From b3500464277cc02c202a798ac2ff166cfc7d63a4 Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@gmail.com>
Date: Mon, 14 Dec 2015 14:14:45 -0500
Subject: [PATCH] todo: udprepeat

---
 src/utils/udprepeat.cpp | 172 ++++++++++++++++++++++++++++++++++++++++
 src/utils/udprepeat.h   |  54 +++++++++++++
 2 files changed, 226 insertions(+)
 create mode 100644 src/utils/udprepeat.cpp
 create mode 100644 src/utils/udprepeat.h

diff --git a/src/utils/udprepeat.cpp b/src/utils/udprepeat.cpp
new file mode 100644
index 0000000..5c4f3d8
--- /dev/null
+++ b/src/utils/udprepeat.cpp
@@ -0,0 +1,172 @@
+
+#include <map>
+#include <memory>
+
+#include <epicsGuard.h>
+#include <fdManager.h>
+
+#include <pv/thread.h>
+
+#include "udprepeat.h"
+
+namespace pvd = epics::pvData;
+namespace pva = epics::pvAccess;
+
+typedef epicsGuard<epicsMutex> Guard;
+typedef epicsGuardRelease<epicsMutex> UnGuard;
+
+namespace {
+static epicsMutex repeatlistlock;
+typedef std::map<unsigned short, UDPFanout::weak_pointer> repeaters_t;
+static repeaters_t repeaters;
+
+struct Receiver : public pvd::Runnable
+{
+    const SOCKET sock;
+    pva::UDPFanout::Pvt * const pvt;
+    std::vector<char> buf;
+    std::vector<std::tr1::shared_ptr<pva::UDPReceiver> > recvs;
+    bool run;
+    pvd::Thread runner;
+    epicsEvent evt;
+
+    Receiver(SOCKET sock, const std::string& name, pva::UDPFanout::Pvt *pvt)
+        :sock(sock), pvt(pvt), buf(8196), run(true)
+        ,runner(pvd::Thread::Config(this)
+                .name(name)
+                .prio(epicsThreadPriorityCAServerLow-2))
+    {
+        evt.wait();
+    }
+    ~Receiver()
+    {
+        epicsSocketDestroy(sock);
+    }
+    virtual void run()
+    {
+        evt.signal();
+        Guard G(pvt->lock);
+        while(run) {
+            ssize_t ret;
+            {
+                UnGuard U(G);
+                ret = ::recv(sock, &buf[0], buf.size(), 0);
+            }
+            if(ret<0) {
+                int err = errno;
+
+            }
+        }
+    }
+    void shutdown();
+};
+
+}
+
+namespace epics {namespace pvAccess {
+
+struct UDPFanout::Pvt
+{
+    const unsigned port;
+    epicsMutex lock;
+
+    UDPFanout::addr_list iface, bcase;
+    UDPFanout::name_list names;
+
+    Pvt(unsigned port)
+        :port(port)
+    {
+
+    }
+};
+
+}} // namespace
+
+namespace {
+
+void Receiver::shutdown()
+{
+    {
+        Guard G(pvt->lock);
+        run = false;
+    }
+    switch(epicsSocketSystemCallInterruptMechanismQuery())
+    {
+    case esscimqi_socketBothShutdownRequired:
+        ::shutdown(sock, SHUT_RDWR);
+        break;
+    default:
+        break;
+    }
+    runner.exitWait();
+}
+
+}
+
+namespace epics {namespace pvAccess {
+
+
+UDPFanout::~UDPFanout()
+{
+    std::auto_ptr<UDPFanout::Pvt> pvt(this->pvt);
+
+    epicsGuard<epicsMutex> G(repeatlistlock);
+
+    repeaters_t::iterator it = repeaters.find(pvt->port);
+    if(it!=repeaters.end()) {
+        UDPFanout::shared_pointer self(it->second.lock());
+        if(self && self.get()==this)
+            repeaters.erase(it);
+    }
+}
+
+void
+UDPFanout::bind(const UDPReceiver::shared_pointer, const std::string& iname)
+{
+
+}
+
+void
+UDPFanout::bind(const UDPReceiver::shared_pointer, const osiSockAddr& iface)
+{
+
+}
+
+void
+UDPFanout::unbind(const UDPReceiver::shared_pointer)
+{
+
+}
+
+const UDPFanout::name_list&
+UDPFanout::getNames()
+{
+
+}
+
+const UDPFanout::addr_list&
+UDPFanout::getAddresses()
+{
+
+}
+
+UDPFanout::shared_pointer
+UDPFanout::getFanoutPort(unsigned port)
+{
+    epicsGuard<epicsMutex> G(repeatlistlock);
+
+    repeaters_t::const_iterator it = repeaters.find(port);
+    if(it!=repeaters.end()) {
+        UDPFanout::shared_pointer R(it->second.lock());
+        if(R)
+            return R;
+    }
+
+    std::auto_ptr<UDPFanout::Pvt> pvt(new UDPFanout::Pvt(port));
+    UDPFanout::shared_pointer ret(new UDPFanout(pvt.get()));
+    repeaters[port] = ret;
+    pvt.release();
+    return ret;
+}
+
+}} // namespace
diff --git a/src/utils/udprepeat.h b/src/utils/udprepeat.h
new file mode 100644
index 0000000..eb9aabe
--- /dev/null
+++ b/src/utils/udprepeat.h
@@ -0,0 +1,54 @@
+#ifndef UDPREPEAT_H
+#define UDPREPEAT_H
+
+#include <vector>
+#include <string>
+
+#include <osiSock.h>
+
+#include "byteBuffer.h"
+#include "sharedPtr.h"
+
+#define epicsExportSharedSymbols
+
+namespace epics {namespace pvAccess {
+
+class UDPReceiver
+{
+    POINTER_DEFINITIONS(UDPReceiver);
+
+    virtual ~UDPReceiver() {}
+
+    virtual void recv(const osiSockAddr& src,
+                      const char *buf, size_t buflen) =0;
+};
+
+class UDPFanout
+{
+    struct Pvt;
+    friend struct Pvt;
+    Pvt *pvt;
+    UDPFanout(Pvt *pvt) :pvt(pvt) {}
+    UDPFanout(const UDPFanout&);
+    UDPFanout& operator=(const UDPFanout&);
+public:
+    POINTER_DEFINITIONS(UDPFanout);
+
+    ~UDPFanout();
+
+    void bind(const UDPReceiver::shared_pointer, const std::string& iname);
+    void bind(const UDPReceiver::shared_pointer, const osiSockAddr& iface);
+    void unbind(const UDPReceiver::shared_pointer);
+
+    typedef std::vector<std::string> name_list;
+    typedef std::vector<osiSockAddr> addr_list;
+
+    const name_list& getNames();
+    const addr_list& getAddresses();
+
+    static UDPFanout::shared_pointer getFanoutPort(unsigned port);
+};
+
+}}
+
+#endif // UDPREPEAT_H