1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
|
const std = @import("std");
/// Wrapper around a std.http.Server to run a multi-threaded HTTP server using thread-per-request and arena-per-request
/// Context is .clone()'d and passed to each request, useful for passing user data to each request handler e.g. a database connection.
/// HandlerType provides a single method handle() which is used to actually handle requests.
pub fn Server(comptime Context: type, comptime Handler: type) type {
return struct {
address: std.net.Address,
context: Context,
handler: Handler,
max_header_size: usize = 8192,
n_threads: u32 = 50,
allocator: std.mem.Allocator,
pub fn serve(self: @This()) !void {
var tp = std.Thread.Pool{ .threads = &[_]std.Thread{}, .allocator = self.allocator };
try tp.init(.{ .allocator = self.allocator, .n_jobs = self.n_threads });
defer tp.deinit();
var svr_internal = std.http.Server.init(self.allocator, .{ .reuse_address = true });
defer svr_internal.deinit();
try svr_internal.listen(self.address);
std.log.info("server listening on {}", .{self.address});
while (true) {
var aa = std.heap.ArenaAllocator.init(self.allocator); // will be freed by the spawned thread.
var conn = try svr_internal.accept(.{ .allocator = aa.allocator(), .header_strategy = .{ .dynamic = self.max_header_size } });
const ctx: Context = self.context.clone();
try tp.spawn(handle, .{ self, &conn, ctx, aa });
}
}
fn handle(self: @This(), res: *std.http.Server.Response, ctx: Context, aa: std.heap.ArenaAllocator) void {
defer aa.deinit();
defer ctx.deinit();
defer res.deinit();
if (res.wait()) {
if (self.handler.handle(res, ctx)) {
std.log.info("Success handling request [{s} {s} {s}] status {d} client {}", .{ @tagName(res.request.method), res.request.target, @tagName(res.request.version), @intFromEnum(res.status), res.address });
} else |err| {
std.log.info("Error handling request [{s} {s} {s}] client {} error {}", .{ @tagName(res.request.method), res.request.target, @tagName(res.request.version), res.address, err });
if (handle_simple_response(res, "<html><body>Server error!</body></html>", .internal_server_error)) {} else |err2| {
std.log.err("Error sending error page for {} : {}", .{ res.address, err2 });
}
}
} else |_| {
// Do nothing
}
if (res.state != .finished) {
std.log.err("request wasn't finished!", .{});
}
}
fn handle_simple_response(res: *std.http.Server.Response, content: []const u8, status: std.http.Status) !void {
res.status = status;
res.transfer_encoding = .{ .content_length = content.len };
try res.headers.append("content-type", "text/html");
try res.do();
try res.writer().writeAll(content);
try res.finish();
}
};
}
const Response = std.http.Server.Response;
pub const Params = std.StringHashMap([]const u8);
/// Routing component for an http server with wildcard matching and parameter
/// Handles matching a request to a handler.
/// Handler pattern can either be matched exactly
/// or it can have matcher segments, so
/// "/" -> matches request for "/" only
/// "/foo" matches request for "/foo" only
/// "/foo/{bar}/baz" matches request for "/foo/123/baz" and "/foo/bar/baz", and Params would contain "bar":"123" and "bar":"bar" respectively.
/// or it can have terminating wildcards, so
/// "/foo/*" -> matches "/foo", "/foo/bar","/foo/bar/baz"
/// "/*" -> matches all requests
/// TODO something clever to parse path parameters into the appropriate types, maybe smth like "/foo/{bar:u32}/baz"
/// TODO something to handle query parameters and request body too
pub fn Router(comptime Context: type, comptime ErrorType: type) type {
return struct {
pub const Handler = struct {
method: std.http.Method,
pattern: []const u8,
handle_fn: *const fn (res: *Response, ctx: Context, Params) ErrorType!void,
};
handlers: []const Handler,
notfound: *const fn (res: *Response, ctx: Context) ErrorType!void,
pub fn handle(self: @This(), res: *Response, ctx: Context) ErrorType!void {
// Routing can only happen after we have the headers
// It is a programmer error to call this without calling .wait first.
if (res.state != .waited) unreachable;
const p = try Path.parse(res.request.target);
const path = p.path;
handler_loop: for (self.handlers) |handler| {
if (handler.method != res.request.method) {
continue :handler_loop;
}
var path_params: Params = std.StringHashMap([]const u8).init(res.allocator);
defer path_params.deinit();
var handle_split = std.mem.splitScalar(u8, handler.pattern, '/');
var req_split = std.mem.splitScalar(u8, path, '/');
while (true) {
const maybe_handle_seg = handle_split.next();
const maybe_req_seg = req_split.next();
if (maybe_handle_seg == null and maybe_req_seg == null) {
// End of both handler and request, they matched this far so
// the handler must handle.
