Add InfluxDB 2.x optional backend (#193)

* Add CURL to deps list

* Add URL parsing

* First working version

* Clean up and docs

CMakeLists.txt

@@ -57,6 +57,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 find_package(Boost REQUIRED COMPONENTS unit_test_framework program_options system filesystem)
 find_package(Git QUIET)
 find_package(ApMon MODULE)
+find_package(CURL MODULE)
 find_package(RdKafka CONFIG)
 
 ####################################
@@ -105,11 +106,12 @@ add_library(Monitoring SHARED
   src/Exceptions/MonitoringException.cxx
   $<$<BOOL:${ApMon_FOUND}>:src/Backends/ApMonBackend.cxx>
   $<$<BOOL:${RdKafka_FOUND}>:src/Transports/Kafka.cxx>
+  $<$<BOOL:${CURL_FOUND}>:src/Transports/HTTP.cxx>
 )
 
 target_include_directories(Monitoring
-  PUBLIC 
-    $<INSTALL_INTERFACE:include>    
+  PUBLIC
+    $<INSTALL_INTERFACE:include>
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
   PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}/src
@@ -127,6 +129,7 @@ target_link_libraries(Monitoring
     pthread
     $<$<BOOL:${ApMon_FOUND}>:ApMon::ApMon>
     $<$<BOOL:${RdKafka_FOUND}>:RdKafka::rdkafka++>
+    $<$<BOOL:${CURL_FOUND}>:CURL::libcurl>
 )
 
 # Handle ApMon optional dependency
@@ -138,6 +141,10 @@ if(RdKafka_FOUND)
    message(STATUS "  Compiling Kafka transport")
 endif()
 
+if(CURL_FOUND)
+   message(STATUS "  Compiling HTTP transport/InfluxDB 2.x backend")
+endif()
+
 # Detect operating system
 if (UNIX AND NOT APPLE)
   message(STATUS "Detected Linux: Process monitor enabled")
@@ -155,6 +162,7 @@ target_compile_definitions(Monitoring
     $<$<BOOL:${LINUX}>:O2_MONITORING_OS_LINUX>
     $<$<BOOL:${ApMon_FOUND}>:O2_MONITORING_WITH_APPMON>
     $<$<BOOL:${RdKafka_FOUND}>:O2_MONITORING_WITH_KAFKA>
+    $<$<BOOL:${CURL_FOUND}>:O2_MONITORING_WITH_CURL>
   )
 
 # Use C++17
@@ -217,7 +225,7 @@ foreach (test ${TEST_SRCS})
 
   add_executable(${test_name} ${test})
   target_link_libraries(${test_name}
-    PRIVATE 
+    PRIVATE
       Monitoring Boost::unit_test_framework Boost::filesystem
   )
   add_test(NAME ${test_name} COMMAND ${test_name})

README.md

@@ -48,6 +48,7 @@ See the table below to find `URI`s for supported backends:
 | InfluxDB     | Unix socket | `influxdb-unix`        | -           | `info`            |
 | InfluxDB     | StdOut      | `influxdb-stdout`      | -           | `info`            |
 | InfluxDB     | Kafka       | `influxdb-kafka`       | Kafka topic | `info`            |
+| InfluxDB 2.x | HTTP        | `influxdbv2`           | `org=ORG&bucket=BUCKET&token=TOKEN` | `info` |
 | ApMon        | UDP         | `apmon`                | -           | `info`            |
 | StdOut       | -           | `stdout`, `infologger` | [Prefix]    | `debug`           |
 
@@ -62,7 +63,7 @@ A metric consist of 5 parameters:
 | Parameter name | Type                             | Required | Default                 |
 | -------------- |:--------------------------------:|:--------:| -----------------------:|
 | name           | string                           | yes      | -                       |
-| values          | map<string, int/double/string/uint64_t> | no/1      | -                       |
+| values         | map<string, int/double/string/uint64_t> | no/1      | -                       |
 | timestamp      | time_point<system_clock>   | no       | current time            |
 | verbosity      | Enum (Debug/Info/Prod)           | no       | Verbosity::Info         |
 | tags           | map             | no       | host and process names  |

src/MonitoringFactory.cxx

@@ -36,6 +36,10 @@
 #include "Transports/Kafka.h"
 #endif
 
+#ifdef O2_MONITORING_WITH_CURL
+#include "Transports/HTTP.h"
+#endif
+
 namespace o2
 {
 /// ALICE O2 Monitoring system
@@ -56,6 +60,37 @@ std::unique_ptr<Backend> getStdOut(http::url uri)
   }
 }
 
