srkukarni commented on a change in pull request #3854: [issue #3767] support go
function for pulsar
URL: https://github.com/apache/pulsar/pull/3854#discussion_r272302963
##########
File path: pulsar-function-go/pf/instance.go
##########
@@ -29,68 +29,72 @@ import (
"github.com/apache/pulsar/pulsar-function-go/pb"
)
-type GoInstance struct {
- function Function
+type goInstance struct {
+ function function
context *FunctionContext
producer pulsar.Producer
consumers map[string]pulsar.Consumer
client pulsar.Client
}
-// NewGoInstance init GoInstance and init function context
-func NewGoInstance() *GoInstance {
- goInstance := &GoInstance{
+// newGoInstance init goInstance and init function context
+func newGoInstance() *goInstance {
+ goInstance := &goInstance{
context: NewFuncContext(),
consumers: make(map[string]pulsar.Consumer),
}
return goInstance
}
-func (gi *GoInstance) StartFunction(function Function) {
+func (gi *goInstance) startFunction(function function) error {
gi.function = function
err := gi.setupClient()
if err != nil {
- panic("setup client failed, please check.")
+ log.Errorf("setup client failed, error is:%v", err)
+ return err
}
err = gi.setupProducer()
if err != nil {
- panic("setup producer failed, please check.")
+ log.Errorf("setup producer failed, error is:%v", err)
+ return err
}
channel, err := gi.setupConsumer()
if err != nil {
- panic("setup consumer failed, please check.")
+ log.Errorf("setup consumer failed, error is:%v", err)
+ return err
}
CLOSE:
for {
select {
case cm := <-channel:
msgInput := cm.Message
- atMostOnce :=
gi.context.InstanceConf.FuncDetails.ProcessingGuarantees ==
pb.ProcessingGuarantees_ATMOST_ONCE
- autoAck := gi.context.InstanceConf.FuncDetails.AutoAck
+ atMostOnce :=
gi.context.instanceConf.funcDetails.ProcessingGuarantees ==
pb.ProcessingGuarantees_ATMOST_ONCE
+ autoAck := gi.context.instanceConf.funcDetails.AutoAck
if autoAck && atMostOnce {
gi.ackInputMessage(msgInput)
}
output, err := gi.handlerMsg(msgInput)
if err != nil {
log.Errorf("handler message error:%v", err)
gi.nackInputMessage(msgInput)
- } else {
- gi.processResult(msgInput, output)
+ return err
Review comment:
in google logging library log(fatal) means process death. I assumed that
would be the case with go as well. my mistake.
In any case, in case of any error while handleMessage, if effectively once,
just panic. else if atleast_once, nack. That should do the trick
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