static void BuildIndices(const char *feedsFileURL, rssFeedData *dataPtr)
{
url u;
urlconnection urlconn;
URLNewAbsolute(&u, feedsFileURL);
URLConnectionNew(&urlconn, &u);
if (urlconn.responseCode / 100 == 3) { // redirection, so recurse
BuildIndices(urlconn.newUrl, dataPtr);
} else {
streamtokenizer st;
char remoteDocumentURL[2048];
STNew(&st, urlconn.dataStream, kNewLineDelimiters, true);
while (STSkipUntil(&st, ":") != EOF) { // ignore everything up to the first selicolon of the line
STSkipOver(&st, ": "); // now ignore the semicolon and any whitespace directly after it
STNextToken(&st, remoteDocumentURL, sizeof(remoteDocumentURL));
ProcessFeed(remoteDocumentURL, dataPtr);
}
printf("\n");
STDispose(&st);
}
URLConnectionDispose(&urlconn);
URLDispose(&u);
}
static void ParseArticle(const char *articleTitle,const char *articleDescription,
const char *articleURL,hashset* stopWords,
hashset* wordHash,hashset *articlesSeen)
{
url u;
urlconnection urlconn;
streamtokenizer st;
URLNewAbsolute(&u, articleURL);
URLConnectionNew(&urlconn, &u);
article currArt;
currArt.server = strdup(u.serverName);
currArt.title = strdup(articleTitle);
currArt.url = strdup(articleURL);
currArt.numOccurrences = 0;
switch (urlconn.responseCode) {
case 0: printf("Unable to connect to \"%s\". Domain name or IP address is nonexistent.\n", articleURL);
ArticleFree(&currArt);
break;
case 200:
if(HashSetLookup(articlesSeen,&currArt)== NULL){ //if we haven't seen this article before
printf("[%s] Indexing \"%s\"\n", u.serverName,articleTitle);
HashSetEnter(articlesSeen, &currArt);
STNew(&st, urlconn.dataStream, kTextDelimiters, false);
ScanArticle(&st, &currArt, stopWords, wordHash, articlesSeen);
STDispose(&st);
break;
}
else { //if we have seen it before
printf("[Ignoring \"%s\": we've seen it before.]\n",
articleTitle);
ArticleFree(&currArt);
break;
}
case 301:
case 302: // just pretend we have the redirected URL all along,though index using the new URL and not the old one...
ParseArticle(articleTitle, articleDescription,
urlconn.newUrl, stopWords, wordHash,articlesSeen);
ArticleFree(&currArt);
break;
default: printf("Unable to pull \"%s\" from \"%s\". [Response code: %d] Punting...\n", articleTitle, u.serverName, urlconn.responseCode);
ArticleFree(&currArt);
break;
}
URLConnectionDispose(&urlconn);
URLDispose(&u);
}
static void ParseArticle(const char *articleURL, const char *articleTitle, rssData *allData)
{
url u;
urlconnection urlconn;
streamtokenizer st;
int articleIndex;
URLNewAbsolute(&u, articleURL);
/* check to see if we've previously scanned the article. If the article we're processing
* has already been scanned release the url and return
*/
article a = {articleURL, articleTitle, u.serverName};
if(VectorSearch(&allData->explored, &a, ArticleCmp, 0, false) >= 0) {
printf("[Pass. article already indexed: \"%s\"]\n", articleTitle);
URLDispose(&u);
return;
}
URLConnectionNew(&urlconn, &u);
switch (urlconn.responseCode) {
case 0: printf("Unable to connect to \"%s\". Domain name or IP address is nonexistent.\n", articleURL);
break;
case 200: printf("Scanning \"%s\" from \"http://%s\"\n", articleTitle, u.serverName);
STNew(&st, urlconn.dataStream, kTextDelimiters, false);
PersistArticle(&a, articleURL, articleTitle, u.serverName);
VectorAppend(&allData->explored, &a);
articleIndex = VectorLength(&allData->explored)-1;
ScanArticle(&st, &a, articleIndex, allData);
STDispose(&st);
break;
case 301:
case 302: // just pretend we have the redirected URL all along, though index using the new URL and not the old one...
