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parser.go
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parser.go
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package event
import (
"encoding/json"
"fmt"
"reflect"
"strings"
"github.com/concourse/concourse/atc"
)
type eventTable map[atc.EventType]eventVersions
type eventVersions map[atc.EventVersion]eventParser
type eventParser func([]byte) (atc.Event, error)
var events = eventTable{}
func unmarshaler(e atc.Event) func([]byte) (atc.Event, error) {
return func(payload []byte) (atc.Event, error) {
val := reflect.New(reflect.TypeOf(e))
err := json.Unmarshal(payload, val.Interface())
return val.Elem().Interface().(atc.Event), err
}
}
func RegisterEvent(e atc.Event) {
versions, found := events[e.EventType()]
if !found {
versions = eventVersions{}
events[e.EventType()] = versions
}
versions[e.Version()] = unmarshaler(e)
}
func init() {
RegisterEvent(InitializeCheck{})
RegisterEvent(InitializeTask{})
RegisterEvent(StartTask{})
RegisterEvent(FinishTask{})
RegisterEvent(InitializeGet{})
RegisterEvent(StartGet{})
RegisterEvent(FinishGet{})
RegisterEvent(InitializePut{})
RegisterEvent(StartPut{})
RegisterEvent(FinishPut{})
RegisterEvent(SetPipelineChanged{})
RegisterEvent(Status{})
RegisterEvent(WaitingForWorker{})
RegisterEvent(SelectedWorker{})
RegisterEvent(StreamingVolume{})
RegisterEvent(WaitingForStreamedVolume{})
RegisterEvent(Log{})
RegisterEvent(Error{})
RegisterEvent(ImageCheck{})
RegisterEvent(ImageGet{})
RegisterEvent(AcrossSubsteps{})
// deprecated:
RegisterEvent(InitializeV10{})
RegisterEvent(FinishV10{})
RegisterEvent(StartV10{})
RegisterEvent(InputV10{})
RegisterEvent(InputV20{})
RegisterEvent(OutputV10{})
RegisterEvent(OutputV20{})
RegisterEvent(ErrorV10{})
RegisterEvent(ErrorV20{})
RegisterEvent(ErrorV30{})
RegisterEvent(FinishTaskV10{})
RegisterEvent(FinishTaskV20{})
RegisterEvent(FinishTaskV30{})
RegisterEvent(InitializeTaskV10{})
RegisterEvent(InitializeTaskV20{})
RegisterEvent(InitializeTaskV30{})
RegisterEvent(StartTaskV10{})
RegisterEvent(StartTaskV20{})
RegisterEvent(StartTaskV30{})
RegisterEvent(StartTaskV40{})
RegisterEvent(LogV10{})
RegisterEvent(LogV20{})
RegisterEvent(LogV30{})
RegisterEvent(LogV40{})
RegisterEvent(FinishGetV10{})
RegisterEvent(FinishGetV20{})
RegisterEvent(FinishGetV30{})
RegisterEvent(FinishPutV10{})
RegisterEvent(FinishPutV20{})
RegisterEvent(FinishPutV30{})
RegisterEvent(InitializeGetV10{})
RegisterEvent(InitializePutV10{})
RegisterEvent(FinishGetV40{})
RegisterEvent(FinishPutV40{})
}
type Message struct {
Event atc.Event
}
type Envelope struct {
Data *json.RawMessage `json:"data"`
Event atc.EventType `json:"event"`
Version atc.EventVersion `json:"version"`
EventID string `json:"event_id"`
}
func (m Message) MarshalJSON() ([]byte, error) {
var envelope Envelope
payload, err := json.Marshal(m.Event)
if err != nil {
return nil, err
}
envelope.Data = (*json.RawMessage)(&payload)
envelope.Event = m.Event.EventType()
envelope.Version = m.Event.Version()
return json.Marshal(envelope)
}
func (m *Message) UnmarshalJSON(bytes []byte) error {
var envelope Envelope
err := json.Unmarshal(bytes, &envelope)
if err != nil {
return err
}
event, err := ParseEvent(envelope.Version, envelope.Event, *envelope.Data)
if err != nil {
return err
}
m.Event = event
return nil
}
type UnknownEventTypeError struct {
Type atc.EventType
}
func (err UnknownEventTypeError) Error() string {
return fmt.Sprintf("unknown event type: %s", err.Type)
}
type UnknownEventVersionError struct {
Type atc.EventType
Version atc.EventVersion
KnownVersions []string
}
func (err UnknownEventVersionError) Error() string {
return fmt.Sprintf(
"unknown event version: %s version %s (supported versions: %s)",
err.Type,
err.Version,
strings.Join(err.KnownVersions, ", "),
)
}
func ParseEvent(version atc.EventVersion, typ atc.EventType, payload []byte) (atc.Event, error) {
versions, found := events[typ]
if !found {
return nil, UnknownEventTypeError{typ}
}
knownVersions := []string{}
for v, parser := range versions {
knownVersions = append(knownVersions, string(v))
if v.IsCompatibleWith(version) {
return parser(payload)
}
}
return nil, UnknownEventVersionError{
Type: typ,
Version: version,
KnownVersions: knownVersions,
}
}