func recv(conn *stompngo.Connection, s int) {
ltag := tag + "-recv"
ll.Printf("%stag:%s connsess:%s receiver_starts s:%d\n",
exampid, ltag, conn.Session(),
s)
// Setup Headers ...
id := stompngo.Uuid() // Use package convenience function for unique ID
d := sngecomm.Dest()
ackMode = sngecomm.AckMode() // get ack mode
pbc := sngecomm.Pbc() // Print byte count
sc := sngecomm.HandleSubscribe(conn, d, id, ackMode)
// Receive loop.
mc := 0
var md stompngo.MessageData
for {
select {
case md = <-sc: // Read a messagedata struct, with a MESSAGE frame
case md = <-conn.MessageData: // Read a messagedata struct, with a ERROR/RECEIPT frame
// Frames RECEIPT or ERROR not expected here
ll.Fatalf("%stag:%s connsess:%s bad_frame md:%v",
exampid, ltag, conn.Session(),
md) // Handle this ......
}
//
mc++
if md.Error != nil {
ll.Fatalf("%stag:%s connsess:%s error_read error:%v",
exampid, ltag, conn.Session(),
md.Error) // Handle this ......
}
ll.Printf("%stag:%s connsess:%s received_message s:%d id:%s mc:%d\n",
exampid, ltag, conn.Session(),
s, id, mc)
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, conn.Session(),
ss)
}
// time.Sleep(3 * time.Second) // A very arbitrary number
// time.Sleep(500 * time.Millisecond) // A very arbitrary number
runtime.Gosched()
time.Sleep(1500 * time.Millisecond) // A very arbitrary number
runtime.Gosched()
if ackMode != "auto" {
sngecomm.HandleAck(conn, md.Message.Headers, id)
ll.Printf("%stag:%s connsess:%s ack_complete s:%d id:%s mc:%d\n",
exampid, ltag, conn.Session(),
s, id, mc)
}
runtime.Gosched()
}
}
// 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))
}
/*
runReceive receives all messages from a specified queue.
*/
func runReceive(conn *stompngo.Connection, q int, w *sync.WaitGroup) {
ltag := tag + "-runreceive"
qns := fmt.Sprintf("%d", q) // queue number
id := stompngo.Uuid() // A unique subscription ID
d := sngecomm.Dest() + "." + qns
ll.Printf("%stag:%s connsess:%s starts id:%s qns:%s d:%s\n",
exampid, ltag, conn.Session(),
id, qns, d)
// Subscribe (use common helper)
sc := sngecomm.HandleSubscribe(conn, d, id, sngecomm.AckMode())
ll.Printf("%stag:%s connsess:%s subscribe_done id:%s qns:%s d:%s\n",
exampid, ltag, conn.Session(),
id, qns, d)
//
tmr := time.NewTimer(100 * time.Hour)
pbc := sngecomm.Pbc() // Print byte count
nmsgs := senv.Nmsgs()
// Receive loop
var md stompngo.MessageData
for mc := 1; mc <= nmsgs; mc++ {
ll.Printf("%stag:%s connsess:%s chanchek id:%s qns:%s lensc:%d capsc:%d\n",
exampid, ltag, conn.Session(),
id, qns, len(sc), cap(sc))
select {
case md = <-sc:
case md = <-conn.MessageData:
// Frames RECEIPT or ERROR not expected here
ll.Fatalf("%stag:%s connsess:%s send_error qns:%v md:%v",
exampid, ltag, conn.Session(),
qns, md) // Handle this ......
}
if md.Error != nil {
ll.Fatalf("%stag:%s connsess:%s receive_error qns:%v error:%v\n",
exampid, ltag, conn.Session(),
qns, md.Error)
}
// Process the inbound message .................
ll.Printf("%stag:%s connsess:%s inbound id:%s qns:%s mc:%d\n",
exampid, ltag, conn.Session(),
id, qns, mc)
// Sanity check the message Command, and the queue and message numbers
mns := fmt.Sprintf("%d", mc) // string message number
if md.Message.Command != stompngo.MESSAGE {
ll.Fatalf("%stag:%s connsess:%s bad_frame qns:%s mc:%d md:%v\n",
exampid, ltag, conn.Session(),
qns, mc, md)
}
if !md.Message.Headers.ContainsKV("qnum", qns) || !md.Message.Headers.ContainsKV("msgnum", mns) {
ll.Fatalf("%stag:%s connsess:%s dirty_message qns:%v msgnum:%v md:%v",
exampid, tag, conn.Session(),
qns, mns, md) // Handle this ......
