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psyced/world/net/http/fetch.c

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2009-01-26 20:12:53 +00:00
// $Id: fetch.c,v 1.42 2008/12/10 22:53:33 lynx Exp $ // vim:syntax=lpc
//
// generic HTTP GET client, mostly used for RSS -
// but we could fetch any page or data with it, really
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// tobij even allowed the object to have the URL as its object name. fancy! ;)
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#ifdef Dfetch
# undef DEBUG
# define DEBUG Dfetch
#endif
#include <ht/http.h>
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#include <net.h>
#include <uniform.h>
#include <services.h>
#include <regexp.h>
virtual inherit NET_PATH "output"; // virtual: in case we get inherited..
inherit NET_PATH "connect";
//inherit NET_PATH "place/master";
inherit NET_PATH "queue";
// additional headers. we keep them lower-case to ensure we have no
// double items in there. HTTP ignores case by spec.
volatile mapping rheaders = ([ "user-agent": SERVER_VERSION ]);
volatile mapping headers, fheaders;
volatile string http_message;
volatile int http_status, port, fetching, ssl;
volatile string buffer, thehost, url, fetched, host, resource, method;
volatile mixed rbody;
int parse_status(string all);
int parse_header(string all);
int buffer_content(string all);
string qHost() { return thehost; }
varargs void fetch(string murl, string meth, mixed body, mapping hdrs) {
method = meth || "GET";
rbody = body;
if (hdrs) rheaders += hdrs;
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if (url != murl) {
// accept.c does this for us:
//url = replace(murl, ":/", "://");
// so we can use this method also in a normal way
url = murl;
// resource may need to be re-parsed (other params)
resource = 0;
// re-parse the hostname?
//thehost = port = 0;
}
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P3(("%O: fetch(%O)\n", ME, url))
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unless (fetching) connect();
}
object load() { return ME; }
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void sAuth(string user, string password) {
rheaders["authorization"] = "basic "+ encode_base64(user +":"+ password);
}
string sAgent(string a) { return rheaders["user-agent"] = a; }
// net/place/news code follows.
void connect() {
mixed t;
fetching = 1;
ssl = 0;
unless (thehost) {
unless (sscanf(url, "http%s://%s/%!s", t, thehost)) {
P0(("%O couldn't parse %O\n", ME, url))
return 0;
}
//thehost = lower_case(thehost); // why? who needs that?
ssl = t == "s";
}
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P4(("URL, THEHOST: %O, %O\n", url, thehost))
unless (port) {
unless (sscanf(thehost, "%s:%d", thehost, port) == 2)
port = ssl? HTTPS_SERVICE: HTTP_SERVICE;
rheaders["host"] = thehost;
}
P2(("Resolving %O and connecting.\n", thehost))
::connect(thehost, port);
}
// some people think these are case sensitive.. let's fix it for them (only works for most cases)
string http_header_capitalize(string name) {
return regreplace(name, "(^.|-.)", (: return upper_case($1); :), 1);
}
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varargs int real_logon(int failure) {
string scheme;
headers = ([ ]);
http_status = 500;
http_message = "(failure)"; // used by debug only
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unless(::logon(failure)) return -1;
unless (url) return -3;
unless (resource) sscanf(url, "%s://%s/%s", scheme, host, resource);
string body = "";
if (stringp(rbody)) {
body = rbody;
} else if (mappingp(rbody) && sizeof(rbody)) {
body = make_query_string(rbody);
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unless (rheaders["content-type"])
rheaders["content-type"] = "application/x-www-form-urlencoded";
}
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if (strlen(body)) rheaders["content-length"] = strlen(body);
buffer = "";
foreach (string key, string value : rheaders) {
buffer += http_header_capitalize(key) + ": " + value + "\r\n";
}
// we won't need connection: close w/ http/1.0
//emit("Connection: close\r\n\r\n");
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P2(("%O fetching /%s from %O\n", ME, resource, host))
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P4(("%O using %O\n", ME, buffer))
emit(method + " /"+ resource +" HTTP/1.0\r\n"
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+ buffer + "\r\n" + body);
buffer = "";
next_input_to(#'parse_status);
return 0; // duh.
