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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#include "subscriber_sse.h" |
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#include <memory> |
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#include <vector> |
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#include "url.h" |
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#include "util/logging.h" |
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#include "util/string.h" |
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namespace { |
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const LogFacilities &kLogInfo = DefaultLogging::info; |
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const LogFacilities &kLogError = DefaultLogging::error; |
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} // namespace |
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namespace notify { |
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SubscriberSSE::SubscriberSSE(const std::string &server_url) |
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: Subscriber() |
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, server_url_(server_url + "/notifications/subscribe") |
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, topic_() |
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, buffer_() |
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, should_quit_(false) { } |
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SubscriberSSE::~SubscriberSSE() { } |
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bool SubscriberSSE::Subscribe(const std::string &topic) { |
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const std::unique_ptr<Url> url(Url::Parse(server_url_)); |
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if (url.get() == nullptr) { |
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LogCvmfs(kLogCvmfs, kLogError, |
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"SubscriberSSE - could not parse notification server url: %s\n", |
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server_url_.c_str()); |
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return false; |
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} |
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this->topic_ = topic; |
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const std::string request = "{\"version\":1,\"repository\":\"" + topic |
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+ "\"}"; |
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const char *user_agent_string = "cvmfs/" CVMFS_VERSION; |
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CURL *h_curl = curl_easy_init(); |
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if (h_curl == NULL) { |
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LogCvmfs(kLogCvmfs, kLogError, "Could not create Curl handle\n"); |
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return false; |
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} |
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if (h_curl) { |
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curl_easy_setopt(h_curl, CURLOPT_NOPROGRESS, 0L); |
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curl_easy_setopt(h_curl, CURLOPT_USERAGENT, user_agent_string); |
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curl_easy_setopt(h_curl, CURLOPT_MAXREDIRS, 50L); |
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curl_easy_setopt(h_curl, CURLOPT_CUSTOMREQUEST, "GET"); |
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} |
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if (!h_curl) { |
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LogCvmfs(kLogCvmfs, kLogError, |
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"SubscriberSSE - error initializing CURL context\n"); |
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return false; |
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} |
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// Make request to acquire lease from repo services |
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curl_easy_setopt(h_curl, CURLOPT_URL, server_url_.c_str()); |
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curl_easy_setopt(h_curl, CURLOPT_POSTFIELDSIZE_LARGE, |
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static_cast<curl_off_t>(request.length())); |
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curl_easy_setopt(h_curl, CURLOPT_POSTFIELDS, request.c_str()); |
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curl_easy_setopt(h_curl, CURLOPT_WRITEFUNCTION, CurlRecvCB); |
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curl_easy_setopt(h_curl, CURLOPT_WRITEDATA, this); |
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curl_easy_setopt(h_curl, CURLOPT_XFERINFOFUNCTION, CurlProgressCB); |
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curl_easy_setopt(h_curl, CURLOPT_XFERINFODATA, this); |
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bool success = true; |
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const CURLcode ret = curl_easy_perform(h_curl); |
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if (ret && ret != CURLE_ABORTED_BY_CALLBACK) { |
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LogCvmfs(kLogCvmfs, kLogError, |
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"SubscriberSSE - event loop finished with error: %d. Reply: %s\n", |
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ret, this->buffer_.c_str()); |
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success = false; |
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} |
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curl_easy_cleanup(h_curl); |
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h_curl = NULL; |
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return success; |
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} |
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void SubscriberSSE::Unsubscribe() { atomic_write32(&should_quit_, 1); } |
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bool SubscriberSSE::ShouldQuit() const { return atomic_read32(&should_quit_); } |
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void SubscriberSSE::AppendToBuffer(const std::string &s) { |
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size_t start = 0; |
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if (s.substr(0, 6) == "data: ") { |
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start = 6; |
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} |
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buffer_ += s.substr(start); |
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} |
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void SubscriberSSE::ClearBuffer() { buffer_.clear(); } |
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size_t SubscriberSSE::CurlRecvCB(void *buffer, size_t size, size_t nmemb, |
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void *userp) { |
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notify::SubscriberSSE *sub = static_cast<notify::SubscriberSSE *>(userp); |
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if (size * nmemb < 1) { |
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return 0; |
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} |
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const std::string buf(static_cast<char *>(buffer)); |
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std::vector<std::string> lines = SplitString(buf, '\n'); |
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if (lines.size() == 1) { |
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sub->AppendToBuffer(lines[0]); |
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} else { |
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sub->AppendToBuffer(lines[0]); |
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const notify::Subscriber::Status st = sub->Consume(sub->topic_, |
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sub->buffer_); |
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sub->ClearBuffer(); |
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for (size_t i = 1; i < lines.size(); ++i) { |
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if (lines[i].substr(0, 5) == "data: ") { |
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sub->AppendToBuffer(lines[i]); |
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} |
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} |
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switch (st) { |
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case notify::Subscriber::kFinish: |
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sub->Unsubscribe(); |
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break; |
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case notify::Subscriber::kError: |
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return 0; |
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default: |
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break; |
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} |
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} |
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return size * nmemb; |
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} |
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int SubscriberSSE::CurlProgressCB(void *clientp, curl_off_t dltotal, |
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curl_off_t dlnow, curl_off_t ultotal, |
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curl_off_t ulnow) { |
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notify::SubscriberSSE *sub = static_cast<notify::SubscriberSSE *>(clientp); |
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if (sub->ShouldQuit()) { |
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LogCvmfs(kLogCvmfs, kLogInfo, |
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"SubscriberSSE - quit request received. Stopping\n"); |
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return 1; |
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} |
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return 0; |
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} |
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} // namespace notify |
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