}
sl := len(md.Message.Body)
if pbc > 0 {
sl = pbc
if len(md.Message.Body) < sl {
sl = len(md.Message.Body)
}
}
ll.Printf("%stag:%s connsess:%s runReceive_recv_message id:%s body:%s qns:%s msgnum:%s\n",
exampid, ltag, conn.Session(),
id, string(md.Message.Body[0:sl]), qns,
md.Message.Headers.Value("msgnum"))
// Handle ACKs if needed
if sngecomm.AckMode() != "auto" {
ah := stompngo.Headers{}
sngecomm.HandleAck(conn, ah, id)
}
if mc == nmsgs {
break
}
if rw {
dt := time.Duration(sngecomm.ValueBetween(min, max, rf))
ll.Printf("%stag:%s connsess:%s recv_stagger dt:%v qns:%s mc:%d\n",
exampid, ltag, conn.Session(),
dt, qns, mc)
tmr.Reset(dt)
_ = <-tmr.C
runtime.Gosched()
}
}
// Unsubscribe
sngecomm.HandleUnsubscribe(conn, d, id)
ll.Printf("%stag:%s connsess:%s runRecieve_ends id:%s qns:%s\n",
exampid, ltag, conn.Session(),
id, qns)
w.Done()
}
// Connect to a STOMP broker, receive some messages and disconnect.
func main() {
st := time.Now()
// Standard example connect sequence
// Use AMQ port here
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
// Setup Headers ...
id := stompngo.Uuid() // Use package convenience function for unique ID
d := "jms.queue.exampleQueue"
sc := sngecomm.HandleSubscribe(conn, d, id, "auto")
ll.Printf("%stag:%s connsess:%s stomp_subscribe_complete\n",
exampid, tag, conn.Session())
//
var md stompngo.MessageData
// Read data from the returned channel
for i := 1; i <= nmsgs; i++ {
select {
case md = <-sc:
case md = <-conn.MessageData:
// Frames RECEIPT or ERROR not expected here
ll.Fatalf("%stag:%s connsess:%s bad_frame error:%v",
exampid, tag, conn.Session(),
e.Error()) // Handle this ......
}
ll.Printf("%stag:%s connsess:%s 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 error_read error:%v",
exampid, tag, conn.Session(),
e.Error()) // Handle this ......
}
ll.Printf("%stag:%s connsess:%s frame_type cmd:%s\n",
exampid, tag, conn.Session(),
md.Message.Command)
if md.Message.Command != stompngo.MESSAGE {
ll.Fatalf("%stag:%s connsess:%s error_frame_type error:%v",
exampid, tag, conn.Session(),
e.Error()) // 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 payload body:%s\n",
exampid, tag, conn.Session(),
ss)
}
}
//
sngecomm.HandleUnsubscribe(conn, d, id)
ll.Printf("%stag:%s connsess:%s 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 main_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)
}
}
// Asynchronously process all messages for a given subscription.
func receiveWorker(sc <-chan stompngo.MessageData, qns string, nmsgs int,
qc chan<- bool, conn *stompngo.Connection, id string) {
//
ltag := tag + "-receiveWorker"
tmr := time.NewTimer(100 * time.Hour)
pbc := sngecomm.Pbc() // Print byte count
// Receive loop
var md stompngo.MessageData
for i := 1; i <= nmsgs; i++ {
select {
case md = <-sc:
case md = <-conn.MessageData:
// Frames RECEIPT or ERROR not expected here
ll.Fatalf("%stag:%s connsess:%s bad_frame qns:%v md:%v",
exampid, ltag, conn.Session(),
qns, md) // Handle this ......
}
if md.Error != nil {
ll.Fatalf("%stag:%s connsess:%s recv_error qns:%v error:%v",
exampid, ltag, conn.Session(),
qns, md.Error) // Handle this ......
