def branch_retry_parallel_state_example():
finally_state = awssl.Pass(
Name="MyFinally",
Comment=
"This is the branch to execute as a 'finally' statement to the Parallel state",
ResultAsJSON={"Finally": "Completed"},
EndState=True)
# Create the branch processing to be performed - in this case returning the name of the StartState
p1 = awssl.Pass(Name="Dummy1",
EndState=True,
ResultAsJSON={"Value": "Dummy1"})
p2 = awssl.Pass(Name="Dummy2",
EndState=True,
ResultAsJSON={"Value": "Dummy2"})
p3 = awssl.Pass(Name="Dummy3",
EndState=True,
ResultAsJSON={"Value": "Dummy3"})
# Attempt to retry any branch error using the defaults
r = awssl.Retrier(ErrorNameList=["States.ALL"])
# Run the branches in parallel, each having an individual retrier on any error returned
para = awssl.ext.BranchRetryParallel(Name="MyParallel",
BranchList=[p1, p2, p3],
BranchRetryList=[r],
FinallyState=finally_state,
EndState=True)
# Construct state machine
sm = awssl.StateMachine(Comment="This is a test", StartState=para)
return sm
def limit_parallel_with_branch_retry_example(iterations, max_concurrency): # Declare the Arns for the Lambda functions required by awssl.ext.For awssl.ext.set_ext_arns( ForInitializer="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", ForExtractor="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", ForConsolidator="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", ForFinalizer="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", ForFinalizerParallelIterations="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", LimitedParallelConsolidator="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME") # Create the branch of concurrent processing to be performed - in this case extraction of the iteration value p = awssl.Pass(Name="Dummy", EndState=True, OutputPath="$.iteration.Iteration") # This example is identifical to limit_parallel_example, except that retriers are going to be added # for the branch executions r1 = awssl.Retrier(ErrorNameList=["MyError", "MyOtherError"]) r2 = awssl.Retrier(ErrorNameList=["States.ALL"]) # Sometimes we want to throttle concurrent processing - for example to prevent Lambda function throttling # awssl.ext.LimitedParallel can limit the number of concurrent branches being processed at any given time parallel = awssl.ext.LimitedParallel( Name="LimitedParallel", EndState=True, Iterations=iterations, IteratorPath="$.iteration", MaxConcurrency=max_concurrency, BranchState=p, BranchRetryList=[r1, r2]) # Construct state machine sm = awssl.StateMachine(Comment="This is a test") sm.set_start_state(parallel) return sm
def parallel_example(): # Construct states for each branch branch1 = awssl.Wait( Name="Wait 20s", WaitForSeconds=20, EndState=True) wait_10s = awssl.Wait( Name="Wait 10s", WaitForSeconds=10, EndState=True) branch2 = awssl.Pass( Name="Pass", NextState=wait_10s) # Construct states for main branch final_state = awssl.Pass( Name="Final State", EndState=True) parallel = awssl.Parallel( Name="Parallel", NextState=final_state, EndState=False, BranchList=[branch1, branch2]) # Construct state machine return awssl.StateMachine( Comment="An example of the Amazon States Language using a parallel state to execute two branches at the same time.", StartState=parallel)
def limit_parallel_example(iterations, max_concurrency):
# Declare the Arns for the Lambda functions required by awssl.ext.For
awssl.ext.set_ext_arns(
ForInitializer=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForExtractor="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForConsolidator=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForFinalizer="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForFinalizerParallelIterations=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
LimitedParallelConsolidator=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME")
# Create the branch of concurrent processing to be performed - in this case extraction of the iteration value
p = awssl.Pass(Name="Dummy",
EndState=True,
OutputPath="$.iteration.Iteration")
# Sometimes we want to throttle concurrent processing - for example to prevent Lambda function throttling
# awssl.ext.LimitedParallel can limit the number of concurrent branches being processed at any given time
parallel = awssl.ext.LimitedParallel(Name="LimitedParallel",
EndState=True,
Iterations=iterations,
IteratorPath="$.iteration",
MaxConcurrency=max_concurrency,
BranchState=p)
# Construct state machine
sm = awssl.StateMachine(Comment="This is a test")
sm.set_start_state(parallel)
return sm
