src/ipc/Strand.cc

   1 /*
   2  * $Id$
   3  *
   4  * DEBUG: section 54    Interprocess Communication
   5  *
   6  */
   7
   8 #include "config.h"
   9 #include "base/TextException.h"
  10 #include "ipc/Strand.h"
  11 #include "ipc/StrandCoord.h"
  12 #include "ipc/Messages.h"
  13 #include "ipc/SharedListen.h"
  14 #include "ipc/Kids.h"
  15 #include "mgr/Request.h"
  16 #include "mgr/Response.h"
  17 #include "mgr/Forwarder.h"
  18 #include "DiskIO/IpcIo/IpcIoFile.h" /* XXX: scope boundary violation */
  19 #include "SwapDir.h" /* XXX: scope boundary violation */
  20 #include "CacheManager.h"
  21
  22
  23 CBDATA_NAMESPACED_CLASS_INIT(Ipc, Strand);
  24
  25
  26 Ipc::Strand::Strand():
  27         Port(MakeAddr(strandAddrPfx, KidIdentifier)),
  28         isRegistered(false)
  29 {
  30 }
  31
  32 void Ipc::Strand::start()
  33 {
  34     Port::start();
  35     registerSelf();
  36 }
  37
  38 void Ipc::Strand::registerSelf()
  39 {
  40     debugs(54, 6, HERE);
  41     Must(!isRegistered);
  42
  43     HereIamMessage ann(StrandCoord(KidIdentifier, getpid()));
  44     TypedMsgHdr message;
  45     ann.pack(message);
  46     SendMessage(coordinatorAddr, message);
  47     setTimeout(6, "Ipc::Strand::timeoutHandler"); // TODO: make 6 configurable?
  48 }
  49
  50 void Ipc::Strand::receive(const TypedMsgHdr &message)
  51 {
  52     debugs(54, 6, HERE << message.type());
  53     switch (message.type()) {
  54
  55     case mtRegistration:
  56         handleRegistrationResponse(HereIamMessage(message));
  57         break;
  58
  59     case mtSharedListenResponse:
  60         SharedListenJoined(SharedListenResponse(message));
  61         break;
  62
  63     case mtIpcIoRequest:
  64         IpcIoFile::HandleRequest(IpcIoRequest(message));
  65         break;
  66
  67     case mtIpcIoResponse:
  68         IpcIoFile::HandleResponse(message);
  69         break;
  70
  71     case mtCacheMgrRequest:
  72         handleCacheMgrRequest(Mgr::Request(message));
  73         break;
  74
  75     case mtCacheMgrResponse:
  76         handleCacheMgrResponse(Mgr::Response(message));
  77         break;
  78
  79     default:
  80         debugs(54, 1, HERE << "Unhandled message type: " << message.type());
  81         break;
  82     }
  83 }
  84
  85 void Ipc::Strand::handleRegistrationResponse(const HereIamMessage &msg)
  86 {
  87     // handle registration response from the coordinator; it could be stale
  88     if (msg.strand.kidId == KidIdentifier && msg.strand.pid == getpid()) {
  89         debugs(54, 6, "kid" << KidIdentifier << " registered");
  90         clearTimeout(); // we are done
  91     } else {
  92         // could be an ACK to the registration message of our dead predecessor
  93         debugs(54, 6, "kid" << KidIdentifier << " is not yet registered");
  94         // keep listening, with a timeout
  95     }
  96 }
  97
  98 void Ipc::Strand::handleCacheMgrRequest(const Mgr::Request& request)
  99 {
 100     Mgr::Action::Pointer action =
 101         CacheManager::GetInstance()->createRequestedAction(request.params);
 102     action->respond(request);
 103 }
 104
 105 void Ipc::Strand::handleCacheMgrResponse(const Mgr::Response& response)
 106 {
 107     Mgr::Forwarder::HandleRemoteAck(response.requestId);
 108 }
 109
 110 void Ipc::Strand::timedout()
 111 {
 112     debugs(54, 6, HERE << isRegistered);
 113     if (!isRegistered)
 114         fatalf("kid%d registration timed out", KidIdentifier);
 115 }