Add interface for finding gate hooks by class name

core/bessctl.cc

@@ -127,7 +127,7 @@ static Status enable_hook_for_module(ConfigureGateHookResponse* response,
     return Status::OK;
   }
 
-  //FIXME This operation is not all or nothing
+  //XXX this codes is not all or nothing if a gatehook command are failed
   if (is_igate) {
     for (auto& gate : m->igates()) {
       if (!gate) {
@@ -195,7 +195,7 @@ static int collect_igates(Module* m, GetModuleInfoResponse* response) {
 
     GetModuleInfoResponse_IGate* igate = response->add_igates();
 
-    Track* t = reinterpret_cast<Track*>(g->FindHook(Track::kName));
+    Track* t = reinterpret_cast<Track*>(g->FindHookByClass(Track::kName));
 
     if (t) {
       igate->set_cnt(t->cnt());
@@ -231,7 +231,7 @@ static int collect_ogates(Module* m, GetModuleInfoResponse* response) {
     GetModuleInfoResponse_OGate* ogate = response->add_ogates();
 
     ogate->set_ogate(g->gate_idx());
-    Track* t = reinterpret_cast<Track*>(g->FindHook(Track::kName));
+    Track* t = reinterpret_cast<Track*>(g->FindHookByClass(Track::kName));
     if (t) {
       ogate->set_cnt(t->cnt());
       ogate->set_pkts(t->pkts());
@@ -1498,7 +1498,6 @@ class BESSControlImpl final : public BESSControl::Service {
                                request->hook().class_name().c_str());
     }
 
-    //XXX this codes isf not all or nothing if a gatehook command are failed
     if (request->hook().module_name().length() == 0) {
       // Install this hook on all modules
       for (const auto& it : ModuleGraph::GetAllModules()) {

core/gate.cc

@@ -30,6 +30,7 @@
 
 #include "gate.h"
 #include "gate_hooks/track.h"
+#include "utils/format.h"
 
 #include <algorithm>
 #include <map>
@@ -125,9 +126,10 @@ GateHook *Gate::CreateGateHook(const GateHookBuilder *builder, Gate *gate,
 int Gate::AddHook(GateHook *hook, pb_error_t *error) {
   for (const auto &h : hooks_) {
     if (h->name() == hook->name()) {
-      *error = pb_errno(EEXIST);
+      error->set_code(EEXIST);
+      error->set_errmsg("Fail to Add Hook");
+      return -1;
     }
-    return -1;
   }
 
   hooks_.push_back(hook);
@@ -160,6 +162,27 @@ void Gate::RemoveHook(const std::string &name) {
   }
 }
 
+GateHook *Gate::FindHookByClass(const std::string &class_name) {
+  for (const auto &hook : hooks_) {
+    if (hook->class_name() == class_name) {
+      return hook;
+    }
+  }
+  return nullptr;
+}
+
+void Gate::RemoveHookByClass(const std::string &class_name) {
+  for (auto it = hooks_.begin(); it != hooks_.end(); ++it) {
+    GateHook *hook = *it;
+    if (hook->class_name() == class_name) {
+      delete hook;
+      hooks_.erase(it);
+      return;
+    }
+  }
+}
+
+
 // TODO(torek): combine (template) with ModuleBuilder::RunCommand
 CommandResponse GateHookBuilder::RunCommand(
     GateHook *hook, const std::string &user_cmd,

core/gate.h

@@ -219,6 +219,10 @@ class Gate {
 
   void RemoveHook(const std::string &name);
 
+  GateHook *FindHookByClass(const std::string &name);
+
+  void RemoveHookByClass(const std::string &name);
+
   void ClearHooks();
 
  protected: