X-Git-Url: https://gitweb.ps.run/chirp/blobdiff_plain/8ce4f0b76cab1963cd0a8ad55bf5b30b9eae917f..7d44a5163fd261dcb08282e15da9666e00a4f4b0:/src/http.zig?ds=sidebyside

diff --git a/src/http.zig b/src/http.zig
new file mode 100644
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--- /dev/null
+++ b/src/http.zig
@@ -0,0 +1,344 @@
+const std = @import("std");
+const posix = std.posix;
+const linux = std.os.linux;
+
+pub const Server = struct {
+    // TODO: factor out
+    const BACKLOG = 2048;
+
+    listener: posix.socket_t,
+    efd: i32,
+    ready_list: [BACKLOG]linux.epoll_event = undefined,
+
+    ready_count: usize = 0,
+    ready_index: usize = 0,
+
+    pub fn init(name: []const u8, port: u16) !Server {
+        const address = try std.net.Address.resolveIp(name, port);
+
+        const tpe: u32 = posix.SOCK.STREAM | posix.SOCK.NONBLOCK;
+        const protocol = posix.IPPROTO.TCP;
+        const listener = try posix.socket(address.any.family, tpe, protocol);
+
+        try posix.setsockopt(listener, posix.SOL.SOCKET, posix.SO.REUSEADDR, &std.mem.toBytes(@as(c_int, 1)));
+        try posix.bind(listener, &address.any, address.getOsSockLen());
+        try posix.listen(listener, BACKLOG);
+
+        // epoll_create1 takes flags. We aren't using any in these examples
+        const efd = try posix.epoll_create1(0);
+
+        var event = linux.epoll_event{ .events = linux.EPOLL.IN, .data = .{ .fd = listener } };
+        try posix.epoll_ctl(efd, linux.EPOLL.CTL_ADD, listener, &event);
+
+        return .{
+            .listener = listener,
+            .efd = efd,
+        };
+    }
+
+    pub fn deinit(self: Server) void {
+        posix.close(self.efd);
+        posix.close(self.listener);
+    }
+
+    pub fn wait(self: *Server) void {
+        if (self.ready_index >= self.ready_count) {
+            self.ready_index = 0;
+            self.ready_count = posix.epoll_wait(self.efd, &self.ready_list, -1);
+        }
+    }
+
+    pub fn next_request(self: *Server, buf: []u8) !?Request {
+        while (self.ready_index < self.ready_count) {
+            const ready = self.ready_list[self.ready_index];
+            const ready_socket = ready.data.fd;
+            self.ready_index += 1;
+
+            if (ready_socket == self.listener) {
+                const client_socket = try posix.accept(self.listener, null, null, posix.SOCK.NONBLOCK);
+                errdefer posix.close(client_socket);
+                var event = linux.epoll_event{ .events = linux.EPOLL.IN, .data = .{ .fd = client_socket } };
+                try posix.epoll_ctl(self.efd, linux.EPOLL.CTL_ADD, client_socket, &event);
+            } else {
+                var closed = false;
+                var req = Request{ .fd = ready_socket };
+
+                const read = posix.read(ready_socket, buf) catch 0;
+                if (read == 0) {
+                    closed = true;
+                } else {
+                    if (req.parse(buf[0..read]))
+                        return req;
+                }
+
+                if (closed or ready.events & linux.EPOLL.RDHUP == linux.EPOLL.RDHUP) {
+                    posix.close(ready_socket);
+                }
+            }
+        }
+        return null;
+    }
+};
+
+// pub const Method = enum { GET, POST };
+pub const Method = std.http.Method;
+
+// pub const Header = struct {
+//     const NAME_SIZE = 32;
+//     const VALUE_SIZE = 128;
+
+//     name: std.BoundedArray(u8, NAME_SIZE),
+//     value: std.BoundedArray(u8, VALUE_SIZE),
+// };
+pub const Header = struct {
+    const Name = std.BoundedArray(u8, 32);
+    const Value = std.BoundedArray(u8, 128);
+
+    name: Name = Name.init(0) catch unreachable,
+    value: Value = Value.init(0) catch unreachable,
+};
+pub const Status = std.http.Status;
+
+pub const Request = struct {
+    fd: posix.fd_t,
+
+    method: Method = undefined,
+    target: []const u8 = undefined,
+    version: ?[]const u8 = null,
+    head: ?[]const u8 = null,
+    body: ?[]const u8 = null,
+
+    pub fn parse(self: *Request, buf: []const u8) bool {
+        var state: u8 = 0;
+
+        var start: u32 = 0;
