Step Functions - basic method implementation

IMPLEMENTATION_COVERAGE.md

@@ -6050,24 +6050,24 @@
 ## stepfunctions
 0% implemented
 - [ ] create_activity
-- [ ] create_state_machine
+- [X] create_state_machine
 - [ ] delete_activity
-- [ ] delete_state_machine
+- [X] delete_state_machine
 - [ ] describe_activity
-- [ ] describe_execution
-- [ ] describe_state_machine
-- [ ] describe_state_machine_for_execution
+- [X] describe_execution
+- [X] describe_state_machine
+- [x] describe_state_machine_for_execution
 - [ ] get_activity_task
 - [ ] get_execution_history
 - [ ] list_activities
-- [ ] list_executions
-- [ ] list_state_machines
-- [ ] list_tags_for_resource
+- [X] list_executions
+- [X] list_state_machines
+- [X] list_tags_for_resource
 - [ ] send_task_failure
 - [ ] send_task_heartbeat
 - [ ] send_task_success
-- [ ] start_execution
-- [ ] stop_execution
+- [X] start_execution
+- [X] stop_execution
 - [ ] tag_resource
 - [ ] untag_resource
 - [ ] update_state_machine

docs/index.rst

@@ -94,6 +94,8 @@ Currently implemented Services:
 +---------------------------+-----------------------+------------------------------------+
 | SES                       | @mock_ses             | all endpoints done                 |
 +---------------------------+-----------------------+------------------------------------+
+| SFN                       | @mock_stepfunctions   | basic endpoints done               |
++---------------------------+-----------------------+------------------------------------+
 | SNS                       | @mock_sns             | all endpoints done                 |
 +---------------------------+-----------------------+------------------------------------+
 | SQS                       | @mock_sqs             | core endpoints done                |

moto/__init__.py

@@ -42,6 +42,7 @@
 from .secretsmanager import mock_secretsmanager  # flake8: noqa
 from .sns import mock_sns, mock_sns_deprecated  # flake8: noqa
 from .sqs import mock_sqs, mock_sqs_deprecated  # flake8: noqa
+from .stepfunctions import mock_stepfunctions # flake8: noqa
 from .sts import mock_sts, mock_sts_deprecated  # flake8: noqa
 from .ssm import mock_ssm  # flake8: noqa
 from .route53 import mock_route53, mock_route53_deprecated  # flake8: noqa

moto/backends.py

@@ -40,6 +40,7 @@
 from moto.sns import sns_backends
 from moto.sqs import sqs_backends
 from moto.ssm import ssm_backends
+from moto.stepfunctions import stepfunction_backends
 from moto.sts import sts_backends
 from moto.swf import swf_backends
 from moto.xray import xray_backends
@@ -91,6 +92,7 @@
     'sns': sns_backends,
     'sqs': sqs_backends,
     'ssm': ssm_backends,
+    'stepfunctions': stepfunction_backends,
     'sts': sts_backends,
     'swf': swf_backends,
     'route53': route53_backends,

moto/stepfunctions/__init__.py

@@ -0,0 +1,6 @@
+from __future__ import unicode_literals
+from .models import stepfunction_backends
+from ..core.models import base_decorator
+
+stepfunction_backend = stepfunction_backends['us-east-1']
+mock_stepfunctions = base_decorator(stepfunction_backends)

moto/stepfunctions/exceptions.py

@@ -0,0 +1,35 @@
+from __future__ import unicode_literals
+import json
+
+
+class AWSError(Exception):
+    TYPE = None
+    STATUS = 400
+
+    def __init__(self, message, type=None, status=None):
+        self.message = message
+        self.type = type if type is not None else self.TYPE
+        self.status = status if status is not None else self.STATUS
+
+    def response(self):
+        return json.dumps({'__type': self.type, 'message': self.message}), dict(status=self.status)
+
+
+class ExecutionDoesNotExist(AWSError):
+    TYPE = 'ExecutionDoesNotExist'
+    STATUS = 400
+
+
+class InvalidArn(AWSError):
+    TYPE = 'InvalidArn'
+    STATUS = 400
+
+
+class InvalidName(AWSError):
+    TYPE = 'InvalidName'
+    STATUS = 400
+
+
+class StateMachineDoesNotExist(AWSError):
+    TYPE = 'StateMachineDoesNotExist'
+    STATUS = 400

