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/**
* Copyright (c) 2015, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Timothy Stack nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef url_loader_hh
#define url_loader_hh
#include "config.h"
#ifdef HAVE_LIBCURL
# include <curl/curl.h>
# include <paths.h>
# include "base/fs_util.hh"
# include "curl_looper.hh"
class url_loader : public curl_request {
public:
url_loader(const std::string& url) : curl_request(url)
{
auto tmp_res = lnav::filesystem::open_temp_file(
ghc::filesystem::temp_directory_path() / "lnav.url.XXXXXX");
if (tmp_res.isErr()) {
return;
}
auto tmp_pair = tmp_res.unwrap();
ghc::filesystem::remove(tmp_pair.first);
this->ul_fd = std::move(tmp_pair.second);
curl_easy_setopt(this->cr_handle, CURLOPT_URL, this->cr_name.c_str());
curl_easy_setopt(this->cr_handle, CURLOPT_WRITEFUNCTION, write_cb);
curl_easy_setopt(this->cr_handle, CURLOPT_WRITEDATA, this);
curl_easy_setopt(this->cr_handle, CURLOPT_FILETIME, 1);
curl_easy_setopt(this->cr_handle, CURLOPT_BUFFERSIZE, 128L * 1024L);
}
int get_fd() const { return this->ul_fd.get(); }
auto_fd copy_fd() const { return this->ul_fd.dup(); }
long complete(CURLcode result)
{
curl_request::complete(result);
switch (result) {
case CURLE_OK:
break;
case CURLE_BAD_DOWNLOAD_RESUME:
break;
default:
log_error("%s:curl failure -- %ld %s",
this->cr_name.c_str(),
result,
curl_easy_strerror(result));
log_perror(write(this->ul_fd,
this->cr_error_buffer,
strlen(this->cr_error_buffer)));
return -1;
}
long file_time;
CURLcode rc;
rc = curl_easy_getinfo(this->cr_handle, CURLINFO_FILETIME, &file_time);
if (rc == CURLE_OK) {
time_t current_time;
time(¤t_time);
if (file_time == -1
|| (current_time - file_time) < FOLLOW_IF_MODIFIED_SINCE) {
char range[64];
struct stat st;
off_t start;
fstat(this->ul_fd, &st);
if (st.st_size > 0) {
start = st.st_size - 1;
this->ul_resume_offset = 1;
} else {
start = 0;
this->ul_resume_offset = 0;
}
snprintf(range, sizeof(range), "%ld-", (long) start);
curl_easy_setopt(this->cr_handle, CURLOPT_RANGE, range);
return 2000;
} else {
log_debug("URL was not recently modified, not tailing: %s",
this->cr_name.c_str());
}
} else {
log_error("Could not get file time for URL: %s -- %s",
this->cr_name.c_str(),
curl_easy_strerror(rc));
}
return -1;
}
private:
static const long FOLLOW_IF_MODIFIED_SINCE = 60 * 60;
static ssize_t write_cb(void* contents,
size_t size,
size_t nmemb,
void* userp)
{
url_loader* ul = (url_loader*) userp;
char* c_contents = (char*) contents;
ssize_t retval;
c_contents += ul->ul_resume_offset;
retval = write(
ul->ul_fd, c_contents, (size * nmemb) - ul->ul_resume_offset);
retval += ul->ul_resume_offset;
ul->ul_resume_offset = 0;
return retval;
}
auto_fd ul_fd;
off_t ul_resume_offset{0};
};
#endif
#endif
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