unfinished

[svn42.git] / go / r3-eventbroker_zmq / zeromq.go

diff --git a/go/r3-eventbroker_zmq/zeromq.go b/go/r3-eventbroker_zmq/zeromq.go
new file mode 100644 (file)
index 0000000..2e28d50
--- /dev/null
+++ b/go/r3-eventbroker_zmq/zeromq.go
@@ -0,0 +1,118 @@
+// (c) Bernhard Tittelbach, 2013
+
+package main
+
+import (
+    zmq "github.com/vaughan0/go-zmq"
+    "bytes"
+    "error"
+ )
+
+// ---------- ZeroMQ Code -------------
+
+type ReqSocket *zmq.Socket
+type PubSocket *zmq.Socket
+
+func ZmqsInit(sub_connect_port, sub_listen_port, pub_port, keylookup_port string)  (ctx *zmq.Context, sub_chans *zmq.Channels, pub_sock PubSocket, keylookup_sock ReqSocket) {
+    var err error
+    ctx, err = zmq.NewContext()
+    if err != nil {
+        panic(err)
+    }
+    //close only on later panic, otherwise leave open:
+    defer func(){ if r:= recover(); r != nil { ctx.Close(); panic(r) } }()
+
+    if len(sub_port) > 0 {
+        sub_sock, err := ctx.Socket(zmq.Sub)
+        if err != nil {
+            panic(err)
+        }
+        defer func() { if r:= recover(); r != nil { sub_sock.Close(); panic(r) } }()
+
+           if err = sub_sock.Bind(sub_listen_port); err != nil {
+            panic(err)
+        }
+
+           if err = sub_sock.Connect(sub_connect_port); err != nil {
+            panic(err)
+        }
+
+        sub_chans = sub_sock.ChannelsBuffer(10)
+        go zmqsHandleError(sub_chans)
+    } else {
+        sub_chans = nil
+    }
+
+    if len(pub_port) > 0 {
+        pub_sock, err := ctx.Socket(zmq.Pub)
+        if err != nil {
+            panic(err)
+        }
+        defer func() { if r:= recover(); r != nil { pub_sock.Close(); panic(r) } }()
+
+        if err = pub_sock.Bind(pub_port); err != nil {
+            panic(err)
+        }
+    } else {
+        pub_sock = nil
+    }
+
+    if len(keylookup_port) > 0 {
+        keylookup_sock, err := ctx.Socket(zmq.Req)
+        if err != nil {
+            panic(err)
+        }
+        defer func() { if r:= recover(); r != nil { keylookup_sock.Close(); panic(r) } }()
+
+        if err = keylookup_sock.Connect(keylookup_port); err != nil {
+            panic(err)
+        }
+    } else {
+        keylookup_sock = nil
+    }
+
+    return
+}
+
+func zmqsHandleError(chans *zmq.Channels) {
+    for error := range(chans.Errors()) {
+        chans.Close()
+        panic(error)
+    }
+}
+
+func (s ReqSocket) ZmqsRequestAnswer(request [][]byte) (answer []][]byte) {
+    sock := s.(*zmq.Socket)
+    if err = sock.Send(request); err != nil {
+        panic(err)
+    }
+    parts, err := sock.Recv()
+    if err != nil {
+        panic(err)
+    }
+    return parts
+}
+
+func (s PubSocket) ZmqsPublish(msg [][]byte) {
+    sock := s.(*zmq.Socket)
+    if err = sock.Send(msg); err != nil {
+        panic(err)
+    }
+}
+
+func (s ReqSocket) LookupCardIdNick(hexbytes []byte) (nick string, error) {
+    answ := s.ZmqsRequestAnswer([][]byte{hexbytes})
+    if len(answ) == 0 {
+        return "", errors.New("Empty reply received")
+    }    
+    if answ[0] == []byte("ERROR") {
+        return "", errors.New(string(bytes.Join(answ[1:])))
+    }
+    if answ[0] !=  []byte("RESULT") || len(answ) != 3{
+        return "", errors.New("Unknown reply received")
+    }
+    if answ[1] !=  hexbytes {
+        return "", errors.New("Wrong reply received")
+    }
+    return string(answ[2]), nil
+}
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