Callback-basierte SystemBackends f?r h?here Flexibilit?t

11 files changed, 157 insertions, 117 deletions

diff --git a/Konzept/Konzept.txt b/Konzept/Konzept.txt
index ad5525d..a51e0e6 100644
--- a/Konzept/Konzept.txt
+++ b/Konzept/Konzept.txt
@@ -22,14 +22,14 @@ Funktionen der Teile:
 
 2. Dämon
 * Verbindung zum Server zum Empfang von Befehlen (implementiert)
-* Rechnerverwaltung
+* Rechnerverwaltung (teilweise implementiert)
  - Herunterfahren, neustarten (implementiert)
 * Bereitstellung von Statusinformationen (teilweise implementiert)
  - Prozessorlast, uptime (implementiert)
  - Speicherauslastung (implementiert)
  - aktuelle Benutzer
  - Prozessliste
-* Weitergabe von Logdaten
+* Weitergabe von Logdaten (implementiert)
 
 3. Client
 * Bereitstellung aller Funktionen
diff --git a/src/Common/Backends/SystemBackendPosix.cpp b/src/Common/Backends/SystemBackendPosix.cpp
index b1e088d..3ddf67d 100644
--- a/src/Common/Backends/SystemBackendPosix.cpp
+++ b/src/Common/Backends/SystemBackendPosix.cpp
@@ -69,7 +69,7 @@ void SystemBackendPosix::childHandler(int) {
   setChildHandler();
 }
 
-bool SystemBackendPosix::exec(sigc::slot<void, int> resultHandler, const std::string &filename, const std::vector<std::string> &argv, const std::vector<std::string> &env) {
+bool SystemBackendPosix::exec(const sigc::slot<void, int>& resultHandler, const std::string &filename, const std::vector<std::string> &argv, const std::vector<std::string> &env) {
   pid_t pid;
   char **argvp, **envp;
 
diff --git a/src/Common/Backends/SystemBackendPosix.h b/src/Common/Backends/SystemBackendPosix.h
index 9efd59f..4a2c572 100644
--- a/src/Common/Backends/SystemBackendPosix.h
+++ b/src/Common/Backends/SystemBackendPosix.h
@@ -28,6 +28,7 @@
 
 #include <sys/types.h>
 #include <sigc++/signal.h>
+#include <sigc++/hide.h>
 
 namespace Mad {
 namespace Common {
@@ -47,8 +48,8 @@ class SystemBackendPosix : public SystemBackend {
     }
 
   protected:
-    virtual bool doShutdown() {return exec(sigc::slot<void, int>(), "/sbin/halt");}
-    virtual bool doReboot() {return exec(sigc::slot<void, int>(), "/sbin/reboot");}
+    virtual bool doShutdown(const sigc::slot<void> &callback) {return exec(sigc::hide(callback), "/sbin/halt");}
+    virtual bool doReboot(const sigc::slot<void> &callback) {return exec(sigc::hide(callback), "/sbin/reboot");}
 
   public:
     ~SystemBackendPosix();
@@ -61,7 +62,7 @@ class SystemBackendPosix : public SystemBackend {
       SystemBackend::unregisterBackend(&backend);
     }
 
-    static bool exec(sigc::slot<void, int> resultHandler, const std::string &filename, const std::vector<std::string> &argv = std::vector<std::string>(),
+    static bool exec(const sigc::slot<void, int> &resultHandler, const std::string &filename, const std::vector<std::string> &argv = std::vector<std::string>(),
         const std::vector<std::string> &env = std::vector<std::string>());
 };
 
diff --git a/src/Common/Backends/SystemBackendProc.cpp b/src/Common/Backends/SystemBackendProc.cpp
index 37bfaf3..134998f 100644
--- a/src/Common/Backends/SystemBackendProc.cpp
+++ b/src/Common/Backends/SystemBackendProc.cpp
@@ -28,37 +28,37 @@ namespace Backends {
 
 SystemBackendProc SystemBackendProc::backend;
 