}
// Sanity check the queue and message numbers
mns := fmt.Sprintf("%d", i) // message number
if !md.Message.Headers.ContainsKV("qnum", qns) || !md.Message.Headers.ContainsKV("msgnum", mns) {
ll.Fatalf("%stag:%s connsess:%s dirty_message qnum:%v msgnum:%v md:%v",
exampid, ltag, conn.Session(),
qns, mns, md) // Handle this ......
}
// Process the inbound message .................
sl := len(md.Message.Body)
if pbc > 0 {
sl = pbc
if len(md.Message.Body) < sl {
sl = len(md.Message.Body)
}
}
// Handle ACKs if needed
if sngecomm.AckMode() != "auto" {
ah := []string{}
sngecomm.HandleAck(conn, ah, id)
}
ll.Printf("%stag:%s connsess:%s recv_message body:%s qns:%s msgnum:%s i:%v\n",
exampid, ltag, conn.Session(),
string(md.Message.Body[0:sl]),
qns,
md.Message.Headers.Value("msgnum"), i)
if i == nmsgs {
break
}
if rw {
runtime.Gosched() // yield for this example
dt := time.Duration(sngecomm.ValueBetween(min, max, rf))
ll.Printf("%stag:%s connsess:%s recv_stagger dt:%v qns:%s\n",
exampid, ltag, conn.Session(),
dt, qns)
tmr.Reset(dt)
_ = <-tmr.C
}
}
//
qc <- true
}
func receiveMessages(conn *stompngo.Connection, qnum int, nc net.Conn) {
ltag := tag + "-receivemessages"
qns := fmt.Sprintf("%d", qnum) // queue number
d := sngecomm.Dest() + "." + qns
id := stompngo.Uuid() // A unique subscription ID
ll.Printf("%stag:%s connsess:%s receiveMessages_start id:%s d:%s qnum:%d nmsgs:%d\n",
exampid, ltag, conn.Session(),
id, d, qnum, nmsgs)
// Subscribe
sc := sngecomm.HandleSubscribe(conn, d, id, sngecomm.AckMode())
pbc := sngecomm.Pbc() // Print byte count
//
tmr := time.NewTimer(100 * time.Hour)
var md stompngo.MessageData
for mc := 1; mc <= nmsgs; mc++ {
select {
case md = <-sc:
case md = <-conn.MessageData:
// Frames RECEIPT or ERROR not expected here
ll.Fatalf("%stag:%s connsess:%s send_error qns:%v md:%v",
exampid, ltag, conn.Session(),
qns, md) // Handle this ......
}
if md.Error != nil {
ll.Fatalf("%stag:%s connsess:%s receive_error qns:%v error:%v\n",
exampid, ltag, conn.Session(),
qns, md.Error)
}
if md.Message.Command != stompngo.MESSAGE {
ll.Fatalf("%stag:%s connsess:%s bad_frame qns:%s mc:%d md:%v\n",
exampid, ltag, conn.Session(),
qns, mc, md)
}
mcs := fmt.Sprintf("%d", mc) // message number
if !md.Message.Headers.ContainsKV("qnum", qns) || !md.Message.Headers.ContainsKV("msgnum", mcs) {
ll.Fatalf("%stag:%s connsess:%s dirty_message qns:%v msgnum:%v md:%v",
exampid, tag, conn.Session(),
qns, mcs, md) // Handle this ......
}
// Process the inbound message .................