+        // var end: u32 = 0;
+
+        var index: u32 = 0;
+        while (index < buf.len) {
+            defer index += 1;
+
+            const c = buf[index];
+
+            switch (state) {
+                0 => {
+                    if (c == ' ') {
+                        self.method = @enumFromInt(Method.parse(buf[start..index]));
+                        start = index + 1;
+                        state += 1;
+                    }
+                },
+                1 => {
+                    if (c == ' ') {
+                        self.target = buf[start..index];
+                        start = index + 1;
+                        state += 1;
+                    }
+                },
+                2 => {
+                    if (c == '\r') {
+                        self.version = buf[start..index];
+                        start = index + 2;
+                        index += 1;
+                        state += 1;
+                    }
+                },
+                3 => {
+                    if (c == '\r' and (index + 2) < buf.len and buf[index + 2] == '\r') {
+                        self.head = buf[start..index];
+
+                        if (index + 4 < buf.len) {
+                            self.body = buf[index + 4 .. buf.len];
+                        }
+                        return true;
+                    }
+                },
+                else => {},
+            }
+        }
+
+        return true;
+    }
+
+    pub fn get_header(self: Request, name: []const u8) ?[]const u8 {
+        const head = self.head orelse return null;
+        var start: usize = 0;
+        var matching: usize = 0;
+        for (0..head.len) |i| {
+            const c = head[i];
+
+            if (matching < name.len) {
+                if (c == name[matching]) {
+                    if (matching == 0) start = i;
+                    matching += 1;
+                } else {
+                    matching = 0;
+                }
+            } else {
+                if (c == '\r') {
+                    return head[start..i];
+                }
+            }
+        }
+        return null;
+    }
+
+    pub fn get_cookie(self: Request, name: []const u8) ?[]const u8 {
+        const cookie = self.get_header("Cookie") orelse return null;
+        var start: usize = 0;
+        var matching: usize = 0;
+        for (0..cookie.len) |i| {
+            const c = cookie[i];
+
+            if (matching < name.len) {
+                if (c == name[matching]) {
+                    if (matching == 0) start = i;
+                    matching += 1;
+                } else {
+                    matching = 0;
+                }
+            } else {
+                if (c == '=') {
+                    if (std.mem.indexOfScalarPos(u8, cookie, i, ';')) |semi_index| {
+                        return cookie[i + 1 .. semi_index];
+                    } else {
+                        return cookie[i + 1 .. cookie.len];
+                    }
+                } else {
+                    matching = 0;
+                }
+            }
+        }
+        return null;
+    }
+
+    pub fn parse1(self: *Request, buf: []const u8) bool {
+        const method_start: usize = 0;
+        const method_end = std.mem.indexOfScalar(u8, buf, ' ') orelse return false;
+        self.method = @enumFromInt(Method.parse(buf[method_start..method_end]));
+
+        const target_start = method_end + 1;
+        const target_end = std.mem.indexOfScalarPos(u8, buf, target_start, ' ') orelse return false;
+        self.target = buf[target_start..target_end];
+
+        const version_start = target_end + 1;
+        const version_end = std.mem.indexOfPos(u8, buf, version_start, "\r\n") orelse buf.len;
+        self.version = buf[version_start..version_end];
+
+        if (version_end + 2 >= buf.len)
+            return true;
+        const head_start = version_end + 2;
+        const head_end = std.mem.indexOfPos(u8, buf, head_start, "\r\n\r\n") orelse buf.len;
+        self.head = buf[head_start..head_end];
+
+        if (head_end + 4 >= buf.len)
+            return true;
+        const body_start = head_end + 4;