-SystemBackend::UptimeInfo SystemBackendProc::uptimeInfo() {
-  UptimeInfo uptime = {0, 0};
+bool SystemBackendProc::uptimeInfo(const sigc::slot<void, unsigned long, unsigned long> &callback) {
+  unsigned long uptime = 0, idleTime = 0;
 
   uptimeFile.seekg(0, std::ios::beg);
 
   if(!uptimeFile.good())
-    return uptime;
+    return false;
 
   float f;
   uptimeFile >> f;
   if(!uptimeFile.good())
-    return uptime;
+    return false;
 
-  uptime.uptime = (unsigned long)f;
+  uptime = (unsigned long)f;
 
   uptimeFile >> f;
-  if(!uptimeFile.good())
-    return uptime;
+  if(uptimeFile.good())
+    idleTime = (unsigned long)f;
 
-  uptime.idleTime = (unsigned long)f;
+  callback(uptime, idleTime);
 
-  return uptime;
+  return true;
 }
 
-SystemBackend::MemoryInfo SystemBackendProc::memoryInfo() {
-  MemoryInfo memInfo = {0, 0, 0, 0};
+bool SystemBackendProc::memoryInfo(const sigc::slot<void, unsigned long, unsigned long, unsigned long, unsigned long> &callback) {
+  unsigned long totalMem = 0, freeMem = 0, totalSwap = 0, freeSwap = 0;
 
   meminfoFile.seekg(0, std::ios::beg);
 
   if(!meminfoFile.good())
-    return memInfo;
+    return false;
 
   while(!meminfoFile.eof() && meminfoFile.good()) {
     std::string line;
@@ -69,42 +69,46 @@ SystemBackend::MemoryInfo SystemBackendProc::memoryInfo() {
 
     if(std::sscanf(line.c_str(), "%s %lu", name, &value) == 2) {
       if(std::strcmp(name, "MemTotal:") == 0)
-        memInfo.totalMem = value;
+        totalMem = value;
       else if(std::strcmp(name, "MemFree:") == 0)
-        memInfo.freeMem = value;
+        freeMem = value;
       else if(std::strcmp(name, "SwapTotal:") == 0)
-        memInfo.totalSwap = value;
+        totalSwap = value;
       else if(std::strcmp(name, "SwapFree:") == 0)
-        memInfo.freeSwap = value;
+        freeSwap = value;
     }
 
     delete [] name;
 
-    if(memInfo.totalMem && memInfo.freeMem && memInfo.totalSwap && memInfo.freeSwap)
+    if(totalMem && freeMem && totalSwap && freeSwap)
       break;
   }
 
+  callback(totalMem, freeMem, totalSwap, freeSwap);
 
-  return memInfo;
+  return true;
 }
 
-SystemBackend::LoadInfo SystemBackendProc::loadInfo() {
-  LoadInfo loadInfo = {0, 0, 0, 0, 0};
+bool SystemBackendProc::loadInfo(const sigc::slot<void, unsigned long, unsigned long, float, float, float> &callback) {
+  unsigned long currentLoad = 0, nProcesses = 0;
+  float loadAvg1 = 0, loadAvg5 = 0, loadAvg15 = 0;
 
   loadFile.seekg(0, std::ios::beg);
 
   if(!loadFile.good())
-    return loadInfo;
+    return false;
 
   std::string line;
   std::getline(loadFile, line);
 
   if(line.empty())
-    return loadInfo;
+    return false;
+
+  std::sscanf(line.c_str(), "%f %f %f %lu/%lu", &loadAvg1, &loadAvg5, &loadAvg15, &currentLoad, &nProcesses);
 
-  std::sscanf(line.c_str(), "%f %f %f %lu/%lu", &loadInfo.loadAvg1, &loadInfo.loadAvg5, &loadInfo.loadAvg15, &loadInfo.currentLoad, &loadInfo.nProcesses);
+  callback(currentLoad, nProcesses, loadAvg1, loadAvg5, loadAvg15);
 
