WAYUU

WAYUU is a blazing fast, lightweight web server and a microframework for building web applications and services.

Usage

There are two ways of using WAYUU: standalone and embedded configuration.

Standalone usage allows WAYUU to serve static content. If you are interested in building applications that use the REST API support that is native in WAYUU, you should embed WAYUU in your application.

Standalone usage

Simply compile the binary and execute it. As standard, you can get a list of CLI options using the -h flag.

$ ./wayuu -h
USAGE: wayuu [-d] [-b ip_addr] [-p port] [-r root] [-f]
Options:
-d         : Enabled DEBUG mode
-b ip_addr : Bind to IP address. Default: "0.0.0.0"
-p port    : Bind to TCP port. Default: 4443
-r root    : Use root as the root folder for WAYUU. Default: /etc/wayuu
-f         : HTTP mode

Embedded usage

Include the header file wayuu.h in your project.

The WAYUU Makefile includes a lib target that compiles WAYUU as a static library.

Routing

WAYUU implements a very simple routing framework that supports most use cases in a RESTful API implementation. For more details you can refer to the implementation in router.h and router.c.

A Route is defined by 3 elements:

1. The URL specification of the route, in the form METHOD:PATH, where METHOD is an HTTP Method. Currently the API supports: GET, POST, DELETE. PATH is the fragment of the URL that will be matched. WAYUU serves all Router requests from the /api endpoint. For instance, the URL specification GET:/users will match the HTTP request GET /api/users.

2. The Request Handler, which is an implementation of the pointer to function void (*request_handler)(api_request *req). This is where the request is properly handled and the response generated and returned. The structure api_request is specified in http_utils.h. It contains the context of the HTTP request. Implementations can use the utility functions in http_utils.h to return standard answers.

3. The Request Filter, an optional mechanism that can be used to implement features such as enpoint authentication, security and logging functionality. The request filter is an implementation of the function pointer bool (*request_filter)(api_request *req) as specified in router.h. If provided, the Router will execute the filter function before the request handler. If the filter function returns true, the request handler is executed. Otherwise, the request handler is not executed. The filter function must implement appropriate return in case of exception.

The Route can be added to the Router using the function void router_add_route(char *matcher, request_handler handler, request_filter filter);

Serve static content

WAYUU will serve static content from WAYUU_ROOT/www, where WAYUU_ROOT is the root folder for WAYUU. Default folder for static files: /etc/wayuu/www.

IP Filtering

WAYUU can be configured to serve only requests from certain IP addresses. The folder WAYUU_ROOT/etc can contain an allow file and a deny file. The allow file contains a list of IP addresses that will be whitelisted. The deny file contains a list of IP addressed that will be blacklisted. The format of these files is a very simple list of IP addresses, one per line.

SSL Configuration

The SSL certificates must be placed under the ssl folder. By default: /etc/wayuu/ssl. WAYUU looks for a cert.pem and a key.pem file.

Resource Limits

WAYUU can manage the resource limits applied to URLs. This is done in the WAYUU_ROOT/etc/limits file.

The limits configuration file contains a list of comma delimited tuples: path, maximum connections, max connections per IP, max execution seconds

Example:

/api, 20, 2, 10

In this example, access to every path beginning with /api will be limited to a maximum of 20 simultaneous connections and no more than 2 from the same IP. Connections will be dropped if alive for more than 10 seconds

Building

WAYUU uses standard Linux GNU extensions as well as OpenSSL and libcrypto. You can use build WAYUU easily with GCC and Make.

• make: Builds the wayuu binary.
• sudo make install: Install wayuu shared libraries and headers.
• make test: Executes the unit tests.

Supported platforms

Tested on Ubuntu 18.04+, as well as Debian, and Fedora.

It should be relatively easy to port WAYUU it to other distribution or Operating Systems, given that WAYUU only uses a minimal set of standard dependencies.