try handler.handle_fn(res, ctx, path_params);
break :handler_loop;
} else if (maybe_handle_seg != null and std.mem.eql(u8, maybe_handle_seg.?, "*")) {
// Wildcard, this matches
try handler.handle_fn(res, ctx, path_params);
break :handler_loop;
} else if (maybe_handle_seg == null or maybe_req_seg == null) {
// path lengths don't match, try the next handler
continue :handler_loop;
} else {
const handle_seg = maybe_handle_seg.?;
const req_seg = maybe_req_seg.?;
if (handle_seg.len > 0 and handle_seg[0] == '{' and handle_seg[handle_seg.len - 1] == '}') {
// Capture and keep going
const key = handle_seg[1 .. handle_seg.len - 1];
try path_params.put(key, req_seg);
} else if (std.mem.eql(u8, handle_seg, req_seg)) {
// segments match, keep going
} else {
// mismatch, try the next handler
continue :handler_loop;
}
}
}
} else {
try self.notfound(res, ctx);
}
}
};
}
const RouterTest = struct {
const TestCtx = struct {};
const TestErr = error{ TestError, OutOfMemory } || Path.ParseError;
const TestRouter = Router(TestCtx, TestErr);
var notfoundinvoked = false;
fn notfound(_: *Response, _: TestCtx) TestErr!void {
notfoundinvoked = true;
}
var route1invoked = false;
var route1params: ?Params = null;
fn route1(_: *Response, _: TestCtx, p: Params) TestErr!void {
route1invoked = true;
route1params = try p.clone();
}
var route2invoked = false;
fn route2(_: *Response, _: TestCtx, _: Params) TestErr!void {
route2invoked = true;
}
fn reset() void {
notfoundinvoked = false;
if (route1params != null) route1params.?.deinit();
route1params = null;
route1invoked = false;
route2invoked = false;
}
fn runTestRouter(handlers: []TestRouter.Handler, target: []const u8) !void {
const alloc = std.testing.allocator;
const ctx = TestCtx{};
var buf: [128]u8 = undefined;
const req = std.http.Server.Request{
.method = .GET,
.target = target,
.version = .@"HTTP/1.1",
.headers = std.http.Headers.init(alloc),
.parser = std.http.protocol.HeadersParser.initStatic(&buf),
};
const sock = try std.net.tcpConnectToAddress(std.net.Address{ .in = std.net.Ip4Address.init(.{ 127, 0, 0, 1 }, 22) });
defer sock.close();
const conn = std.http.Server.Connection{
.stream = sock,
.protocol = .plain,
};
var res = Response{
.allocator = alloc,
.address = std.net.Address{ .in = std.net.Ip4Address.init(.{ 127, 0, 0, 1 }, 8080) },
.connection = conn,
.headers = std.http.Headers.init(alloc),
.request = req,
.state = .waited,
};
const router = TestRouter{
.handlers = handlers,
.notfound = notfound,
};
try router.handle(&res, ctx);
}
// fn hmof(x: []const u8, y: []const u8) std.StringHashMap([]const u8) {
// var hm = std.StringHashMap([]const u8).init(std.testing.allocator);
// hm.put(x, y) catch @panic("failed to create hmof in test");
// return hm;
// }
const TestCase = struct {
target: []const u8,
route1: ?[]const u8 = null,
route2: ?[]const u8 = null,
notfoundexpected: bool = false,
route1expected: bool = false,
route2expected: bool = false,
// route1paramsexpected: ?Params = null,
};
fn expectEqual(maybe_pexp: ?Params, maybe_pact: ?Params) !void {
if (maybe_pexp == null and maybe_pact == null) {
// fine
} else if (maybe_pexp == null or maybe_pact == null) {
std.debug.print("isnull(pexp) = {} isnull(pact) = {}", .{ maybe_pexp == null, maybe_pact == null });
return error.TestUnexpectedResult;
} else {
const pexp = maybe_pexp.?;
const pact = maybe_pact.?;
try std.testing.expectEqual(pexp.count(), pact.count());
var it = pexp.keyIterator();
var kexp = it.next();
while (kexp != null) : (kexp = it.next()) {
var vexp = pexp.get(kexp.?.*).?;
var maybe_vact = pact.get(kexp.?.*);
if (maybe_vact) |vact| {
std.debug.print("{s} {s}", .{ vexp, vact });
try std.testing.expectEqual(vexp, vact);
} else {
std.debug.print("expected key {s} not found in actual", .{kexp.?.*});
return error.TestUnexpectedResult;
}
}
}
}
test "router tests" {
// var m0 = std.StringHashMap([]const u8).init(std.testing.allocator);
// defer m0.deinit();
// var m1 = hmof("var", "bam");
// defer m1.deinit();
const cases = [_]TestCase{
