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#pragma once
#ifdef _MSC_VER
#include <io.h>
#endif
#include <library/cpp/http/misc/httpdate.h>
#include "httpagent.h"
#include "httpparser.h"
struct TFakeBackup {
int Write(void* /*buf*/, size_t /*size*/) {
return 0;
}
};
template <size_t bufsize = 5000>
struct TFakeAlloc {
void Shrink(void* /*buf*/, size_t /*size*/) {
}
void* Grab(size_t /*min*/, size_t* real) {
*real = bufsize;
return buf;
}
char buf[bufsize];
};
template <typename TAlloc = TFakeAlloc<>,
typename TCheck = TFakeCheck<>,
typename TWriter = TFakeBackup,
typename TAgent = THttpAgent<>>
class THttpFetcher: public THttpParser<TCheck>, public TAlloc, public TWriter, public TAgent {
public:
static const size_t TCP_MIN = 1500;
static int TerminateNow;
THttpFetcher()
: THttpParser<TCheck>()
, TAlloc()
, TWriter()
, TAgent()
{
}
virtual ~THttpFetcher() {
}
int Fetch(THttpHeader* header, const char* path, const char* const* headers, int persistent, bool head_request = false) {
int ret = 0;
int fetcherr = 0;
THttpParser<TCheck>::Init(header, head_request);
const char* scheme = HttpUrlSchemeKindToString((THttpURL::TSchemeKind)TAgent::GetScheme());
size_t schemelen = strlen(scheme);
if (*path == '/') {
header->base = TStringBuf(scheme, schemelen);
header->base += TStringBuf("://", 3);
header->base += TStringBuf(TAgent::pHostBeg, TAgent::pHostEnd - TAgent::pHostBeg);
header->base += path;
} else {
if (strlen(path) >= FETCHER_URL_MAX) {
header->error = HTTP_URL_TOO_LARGE;
return 0;
}
header->base = path;
}
if ((ret = TAgent::RequestGet(path, headers, persistent, head_request))) {
header->error = (i16)ret;
return 0;
}
bool inheader = 1;
void *bufptr = nullptr, *buf = nullptr, *parsebuf = nullptr;
ssize_t got;
size_t buffree = 0, bufsize = 0, buflen = 0;
size_t maxsize = TCheck::GetMaxHeaderSize();
do {
if (buffree < TCP_MIN) {
if (buf) {
TAlloc::Shrink(buf, buflen - buffree);
if (TWriter::Write(buf, buflen - buffree) < 0) {
buf = nullptr;
ret = EIO;
break;
}
}
if (!(buf = TAlloc::Grab(TCP_MIN, &buflen))) {
ret = ENOMEM;
break;
}
bufptr = buf;
buffree = buflen;
}
if ((got = TAgent::read(bufptr, buffree)) < 0) {
fetcherr = errno;
if (errno == EINTR)
header->error = HTTP_INTERRUPTED;
else if (errno == ETIMEDOUT)
header->error = HTTP_TIMEDOUT_WHILE_BYTES_RECEIVING;
else
header->error = HTTP_CONNECTION_LOST;
break;
}
parsebuf = bufptr;
bufptr = (char*)bufptr + got;
bufsize += got;
buffree -= got;
THttpParser<TCheck>::Parse(parsebuf, got);
if (header->error)
break; //if ANY error ocurred we will stop download that file or will have unprognosed stream position until MAX size reached
if (inheader && THttpParser<TCheck>::GetState() != THttpParser<TCheck>::hp_in_header) {
inheader = 0;
if (TCheck::Check(header))
break;
if (header->header_size > (long)maxsize) {
header->error = HTTP_HEADER_TOO_LARGE;
break;
}
}
if (!inheader) {
maxsize = TCheck::GetMaxBodySize(header);
}
if (header->http_status >= HTTP_EXTENDED)
break;
if (bufsize > maxsize) {
header->error = inheader ? HTTP_HEADER_TOO_LARGE : HTTP_BODY_TOO_LARGE;
break;
}
if (TerminateNow) {
header->error = HTTP_INTERRUPTED;
break;
}
} while (THttpParser<TCheck>::GetState() > THttpParser<TCheck>::hp_eof);
i64 Adjustment = 0;
if (!header->error) {
if (header->transfer_chunked) {
Adjustment = header->header_size + header->entity_size - bufsize - 1;
} else if (header->content_length >= 0) {
Adjustment = header->header_size + header->content_length - bufsize;
}
if (Adjustment > 0)
Adjustment = 0;
}
if (buf) {
TAlloc::Shrink(buf, buflen - buffree + Adjustment);
if (TWriter::Write(buf, buflen - buffree) < 0)
ret = EIO;
}
TCheck::CheckEndDoc(header);
if (ret || header->error || header->http_status >= HTTP_EXTENDED || header->connection_closed) {
TAgent::Disconnect();
if (!fetcherr)
fetcherr = errno;
}
errno = fetcherr;
return ret;
}
};
template <typename TAlloc, typename TCheck, typename TWriter, typename TAgent>
int THttpFetcher<TAlloc, TCheck, TWriter, TAgent>::TerminateNow = 0;
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