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httpserver.winxed
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httpserver.winxed
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#! winxed
/***********************************************************************
=head1 NAME
httpserver.winxed
=head1 AUTHOR
(C) 2010-2011 Julian Albo
=head1 DESCRIPTION
Winxed http server, to be used as a module or from command line.
Example of usage as module in a PIR program.
.sub 'handler_hello'
.param pmc request
request.'contentType'('text/html')
request.'print'( <<'END' )
<html>
<body>
<h1>Hello from PIR!</h1>
<p><a href="other.html">Other</a></p>
</body>
</html>
END
.end
.sub 'handler_other'
.param pmc request
request.'contentType'('text/html')
request.'print'( <<'END' )
<html>
<body>
<h1>This is also PIR!</h1>
<p><a href="/">Return</a></p>
</body>
</html>
END
.end
.sub main :main
load_bytecode 'httpserver.pbc'
.local pmc host
host = new 'Hash'
host['name'] = 'localhost'
host['port'] = 8080
.local pmc config
config = new 'Hash'
config['host'] = host
.local pmc server
.local pmc createServer
createServer = get_root_global ['parrot';'HTTP'], 'createServer'
server = createServer(config)
.const 'Sub' hello = 'handler_hello'
.const 'Sub' other = 'handler_other'
server.'handle'('/', hello)
server.'handle'('/other.html', other)
server.'serve'()
.end
=cut
***********************************************************************/
// Sets DEBUG to 1 to to emit debug info.
// When set to 0, if (DEBUG) statements are optimized out.
const int DEBUG = 0;
$include_const "socket.pasm";
const string CR = "\r";
const string LF = "\n";
/***********************************************************************
=head1 Auxiliary functions
=over
=item Trace
Print a line on stderr.
=cut
*/
function Trace(msgs [slurpy])
{
var stderr = getstderr();
for (var msg in msgs)
stderr.print(msg);
stderr.print("\n");
}
function warn(string msg)
{
var stderr = getstderr();
stderr.print("WARNING: ");
stderr.print(msg);
stderr.print("\n");
}
//**********************************************************************
function getPage(string line)
{
int p = indexof(line, ' ');
if (p < 0)
return '';
string method = substr(line, 0, p);
line = substr(line, p + 1);
p = indexof(line, ' ');
if (p < 0)
return '';
string page = substr(line, 0, p);
return page;
}
function getHeader(string buf)
{
var header = {};
string line = '';
string prev = '';
int method = 0;
string page = '';
for (string ch in buf) {
// Accept lines ending with CR, LF, or CRLF.
if (ch == CR || (ch == LF && prev != CR)) {
if (method == 0) {
page = getPage(line);
method = 1;
}
line = '';
}
else
line = line + ch;
prev = ch;
}
header['page'] = page;
return header;
}
function errorNotFound(var request)
{
var server = request.getServer();
int numrequests = server.numRequests();
string host = server.getHost();
request.contentType('text/html');
request.status(404);
request.print(
"<html>\n" +
"<body>\n" +
"<h1>Page Not Found</h1>\n" +
"<p>\n" +
"The requested URL was not found\r\n" +
"</p>\n" +
"</body>\n" +
"</html>\n"
);
}
function statusPage(var request)
{
var server = request.getServer();
int numrequests = server.numRequests();
string host = server.getHost();
request.contentType('text/html');
request.print(
"<html>\n" +
"<body>\n" +
"<h1>\n" +
"Server status\n" +
"</h1>\n" +
"<p>\n" +
"Pages served: " + string(numrequests) +
"</p>\n" +
"</body>\n" +
"</html>\n"
);
}
function helloPage(request)
{
request.contentType('text/html');
string response =
"<html>\n" +
"<body>\n" +
"<h1>\n" +
"Hola, mundo\n" +
"</h1>\n" +
"</body>\n" +
"</html>\n";
request.print(response);
}
/*
=back
=cut
*/
namespace HTTP {
/***********************************************************************
=head1 class HTTP;Request
Not documented yet.
=cut
*/
class Request
{
var server;
var conn;
var st;
var contype;
var header_sent;
function Request(server, conn)
{
self.server = server;
self.conn = conn;
self.st = 200;
self.contype = '';
self.header_sent = 0;
}
function getServer()
{
return self.server;
}
function status(int newst)
{
self.st = newst;
}
function contentType(string type)
{
self.contype = type;
}
function send_header()
{
string type = self.contype;
if (type == '')
type = 'text/plain';
string host = self.server.getHost();
string status = self.st;
string stext;
switch (status) {
case 200: stext = 'OK'; break;
case 404: stext = 'NotFound'; break;
default: stext = 'unknown'; break;
}
self.conn.send(
"HTTP/1.1 " + status + " " + stext + "\r\n" +
"Server: " + host + "\r\n" +
"Connection: Close\r\n" +
"Content-type: " + type + "\r\n" +
"\r\n"
);
self.header_sent = 1;
}
function print(string str)
{
if (! self.header_sent)
self.send_header();
self.conn.send(str);
}
}
/***********************************************************************
=head1 class HTTP;Server
Main class of the module.
=head2 Methods
=over
=cut
*/
class Server
{
var host;
var port;
var maxrequests;
var requests;
var handlers;
/*
=item Server
Constructor
=cut
*/
function Server(string host, int port)
{
self.maxrequests = 0;
if (DEBUG) Trace(host, ':', port);
self.host = host;
self.port = port;
self.requests = 0;
self.handlers = {};
}
function getHost()
{
return self.host;
}
function setMaxRequests(int limit)
{
self.maxrequests = limit;
}
function numRequests()
{
return int(self.requests);
}
function handle(string str, var handler)
{
self.handlers[str] = handler;
}
function setStatusPage(string st)
{
using statusPage;
self.handle(st, statusPage);
}
function setHelloPage(string st)
{
using helloPage;
self.handle(st, helloPage);
}
/*
=item serve
Listen and dispatch requests.
