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handlers.tmpl.go
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/
handlers.tmpl.go
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package eventService
const handlersTemplate = `// Generated automatically by golangAnnotations: do not edit manually
package {{.PackageName}}
import (
"encoding/json"
"fmt"
"net/http"
"golang.org/x/net/context"
"github.com/gorilla/mux"
)
{{range $idxService, $service := .Services -}}
{{ $eventServiceName := .Name -}}
func (es *{{$eventServiceName}}) SubscribeToEvents(router *mux.Router) {
const subscriber = "{{GetEventServiceSelfName .}}"
{{ $serviceName := GetEventServiceSelfName $service }}
{{range GetEventServiceTopics . -}}
{
bus.Subscribe("{{.}}", subscriber, es.enqueueEventToBackground)
router.HandleFunc("/tasks/{{ $serviceName }}/{{.}}/{eventTypeName}", es.handleHttpBackgroundEvent()).Methods("POST")
}
{{end -}}
}
func (es *{{$eventServiceName}}) enqueueEventToBackground(c context.Context, rc request.Context, topic string, envlp envelope.Envelope) error{
const subscriber = "{{GetEventServiceSelfName .}}"
switch envlp.EventTypeName {
case {{range $idxOper, $evtName := GetFullEventNames .}}{{if $idxOper}},{{end -}}{{$evtName}}{{end -}}:
taskUrl := fmt.Sprintf("/tasks/{{GetEventServiceSelfName .}}/%s/%s", topic, envlp.EventTypeName)
asJson, err := json.Marshal(envlp)
if err != nil {
msg := fmt.Sprintf("Error marshalling payload for url '%s'", taskUrl)
myerrorhandling.HandleEventError(c, rc, topic, envlp, msg, err)
return err
}
task := queue.Task{
Method: "POST",
URL: taskUrl,
Payload: asJson,
}
{{if IsAnyEventOperationDelayed . -}}
var delay time.Duration
var eta time.Time
switch envlp.EventTypeName {
{{range $oper := .Operations -}}{{if IsEventOperationDelayed $oper -}}
case {{GetInputArgPackage $oper}}.{{GetInputArgType $oper}}EventName:
delay, eta = get{{GetInputArgType $oper}}DelayOrETA(c, rc, envlp)
{{end -}}{{end -}}
}
task.Delay = delay
task.ETA = eta
{{end -}}
err = myqueue.AddTask(c, es.getProcessTypeFor(envlp), task)
if err != nil {
msg := fmt.Sprintf("Error enqueuing task to url '%s'", taskUrl)
myerrorhandling.HandleEventError(c, rc, topic, envlp, msg, err)
return err
}
mylog.New().Debug(c, "Subscriber '%s' enqueued task on topic '%s' with event '%s'", subscriber, topic, envlp.NiceName())
return nil
}
return nil
}
func (es *{{$eventServiceName}}) getProcessTypeFor(envlp envelope.Envelope) myqueue.ProcessType {
switch envlp.EventTypeName {
{{range $queueGroup := (GetEventOperationQueueGroups .) -}}
case {{range $idx, $event := $queueGroup.Events -}}
{{if $idx}},{{end}}{{$event}}EventName{{end}}:
return myqueue.ProcessType{{$queueGroup.Process}}
{{end -}}
default: return myqueue.ProcessTypeDefault
}
}
func (es *{{$eventServiceName}}) handleHttpBackgroundEvent() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
c := ctx.New.CreateContext(r)
rc := request.NewMinimalContext(c,r)
retryCount, err := strconv.Atoi(r.Header.Get("X-AppEngine-TaskRetryCount"))
if err != nil {
mylog.New().Error(c, rc, "Error parsing 'X-AppEngine-TaskRetryCount': %s", err)
}
if retryCount > 0 && !environ.GetEnvironment(c).RetryFailedEvents(c) {
mylog.New().Info(c, "Abort retry scheme after %d rertries because of env-setting", retryCount)
return
}
// read and parse request body
var envlp envelope.Envelope
err = json.NewDecoder(r.Body).Decode(&envlp)
if err != nil {
mylog.New().Error(c, rc, "Error parsing request body (retry-count:%d): %s", retryCount, err)
errorh.HandleHttpError(c, rc, errorh.NewInvalidInputErrorf(1, "Error parsing request body (retry-count:%d): %s", retryCount, err), w, r)
return
}
rc.Set(
request.SessionUID(envlp.SessionUID),
request.RequestUID(envlp.UUID), // pas a stable identifier that makes writing of resulting events idempotent
request.TaskRetryCount(retryCount),
)
err = es.handleEvent(c, rc, envlp.AggregateName, envlp)
if err != nil {
errorh.HandleHttpError(c, rc, err, w, r)
return
}
}
}
func (es *{{$eventServiceName}}) handleEvent(c context.Context, rc request.Context, topic string, envlp envelope.Envelope) error{
const subscriber = "{{GetEventServiceSelfName .}}"
{{range $idxOper, $oper := .Operations -}}
{{if IsEventOperation $oper -}}
{
evt, found := {{GetInputArgPackage $oper}}.GetIfIs{{GetInputArgType $oper}}(&envlp)
if found {
err := es.{{$oper.Name}}(c, rc, *evt)
if err != nil {
msg := fmt.Sprintf("As subscriber '%s': Failed to handle '%s' (retry: %d)", subscriber, envlp.NiceName(), rc.GetTaskRetryCount())
myerrorhandling.HandleEventError(c, rc, topic, envlp, msg, err)
return err
}
if rc.GetTaskRetryCount() > 0 {
myerrorhandling.HandleEventClearError(c, rc, topic, envlp, fmt.Sprintf("As subscriber '%s': Retry %d of '%s' succeeded", subscriber, rc.GetTaskRetryCount(), envlp.NiceName() ))
}
return nil
}
}
{{end -}}
{{end -}}
return nil
}
{{end -}}
`