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Copy pathexternalagent_states.go
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209 lines (173 loc) · 5.92 KB
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package core
// ExternalAgentState is external agent state interface
type ExternalAgentState interface {
Register([]Event) error
Ready() error
InitError(errorType string) error
ExitError(errorType string) error
ShutdownFailed() error
Exited() error
LaunchError(error) error
Name() string
}
// ExternalAgentStartedState is the initial state of an external agent
type ExternalAgentStartedState struct {
disallowEverything
agent *ExternalAgent
initFlow InitFlowSynchronization
}
// Register an agent with the platform when agent is in started state
func (s *ExternalAgentStartedState) Register(events []Event) error {
for _, e := range events {
if err := s.agent.subscribeUnsafe(e); err != nil {
return err
}
}
s.agent.setStateUnsafe(s.agent.RegisteredState)
s.initFlow.ExternalAgentRegistered()
return nil
}
// LaunchError signals that agent could not launch (non-exec/permission denied)
func (s *ExternalAgentStartedState) LaunchError(err error) error {
s.agent.setStateUnsafe(s.agent.LaunchErrorState)
s.agent.errorType = string(MapErrorToAgentInfoErrorType(err))
return nil
}
// Name return state's human friendly name
func (s *ExternalAgentStartedState) Name() string {
return AgentStartedStateName
}
// ExternalAgentRegisteredState is the state of an agent that registered with the platform but has not reported ready (next)
type ExternalAgentRegisteredState struct {
disallowEverything
agent *ExternalAgent
initFlow InitFlowSynchronization
}
// Ready - agent has called next and is now successfully initialized
func (s *ExternalAgentRegisteredState) Ready() error {
s.agent.setStateUnsafe(s.agent.ReadyState)
s.initFlow.AgentReady()
s.agent.ManagedThread.SuspendUnsafe()
if s.agent.currentState != s.agent.ReadyState {
return ErrConcurrentStateModification
}
s.agent.setStateUnsafe(s.agent.RunningState)
return nil
}
// InitError - agent can transitions to InitErrorState if it failed to initialize
func (s *ExternalAgentRegisteredState) InitError(errorType string) error {
s.agent.setStateUnsafe(s.agent.InitErrorState)
s.agent.errorType = errorType
return nil
}
// ExitError - agent called /exit/error
func (s *ExternalAgentRegisteredState) ExitError(errorType string) error {
s.agent.setStateUnsafe(s.agent.ExitErrorState)
s.agent.errorType = errorType
return nil
}
// Name return state's human friendly name
func (s *ExternalAgentRegisteredState) Name() string {
return AgentRegisteredStateName
}
// ExternalAgentReadyState is the state of an agent that reported ready to the platform
type ExternalAgentReadyState struct {
disallowEverything
agent *ExternalAgent
}
// ExitError signals that agent provided unrecoverable error description
func (s *ExternalAgentReadyState) ExitError(errorType string) error {
s.agent.setStateUnsafe(s.agent.ExitErrorState)
s.agent.errorType = errorType
return nil
}
// Name return state's human friendly name
func (s *ExternalAgentReadyState) Name() string {
return AgentReadyStateName
}
// ExternalAgentRunningState is the state of an agent that has received an invoke event and is currently processing it
type ExternalAgentRunningState struct {
disallowEverything
agent *ExternalAgent
invokeFlow InvokeFlowSynchronization
}
// Ready - agent transitions to Ready and the calling thread gets suspended. Upon release the agent transitions to Running
func (s *ExternalAgentRunningState) Ready() error {
s.agent.setStateUnsafe(s.agent.ReadyState)
s.invokeFlow.AgentReady()
s.agent.ManagedThread.SuspendUnsafe()
if s.agent.currentState != s.agent.ReadyState {
return ErrConcurrentStateModification
}
s.agent.setStateUnsafe(s.agent.RunningState)
return nil
}
// ExitError signals that agent provided unrecoverable error description
func (s *ExternalAgentRunningState) ExitError(errorType string) error {
s.agent.setStateUnsafe(s.agent.ExitErrorState)
s.agent.errorType = errorType
return nil
}
// ShutdownFailed transitions agent into the ShutdownFailed terminal state
func (s *ExternalAgentRunningState) ShutdownFailed() error {
s.agent.setStateUnsafe(s.agent.ShutdownFailedState)
return nil
}
// Exited - agent process has exited
func (s *ExternalAgentRunningState) Exited() error {
s.agent.setStateUnsafe(s.agent.ExitedState)
return nil
}
// Name return state's human friendly name
func (s *ExternalAgentRunningState) Name() string {
return AgentRunningStateName
}
// ExternalAgentInitErrorState is a terminal state where agent has reported /init/error
type ExternalAgentInitErrorState struct {
disallowEverything
}
// Name return state's human friendly name
func (s *ExternalAgentInitErrorState) Name() string {
return AgentInitErrorStateName
}
// InitError - multiple calls are allowed, but only the first submitted error is accepted
func (s *ExternalAgentInitErrorState) InitError(errorType string) error {
// no-op
return nil
}
// ExternalAgentExitErrorState is a terminal state where agent has reported /exit/error
type ExternalAgentExitErrorState struct {
disallowEverything
}
// Name return state's human friendly name
func (s *ExternalAgentExitErrorState) Name() string {
return AgentExitErrorStateName
}
// ExitError - multiple calls are allowed, but only the first submitted error is accepted
func (s *ExternalAgentExitErrorState) ExitError(errorType string) error {
// no-op
return nil
}
type ExternalAgentShutdownFailedState struct {
disallowEverything
}
// Name return state's human friendly name
func (s *ExternalAgentShutdownFailedState) Name() string {
return AgentShutdownFailedStateName
}
type ExternalAgentExitedState struct {
disallowEverything
}
// Name return state's human friendly name
func (s *ExternalAgentExitedState) Name() string {
return AgentExitedStateName
}
type ExternalAgentLaunchErrorState struct {
disallowEverything
}
// Name return state's human friendly name
func (s *ExternalAgentLaunchErrorState) Name() string {
return AgentLaunchErrorName
}