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state.go
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state.go
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package state
import (
"github.com/hashicorp/nomad/helper"
"github.com/hashicorp/nomad/plugins/drivers"
)
// LocalState is Task state which is persisted for use when restarting Nomad
// agents.
type LocalState struct {
Hooks map[string]*HookState
// DriverNetwork is the network information returned by the task
// driver's Start method
DriverNetwork *drivers.DriverNetwork
// TaskHandle is the handle used to reattach to the task during recovery
TaskHandle *drivers.TaskHandle
}
func NewLocalState() *LocalState {
return &LocalState{
Hooks: make(map[string]*HookState),
}
}
// Canonicalize ensures LocalState is in a consistent state by initializing
// Hooks and ensuring no HookState's are nil. Useful for cleaning unmarshalled
// state which may be in an unknown state.
func (s *LocalState) Canonicalize() {
if s.Hooks == nil {
// Hooks is nil, create it
s.Hooks = make(map[string]*HookState)
} else {
for k, v := range s.Hooks {
// Remove invalid nil entries from Hooks map
if v == nil {
delete(s.Hooks, k)
}
}
}
}
// Copy LocalState. Returns nil if nil.
func (s *LocalState) Copy() *LocalState {
if s == nil {
return nil
}
// Create a copy
c := &LocalState{
Hooks: make(map[string]*HookState, len(s.Hooks)),
DriverNetwork: s.DriverNetwork.Copy(),
TaskHandle: s.TaskHandle.Copy(),
}
// Copy the hook state
for h, state := range s.Hooks {
c.Hooks[h] = state.Copy()
}
return c
}
type HookState struct {
// Prestart is true if the hook has run Prestart successfully and does
// not need to run again
PrestartDone bool
// Data allows hooks to persist arbitrary state.
Data map[string]string
// Environment variables set by the hook that will continue to be set
// even if PrestartDone=true.
Env map[string]string
}
// Copy HookState. Returns nil if its nil.
func (h *HookState) Copy() *HookState {
if h == nil {
return nil
}
c := new(HookState)
*c = *h
c.Data = helper.CopyMapStringString(h.Data)
c.Env = helper.CopyMapStringString(h.Env)
return c
}
func (h *HookState) Equal(o *HookState) bool {
if h == nil || o == nil {
return h == o
}
if h.PrestartDone != o.PrestartDone {
return false
}
if !helper.CompareMapStringString(h.Data, o.Data) {
return false
}
return helper.CompareMapStringString(h.Env, o.Env)
}