+/// Extracts token from header add sets it as addition HTTP header
+/// http://localhost:9999/?org=YOUR_ORG&bucket=YOUR_BUCKET&token=AUTH_TOKEN
+/// ->
+/// http://localhost:9999/api/v2/write?org=YOUR_ORG&bucket=YOUR_BUCKET
+/// --header "Authorization: Token YOURAUTHTOKEN"
+std::unique_ptr<Backend> getInfluxDbv2(http::url uri)
+{
+#ifdef O2_MONITORING_WITH_CURL
+  std::string tokenLabel = "token=";
+  std::string path = "/api/v2/write";
+  std::string query = uri.search;
+
+  auto tokenStart = query.find(tokenLabel);
+  auto tokenEnd = query.find('&', tokenStart);
+  if (tokenEnd == std::string::npos) {
+    tokenEnd = query.length();
+  }
+  std::string token = query.substr(tokenStart + tokenLabel.length(), tokenEnd-(tokenStart + tokenLabel.length()));
+  // make sure ampersand is removed
+  if (tokenEnd < query.length() && query.at(tokenEnd) == '&') tokenEnd++;
+  if (tokenStart > 0 && query.at(tokenStart-1) == '&') tokenStart--;
+  query.erase(tokenStart, tokenEnd - tokenStart);
+
+  auto transport = std::make_unique<transports::HTTP>("http://" + uri.host + ':' + std::to_string(uri.port) + path + '?' + query);
+  transport->addHeader("Authorization: Token " + token);
+  return std::make_unique<backends::InfluxDB>(std::move(transport));
+#else
+  throw std::runtime_error("HTTP transport is not enabled");
+#endif
+}
+
 std::unique_ptr<Backend> getInfluxDb(http::url uri)
 {
   auto const position = uri.protocol.find_last_of('-');
@@ -129,6 +164,7 @@ std::unique_ptr<Backend> MonitoringFactory::GetBackend(std::string& url)
     {"influxdb-unix", getInfluxDb},
     {"influxdb-stdout", getInfluxDb},
     {"influxdb-kafka", getInfluxDb},
+    {"influxdbv2", getInfluxDbv2},
     {"apmon", getApMon},
     {"no-op", getNoop}
   };

src/Transports/HTTP.cxx

@@ -0,0 +1,68 @@
+///
+/// \file HTTP.cxx
+/// \author Adam Wegrzynek <adam.wegrzynek@cern.ch>
+///
+
+#include "HTTP.h"
+#include "../MonLogger.h"
+#include "../Exceptions/MonitoringException.h"
+#include <boost/algorithm/string.hpp>
+
+namespace o2
+{
+/// ALICE O2 Monitoring system
+namespace monitoring
+{
+/// Monitoring transports
+namespace transports
+{
+
+HTTP::HTTP(const std::string& url)
+{
+  mHeaders = NULL;
+  mCurl = curl_easy_init();
+  curl_easy_setopt(mCurl, CURLOPT_URL, url.c_str());
+  curl_easy_setopt(mCurl, CURLOPT_SSL_VERIFYPEER, 0);
+  curl_easy_setopt(mCurl, CURLOPT_CONNECTTIMEOUT, 10);
+  curl_easy_setopt(mCurl, CURLOPT_TIMEOUT, 10);
+  curl_easy_setopt(mCurl, CURLOPT_POST, 1);
+  curl_easy_setopt(mCurl, CURLOPT_TCP_KEEPIDLE, 120L);
+  curl_easy_setopt(mCurl, CURLOPT_TCP_KEEPINTVL, 60L);
+  FILE *devnull = fopen("/dev/null", "w+");
+  curl_easy_setopt(mCurl, CURLOPT_WRITEDATA, devnull);
+
+  MonLogger::Get() << "HTTP transport initialized (" << url << ")" << MonLogger::End();
+}
+
+HTTP::~HTTP()
+{
+  curl_slist_free_all(mHeaders);
+  curl_easy_cleanup(mCurl);
+  curl_global_cleanup();
+}
+
+void HTTP::addHeader(const std::string& header)
+{
+  mHeaders = curl_slist_append(mHeaders, header.c_str());
+  curl_easy_setopt(mCurl,  CURLOPT_HTTPHEADER, mHeaders);
+}
+
+void HTTP::send(std::string&& post)
+{
+  CURLcode response;
+  long responseCode;
+  curl_easy_setopt(mCurl, CURLOPT_POSTFIELDS, post.c_str());
+  curl_easy_setopt(mCurl, CURLOPT_POSTFIELDSIZE, (long) post.length());
+  response = curl_easy_perform(mCurl);
+  curl_easy_getinfo(mCurl, CURLINFO_RESPONSE_CODE, &responseCode);
+  if (response != CURLE_OK) {
+    MonLogger::Get() << "HTTP Tranport " << curl_easy_strerror(response) << MonLogger::End();
+  }
+  if (responseCode < 200 || responseCode > 206) {
+    MonLogger::Get() << "HTTP Transport: Response code : " << std::to_string(responseCode) << MonLogger::End();
+  }
+}
+
+} // namespace transports
+} // namespace monitoring
+} // namespace o2

