/
events.go
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/
events.go
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package suture
import (
"fmt"
)
// Event defines the interface implemented by all events Suture will
// generate.
//
// Map will return a map with the details of the event serialized into a
// map[string]interface{}, with only the values suitable for serialization.
type Event interface {
fmt.Stringer
Type() EventType
Map() map[string]interface{}
}
type (
EventType int
EventHook func(Event)
// SprintFunc formats an arbitrary Go value into a string.
// It is used by the supervisor to format the value of a call
// to recover().
SprintFunc func(interface{}) string
)
const (
EventTypeStopTimeout EventType = iota
EventTypeServicePanic
EventTypeServiceTerminate
EventTypeBackoff
EventTypeResume
)
type EventStopTimeout struct {
Supervisor *Supervisor `json:"-"`
SupervisorName string `json:"supervisor_name"`
Service Service `json:"-"`
ServiceName string `json:"service"`
}
func (e EventStopTimeout) Type() EventType {
return EventTypeStopTimeout
}
func (e EventStopTimeout) String() string {
return fmt.Sprintf(
"%s: Service %s failed to terminate in a timely manner",
e.Supervisor,
e.Service,
)
}
func (e EventStopTimeout) Map() map[string]interface{} {
return map[string]interface{}{
"supervisor_name": e.SupervisorName,
"service_name": e.ServiceName,
}
}
type EventServicePanic struct {
Supervisor *Supervisor `json:"-"`
SupervisorName string `json:"supervisor_name"`
Service Service `json:"-"`
ServiceName string `json:"service_name"`
CurrentFailures float64 `json:"current_failures"`
FailureThreshold float64 `json:"failure_threshold"`
Restarting bool `json:"restarting"`
PanicMsg string `json:"panic_msg"`
Stacktrace string `json:"stacktrace"`
}
func (e EventServicePanic) Type() EventType {
return EventTypeServicePanic
}
func (e EventServicePanic) String() string {
return fmt.Sprintf(
"%s, panic: %s, stacktrace: %s",
serviceFailureString(
e.SupervisorName,
e.ServiceName,
e.CurrentFailures,
e.FailureThreshold,
e.Restarting,
),
e.PanicMsg,
string(e.Stacktrace),
)
}
func (e EventServicePanic) Map() map[string]interface{} {
return map[string]interface{}{
"supervisor_name": e.SupervisorName,
"service_name": e.ServiceName,
"current_failures": e.CurrentFailures,
"failure_threshold": e.FailureThreshold,
"restarting": e.Restarting,
"panic_msg": e.PanicMsg,
"stacktrace": e.Stacktrace,
}
}
type EventServiceTerminate struct {
Supervisor *Supervisor `json:"-"`
SupervisorName string `json:"supervisor_name"`
Service Service `json:"-"`
ServiceName string `json:"service_name"`
CurrentFailures float64 `json:"current_failures"`
FailureThreshold float64 `json:"failure_threshold"`
Restarting bool `json:"restarting"`
Err interface{} `json:"error_msg"`
}
func (e EventServiceTerminate) Type() EventType {
return EventTypeServiceTerminate
}
func (e EventServiceTerminate) String() string {
return fmt.Sprintf(
"%s, error: %s",
serviceFailureString(e.SupervisorName, e.ServiceName, e.CurrentFailures, e.FailureThreshold, e.Restarting),
e.Err)
}
func (e EventServiceTerminate) Map() map[string]interface{} {
return map[string]interface{}{
"supervisor_name": e.SupervisorName,
"service_name": e.ServiceName,
"current_failures": e.CurrentFailures,
"failure_threshold": e.FailureThreshold,
"restarting": e.Restarting,
"error": e.Err,
}
}
func serviceFailureString(supervisor, service string, currentFailures, failureThreshold float64, restarting bool) string {
return fmt.Sprintf(
"%s: Failed service '%s' (%f failures of %f), restarting: %#v",
supervisor,
service,
currentFailures,
failureThreshold,
restarting,
)
}
type EventBackoff struct {
Supervisor *Supervisor `json:"-"`
SupervisorName string `json:"supervisor_name"`
}
func (e EventBackoff) Type() EventType {
return EventTypeBackoff
}
func (e EventBackoff) String() string {
return fmt.Sprintf("%s: Entering the backoff state.", e.Supervisor)
}
func (e EventBackoff) Map() map[string]interface{} {
return map[string]interface{}{
"supervisor_name": e.SupervisorName,
}
}
type EventResume struct {
Supervisor *Supervisor `json:"-"`
SupervisorName string `json:"supervisor_name"`
}
func (e EventResume) Type() EventType {
return EventTypeResume
}
func (e EventResume) String() string {
return fmt.Sprintf("%s: Exiting backoff state.", e.Supervisor)
}
func (e EventResume) Map() map[string]interface{} {
return map[string]interface{}{
"supervisor_name": e.SupervisorName,
}
}