moto/stepfunctions/models.py

@@ -0,0 +1,162 @@
+import boto
+import re
+from datetime import datetime
+from moto.core import BaseBackend
+from moto.core.utils import iso_8601_datetime_without_milliseconds
+from moto.sts.models import ACCOUNT_ID
+from uuid import uuid4
+from .exceptions import ExecutionDoesNotExist, InvalidArn, InvalidName, StateMachineDoesNotExist
+
+
+class StateMachine():
+    def __init__(self, arn, name, definition, roleArn, tags=None):
+        self.creation_date = iso_8601_datetime_without_milliseconds(datetime.now())
+        self.arn = arn
+        self.name = name
+        self.definition = definition
+        self.roleArn = roleArn
+        self.tags = tags
+
+
+class Execution():
+    def __init__(self, region_name, account_id, state_machine_name, execution_name, state_machine_arn):
+        execution_arn = 'arn:aws:states:{}:{}:execution:{}:{}'
+        execution_arn = execution_arn.format(region_name, account_id, state_machine_name, execution_name)
+        self.execution_arn = execution_arn
+        self.name = execution_name
+        self.start_date = iso_8601_datetime_without_milliseconds(datetime.now())
+        self.state_machine_arn = state_machine_arn
+        self.status = 'RUNNING'
+        self.stop_date = None
+
+    def stop(self):
+        self.status = 'SUCCEEDED'
+        self.stop_date = iso_8601_datetime_without_milliseconds(datetime.now())
+
+
+class StepFunctionBackend(BaseBackend):
+
+    # https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/stepfunctions.html#SFN.Client.create_state_machine
+    # A name must not contain:
+    # whitespace
+    # brackets < > { } [ ]
+    # wildcard characters ? *
+    # special characters " # % \ ^ | ~ ` $ & , ; : /
+    invalid_chars_for_name = [' ', '{', '}', '[', ']', '<', '>',
+                              '?', '*',
+                              '"', '#', '%', '\\', '^', '|', '~', '`', '$', '&', ',', ';', ':', '/']
+    # control characters (U+0000-001F , U+007F-009F )
+    invalid_unicodes_for_name = [u'\u0000', u'\u0001', u'\u0002', u'\u0003', u'\u0004',
+                                 u'\u0005', u'\u0006', u'\u0007', u'\u0008', u'\u0009',
+                                 u'\u000A', u'\u000B', u'\u000C', u'\u000D', u'\u000E', u'\u000F',
+                                 u'\u0010', u'\u0011', u'\u0012', u'\u0013', u'\u0014',
+                                 u'\u0015', u'\u0016', u'\u0017', u'\u0018', u'\u0019',
+                                 u'\u001A', u'\u001B', u'\u001C', u'\u001D', u'\u001E', u'\u001F',
+                                 u'\u007F',
+                                 u'\u0080', u'\u0081', u'\u0082', u'\u0083', u'\u0084', u'\u0085',
+                                 u'\u0086', u'\u0087', u'\u0088', u'\u0089',
+                                 u'\u008A', u'\u008B', u'\u008C', u'\u008D', u'\u008E', u'\u008F',
+                                 u'\u0090', u'\u0091', u'\u0092', u'\u0093', u'\u0094', u'\u0095',
+                                 u'\u0096', u'\u0097', u'\u0098', u'\u0099',
+                                 u'\u009A', u'\u009B', u'\u009C', u'\u009D', u'\u009E', u'\u009F']
+    accepted_role_arn_format = re.compile('arn:aws:iam:(?P<account_id>[0-9]{12}):role/.+')
+    accepted_mchn_arn_format = re.compile('arn:aws:states:[-0-9a-zA-Z]+:(?P<account_id>[0-9]{12}):stateMachine:.+')
+    accepted_exec_arn_format = re.compile('arn:aws:states:[-0-9a-zA-Z]+:(?P<account_id>[0-9]{12}):execution:.+')
+
+    def __init__(self, region_name):
+        self.state_machines = []
+        self.executions = []
+        self.region_name = region_name
+        self._account_id = None
+
+    def create_state_machine(self, name, definition, roleArn, tags=None):
+        self._validate_name(name)
+        self._validate_role_arn(roleArn)
