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#include "apiImpl.h"
#include "uptr.h"
#include <sql/getServices.sql.h>
#include <buffer.h>
#include <compileTimeFormatter.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <libxml/HTMLparser.h>
#include <libxml/HTMLtree.h>
#include <curl/curl.h>
#define CESSO(curl, opt, expr) \
BOOST_VERIFY_MSG(CURLE_OK == curl_easy_setopt(curl.get(), opt, expr), "Failed setting option " #opt);
namespace MirrorSearch {
SearchImpl::SearchImpl(IceTray::DatabasePoolPtr db) :
IceTray::AbstractDatabaseClient(db),
log(LOGMANAGER()->getLogger<SearchImpl>())
{
}
SearchServices SearchImpl::getServices(const ::Ice::Current&)
{
return fetch<SearchServices>(sql::getServices);
}
template<typename Fmt, typename ... P>
void
libxmlErrorHandler(const std::string & fn, const P & ... p)
{
throw XmlError(Fmt::get(fn, xmlGetLastError()->message, p...));
}
template<typename Fmt, typename ... P>
auto lEHB(const P & ... p)
{
return std::bind(&libxmlErrorHandler<Fmt, P...>, std::placeholders::_1, p...);
}
template<typename Fmt, typename ... P>
void
curlErrorHandler(const std::string & fn, const char * errbuf, const P & ... p)
{
throw XmlError(Fmt::get(fn, errbuf, p...));
}
template<typename Fmt, typename ... P>
auto cEHB(const char * errbuf, const P & ... p)
{
return std::bind(&curlErrorHandler<Fmt, P...>, std::placeholders::_1, errbuf, p...);
}
typedef UPtr<xmlDoc> xmlDocSPtr;
typedef UPtr<xmlXPathContext> xmlXPathContextSPtr;
typedef UPtr<xmlXPathObject> xmlXPathObjectSPtr;
typedef UPtr<xmlParserCtxt> xmlParserCtxtSPtr;
typedef std::function<size_t(const char *, size_t)> CurlWriteCallback;
static size_t write_callback(char * ptr, size_t size, size_t nmemb, void * userdata)
{
return (*(MirrorSearch::CurlWriteCallback *)(userdata))(ptr, size * nmemb);
}
AdHocFormatter(Read, "Failed to read in %? (%?) [%?]");
UPtr<xmlDoc> getDoc(const SearchServicePtr & ss, const std::string & fn) {
auto fmt = AdHoc::Buffer::getFormat(ss->baseurl);
auto url = (*fmt % fn).str();
char errbuf[CURL_ERROR_SIZE] = "";
xmlParserCtxtSPtr ctx { nullptr, nullptr };
auto curl = make_unique(curl_easy_init, curl_easy_cleanup, cEHB<Read>(errbuf, url));
BOOST_ASSERT(curl);
CESSO(curl, CURLOPT_URL, url.c_str());
CESSO(curl, CURLOPT_WRITEFUNCTION, write_callback);
CurlWriteCallback cb = [&ctx, &url, &ss](auto data, auto size) {
if (!ctx) {
ctx = make_unique(htmlCreatePushParserCtxt, htmlFreeParserCtxt, lEHB<Read>(url),
(xmlSAXHandlerPtr)NULL, (void*)NULL, data, size, url.c_str(), XML_CHAR_ENCODING_NONE);
htmlCtxtUseOptions(ctx.get(), ss->parserflags);
}
else {
htmlParseChunk(ctx.get(), data, size, 0);
}
return size;
};
CESSO(curl, CURLOPT_WRITEDATA, &cb);
if (curl_easy_perform(curl.get()) != CURLE_OK) {
curlErrorHandler<Read>(failingFunction((void*)&curl_easy_perform), errbuf, url);
}
BOOST_VERIFY_MSG(ctx, "No ctx and no previous error should never happen.");
htmlParseChunk(ctx.get(), "", 0, 1);
UPtr<xmlDoc> doc = { ctx->myDoc, xmlFreeDoc };
return doc;
}
AdHocFormatter(XPathCtx, "Failed to create xpath context in %? (%?)");
static auto getXPathCxt(const xmlDocSPtr & doc)
{
return make_unique(xmlXPathNewContext, xmlXPathFreeContext, lEHB<XPathCtx>(), doc.get());
}
AdHocFormatter(XPathEval, "Failed to evaluate xpath in %? (%?) [%?]");
static auto getXPathObj(const ::std::string & xpath, const xmlXPathContextSPtr & ctx, xmlXPathObjectType type)
{
auto xpathObj = make_unique(xmlXPathEvalExpression, xmlXPathFreeObject, lEHB<XPathEval>(xpath), BAD_CAST xpath.c_str(), ctx.get());
if (xpathObj->type != type) {
throw XmlError("Xpath evaluates to wrong type " + xpath);
}
return xpathObj;
}
void SearchImpl::callService(const ::std::string & fn, const SearchServicePtr & s, SearchHits & sh) const
{
auto doc = getDoc(s, fn);
auto xpathCtx = getXPathCxt(doc);
auto xpathObj = getXPathObj(s->listxpath, xpathCtx, xmlXPathObjectType::XPATH_NODESET);
log->messagebf(LOG::INFO, "%d nodes matched %s", xpathObj->nodesetval->nodeNr, s->listxpath);
for (int row = 0; row < xpathObj->nodesetval->nodeNr; row += 1) {
xpathCtx->node = xpathObj->nodesetval->nodeTab[row];
auto xpathObjI = getXPathObj(s->urlxpath, xpathCtx, xmlXPathObjectType::XPATH_STRING);
if (xpathObjI->stringval && *xpathObjI->stringval) {
sh.push_back(new SearchHit(0, s->id, (const char *) xpathObjI->stringval));
}
}
}
SearchHits SearchImpl::getMatches(const ::std::string & fn, const ::Ice::Current & c)
{
SearchHits sh;
for (const auto & s : getServices(c)) {
callService(fn, s, sh);
}
return sh;
}
::IceUtil::Optional<::std::string> SearchImpl::feelingLucky(const ::std::string & fn, const ::Ice::Current & c)
{
const auto ms = getMatches(fn, c);
if (ms.empty())
return IceUtil::None;
return ms.front()->url;
}
}
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