Bug fix/less exceptions (#7385) (#7415)

arangod/Aql/AqlFunctionFeature.cpp

@@ -119,6 +119,12 @@ void AqlFunctionFeature::toVelocyPack(VPackBuilder& builder) {
   builder.close();
 }
 
+bool AqlFunctionFeature::exists(std::string const& name) const {
+  auto it = _functionNames.find(name);
+
+  return it != _functionNames.end();
+}
+
 Function const* AqlFunctionFeature::byName(std::string const& name) {
   auto it = _functionNames.find(name);
 

arangod/Aql/AqlFunctionFeature.h

@@ -57,6 +57,8 @@ class AqlFunctionFeature final : public application_features::ApplicationFeature
   void toVelocyPack(arangodb::velocypack::Builder&);
   Function const* byName(std::string const& name);
 
+  bool exists(std::string const& name) const;
+
  private:
   // Internal functions
   void addTypeCheckFunctions();

arangod/Cluster/ServerState.cpp

@@ -90,17 +90,19 @@ void ServerState::findHost(std::string const& fallback) {
 
   // Now look at the contents of the file /etc/machine-id, if it exists:
   std::string name = "/etc/machine-id";
-  try {
-    _host = arangodb::basics::FileUtils::slurp(name);
-    while (!_host.empty() &&
-           (_host.back() == '\r' || _host.back() == '\n' ||
-            _host.back() == ' ')) {
-      _host.erase(_host.size() - 1);
-    }
-    if (!_host.empty()) {
-      return;
-    }
-  } catch (...) { }
+  if (arangodb::basics::FileUtils::exists(name)) {
+    try {
+      _host = arangodb::basics::FileUtils::slurp(name);
+      while (!_host.empty() &&
+             (_host.back() == '\r' || _host.back() == '\n' ||
+              _host.back() == ' ')) {
+        _host.erase(_host.size() - 1);
+      }
+      if (!_host.empty()) {
+        return;
+      }
+    } catch (...) { }
+  }
 
 #ifdef __APPLE__
   static_assert(sizeof(uuid_t) == 16, "");

arangod/IResearch/ApplicationServerHelper.cpp

@@ -35,7 +35,7 @@ bool addFunction(
 ) {
   // check that a function by the given name is not registred to avoid
   // triggering an assert inside AqlFunctionFeature::add(...)
-  if (getFunction(functions, function.name)) {
+  if (functions.exists(function.name)) {
     return false;
   }