// Example destination func Dest() string { d := senv.Dest() if os.Getenv("STOMP_ARTEMIS") == "" { return d } pref := "jms.queue" if strings.Index(d, "topic") >= 0 { pref = "jms.topic" } return pref + strings.Replace(d, "/", ".", -1) }
// Connect to a STOMP broker, receive some messages, ACK them, and disconnect. func main() { st := time.Now() // Standard example connect sequence n, conn, e := sngecomm.CommonConnect(exampid, tag, ll) if e != nil { ll.Fatalf("%stag:%s connsess:%s main_on_connect error:%v", exampid, tag, sngecomm.Lcs, e.Error()) // Handle this ...... } pbc := sngecomm.Pbc() // Print byte count // *NOTE* your application functionaltiy goes here! // With Stomp, you must SUBSCRIBE to a destination in order to receive. // Subscribe returns a channel of MessageData struct. // Here we use a common utility routine to handle the differing subscribe // requirements of each protocol level. d := senv.Dest() id := stompngo.Uuid() sc := sngecomm.HandleSubscribe(conn, d, id, "client") ll.Printf("%stag:%s connsess:%s main_subscribe_complete\n", exampid, tag, conn.Session()) // Read data from the returned channel var md stompngo.MessageData for i := 1; i <= senv.Nmsgs(); i++ { select { case md = <-sc: case md = <-conn.MessageData: // Frames RECEIPT or ERROR not expected here ll.Fatalf("%stag:%s connsess:%s main_channel_frame error:%v", exampid, tag, conn.Session(), e.Error()) // Handle this ...... } ll.Printf("%stag:%s connsess:%s main_channel_read_complete\n", exampid, tag, conn.Session()) // MessageData has two components: // a) a Message struct // b) an Error value. Check the error value as usual if md.Error != nil { ll.Fatalf("%stag:%s connsess:%s main_channel_read error:%v", exampid, tag, conn.Session(), e.Error()) // Handle this ...... } // ll.Printf("%stag:%s connsess:%s frame_type:%v\n", exampid, tag, conn.Session(), md.Message.Command) if md.Message.Command != stompngo.MESSAGE { ll.Fatalf("%stag:%s connsess:%s bad_frame frame:%v", exampid, tag, conn.Session(), md.Message.Command) // Handle this ...... } wh := md.Message.Headers for j := 0; j < len(wh)-1; j += 2 { ll.Printf("%stag:%s connsess:%s header:%s:%s\n", exampid, tag, conn.Session(), wh[j], wh[j+1]) } if pbc > 0 { maxlen := pbc if len(md.Message.Body) < maxlen { maxlen = len(md.Message.Body) } ss := string(md.Message.Body[0:maxlen]) ll.Printf("%stag:%s connsess:%s message_payload body:%s\n", exampid, tag, conn.Session(), ss) } // ACK the message just received. // Agiain we use a utility routine to handle the different requirements // of the protocol versions. sngecomm.HandleAck(conn, md.Message.Headers, id) ll.Printf("%stag:%s connsess:%s ack_complete\n", exampid, tag, conn.Session()) } // It is polite to unsubscribe, although unnecessary if a disconnect follows. // Again we use a utility routine to handle the different protocol level // requirements. sngecomm.HandleUnsubscribe(conn, d, id) ll.Printf("%stag:%s connsess:%s stomp_unsubscribe_complete\n", exampid, tag, conn.Session()) // Standard example disconnect sequence e = sngecomm.CommonDisconnect(n, conn, exampid, tag, ll) if e != nil { ll.Fatalf("%stag:%s connsess:%s disconnect error:%v", exampid, tag, conn.Session(), e.Error()) // Handle this ...... } ll.Printf("%stag:%s connsess:%s main_elapsed:%v\n", exampid, tag, conn.Session(), time.Now().Sub(st)) }
func runNextQueue(qn int, conn *stompngo.Connection) { qns := fmt.Sprintf("%d", qn) // string number of the queue conn.SetLogger(ll) // stompngo logging pbc := sngecomm.Pbc() // Print byte count d := senv.Dest() + qns // Destination id := stompngo.Uuid() // A unique name/id nmsgs := qn // int number of messages to get, same as queue number am := sngecomm.AckMode() // ACK mode to use on SUBSCRIBE nfa := true // Need "final" ACK (possiby reset below) wh := stompngo.Headers{} // Starting SUBSCRIBE headers // Sanity check ACK mode if conn.Protocol() == stompngo.SPL_10 && am == stompngo.AckModeClientIndividual { ll.Fatalf("%stag:%s connsess:%s invalid_ack_mode am:%v proto:%v\n", exampid, tag, session, am, conn.Protocol()) // } // Do not do final ACK if running ACKs are issued if am == stompngo.AckModeClientIndividual || am == stompngo.AckModeAuto { nfa = false } // Show run parameters ll.Printf("%stag:%s connsess:%s