-  return loadInfo;
+  return true;
 }
 
 }
diff --git a/src/Common/Backends/SystemBackendProc.h b/src/Common/Backends/SystemBackendProc.h
index 619c996..79ff6c5 100644
--- a/src/Common/Backends/SystemBackendProc.h
+++ b/src/Common/Backends/SystemBackendProc.h
@@ -47,9 +47,9 @@ class SystemBackendProc : public SystemBackend {
       SystemBackend::unregisterBackend(&backend);
     }
 
-    virtual UptimeInfo uptimeInfo();
-    virtual MemoryInfo memoryInfo();
-    virtual LoadInfo loadInfo();
+    virtual bool uptimeInfo(const sigc::slot<void, unsigned long, unsigned long> &callback);
+    virtual bool memoryInfo(const sigc::slot<void, unsigned long, unsigned long, unsigned long, unsigned long> &callback);
+    virtual bool loadInfo(const sigc::slot<void, unsigned long, unsigned long, float, float, float> &callback);
 };
 
 }
diff --git a/src/Common/RequestHandlers/StatusRequestHandler.cpp b/src/Common/RequestHandlers/StatusRequestHandler.cpp
index dbdf9e1..8494fee 100644
--- a/src/Common/RequestHandlers/StatusRequestHandler.cpp
+++ b/src/Common/RequestHandlers/StatusRequestHandler.cpp
@@ -28,10 +28,10 @@ namespace Mad {
 namespace Common {
 namespace RequestHandlers {
 
-void StatusRequestHandler::handlePacket(Net::Connection *connection, const Net::Packet &packet) {
+void StatusRequestHandler::handlePacket(Net::Connection *con, const Net::Packet &packet) {
   if(packet.getType() != Net::Packet::STATUS) {
     Logger::log(Logger::ERROR, "Received an unexpected packet.");
-    connection->send(Net::Packets::ErrorPacket(Net::Packet::ERROR, packet.getRequestId(), Exception(Exception::UNEXPECTED_PACKET)));
+    con->send(Net::Packets::ErrorPacket(Net::Packet::ERROR, packet.getRequestId(), Exception(Exception::UNEXPECTED_PACKET)));
 
     signalFinished().emit();
     return;
@@ -39,12 +39,27 @@ void StatusRequestHandler::handlePacket(Net::Connection *connection, const Net::
 
   // TODO Require authentication
 
-  SystemBackend::UptimeInfo uptimeInfo = SystemBackend::getUptimeInfo();
-  SystemBackend::MemoryInfo memInfo = SystemBackend::getMemoryInfo();
-  SystemBackend::LoadInfo loadInfo = SystemBackend::getLoadInfo();
+  connection = con;
+  requestId = packet.getRequestId();
 
-  connection->send(Net::Packets::HostStatusPacket(Net::Packet::OK, packet.getRequestId(), uptimeInfo.uptime, uptimeInfo.idleTime,
-      memInfo.totalMem, memInfo.freeMem, memInfo.totalSwap, memInfo.freeSwap, loadInfo.currentLoad, loadInfo.nProcesses, loadInfo.loadAvg1, loadInfo.loadAvg5, loadInfo.loadAvg15));
+  if(!SystemBackend::getUptimeInfo(sigc::mem_fun(this, &StatusRequestHandler::uptimeHandler)))
+    needUptime = false;
+  if(!SystemBackend::getMemoryInfo(sigc::mem_fun(this, &StatusRequestHandler::memoryHandler)))
+    needMemory = false;
+  if(!SystemBackend::getLoadInfo(sigc::mem_fun(this, &StatusRequestHandler::loadHandler)))
+    needLoad = false;
+
+  send();
+}
+
+void StatusRequestHandler::send() {
+  if(needUptime || needMemory || needLoad || sent)
+    return;
+
+  connection->send(Net::Packets::HostStatusPacket(Net::Packet::OK, requestId, uptime, idleTime,
+      totalMem, freeMem, totalSwap, freeSwap, currentLoad, nProcesses, loadAvg1, loadAvg5, loadAvg15));
+
+  sent = true;
 
   signalFinished().emit();
 }
diff --git a/src/Common/RequestHandlers/StatusRequestHandler.h b/src/Common/RequestHandlers/StatusRequestHandler.h
index c5dcbf7..fd907de 100644
--- a/src/Common/RequestHandlers/StatusRequestHandler.h
+++ b/src/Common/RequestHandlers/StatusRequestHandler.h
@@ -21,17 +21,51 @@
 #define MAD_COMMON_REQUESTHANDLERS_STATUSREQUESTHANDLER_H_
 