def choice_example(): # Construct states for each choice default = awssl.Fail( Name="Default", ErrorCause="No Matches!") next_state = awssl.Task( Name="NextState", ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", EndState=True) first_match_state = awssl.Task( Name="FirstMatchState", ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", EndState=False, NextState=next_state) second_match_state = awssl.Task( Name="SecondMatchState", ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", EndState=False, NextState=next_state) # Construct Choice Rules first_rule = awssl.ChoiceRule( Comparison=awssl.Comparison( Variable="$.foo", Comparator="NumericEquals", Value=1), NextState=first_match_state) second_rule = awssl.ChoiceRule( Comparison=awssl.Comparison( Variable="$.foo", Comparator="NumericEquals", Value=2), NextState=second_match_state) # Construct states for main branch choice_state = awssl.Choice( Name="ChoiceState", ChoiceList=[first_rule, second_rule], Default=default) first_state = awssl.Task( Name="FirstState", ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", EndState=False, NextState=choice_state) # Construct state machine return awssl.StateMachine( Comment="An example of the Amazon States Language using a choice state.", StartState=first_state)
def for_state_example():
# Declare the Arns for the Lambda functions required by awssl.ext.For
awssl.ext.set_ext_arns(
ForInitializer=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForExtractor="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForConsolidator=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForFinalizer="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForFinalizerParallelIterations=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
LimitedParallelConsolidator=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME")
# Create the branch processing to be performed - in this case extraction of the iteration value
p = awssl.Pass(Name="Dummy",
EndState=True,
OutputPath="$.iteration.Iteration")
# Create 3 For instances to demonstrate the different From/To/Step features
# Notice that the same branch definition can be reused across all the For loops
s1 = awssl.ext.For(Name="For1",
EndState=True,
From=0,
To=5,
Step=1,
BranchState=p,
ParallelIteration=True)
s2 = awssl.ext.For(Name="For2",
EndState=True,
From=0,
To=8,
Step=2,
BranchState=p,
ParallelIteration=True)
s3 = awssl.ext.For(Name="For3",
EndState=True,
From=-16,
To=16,
Step=2,
BranchState=p)
# Run the For loops in parallel, to demonstrate there is no interdependencies
para = awssl.Parallel(Name="Parallel-Fors",
BranchList=[s1, s2, s3],
EndState=True)
# Construct state machine
sm = awssl.StateMachine(Comment="This is a test")
sm.set_start_state(para)
return sm
def test2(): import awssl # Construct states hello_world = awssl.Pass( Name="HelloWorld", EndState=True) # Construct state machine return awssl.StateMachine( Comment="A Hello World example of the Amazon States Language using a Pass state", StartState=hello_world)
def for_state_example():
# Declare the Arns for the Lambda functions required by awssl.ext.For
awssl.ext.set_ext_arns(
ForInitializer=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForExtractor="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForConsolidator=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForFinalizer="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
ForFinalizerParallelIterations=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
LimitedParallelConsolidator=
"arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME")
# Create the branch processing to be performed - in this case extraction of the iteration value
p = awssl.Pass(Name="Dummy",
EndState=True,
OutputPath="$.iteration.Iteration")
r = awssl.Retrier(ErrorNameList=["States.ALL"])
# Create 2 identical For loops - one where the branches are retryable, and one where they aren't
s1 = awssl.ext.For(Name="For1",
EndState=True,
From=0,
To=5,
Step=1,
BranchState=p,
BranchRetryList=[r],
ParallelIteration=True)
s2 = awssl.ext.For(Name="For2",
EndState=True,
From=0,
To=5,
Step=1,
BranchState=p,
ParallelIteration=True)
# Run the For loops in parallel, to demonstrate there is no interdependencies
para = awssl.Parallel(Name="Parallel-Fors",
BranchList=[s1, s2],
EndState=True)
# Construct state machine
sm = awssl.StateMachine(Comment="This is a test")
sm.set_start_state(para)
return sm
def parallel_with_finally_example():
finally_state = awssl.Pass(
Name="Finally",
Comment=
"This is the branch to execute as a 'finally' statement to the Task",
ResultAsJSON={"Finally": "Completed"},
EndState=True)
catch_state_0 = awssl.Pass(
Name="Catcher-MyError",
Comment=
"This is the branch to execute when a 'MyError' error is caught",
ResultAsJSON={"Caught": "Error"},
EndState=True)
catch_state_1 = awssl.Pass(
Name="Catcher-All",
Comment="This is the branch to execute any other error is caught",
ResultAsJSON={"Caught": "Error"},
EndState=True)
branch_list = []
for n in range(1, 6):
branch = awssl.Pass(
Name="Branch {}".format(n),
Comment="This Pass state is an example of a branch",
ResultAsJSON={"Branch": n},
EndState=True)
branch_list.append(branch)
# Construct states
hello_world = awssl.ext.ParallelWithFinally(
Name="HelloWorld",
Comment="This is the actual Parallel to be executed",
BranchList=branch_list,
FinallyState=finally_state,
CatcherList=[
awssl.Catcher(ErrorNameList=["MyError"], NextState=catch_state_0),
awssl.Catcher(ErrorNameList=["States.ALL"],
NextState=catch_state_1)
],
EndState=True)