+        arn = 'arn:aws:states:' + self.region_name + ':' + str(self._get_account_id()) + ':stateMachine:' + name
+        try:
+            return self.describe_state_machine(arn)
+        except StateMachineDoesNotExist:
+            state_machine = StateMachine(arn, name, definition, roleArn, tags)
+            self.state_machines.append(state_machine)
+            return state_machine
+
+    def list_state_machines(self):
+        return self.state_machines
+
+    def describe_state_machine(self, arn):
+        self._validate_machine_arn(arn)
+        sm = next((x for x in self.state_machines if x.arn == arn), None)
+        if not sm:
+            raise StateMachineDoesNotExist("State Machine Does Not Exist: '" + arn + "'")
+        return sm
+
+    def delete_state_machine(self, arn):
+        self._validate_machine_arn(arn)
+        sm = next((x for x in self.state_machines if x.arn == arn), None)
+        if sm:
+            self.state_machines.remove(sm)
+
+    def start_execution(self, state_machine_arn):
+        state_machine_name = self.describe_state_machine(state_machine_arn).name
+        execution = Execution(region_name=self.region_name,
+                              account_id=self._get_account_id(),
+                              state_machine_name=state_machine_name,
+                              execution_name=str(uuid4()),
+                              state_machine_arn=state_machine_arn)
+        self.executions.append(execution)
+        return execution
+
+    def stop_execution(self, execution_arn):
+        execution = next((x for x in self.executions if x.execution_arn == execution_arn), None)
+        if not execution:
+            raise ExecutionDoesNotExist("Execution Does Not Exist: '" + execution_arn + "'")
+        execution.stop()
+        return execution
+
+    def list_executions(self, state_machine_arn):
+        return [execution for execution in self.executions if execution.state_machine_arn == state_machine_arn]
+
+    def describe_execution(self, arn):
+        self._validate_execution_arn(arn)
+        exctn = next((x for x in self.executions if x.execution_arn == arn), None)
+        if not exctn:
+            raise ExecutionDoesNotExist("Execution Does Not Exist: '" + arn + "'")
+        return exctn
+
+    def reset(self):
+        region_name = self.region_name
+        self.__dict__ = {}
+        self.__init__(region_name)
+
+    def _validate_name(self, name):
+        if any(invalid_char in name for invalid_char in self.invalid_chars_for_name):
+            raise InvalidName("Invalid Name: '" + name + "'")
+
+        if any(name.find(char) >= 0 for char in self.invalid_unicodes_for_name):
+            raise InvalidName("Invalid Name: '" + name + "'")
+
+    def _validate_role_arn(self, role_arn):
+        self._validate_arn(arn=role_arn,
+                           regex=self.accepted_role_arn_format,
+                           invalid_msg="Invalid Role Arn: '" + role_arn + "'")
+
+    def _validate_machine_arn(self, machine_arn):
+        self._validate_arn(arn=machine_arn,
+                           regex=self.accepted_mchn_arn_format,
+                           invalid_msg="Invalid Role Arn: '" + machine_arn + "'")
+
+    def _validate_execution_arn(self, execution_arn):
+        self._validate_arn(arn=execution_arn,
+                           regex=self.accepted_exec_arn_format,
+                           invalid_msg="Execution Does Not Exist: '" + execution_arn + "'")
+
+    def _validate_arn(self, arn, regex, invalid_msg):
+        match = regex.match(arn)
+        if not arn or not match:
+            raise InvalidArn(invalid_msg)
+
+    def _get_account_id(self):
+        return ACCOUNT_ID
+
+
+stepfunction_backends = {_region.name: StepFunctionBackend(_region.name) for _region in boto.awslambda.regions()}