } |
| 235 | |
| 236 | // message Link { |
| 237 | // bytes trace_id = 1; |
| 238 | // bytes span_id = 2; |
| 239 | // string trace_state = 3; |
| 240 | // repeated opentelemetry.proto.common.v1.KeyValue attributes = 4; |
| 241 | // uint32 dropped_attributes_count = 5; |
| 242 | // fixed32 flags = 6; |
| 243 | // } |
| 244 | |
| 245 | // |
| 246 | // |
| 247 | |
| 248 | const WireType = enum { |
| 249 | varint, |
| 250 | i64, |
| 251 | len, |
| 252 | sgroup, |
| 253 | egroup, |
| 254 | i32, |
| 255 | }; |
| 256 | |
| 257 | fn write_tag(w: anytype, nr: u64, ty: WireType) !void { |
| 258 | var _nr = nr; |
| 259 | _nr <<= 3; |
| 260 | _nr |= @intFromEnum(ty); |
| 261 | return write_varint(w, _nr); |
| 262 | } |
| 263 | |
| 264 | fn write_varint(w: anytype, x: u64) !void { |
| 265 | var _x = x; |
| 266 | inline for (0..10) |i| { |
| 267 | if (x < std.math.powi(u64, 2, 7 * (i + 1)) catch unreachable) { |
| 268 | var b: [i + 1]u8 = @splat(0); |
| 269 | for (b[0..i]) |*n| { |
| 270 | n.* |= 128; |
| 271 | } |
| 272 | for (0..b.len) |j| { |
| 273 | b[j] |= @intCast(_x & 127); |
| 274 | _x >>= 7; |
| 275 | } |
| 276 | std.debug.assert(_x == 0); |
| 277 | try w.writeAll(&b); |
| 278 | return; |
| 279 | } |
| 280 | } |
| 281 | unreachable; |
| 282 | } |
| 283 | |
| 284 | fn writef_bytes(w: anytype, nr: u64, bs: []const u8) !void { |
| 285 | try write_tag(w, nr, .len); |
| 286 | try write_varint(w, bs.len); |
| 287 | try w.writeAll(bs); |
| 288 | } |
| 289 | |
| 290 | fn writef_string(w: anytype, nr: u64, bs: []const u8) !void { |
| 291 | try write_tag(w, nr, .len); |
| 292 | try write_varint(w, bs.len); |
| 293 | try w.writeAll(bs); |
| 294 | } |
| 295 | |
| 296 | fn writef_varint(w: anytype, nr: u64, i: u64) !void { |
| 297 | try write_tag(w, nr, .varint); |
| 298 | try write_varint(w, i); |
| 299 | } |
Meghan Denny <hello@nektro.net> 2026-05-01 16:01:08 -07:00
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