run_parms\n\tqns:%v\n\tpbc:%v\n\td:%v\n\tid:%v\n\tnmsgs:%v\n\tam:%v\n\tnfa:%v\n\twh:%v\n", exampid, tag, session, qns, pbc, d, id, nmsgs, am, nfa, wh) // Run SUBSCRIBE sc := doSubscribe(conn, d, id, am, wh) ll.Printf("%stag:%s connsess:%s stomp_subscribe_complete\n", exampid, tag, session) var md stompngo.MessageData // Message data from basic read var lmd stompngo.MessageData // Possible save (copy) of received data mc := 1 // Initial message number // Loop for the requested number of messages GetLoop: for { ll.Printf("%stag:%s connsess:%s start_of_read_loop mc:%v nmsgs:%v\n", exampid, tag, session, mc, nmsgs) mcs := fmt.Sprintf("%d", mc) // string number message count // Get something from the stompngo read routine select { case md = <-sc: case md = <-conn.MessageData: // if md.Message.Command == stompngo.RECEIPT { ll.Printf("%stag:%s connsess:%s have_receipt md:%v\n", exampid, tag, session, md) continue GetLoop } ll.Fatalf("%stag:%s connsess:%s ERROR_frame hdrs:%v body:%v\n", exampid, tag, session, md.Message.Headers, string(md.Message.Body)) // Handle this ...... } // Save message data for possible use in the final ACK if mc == nmsgs && nfa { lmd = md // Save last message } // Basic loop logging ll.Printf("%stag:%s connsess:%s channel_read_complete qn:%d mc:%d\n", exampid, tag, session, qn, mc) ll.Printf("%stag:%s connsess:%s message_number:%v\n", exampid, tag, session, mc) // Check if reader returned any error if md.Error != nil { ll.Fatalf("%stag:%s connsess:%s error_read error:%v", exampid, tag, session, md.Error) // Handle this ...... } // Show frame type ll.Printf("%stag:%s connsess:%s frame_type cmd:%s\n", exampid, tag, session, md.Message.Command) // Pure sanity check: this should *never* happen based on logic // above. if md.Message.Command != stompngo.MESSAGE { ll.Fatalf("%stag:%s connsess:%s error_frame_type md:%v", exampid, tag, session, md) // Handle this ...... } // Show Message Headers wh := md.Message.Headers for j := 0; j < len(wh)-1; j += 2 { ll.Printf("%stag:%s connsess:%s Header:%s:%s\n", exampid, tag, session, wh[j], wh[j+1]) } // Show (part of) Message Body if pbc > 0 { maxlen := pbc if len(md.Message.Body) < maxlen { maxlen = len(md.Message.Body) } ss := string(md.Message.Body[0:maxlen]) ll.Printf("%stag:%s connsess:%s payload body:%s\n", exampid, tag, session, ss) } // Sanity check this message payload wm := wlp + mcs // The left part plus the (string) meassage number] bm := string(md.Message.Body) if bm != wm { ll.Fatalf("%stag:%s connsess:%s error_message_payload\n\tGot %s\n\tWant%s\n", exampid, tag, session, bm, wm) // Handle this ...... } else { ll.Printf("%stag:%s connsess:%s matched_body_string\n%s\n%s\n", exampid, tag, session, bm, wm) // Handle this ......) } // Run individual ACK if required if am == stompngo.AckModeClientIndividual { wh := md.Message.Headers // Copy Headers if ar { // ACK receipt wanted wh = wh.Add(stompngo.HK_RECEIPT, "rwanted-"+mcs) } sngecomm.HandleAck(conn, wh, id) ll.Printf("%stag:%s connsess:%s individual_ack_complete mc:%v headers:%v\n", exampid, tag, session, mc, md.Message.Headers) } // Check for end of loop condition if mc == nmsgs { break } // Increment loop/message counter mc++ } qc := make(chan bool) go drainSub(session, sc, qc, qn) dd := false // Issue the final ACK if needed if nfa { wh := lmd.Message.Headers // Copy Headers if ar { // ACK receipt wanted wh = wh.Add(stompngo.HK_RECEIPT, "rwanted-fin") } sngecomm.HandleAck(conn, wh, id) ll.Printf("%stag:%s connsess:%s final_ack_complete\n", exampid, tag, session) if ar { ll.Printf("%stag:%s connsess:%s ack_receive_wait_for_drain qn:%d\n", exampid, tag, session, qn) <-qc // Wait for drainSub ll.Printf("%stag:%s connsess:%s ack_receive_drain_complete qn:%d\n", exampid, tag, session, qn) dd = true getReceipt(conn) } } if !dd { ll.Printf("%stag:%s connsess:%s message_loop_wait_for_drain qn:%d\n", exampid, tag, session, qn) <-qc ll.Printf("%stag:%s connsess:%s message_loop_drain_complete qn:%d\n", exampid, tag, session, qn) } // Unsubscribe (may be skipped if requested) if unsub { sngecomm.HandleUnsubscribe(conn, d, id) ll.Printf("%stag:%s connsess:%s stomp_unsubscribe_complete\n", exampid, tag, session) } else { ll.Printf("%stag:%s connsess:%s skipping_unsubscribe\n", exampid, tag, session) } }