}
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varargs int logon(int failure, int sub) {
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// net/connect disables telnet for all robots and circuits
#if 0 //__EFUN_DEFINED__(enable_telnet)
// when fetching the spiegel rss feed, telnet_neg() occasionally
// crashes. fixing that would be cool, but why have the telnet
// machine enabled at all?
enable_telnet(0);
#endif
// when called from xmlrpc.c we can't do TLS anyway
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if (sub) return ::logon(failure);
if (ssl) tls_init_connection(ME, #'real_logon);
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else real_logon(failure);
return 0; // duh.
}
int parse_status(string all) {
string prot;
string state;
sscanf(all, "%s%t%s", prot, state);
sscanf(state, "%d%t%s", http_status, http_message);
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if (http_status != R_OK) {
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P0(("%O got %O %O from %O\n", ME,
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http_status, http_message, host));
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monitor_report("_failure_unsupported_code_HTTP",
S("http/fetch'ing %O returned %O %O", url || ME,
http_status, http_message));
}
next_input_to(#'parse_header);
return 1;
}
int parse_header(string all) {
string key, val;
// TODO: parse status code
if (all != "") {
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P2(("http/fetch::parse_header %O\n", all))
if (sscanf(all, "%s:%1.0t%s", key, val) == 2) {
headers[lower_case(key)] = val;
// P2(("ht head: %O = %O\n", key, val))
}
next_input_to(#'parse_header);
return 1;
} else {
// das wollen wir nur bei status 200
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P2(("%O now waiting for http body\n", ME))
next_input_to(#'buffer_content);
return 1;
}
return 1;
}
int buffer_content(string all) {
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P2(("%O body %O\n", ME, all))
buffer += all + "\n";
next_input_to(#'buffer_content);
return 1;
}
disconnected(remainder) {
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P2(("%O got disconnected.. %O\n", ME, remainder))
headers["_fetchtime"] = isotime(ctime(time()), 1);
if (headers["last-modified"])
rheaders["if-modified-since"] = headers["last-modified"];
//if (headers["etag"])
// rheaders["if-none-match"] = headers["etag"]; // heise does not work with etag
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fetched = buffer;
if (remainder) fetched += remainder;
fheaders = headers;
buffer = headers = 0;
switch (http_status) {
default:
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mixed *waiter;
while (qSize(ME)) {
waiter = shift(ME);
P2(("%O calls back.. body is %O\n", ME, fetched))
funcall(waiter[0], fetched, waiter[1] ? fheaders : copy(fheaders), http_status);
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}
if (http_status == R_OK) break;
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// doesn't seem to get here when HTTP returns 301 or 302. strange.
// fall thru
case R_NOTMODIFIED:
qDel(ME);
qInit(ME, 150, 5);
}
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fetching = 0;
return 1; // presume this disc was expected
}
varargs string content(closure cb, int force, int willbehave) {
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if (cb) {
if (fetched) {
if (force) {
funcall(cb, fetched, willbehave ? fheaders : copy(fheaders));
}
} else {
enqueue(ME, ({ cb, willbehave }));
}
}
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return fetched;
}
varargs mapping headers(int willbehave) {
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return willbehave ? fheaders : copy(fheaders);
}
string qHeader(mixed key) {
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if (mappingp(fheaders)) return fheaders[key];
return 0;
}
string qReqHeader(string key) {
return rheaders[lower_case(key)];
}
void sReqHeader(string key, string value) {
rheaders[lower_case(key)] = value;
}
varargs void refetch(closure cb, int willbehave) {
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enqueue(ME, ({ cb, willbehave }));
unless (fetching) connect();
}
protected create() {
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qCreate();
qInit(ME, 150, 5);
}