 #include "../RequestHandler.h"
+#include <stdint.h>
 
 namespace Mad {
 namespace Common {
 namespace RequestHandlers {
 
 class StatusRequestHandler : public RequestHandler {
+  private:
+    Net::Connection *connection;
+    uint16_t requestId;
+
+    bool needUptime, needMemory, needLoad, sent;
+
+    unsigned long uptime, idleTime;
+    unsigned long totalMem, freeMem, totalSwap, freeSwap;
+    unsigned long currentLoad, nProcesses;
+    float loadAvg1, loadAvg5, loadAvg15;
+
+    void uptimeHandler(unsigned long uptime0, unsigned long idleTime0) {
+      uptime = uptime0; idleTime = idleTime0;
+      needUptime = false;
+      send();
+    }
+
+    void memoryHandler(unsigned long totalMem0, unsigned long freeMem0, unsigned long totalSwap0, unsigned long freeSwap0) {
+      totalMem = totalMem0; freeMem = freeMem0; totalSwap = totalSwap0; freeSwap = freeSwap0;
+      needMemory = false;
+      send();
+    }
+
+    void loadHandler(unsigned long currentLoad0, unsigned long nProcesses0, float loadAvg10, float loadAvg50, float loadAvg150) {
+      currentLoad = currentLoad0; nProcesses = nProcesses0; loadAvg1 = loadAvg10; loadAvg5 = loadAvg50; loadAvg15 = loadAvg150;
+      needLoad = false;
+      send();
+    }
+
+    void send();
+
   protected:
     virtual void handlePacket(Net::Connection *connection, const Net::Packet &packet);
 
   public:
-    StatusRequestHandler() {}
+    StatusRequestHandler() : needUptime(true), needMemory(true), needLoad(true), sent(false),
+    uptime(0), idleTime(0), totalMem(0), freeMem(0), totalSwap(0), freeSwap(0),
+    currentLoad(0), nProcesses(0), loadAvg1(0), loadAvg5(0), loadAvg15(0) {}
 };
 
 }
diff --git a/src/Common/SystemBackend.cpp b/src/Common/SystemBackend.cpp
index c017356..06a2898 100644
--- a/src/Common/SystemBackend.cpp
+++ b/src/Common/SystemBackend.cpp
@@ -25,49 +25,49 @@ namespace Common {
 std::set<SystemBackend*, SystemBackend::Compare> SystemBackend::backends;
 
 
-SystemBackend::UptimeInfo SystemBackend::getUptimeInfo() {
-  UptimeInfo ret = {0, 0};
+bool SystemBackend::getUptimeInfo(const sigc::slot<void, unsigned long, unsigned long> &callback) {
+  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end(); ++backend) {
+    if((*backend)->uptimeInfo(callback))
+      return true;
+  }
 
-  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end() && ret.uptime == 0; ++backend)
-    ret = (*backend)->uptimeInfo();
-
-  return ret;
+  return false;
 }
 
-SystemBackend::MemoryInfo SystemBackend::getMemoryInfo() {
-  MemoryInfo ret = {0, 0, 0, 0};
-
-  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end() && ret.totalMem == 0; ++backend)
-    ret = (*backend)->memoryInfo();
+bool SystemBackend::getMemoryInfo(const sigc::slot<void, unsigned long, unsigned long, unsigned long, unsigned long> &callback) {
+  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end(); ++backend) {
+    if((*backend)->memoryInfo(callback))
+      return true;
+  }
 