.{
.target = "/",
.notfoundexpected = true,
},
.{
.target = "/",
.route1 = "/",
.route1expected = true,
// .route1paramsexpected = m0,
},
.{
.target = "/foo",
.route1 = "/bar",
.notfoundexpected = true,
},
.{
.target = "/bar",
.route1 = "/foo",
.route2 = "/bar",
.route2expected = true,
},
.{
.target = "/baz",
.route1 = "/",
.notfoundexpected = true,
},
.{
.target = "/baz",
.route1 = "/*",
.route2 = "/bar",
.route1expected = true,
// .route1paramsexpected = m0,
},
.{
.target = "/baz",
.route1 = "/*",
.route2 = "/baz",
.route1expected = true, // first matching route takes prio
// .route1paramsexpected = m0,
},
.{
.target = "/baz",
.route1 = "/baz",
.route2 = "/*",
.route1expected = true, // first matching route takes prio
// .route1paramsexpected = m0,
},
.{
.target = "/baz/bam",
.route1 = "/baz/{var}",
.route1expected = true,
// .route1paramsexpected = m1,
},
.{
.target = "/baz/bam/boo",
.route1 = "/baz/{var}/boo",
.route1expected = true,
// .route1paramsexpected = m1,
},
.{
.target = "/baz/bam/boo?somequery=foo",
.route1 = "/baz/{var}/boo",
.route1expected = true,
// .route1paramsexpected = m1,
},
// .{
// .target = "/baz/bam/bar",
// .route1 = "/baz/{var}/boo",
// .notfoundexpected = true,
// },
};
for (cases) |case| {
defer reset();
var handlers = std.ArrayList(TestRouter.Handler).init(std.testing.allocator);
defer handlers.deinit();
if (case.route1) |r1| {
try handlers.append(TestRouter.Handler{ .pattern = r1, .method = .GET, .handle_fn = route1 });
}
if (case.route2) |r2| {
try handlers.append(TestRouter.Handler{ .pattern = r2, .method = .GET, .handle_fn = route2 });
}
try runTestRouter(handlers.items, case.target);
try std.testing.expectEqual(case.notfoundexpected, notfoundinvoked);
try std.testing.expectEqual(case.route1expected, route1invoked);
try std.testing.expectEqual(case.route2expected, route2invoked);
// try expectEqual(case.route1paramsexpected, route1params); // TODO assert captures
}
}
};
/// HTTP path parsing
/// which is a subset of URI parsing :)
pub const Path = struct {
path: []const u8,
query: []const u8,
fragment: []const u8, // technically I think the fragment is never received on the server anyway
pub const ParseError = error{Malformatted};
pub fn parse(path: []const u8) ParseError!Path {
var p = Path{
.path = path,
.query = "",
.fragment = "",
};
const q_ix = std.mem.indexOfScalar(u8, path, '?');
const f_ix = std.mem.indexOfScalar(u8, path, '#');
if (q_ix) |q| {
p.path = path[0..q];
if (f_ix) |f| {
if (f < q) {
return ParseError.Malformatted;
}
p.query = path[(q + 1)..f];
p.fragment = path[(f + 1)..];
} else {
p.query = path[(q + 1)..];
}
} else if (f_ix) |f| {
p.path = path[0..f];
p.fragment = path[(f + 1)..];
}
return p;
}
pub fn get_query_param(self: Path, key: []const u8) ?[]const u8 {
var it1 = std.mem.splitScalar(u8, self.query, '&');
var t: ?[]const u8 = it1.first();
while (t != null) : (t = it1.next()) {
var it2 = std.mem.splitScalar(u8, t.?, '=');
const k = it2.first();
const v = it2.next();
if (std.mem.eql(u8, key, k)) {
return v;
}
}
return null;
}
};
const PathTest = struct {
test "path" {
const p = try Path.parse("/");
try std.testing.expectEqualDeep(Path{ .path = "/", .query = "", .fragment = "" }, p);
}
test "query" {
const p = try Path.parse("/foo?bar=baz");
try std.testing.expectEqualDeep(Path{ .path = "/foo", .query = "bar=baz", .fragment = "" }, p);
}
test "query and fragment" {
const p = try Path.parse("/foo?bar=baz#frag");
try std.testing.expectEqualDeep(Path{ .path = "/foo", .query = "bar=baz", .fragment = "frag" }, p);
}
test "fragment" {
const p = try Path.parse("/foo#frag");
try std.testing.expectEqualDeep(Path{ .path = "/foo", .query = "", .fragment = "frag" }, p);
}
test "query param" {
const p = try Path.parse("/foo?bar=baz#frag");
const v1 = p.get_query_param("bar");
try std.testing.expect(v1 != null);
try std.testing.expectEqualSlices(u8, "baz", v1.?);
const v2 = p.get_query_param("bam");
try std.testing.expect(v2 == null);
}
};
test {
_ = RouterTest;
_ = PathTest;
}
|