=cut
*/
function serve()
{
var listener = new 'Socket';
listener.socket(PIO_PF_INET, PIO_SOCK_STREAM, PIO_PROTO_TCP);
var address = listener.sockaddr(string(self.host), int(self.port));
listener.bind(address);
listener.listen(1);
if (DEBUG) Trace('Accepting conections');
for (;;) {
var conn = listener.accept();
int requests = self.requests;
self.requests = ++requests;
string buf = conn.recv();
var request = new Request(self, conn);
var header = getHeader(buf);
string page = header['page'];
var handler = self.handlers[page];
if (handler != null)
handler(request);
else
errorNotFound(request);
conn.close();
int maxrequests = self.maxrequests;
if (maxrequests != 0 && requests >= maxrequests)
break;
};
}
function process(var conn, string page)
{
self.sendHello(conn);
}
}
/***********************************************************************
=back
=head1 Main functions
=over
=item getConfig
Read configuration from a json file.
=cut
*/
function getConfig(string filename)
{
try {
var json = load_language('data_json');
var code = json.compile(open(filename).readall());
var data = code();
var config = data['httpserver'];
if (config == null)
throw Error('Invalid config data');
return config;
}
catch (e) {
string msg = e['message'];
die('Error loading config: ' + msg);
}
}
/*
=item createServer
Create a server object with the config provided.
=cut
*/
function createServer(config)
{
var host = config['host'];
string hostname = host['name'];
int port = host['port'];
var server = new HTTP.Server(hostname, port);
var debuginfo = config['debuginfo'];
if (debuginfo != null) {
var maxreq = debuginfo['maxrequests'];
if (maxreq != null)
server.setMaxRequests(maxreq);
var statuspage = debuginfo['statuspage'];
if (statuspage != null)
server.setStatusPage(statuspage);
var hellopage = debuginfo['hellopage'];
if (hellopage != null)
server.setHelloPage(hellopage);
}
// Load modules
var modules = {};
var configmodules = config['modules'];
if (configmodules != null)
{
for (var mod in configmodules) {
string name = mod;
if (DEBUG) Trace('module: ', name);
var moddata = configmodules[name];
var filename = moddata['file'];
var hll = moddata['hll'];
var language = moddata['load_language'];
var comp = moddata['compreg'];
var data = { };
if (language != null || comp != null) {
var compiler;
string langname;
if (language != null) {
langname = language;
string compname = comp;
try {
compiler = load_language(langname, compname);
}
catch () {
warn("Can't load language: " + langname);
}
}
else {
try {
langname = comp;
compiler = compreg(string(comp));
}
catch () {
warn("Can't compreg language: " + langname);
}
}
if (compiler != null) {
string source = open(filename).readall();
int compile = moddata['compile'];
var code = compile ? compiler.compile(source) : compiler(source);
int prerun = moddata['prerun'];
if (prerun)
code();
}
}
else {
load_bytecode(filename);
}
if (hll != null)
data["hll"] = string(hll);
modules[name] = data;
}
}
// Set handlers
var handlers = config['handlers'];
if (handlers != null) {
for (var handler in handlers) {
string base = handler['base'];
string type = handler['type'];
string name = handler['name'];
var handlerobject;
switch (type) {
case 'sub':
var glob = getinterp()['globals'];
string hllname = 'parrot';
var modulename = handler['module'];
if (modulename != null) {
var module = modules[modulename];
if (module == null)
throw Error('Module not found');
if (module['hll'])
hllname = module['hll'];
}
handlerobject = glob[hllname][name];
if (handlerobject == null)
warn("module not found for handler " + name);
else
server.handle(base, handlerobject);
break;
default:
throw Error('Urecognized handler type');
}
}
}
var security = config['security'];
if (security != null) {
var userid = security['userid'];
int uid = 0;
if (userid != null) {
uid = userid;
if (DEBUG) Trace('userid: ', uid);
}
var jail = security['chroot'];
if (jail != null) {
if (DEBUG) Trace('chroot: ', jail);
var lib = null;
var chdirfun = dlfunc(lib, 'chdir', 'it');
var chrootfun = dlfunc(lib, 'chroot', 'it');
if (chdirfun == null || chrootfun == null)
throw Error("Cannot chroot");
// Go Straight to Jail...
int r = chdirfun(string(jail));
if (r != 0)
throw Error("chdir failed");
r = chrootfun(string(jail));
if (r != 0)
throw Error("chroot failed");
if (uid) {
var setuidfun = dlfunc(lib, 'setuid', 'ii');
r = setuidfun(uid);
if (r != 0)
throw Error("setuid failed");
}
}
}
return server;
}
/***********************************************************************
=item main
Program entry point for standalone usage.
=cut
*/
function main[main,anon](argv)
{
const string OPT_CONFIG = 'config';
using extern Getopt.Obj;
var getopts = new ["Getopt", "Obj"];
getopts.notOptStop(1);
getopts.push_string(OPT_CONFIG + '=s');
argv.shift();
var opts = getopts.get_options(argv);
var optconfig = opts[OPT_CONFIG];
string configfile = optconfig != null ?
optconfig :
'examples/httpservertest/httpserver.json';
if (DEBUG) Trace('Reading config');
var config = getConfig(configfile);
if (DEBUG) Trace('Creating server object');
var server = createServer(config);
if (DEBUG) Trace('Running');
server.serve();
if (DEBUG) Trace('Stopped');
}
} // namespace HTTP
/***********************************************************************
=back
=cut
*/
// End