-  return ret;
+  return false;
 }
 
-SystemBackend::LoadInfo SystemBackend::getLoadInfo() {
-  LoadInfo ret = {0, 0, 0, 0, 0};
-
-  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end() && ret.currentLoad == 0 && ret.loadAvg1 == 0 && ret.nProcesses == 0; ++backend)
-    ret = (*backend)->loadInfo();
+bool SystemBackend::getLoadInfo(const sigc::slot<void, unsigned long, unsigned long, float, float, float> &callback) {
+  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end(); ++backend) {
+    if((*backend)->loadInfo(callback))
+      return true;
+  }
 
-  return ret;
+  return false;
 }
 
-bool SystemBackend::shutdown() {
-  bool ret = false;
+bool SystemBackend::shutdown(const sigc::slot<void> &callback) {
+  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end(); ++backend) {
+    if((*backend)->doShutdown(callback))
+      return true;
+  }
 
-  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end() && !ret; ++backend)
-    ret = (*backend)->doShutdown();
-
-  return ret;
+  return false;
 }
 
-bool SystemBackend::reboot() {
-  bool ret = false;
-
-  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end() && !ret; ++backend)
-    ret = (*backend)->doReboot();
+bool SystemBackend::reboot(const sigc::slot<void> &callback) {
+  for(std::set<SystemBackend*>::iterator backend = backends.begin(); backend != backends.end(); ++backend) {
+    if((*backend)->doReboot(callback))
+      return true;
+  }
 
-  return ret;
+  return false;
 }
 
 }
diff --git a/src/Common/SystemBackend.h b/src/Common/SystemBackend.h
index d9506a9..c8eee69 100644
--- a/src/Common/SystemBackend.h
+++ b/src/Common/SystemBackend.h
@@ -21,32 +21,12 @@
 #define MAD_COMMON_SYSTEMBACKEND_H_
 
 #include <set>
+#include <sigc++/signal.h>
 
 namespace Mad {
 namespace Common {
 
 class SystemBackend {
-  public:
-    struct UptimeInfo {
-      unsigned long uptime;
-      unsigned long idleTime;
-    };
-
-    struct MemoryInfo {
-      unsigned long totalMem;
-      unsigned long freeMem;
-      unsigned long totalSwap;
-      unsigned long freeSwap;
-    };
-
-    struct LoadInfo {
-      unsigned long currentLoad;
-      unsigned long nProcesses;
-      float loadAvg1;
-      float loadAvg5;
-      float loadAvg15;
-    };
-
   private:
     struct Compare {
       bool operator() (const SystemBackend *b1, const SystemBackend *b2) {
@@ -70,23 +50,20 @@ class SystemBackend {
       backends.erase(backend);
     }
 
-    virtual UptimeInfo uptimeInfo() {
-      UptimeInfo ret = {0, 0};
-      return ret;
+    virtual bool uptimeInfo(const sigc::slot<void, unsigned long, unsigned long>&) {
+      return false;
     }
 
-    virtual MemoryInfo memoryInfo() {
-      MemoryInfo ret = {0, 0, 0, 0};
-      return ret;
+    virtual bool memoryInfo(const sigc::slot<void, unsigned long, unsigned long, unsigned long, unsigned long>&) {
+      return false;
     }
 
-    virtual LoadInfo loadInfo() {
-      LoadInfo ret = {0, 0, 0, 0, 0};
-      return ret;
+    virtual bool loadInfo(const sigc::slot<void, unsigned long, unsigned long, float, float, float>&) {
+      return false;
     }
 
-    virtual bool doShutdown() {return false;}
-    virtual bool doReboot() {return false;}
+    virtual bool doShutdown(const sigc::slot<void>&) {return false;}
+    virtual bool doReboot(const sigc::slot<void>&) {return false;}
 
     virtual int getPriority() const {
       return 0;
@@ -95,12 +72,12 @@ class SystemBackend {
   public:
     virtual ~SystemBackend() {}
 
