Added a basic implementation to receive filtered documents in the cluster. Right now it does not yet filter and is inefficent but serves the API

arangod/Cluster/ClusterMethods.cpp

@@ -982,6 +982,54 @@ int getDocumentOnCoordinator (
                                // the DBserver could have reported an error.
 }
 
+////////////////////////////////////////////////////////////////////////////////
+/// @brief get a list of filtered documents in a coordinator
+///        All found documents will be inserted into result.
+///        After execution the documentIds will contain only all those
+///        ids that could not be found.
+////////////////////////////////////////////////////////////////////////////////
+
+int getFilteredDocumentsOnCoordinator (
+             std::string const& dbname,
+             std::vector<traverser::TraverserExpression*> const& expressions, 
+             std::map<std::string, std::string> const& headers,
+             std::unordered_set<std::string>& documentIds,
+             std::unordered_map<std::string, TRI_json_t*>& result) {
+
+  // TODO Proper implementation
+  for (auto it = documentIds.begin(); it != documentIds.end(); /* noop */) {
+    triagens::rest::HttpResponse::HttpResponseCode responseCode;
+    std::map<std::string, std::string> resultHeaders;
+    std::vector<std::string> splitId = triagens::basics::StringUtils::split(*it, '/'); 
+    TRI_ASSERT(splitId.size() == 2);
+    std::string vertexResult;
+    int res = getDocumentOnCoordinator(dbname,
+                                       splitId[0],
+                                       splitId[1],
+                                       0,
+                                       headers,
+                                       true,
+                                       responseCode,
+                                       resultHeaders,
+                                       vertexResult);
+    if (res != TRI_ERROR_NO_ERROR) {
+      return res;
+    }
+    if (responseCode == triagens::rest::HttpResponse::HttpResponseCode::NOT_FOUND) {
+      result.emplace(*it, nullptr);
+      ++it;
+    }
+    else {
+      result.emplace(*it, triagens::basics::JsonHelper::fromString(vertexResult));
+      documentIds.erase(it++);
+    }
+  }
+  return TRI_ERROR_NO_ERROR;
+}
+
+
+
+
 ////////////////////////////////////////////////////////////////////////////////
 /// @brief get all documents in a coordinator
 ////////////////////////////////////////////////////////////////////////////////
@@ -1140,11 +1188,16 @@ int getFilteredEdgesOnCoordinator (
   }
   for (it = shards.begin(); it != shards.end(); ++it) {
     map<string, string>* headers = new map<string, string>;
-
+    res = cc->asyncRequest("", coordTransactionID, "shard:" + it->first,
+                           triagens::rest::HttpRequest::HTTP_REQUEST_GET,
+                           "/_db/" + StringUtils::urlEncode(dbname) + "/_api/edges/" + it->first + queryParameters,
+                           0, false, headers, nullptr, 3600.0);
+/*
     res = cc->asyncRequest("", coordTransactionID, "shard:" + it->first,
                            triagens::rest::HttpRequest::HTTP_REQUEST_PUT,
                            "/_db/" + StringUtils::urlEncode(dbname) + "/_api/edges/" + it->first + queryParameters,
                            &reqBodyString, false, headers, nullptr, 3600.0);
+                           */
     delete res;
   }
   // Now listen to the results:

arangod/Cluster/ClusterMethods.h

@@ -160,6 +160,20 @@ namespace triagens {
                  std::map<std::string, std::string>& resultHeaders,
                  std::string& resultBody);
 
+////////////////////////////////////////////////////////////////////////////////
+/// @brief get a list of filtered documents in a coordinator
+///        All found documents will be inserted into result.
+///        After execution the documentIds will contain only all those
+///        ids that could not be found.
+////////////////////////////////////////////////////////////////////////////////
+
+    int getFilteredDocumentsOnCoordinator (
+                 std::string const& dbname,
+                 std::vector<traverser::TraverserExpression*> const& expressions, 
+                 std::map<std::string, std::string> const& headers,
+                 std::unordered_set<std::string>& documentIds,
+                 std::unordered_map<std::string, TRI_json_t*>& result);
+
 ////////////////////////////////////////////////////////////////////////////////
 /// @brief get all documents in a coordinator
 ////////////////////////////////////////////////////////////////////////////////
@@ -198,7 +212,7 @@ namespace triagens {
                  std::vector<traverser::TraverserExpression*> const& expressions, 
                  triagens::rest::HttpResponse::HttpResponseCode& responseCode,
                  std::string& contentType,
-                 triagens::basics::Json& resultBody);
+                 triagens::basics::Json& resultJson);
 
 ////////////////////////////////////////////////////////////////////////////////
 /// @brief modify a document in a coordinator

arangod/Cluster/ClusterTraverser.cpp

@@ -100,17 +100,17 @@ void ClusterTraverser::EdgeGetter::operator() (std::string const& startVertex,
     triagens::rest::HttpResponse::HttpResponseCode responseCode;
     std::string contentType;
     std::string collName = _traverser->_edgeCols[eColIdx];
-    std::vector<TraverserExpression*> expTmp;
+    std::vector<TraverserExpression*> expEdges;
     auto found = _traverser->_expressions->find(depth);
     if (found != _traverser->_expressions->end()) {
-      expTmp = found->second;
+      expEdges = found->second;
     }
 
     int res = getFilteredEdgesOnCoordinator(_traverser->_dbname,
                                             collName,
                                             startVertex,
                                             _traverser->_opts.direction,
-                                            expTmp,
+                                            expEdges,
                                             responseCode,
                                             contentType,
                                             resultEdges);
@@ -141,25 +141,21 @@ void ClusterTraverser::EdgeGetter::operator() (std::string const& startVertex,
       }
       _traverser->_edges.emplace(edgeId, edge.copy().steal());
     }
+
+    std::vector<TraverserExpression*> expVertices;
+    found = _traverser->_expressions->find(depth + 1);
+    if (found != _traverser->_expressions->end()) {
+      expVertices = found->second;
+    }
+
     std::map<std::string, std::string> headers;
-    std::map<std::string, std::string> resultHeaders;
-    for (auto it : verticesToFetch) {
-      std::vector<std::string> splitId = triagens::basics::StringUtils::split(it, '/'); 
-      TRI_ASSERT(splitId.size() == 2);
-      std::string vertexResult;
-      int res = getDocumentOnCoordinator(_traverser->_dbname,
-                                         splitId[0],
-                                         splitId[1],
-                                         0,
-                                         headers,
-                                         true,
-                                         responseCode,
-                                         resultHeaders,
-                                         vertexResult);
-      if (res != TRI_ERROR_NO_ERROR) {
-        THROW_ARANGO_EXCEPTION(res);
-      }
-      _traverser->_vertices.emplace(it, triagens::basics::JsonHelper::fromString(vertexResult));
+    res = getFilteredDocumentsOnCoordinator(_traverser->_dbname,
+                                            expVertices,
+                                            headers,
+                                            verticesToFetch,
+                                            _traverser->_vertices);
+    if (res != TRI_ERROR_NO_ERROR) {
+      THROW_ARANGO_EXCEPTION(res);
     }
     std::string next = stack.top();
     stack.pop();