sl := len(md.Message.Body)
if pbc > 0 {
sl = pbc
if len(md.Message.Body) < sl {
sl = len(md.Message.Body)
}
}
ll.Printf("%stag:%s connsess:%s receiveMessages_msg d:%s body:%s qnum:%d msgnum:%s\n",
exampid, ltag, conn.Session(),
d, string(md.Message.Body[0:sl]), qnum,
md.Message.Headers.Value("msgnum"))
if mc == nmsgs {
break
}
// Handle ACKs if needed
if sngecomm.AckMode() != "auto" {
ah := []string{}
sngecomm.HandleAck(conn, ah, id)
}
if mc == nmsgs {
break
}
//
if rw {
runtime.Gosched() // yield for this example
dt := time.Duration(sngecomm.ValueBetween(min, max, rf))
ll.Printf("%stag:%s connsess:%s recv_stagger dt:%v qns:%s mc:%d\n",
exampid, ltag, conn.Session(),
dt, qns, mc)
tmr.Reset(dt)
_ = <-tmr.C
}
}
ll.Printf("%stag:%s connsess:%s end d:%s qnum:%d nmsgs:%d\n",
exampid, ltag, conn.Session(),
d, qnum, nmsgs)
// Unsubscribe
sngecomm.HandleUnsubscribe(conn, d, id)
//
}
// Receive messages from a particular queue
func receiver(qn, mc int) {
ltag := tag + "-receiver"
qns := fmt.Sprintf("%d", qn) // string queue number
pbc := sngecomm.Pbc()
id := stompngo.Uuid() // A unique subscription ID
d := sngecomm.Dest() + "." + qns
ll.Printf("%stag:%s connsess:%s queue_info id:%v d:%v qnum:%v mc:%v\n",
exampid, ltag, conn.Session(),
id, d, qn, mc)
// Subscribe
sc := sngecomm.HandleSubscribe(conn, d, id, sngecomm.AckMode())
ll.Printf("%stag:%s connsess:%s subscribe_complete id:%v d:%v qnum:%v mc:%v\n",
exampid, ltag, conn.Session(),
id, d, qn, mc)
//
tmr := time.NewTimer(100 * time.Hour)
var md stompngo.MessageData
// Receive loop
for i := 1; i <= mc; i++ {
ll.Printf("%stag:%s connsess:%s recv_ranchek id:%v d:%v qnum:%v mc:%v chlen:%v chcap:%v\n",
exampid, ltag, conn.Session(),
id, d, qn, mc, len(sc), cap(sc))
select {
case md = <-sc:
case md = <-conn.MessageData:
// A RECEIPT or ERROR frame is unexpected here
ll.Fatalf("%stag:%s connsess:%s bad_frame qnum:%v headers:%v body:%s",
exampid, tag, conn.Session(),
qn, md.Message.Headers, md.Message.Body) // Handle this ......
}
if md.Error != nil {
ll.Fatalf("%stag:%s connsess:%s recv_error qnum:%v error:%v",
exampid, tag, conn.Session(),
qn, md.Error) // Handle this ......
}
// Process the inbound message .................
ll.Printf("%stag:%s connsess:%s recv_message qnum:%v i:%v\n",
exampid, tag, conn.Session(),
qn, i)
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 qnum:%v body:%s\n",
exampid, tag, conn.Session(),
qn, ss)
}
// Sanity check the message Command, and the queue and message numbers
mns := fmt.Sprintf("%d", i) // message number
if md.Message.Command != stompngo.MESSAGE {
ll.Fatalf("%stag:%s connsess:%s bad_frame qnum:%v command:%v headers:%v body:%v\n",
exampid, tag, conn.Session(),
qn, md.Message.Command, md.Message.Headers, string(md.Message.Body)) // Handle this ......
}
if !md.Message.Headers.ContainsKV("qnum", qns) || !md.Message.Headers.ContainsKV("msgnum", mns) {
ll.Fatalf("%stag:%s connsess:%s dirty_message qns:%v msgnum:%v command:%v headers:%v body:%v\n",
exampid, tag, conn.Session(),
qns, mns, md.Message.Command, md.Message.Headers, string(md.Message.Body)) // Handle this ......) // Handle this ......
}
if i == mc {
break
}
if rw {
dt := time.Duration(sngecomm.ValueBetween(min, max, rf))
ll.Printf("%stag:%s connsess:%s recv_stagger id:%v d:%v qnum:%v stagger:%v\n",
exampid, ltag, conn.Session(),
id, d, qn, dt)
tmr.Reset(dt)
_ = <-tmr.C
runtime.Gosched()
}
// Handle ACKs if needed
if sngecomm.AckMode() != "auto" {
sngecomm.HandleAck(conn, md.Message.Headers, id)
}
}
// Unsubscribe
sngecomm.HandleUnsubscribe(conn, d, id)
ll.Printf("%stag:%s connsess:%s unsubscribe_complete id:%v d:%v qnum:%v mc:%v\n",
exampid, ltag, conn.Session(),
id, d, qn, mc)
// Receiving is done
ll.Printf("%stag:%s connsess:%s recv_end id:%v d:%v qnum:%v mc:%v\n",
exampid, ltag, conn.Session(),
id, d, qn, mc)
wgr.Done()
}