ParseArticle(urlconn.newUrl, articleTitle, allData );
break;
default: printf("Unable to pull \"%s\" from \"%s\". [Response code: %d] Punting...\n", articleTitle, u.serverName, urlconn.responseCode);
break;
}
URLConnectionDispose(&urlconn);
URLDispose(&u);
}
static void ProcessFeed(rssDatabase *db, const char *remoteDocumentName)
{
url u;
urlconnection urlconn;
URLNewAbsolute(&u, remoteDocumentName);
URLConnectionNew(&urlconn, &u);
switch (urlconn.responseCode) {
case 0: printf("Unable to connect to \"%s\". Ignoring...", u.serverName);
break;
case 200: PullAllNewsItems(db, &urlconn);
break;
case 301:
case 302: ProcessFeed(db, urlconn.newUrl);
break;
default: printf("Connection to \"%s\" was established, but unable to retrieve \"%s\". [response code: %d, response message:\"%s\"]\n",
u.serverName, u.fileName, urlconn.responseCode, urlconn.responseMessage);
break;
};
URLConnectionDispose(&urlconn);
URLDispose(&u);
}
static void ProcessFeed(const char *remoteDocumentName, hashset *stopWords, hashset *prevSeenArticles, hashset *wordCounts)
{
url u;
urlconnection urlconn;
URLNewAbsolute(&u, remoteDocumentName);
URLConnectionNew(&urlconn, &u);
switch (urlconn.responseCode) {
case 0: printf("Unable to connect to \"%s\". Ignoring...", u.serverName);
break;
case 200: PullAllNewsItems(&urlconn, stopWords, prevSeenArticles, wordCounts);
break;
case 301:
case 302: ProcessFeed(urlconn.newUrl, stopWords, prevSeenArticles, wordCounts);
break;
default: printf("Connection to \"%s\" was established, but unable to retrieve \"%s\". [response code: %d, response message:\"%s\"]\n",
u.serverName, u.fileName, urlconn.responseCode, urlconn.responseMessage);
break;
};
URLConnectionDispose(&urlconn);
URLDispose(&u);
}
static void LoadStopWords(const char *stopWordsURL, rssFeedData *dataPtr) {
url u;
urlconnection urlconn;
URLNewAbsolute(&u, stopWordsURL);
URLConnectionNew(&urlconn, &u);
if(urlconn.responseCode / 100 == 3) {
LoadStopWords(urlconn.newUrl, dataPtr);
} else {
streamtokenizer st;
char buffer[4096];
STNew(&st, urlconn.dataStream, kNewLineDelimiters, true);
while (STNextToken(&st, buffer, sizeof(buffer))) {
char *s = strdup(buffer);
HashSetEnter(&(dataPtr->stopWords), &s);
//printf("%s\n", buffer);
}
printf("\n");
STDispose(&st);
}
URLConnectionDispose(&urlconn);
URLDispose(&u);
}
static void Welcome(const char *welcomeTextURL)
{
url u;
urlconnection urlconn;
URLNewAbsolute(&u, welcomeTextURL);
URLConnectionNew(&urlconn, &u);
if (urlconn.responseCode / 100 == 3) {
Welcome(urlconn.newUrl);
} else {
streamtokenizer st;
char buffer[4096];
STNew(&st, urlconn.dataStream, kNewLineDelimiters, true);
while (STNextToken(&st, buffer, sizeof(buffer))) {
printf("%s\n", buffer);
}
printf("\n");
STDispose(&st); // remember that STDispose doesn't close the file, since STNew doesn't open one..
}
URLConnectionDispose(&urlconn);
URLDispose(&u);
}