+        const body_end = buf.len;
+        self.body = buf[body_start..body_end];
+
+        return true;
+    }
+
+    pub fn get_header1(self: Request, name: []const u8) ?[]const u8 {
+        const head = self.head orelse return null;
+        const header_start = std.mem.indexOf(u8, head, name) orelse return null;
+        const header_end = std.mem.indexOfPos(u8, head, header_start, "\r\n") orelse return null;
+        return head[header_start..header_end];
+    }
+
+    pub fn get_cookie1(self: Request, name: []const u8) ?[]const u8 {
+        const cookie = self.get_header("Cookie") orelse return null;
+        const name_index = std.mem.indexOf(u8, cookie, name) orelse return null;
+        const eql_index = std.mem.indexOfScalarPos(u8, cookie, name_index, '=') orelse return null;
+        if (std.mem.indexOfScalarPos(u8, cookie, eql_index, ';')) |semi_index| {
+            return cookie[eql_index + 1 .. semi_index];
+        } else {
+            return cookie[eql_index + 1 .. cookie.len];
+        }
+    }
+
+    pub fn get_value(self: Request, name: []const u8) ?[]const u8 {
+        const body = self.body orelse return null;
+        const name_index = std.mem.indexOf(u8, body, name) orelse return null;
+        const eql_index = std.mem.indexOfScalarPos(u8, body, name_index, '=') orelse return null;
+        if (std.mem.indexOfScalarPos(u8, body, name_index, '&')) |amp_index| {
+            return body[eql_index + 1 .. amp_index];
+        } else {
+            return body[eql_index + 1 .. body.len];
+        }
+    }
+};
+
+pub const Response = struct {
+    const ExtraHeadersMax = 16;
+    const HeaderList = std.BoundedArray(Header, ExtraHeadersMax);
+
+    fd: posix.fd_t,
+    stream_head: std.io.FixedBufferStream([]u8),
+    stream_body: std.io.FixedBufferStream([]u8),
+    status: Status = .ok,
+    extra_headers: HeaderList = HeaderList.init(0) catch unreachable,
+
+    pub fn init(fd: posix.fd_t, buf_head: []u8, buf_body: []u8) Response {
+        return .{
+            .fd = fd,
+            .stream_head = std.io.fixedBufferStream(buf_head),
+            .stream_body = std.io.fixedBufferStream(buf_body),
+        };
+    }
+
+    pub fn redirect(self: *Response, location: []const u8) !void {
+        self.status = .see_other;
+        try self.add_header("Location", .{ "{s}", .{location} });
+    }
+
+    pub fn add_header(self: *Response, name: []const u8, value: anytype) !void {
+        const header = try self.extra_headers.addOne();
+        try header.name.writer().writeAll(name);
+        if (@typeInfo(@TypeOf(value)).Struct.fields.len < 2 or @sizeOf(@TypeOf(value[1])) == 0) {
+            try header.value.writer().writeAll(value[0]);
+        } else {
+            try std.fmt.format(header.value.writer(), value[0], value[1]);
+        }
+    }
+
+    pub fn write(self: *Response, comptime fmt: []const u8, args: anytype) !void {
+        const writer = self.stream_body.writer();
+
+        if (@sizeOf(@TypeOf(args)) == 0) {
+            try writer.writeAll(fmt);
+        } else {
+            try std.fmt.format(writer, fmt, args);
+        }
+    }
+
+    pub fn send(self: *Response) !void {
+        // write head
+        const writer = self.stream_head.writer();
+
+        try std.fmt.format(writer, "HTTP/1.1 {} {?s}\r\n" ++
+            "Content-Length: {}\r\n", .{ @intFromEnum(self.status), self.status.phrase(), self.stream_body.pos });
+
+        for (self.extra_headers.constSlice()) |header| {
+            try std.fmt.format(writer, "{s}: {s}\r\n", .{ header.name.constSlice(), header.value.constSlice() });
+        }
+
+        try std.fmt.format(writer, "\r\n", .{});
+
+        // write body to head
+
+        try std.fmt.format(writer, "{s}", .{self.stream_body.getWritten()});
+
+        // send head
+
+        const res = self.stream_head.getWritten();
+        var written: usize = 0;
+        while (written < res.len) {
+            written += posix.write(self.fd, res[written..res.len]) catch |err| {
+                std.debug.print("posix.write: {}\n", .{err});
+                continue;
+            };
+        }
+    }
+};