src/Transports/HTTP.h

@@ -0,0 +1,54 @@
+///
+/// \file HTTP.h
+/// \author Adam Wegrzynek <adam.wegrzynek@cern.ch>
+///
+
+#ifndef ALICEO2_MONITORING_TRANSPORTS_HTTP_H
+#define ALICEO2_MONITORING_TRANSPORTS_HTTP_H
+
+#include "TransportInterface.h"
+
+#include <curl/curl.h>
+#include <string>
+
+namespace o2
+{
+/// ALICE O2 Monitoring system
+namespace monitoring
+{
+/// Monitoring transports
+namespace transports
+{
+
+/// \brief HTTP POST transport
+///
+/// Allows to push string formatted metrics as HTTP POST requests via cURL
+class HTTP : public TransportInterface
+{
+  public:
+    /// Constructor
+    /// \param url          URL of HTTP server endpoint
+    HTTP(const std::string& url);
+
+    /// Destructor
+    ~HTTP();
+
+    /// Sends metric via HTTP POST
+    /// \param post       r-value reference string formatted metric
+    void send(std::string&& post);
+
+    /// Adds custom HTTP header
+    void addHeader(const std::string& header);
+  private:
+    /// CURL pointers
+    CURL *mCurl;
+
+    /// HTTP headers struct
+    struct curl_slist *mHeaders;
+};
+
+} // namespace transports
+} // namespace monitoring
+} // namespace o2
+
+#endif // ALICEO2_MONITORING_TRANSPORTS_HTTP_H

src/UriParser/UriParser.h

@@ -29,7 +29,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 namespace http
 {
 struct url {
-  std::string protocol, user, password, host, path, search;
+  std::string protocol, user, password, host, path, search, url;
   int port;
 };
 
@@ -89,7 +89,7 @@ static inline url ParseHttpUrl(std::string& in)
 {
   url ret;
   ret.port = -1;
-
+  ret.url = in;
   ret.protocol = ExtractProtocol(in);
   ret.search = ExtractSearch(in);
   ret.path = ExtractPath(in);

test/testInfluxDb.cxx

@@ -19,7 +19,6 @@ namespace monitoring
 {
 namespace Test
 {
-
 BOOST_AUTO_TEST_CASE(simplySendMetric)
 {
   auto monitoring = MonitoringFactory::Get("influxdb-udp://localhost:1000");
@@ -32,6 +31,11 @@ BOOST_AUTO_TEST_CASE(simplySendMetric2)
   monitoring->send(Metric{10, "myCrazyMetric"});
 }
 
+BOOST_AUTO_TEST_CASE(InfluxDbv2)
+{
+  auto monitoring = MonitoringFactory::Get("influxdbv2://localhost:9999?org=cern&bucket=test&token=TOKEN");
+}
+
 } // namespace Test
 } // namespace monitoring
 } // namespace o2