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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(&current_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