Initial commit

server.odin

@@ -0,0 +1,220 @@
+package fjord
+
+import "core:bufio"
+import "core:bytes"
+import "core:io"
+import "core:log"
+import "core:net"
+import "core:path/slashpath"
+import "core:strconv"
+import "core:strings"
+import "core:unicode"
+
+import http "http"
+
+Server :: struct($Error_Type: typeid) {
+    endpoint:          net.Endpoint,
+    router:            Router(EndpointHandler(Error_Type)),
+    not_found_handler: #type proc(
+        request: ^http.Request,
+    ) -> (
+        http.Response,
+        Error_Type,
+    ),
+}
+
+@(private)
+request_ended :: proc(buf: []byte) -> bool {
+    HTTP_END_SEQUENCE :: []byte{'\r', '\n', '\r', '\n'}
+    return bytes.index(buf, HTTP_END_SEQUENCE) != -1
+}
+
+read_connection :: proc(
+    client_socket: net.TCP_Socket,
+    allocator := context.temp_allocator,
+) -> (
+    data: []byte,
+    err: http.RequestError,
+) {
+    TCP_CHUNK_SIZE :: 1024
+    buffer: bytes.Buffer
+    bytes.buffer_init_allocator(&buffer, 0, 0, allocator)
+
+    chunk: [TCP_CHUNK_SIZE]byte
+    for {
+        bytes_read, net_err := net.recv_tcp(client_socket, chunk[:])
+        if net_err != nil do return data, .NetworkError
+
+        if bytes_read == 0 do break
+        bytes.buffer_write(&buffer, chunk[:bytes_read])
+
+        if request_ended(buffer.buf[:]) do break
+    }
+
+    return buffer.buf[:], nil
+}
+
+server_init :: proc(
+    server: ^Server($Error_Type),
+    endpoint: net.Endpoint,
+    allocator := context.allocator,
+) {
+    server^ = Server(Error_Type) {
+        endpoint = endpoint,
+        not_found_handler = proc(
+            request: ^http.Request,
+        ) -> (
+            http.Response,
+            Error_Type,
+        ) {
+            body := "<div>Not found</div>"
+            http_response := http.make_response(
+                .NotFound,
+                transmute([]byte)body,
+                .Html,
+            )
+            return http_response, nil
+        },
+    }
+
+    router_init(&server.router)
+}
+
+server_destroy :: proc(server: ^Server($Error_Type)) {
+    router_destroy(&server.router)
+}
+
+server_add_handler :: proc(
+    server: ^Server($Error_Type),
+    method: http.Method,
+    path: []string,
+    handle_proc: #type proc(
+        request: ^http.Request,
+    ) -> (
+        http.Response,
+        Error_Type,
+    ),
+) {
+    path_variables := make([dynamic]string, context.allocator)
+    defer delete(path_variables)
+
+    for seg in path {
+        is_path_var :=
+            strings.has_prefix(seg, "{") && strings.has_suffix(seg, "}")
+
+        if is_path_var {
+            append(&path_variables, seg[1:len(seg) - 1])
+        }
+    }
+
+    joined_path := slashpath.join(path, context.allocator)
+    defer delete(joined_path)
+
+    if joined_path == "" {
+        router_add_route(
+            &server.router,
+            "/",
+            EndpointHandler(Error_Type){method},
+        )
+        server.handlers["/"] = EndpointHandler(Error_Type) {
+            method,
+            handle_proc,
+            path_variables[:],
+        }
+    } else {
+        server.handlers[joined_path] = Handler(Error_Type) {
+            method,
+            handle_proc,
+            path_variables[:],
+        }
+    }
+}
+
+// This is used instead of server_make param until compiler bug is fixed: https://github.com/odin-lang/Odin/issues/5792
+server_set_not_found_handler :: proc(
+    server: ^Server($Error_Type),
+    not_found_handler: #type proc(
+        request: ^http.Request,
+    ) -> (
+        http.Response,
+        Error_Type,
+    ),
+) {
+    server.not_found_handler = not_found_handler
+}
+
+match_handler_pattern :: proc(
+    server: ^Server($Error_Type),
+    method: http.Method,
+    path: string,
+    allocator := context.allocator,
+) -> (
+    handler: #type proc(request: ^http.Request) -> (http.Response, Error_Type),
+    path_variables: map[string]string,
+) {
+    path_variables = make(map[string]string, allocator)
+    segments := strings.split(path, "/", context.allocator)
+    defer delete(segments)
+
+    handler = server.handlers[identifier].procedure
+
+    return handler, path_variables
+}
+
+listen_and_serve :: proc(server: ^Server($Error_Type)) {
+    server_socket, net_err := net.listen_tcp(server.endpoint)
+    log.assert(net_err == nil, "Couldn't create TCP socket")
+    defer net.close(server_socket)
+
+    for {
+        client_socket, source, net_err := net.accept_tcp(server_socket)
+        if net_err != nil {
+            log.warnf("Failed to accept TCP connection, reason: %s", net_err)
+            continue
+        }
+        defer net.close(client_socket)
+
+        data, read_err := read_connection(
+            client_socket,
+            context.temp_allocator,
+        )
+        if read_err != nil {
+            log.warnf("Failed to read request, reason: %s", read_err)
+            continue
+        }
+
+        http_request, unmarshall_err := http.unmarshall_request(
+            data,
+            context.temp_allocator,
+        )
+        if unmarshall_err != nil {
+            log.warnf(
+                "Failed to unmarshall request, reason: %s",
+                unmarshall_err,
+            )
+            continue
+        }
+
+        handler: #type proc(
+            request: ^http.Request,
+        ) -> (
+            http.Response,
+            Error_Type,
+        )
+        handler, http_request.path_variables = match_handler_pattern(
+            server,
+            http_request.method,
+            http_request.path,
+        )
+
+        http_response, err := handler(&http_request)
+
+        marshalled_response := http.marshall_response(
+            &http_response,
+            context.temp_allocator,
+        )
+        net.send_tcp(client_socket, marshalled_response)
+
+        free_all(context.temp_allocator)
+    }
+}