[QC-652] Add a method to update the metadata of an object.

CCDB/include/CCDB/CcdbApi.h

@@ -180,6 +180,15 @@ class CcdbApi //: public DatabaseInterface
    */
   void deleteObject(std::string const& path, long timestamp = -1) const;
 
+  /**
+   * Update the metadata of the object defined by the provided timestamp, and id if provided.
+   * @param path Path to the object to update
+   * @param metadata The metadata to update
+   * @param timestamp The timestamp to select the object
+   * @param id The id, if any, to select the object
+   */
+  void updateMetadata(std::string const& path, std::map<std::string, std::string> const& metadata, long timestamp, std::string const& id = "");
+
   /**
    * Return the listing of objects, and in some cases subfolders, matching this path.
    * The path can contain sql patterns (correctly encoded) or regexps.

CCDB/src/CcdbApi.cxx

@@ -1339,5 +1339,44 @@ TClass* CcdbApi::tinfo2TClass(std::type_info const& tinfo)
   return cl;
 }
 
+void CcdbApi::updateMetadata(std::string const& path, std::map<std::string, std::string> const& metadata, long timestamp, std::string const& id)
+{
+  CURL* curl;
+  CURLcode res;
+  stringstream fullUrl;
+  fullUrl << mUrl << "/" << path << "/" << timestamp;
+  if (!id.empty()) {
+    fullUrl << "/" << id;
+  }
+  fullUrl << "?";
+
+  curl = curl_easy_init();
+
+  for (auto& kv : metadata) {
+    string mfirst = kv.first;
+    string msecond = kv.second;
+    // same trick for the metadata as for the object type
+    char* mfirstEncoded = curl_easy_escape(curl, mfirst.c_str(), mfirst.size());
+    char* msecondEncoded = curl_easy_escape(curl, msecond.c_str(), msecond.size());
+    fullUrl << string(mfirstEncoded) + "=" + string(msecondEncoded) + "&";
+    curl_free(mfirstEncoded);
+    curl_free(msecondEncoded);
+  }
+
+  if (curl != nullptr) {
+    curl_easy_setopt(curl, CURLOPT_URL, fullUrl.str().c_str());
+    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT"); // make sure we use PUT
+
+    curlSetSSLOptions(curl);
+
+    // Perform the request, res will get the return code
+    res = curl_easy_perform(curl);
+    if (res != CURLE_OK) {
+      fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
+    }
+    curl_easy_cleanup(curl);
+  }
+}
+
 } // namespace ccdb
 } // namespace o2

CCDB/test/testCcdbApi.cxx

@@ -24,22 +24,14 @@
 #include "CCDB/CCDBTimeStampUtils.h"
 #include <boost/test/unit_test.hpp>
 #include <filesystem>
-#include <cstdio>
-#include <cassert>
 #include <iostream>
-#include <cstdio>
-#include <curl/curl.h>
-#include <sys/stat.h>
-#include <fcntl.h>
 #include <TH1F.h>
 #include <chrono>
 #include <CommonUtils/StringUtils.h>
-#include <TMessage.h>
 #include <TStreamerInfo.h>
 #include <TGraph.h>
 #include <TTree.h>
 #include <TString.h>
-#include <sys/types.h>
 #include <unistd.h>
 
 #include <boost/property_tree/json_parser.hpp>
@@ -479,3 +471,66 @@ BOOST_AUTO_TEST_CASE(TestRetrieveHeaders, *utf::precondition(if_reachable()))
   }
   BOOST_CHECK_EQUAL(headers.size(), 0);
 }
+
+BOOST_AUTO_TEST_CASE(TestUpdateMetadata, *utf::precondition(if_reachable()))
+{
+  test_fixture f;
+
+  // upload an object
+  TH1F h1("object1", "object1", 100, 0, 99);
+  cout << "storing object 1 in " << basePath << "Test" << endl;
+  map<string, string> metadata;
+  metadata["custom"] = "whatever";
+  metadata["id"] = "first";
+  f.api.storeAsTFile(&h1, basePath + "Test", metadata);
+
+  // retrieve the headers just to be sure
+  std::map<std::string, std::string> headers = f.api.retrieveHeaders(basePath + "Test", metadata);
+  BOOST_CHECK(headers.count("custom") > 0);
+  BOOST_CHECK(headers.at("custom") == "whatever");
+  string firstID = headers.at("ETag");
+  firstID.erase(std::remove(firstID.begin(), firstID.end(), '"'), firstID.end());
+
+  map<string, string> newMetadata;
+  newMetadata["custom"] = "somethingelse";
+
+  // update the metadata and check
+  f.api.updateMetadata(basePath + "Test", newMetadata, o2::ccdb::getCurrentTimestamp());
+  headers = f.api.retrieveHeaders(basePath + "Test", newMetadata);
+  BOOST_CHECK(headers.count("custom") > 0);
+  BOOST_CHECK(headers.at("custom") == "somethingelse");
+
+  // add a second object
+  cout << "storing object 2 in " << basePath << "Test" << endl;
+  metadata.clear();
+  metadata["custom"] = "whatever";
+  metadata["id"] = "second";
+  f.api.storeAsTFile(&h1, basePath + "Test", metadata);
+
+  // get id
+  cout << "get id" << endl;
+  headers = f.api.retrieveHeaders(basePath + "Test", metadata);
+  string secondID = headers.at("ETag");
+  secondID.erase(std::remove(secondID.begin(), secondID.end(), '"'), secondID.end());
+
+  // update the metadata by id
+  cout << "update the metadata by id" << endl;
+  newMetadata.clear();
+  newMetadata["custom"] = "first";
+  f.api.updateMetadata(basePath + "Test", newMetadata, o2::ccdb::getCurrentTimestamp(), firstID);
+  newMetadata.clear();
+  newMetadata["custom"] = "second";
+  f.api.updateMetadata(basePath + "Test", newMetadata, o2::ccdb::getCurrentTimestamp(), secondID);
+
+  // check
+  metadata.clear();
+  metadata["id"] = "first";
+  headers = f.api.retrieveHeaders(basePath + "Test", metadata);
+  BOOST_CHECK(headers.count("custom") > 0);
+  BOOST_CHECK(headers.at("custom") == "first");
+  metadata.clear();
+  metadata["id"] = "second";
+  headers = f.api.retrieveHeaders(basePath + "Test", metadata);
+  BOOST_CHECK(headers.count("custom") > 0);
+  BOOST_CHECK(headers.at("custom") == "second");
+}