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Embedded Web Server

Introduction

EWS is a web server construction kit, designed for embedded applications using the GNAT Ada compiler.

The project is hosted on Github.

Building with Alire

See the Alire documentation.

After you've installed Alire, start a small test program by saying

alr init --bin ews_test
cd ews_test
alr with ews

This generates a project (GPR) file at the top level and a source file src/ews_test.adb.

Create a directory html and in it index.html containing (for example)

<html>
<body>
<font color="red">Hello world!</font>
</body>
</html>

The contents of html/ need to be converted to Ada source code in src/, which will form the static content of the pages served by ews_test. This can be done as part of the Alire build process; to do this, edit alire.toml to add the lines

[[actions]]
type = "pre-build"
command = ["ews_generator", "--input-dir", "html", "--output-dir", "src"]

Edit the contents of src/ews_test.adb to contain

with EWS_Htdocs;
with EWS.Server;
procedure EWS_Test is
begin
   EWS.Server.Serve (Using_Port => 8088,
                     Tracing    => True);
end EWS_Test;

and build and run with

alr run

Now, in your browser, open localhost:8088 (possibly, 127.0.0.1:8088) to see your exciting web page!

To see a worked example of dynamic content, check out the document ews.pdf.

Building outside Alire

EWS requires GNAT and XML/Ada, and uses Ada 2012 features.

In the top-level directory, make will build the library, and make demo will create a server doc/ews_demo, which when executed will listen on port 8080 and respond with the web in the doc/ directory.

The package can be installed with the compiler by make install (more likely, sudo make install). You can install in an alternative place by setting prefix, for example

$ make install prefix=~/local/ews

Dynamic web

The facilities available in EWS, and the code for a demonstration, are described in demonstrator/ews.pdf, which is derived from demonstrator/ews.w. As well as being the document source, ews.w also acts as the source code using the Literate Programming facilities of nuweb.py.

Demonstration

If you're seeing this page via the demonstration (ews_demo), you can view a page with AJAX content here.