# Construct state machine
return awssl.StateMachine(
Comment=
"A Parallel finally example, where the finally branch is executed both after successful completion, and before any Catchers are triggered when an error occurs",
StartState=hello_world)
def catch_failure_example():
# Fallback states
reserved_type_fallback = awssl.Pass(
Name="ReservedTypeFallback",
ResultAsJSON={"msg": "This is a fallback from a reserved error code"},
OutputPath="$.msg",
EndState=True)
catch_all_fallback = awssl.Pass(
Name="CatchAllFallback",
ResultAsJSON={"msg": "This is a fallback from a reserved error code"},
OutputPath="$.msg",
EndState=True)
custom_error_fallback = awssl.Pass(
Name="CustomErrorFallback",
ResultAsJSON={
"msg": "This is a fallback from a custom lambda function exception"
},
OutputPath="$.msg",
EndState=True)
# Catchers for the HelloWorld task state
states_all_catcher = awssl.Catcher(ErrorNameList=["States.ALL"],
NextState=catch_all_fallback)
reserved_type_catcher = awssl.Catcher(ErrorNameList=["States.TaskFailed"],
NextState=reserved_type_fallback)
custom_error_catcher = awssl.Catcher(ErrorNameList=["CustomError"],
NextState=custom_error_fallback)
# Construct states
hello_world = awssl.Task(
Name="HelloWorld",
ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
EndState=True,
CatcherList=[
custom_error_catcher, reserved_type_catcher, states_all_catcher
])
# Construct state machine
return awssl.StateMachine(
Comment=
"A Catch example of the Amazon States Language using an AWS Lambda Function",
StartState=hello_world)
def task_with_finally_example():
finally_state = awssl.Pass(
Name="Finally",
Comment=
"This is the branch to execute as a 'finally' statement to the Task",
ResultAsJSON={"Finally": "Completed"},
EndState=True)
catch_state_0 = awssl.Pass(
Name="Catcher-MyError",
Comment=
"This is the branch to execute when a 'MyError' error is caught",
ResultAsJSON={"Caught": "Error"},
EndState=True)
catch_state_1 = awssl.Pass(
Name="Catcher-All",
Comment="This is the branch to execute any other error is caught",
ResultAsJSON={"Caught": "Error"},
EndState=True)
# Construct states
hello_world = awssl.ext.TaskWithFinally(
Name="HelloWorld",
Comment="This is the actual Task to be executed",
ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
FinallyState=finally_state,
CatcherList=[
awssl.Catcher(ErrorNameList=["MyError"], NextState=catch_state_0),
awssl.Catcher(ErrorNameList=["States.ALL"],
NextState=catch_state_1)
],
EndState=True)
# Construct state machine
return awssl.StateMachine(
Comment=
"A Task finally example, where the finally branch is executed both after successful completion, and before any Catchers are triggered when an error occurs",
StartState=hello_world)
def wait_state_example(): # Construct states final_state = awssl.Task( Name="FinalState", EndState=True, ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME") wait_using_seconds_path = awssl.Wait( Name="wait_using_seconds_path", NextState=final_state, WaitForSecondsPath="$.expiryseconds") wait_using_timestamp_path = awssl.Wait( Name="wait_using_timestamp_path", NextState=wait_using_seconds_path, WaitUntilISO8601TimestampPath="$.expirydate") wait_using_timestamp = awssl.Wait( Name="wait_using_timestamp", NextState=wait_using_timestamp_path, WaitUntilISO8601Timestamp="2015-09-04T01:59:00Z") wait_using_seconds = awssl.Wait( Name="wait_using_second", NextState=wait_using_timestamp, WaitForSeconds=10) first_state = awssl.Task( Name="FirstState", ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME", EndState=False, NextState=wait_using_seconds) # Construct state machine return awssl.StateMachine( Comment="An example of the Amazon States Language using wait states", StartState=first_state)
def retry_failure_example():
retrier1 = awssl.Retrier(ErrorNameList=["CustomError"],
IntervalSeconds=1,
MaxAttempts=2,
BackoffRate=2.0)
states_all_retrier = awssl.Retrier(ErrorNameList=["States.ALL"],
IntervalSeconds=5,
MaxAttempts=5,
BackoffRate=2.0)
# Construct states
hello_world = awssl.Task(
Name="HelloWorld",
ResourceArn="arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
EndState=True,
RetryList=[retrier1, states_all_retrier])
# Construct state machine
return awssl.StateMachine(
Comment=
"A Retry example of the Amazon States Language using an AWS Lambda Function",
StartState=hello_world)
def branch_retry_parallel_state_example():
# Create the branch processing to be performed - in this case returning the name of the StartState
p1 = awssl.Pass(Name="Dummy1",
EndState=True,
ResultAsJSON={"Value": "Dummy1"})
p2 = awssl.Pass(Name="Dummy2",
EndState=True,
ResultAsJSON={"Value": "Dummy2"})
p3 = awssl.Pass(Name="Dummy3",
EndState=True,
ResultAsJSON={"Value": "Dummy3"})
r = awssl.Retrier(ErrorNameList=["States.ALL"])
# Run the branches in parallel, each having an individual retrier on any error returned
para = awssl.ext.BranchRetryParallel(Name="Parallel",
BranchList=[p1, p2, p3],
BranchRetryList=[r],
EndState=True)
# Construct state machine
sm = awssl.StateMachine(Comment="This is a test", StartState=para)
return sm