-    static UptimeInfo getUptimeInfo();
-    static MemoryInfo getMemoryInfo();
-    static LoadInfo getLoadInfo();
+    static bool getUptimeInfo(const sigc::slot<void, unsigned long, unsigned long> &callback);
+    static bool getMemoryInfo(const sigc::slot<void, unsigned long, unsigned long, unsigned long, unsigned long> &callback);
+    static bool getLoadInfo(const sigc::slot<void, unsigned long, unsigned long, float, float, float> &callback);
 
-    static bool shutdown();
-    static bool reboot();
+    static bool shutdown(const sigc::slot<void> &callback);
+    static bool reboot(const sigc::slot<void> &callback);
 };
 
 }
diff --git a/src/Daemon/RequestHandlers/CommandRequestHandler.cpp b/src/Daemon/RequestHandlers/CommandRequestHandler.cpp
index e49b0f5..c6750ba 100644
--- a/src/Daemon/RequestHandlers/CommandRequestHandler.cpp
+++ b/src/Daemon/RequestHandlers/CommandRequestHandler.cpp
@@ -24,6 +24,8 @@
 #include <Net/Connection.h>
 #include <Net/Packets/ErrorPacket.h>
 
+#include <sigc++/bind.h>
+
 namespace Mad {
 namespace Daemon {
 namespace RequestHandlers {
@@ -31,15 +33,17 @@ namespace RequestHandlers {
 void CommandRequestHandler::handlePacket(Net::Connection *connection, const Net::Packet &packet) {
   // TODO Require authentication
 
-  bool ret = false;
-
   switch(packet.getType()) {
     case Net::Packet::COMMAND_SHUTDOWN:
-      ret = Common::SystemBackend::shutdown();
+      if(Common::SystemBackend::shutdown(sigc::bind(sigc::mem_fun(this, &CommandRequestHandler::sendReply), connection, packet.getRequestId())))
+        return;
+
       break;
 
     case Net::Packet::COMMAND_REBOOT:
-      ret = Common::SystemBackend::reboot();
+      if(Common::SystemBackend::reboot(sigc::bind(sigc::mem_fun(this, &CommandRequestHandler::sendReply), connection, packet.getRequestId())))
+        return;
+
       break;
 
     default:
@@ -50,12 +54,13 @@ void CommandRequestHandler::handlePacket(Net::Connection *connection, const Net:
       return;
   }
 
-  if(ret)
-    connection->send(Net::Packet(Net::Packet::OK, packet.getRequestId()));
-  else {
-    connection->send(Net::Packets::ErrorPacket(Net::Packet::ERROR, packet.getRequestId(), Common::Exception(Common::Exception::NOT_IMPLEMENTED)));
-  }
+  connection->send(Net::Packets::ErrorPacket(Net::Packet::ERROR, packet.getRequestId(), Common::Exception(Common::Exception::NOT_IMPLEMENTED)));
+
+  signalFinished().emit();
+}
 
+void CommandRequestHandler::sendReply(Net::Connection *connection, uint16_t requestId) {
+  connection->send(Net::Packet(Net::Packet::OK, requestId));
   signalFinished().emit();
 }
 
diff --git a/src/Daemon/RequestHandlers/CommandRequestHandler.h b/src/Daemon/RequestHandlers/CommandRequestHandler.h
index cff6c10..5066c1d 100644
--- a/src/Daemon/RequestHandlers/CommandRequestHandler.h
+++ b/src/Daemon/RequestHandlers/CommandRequestHandler.h
@@ -21,12 +21,16 @@
 #define MAD_DAEMON_REQUESTHANDLERS_COMMANDREQUESTHANDLER_H_
 
 #include <Common/RequestHandler.h>
+#include <stdint.h>
 
 namespace Mad {
 namespace Daemon {
 namespace RequestHandlers {
 
 class CommandRequestHandler : public Common::RequestHandler {
+  private:
+    void sendReply(Net::Connection *connection, uint16_t requestId);
+
   protected:
     virtual void handlePacket(Net::Connection *connection, const Net::Packet &packet);