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|
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 for {}", .{res.address});
} else |err| {
std.log.err("Error handling request for {} : {}", .{ 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;
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, res.request.target, '/');
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 T = struct {
const TestCtx = struct {};
const TestErr = error{ TestError, OutOfMemory };
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/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
}
}
};
test {
_ = T;
}
|
