[Block Device] Add block device mapping to launch config backend

moto/autoscaling/responses.py

@@ -1,6 +1,7 @@
 from jinja2 import Template
 
 from moto.core.responses import BaseResponse
+from moto.core.utils import camelcase_to_underscores
 from .models import autoscaling_backend
 
 
@@ -17,6 +18,21 @@ class AutoScalingResponse(BaseResponse):
     def _get_multi_param(self, param_prefix):
         return [value[0] for key, value in self.querystring.items() if key.startswith(param_prefix)]
 
+    def _get_list_prefix(self, param_prefix):
+        results = []
+        param_index = 1
+        while True:
+            index_prefix = "{0}.{1}.".format(param_prefix, param_index)
+            new_items = {}
+            for key, value in self.querystring.items():
+                if key.startswith(index_prefix):
+                    new_items[camelcase_to_underscores(key.replace(index_prefix, ""))] = value[0]
+            if not new_items:
+                break
+            results.append(new_items)
+            param_index += 1
+        return results
+
     def create_launch_configuration(self):
         instance_monitoring_string = self._get_param('InstanceMonitoring.Enabled')
         if instance_monitoring_string == 'true':
@@ -35,6 +51,7 @@ class AutoScalingResponse(BaseResponse):
             spot_price=self._get_param('SpotPrice'),
             ebs_optimized=self._get_param('EbsOptimized'),
             associate_public_ip_address=self._get_param("AssociatePublicIpAddress"),
+            block_device_mappings=self._get_list_prefix('BlockDeviceMappings.member')
         )
         template = Template(CREATE_LAUNCH_CONFIGURATION_TEMPLATE)
         return template.render()
@@ -173,7 +190,34 @@ DESCRIBE_LAUNCH_CONFIGURATIONS_TEMPLATE = """<DescribeLaunchConfigurationsRespon
           <InstanceType>m1.small</InstanceType>
           <LaunchConfigurationARN>arn:aws:autoscaling:us-east-1:803981987763:launchConfiguration:
           9dbbbf87-6141-428a-a409-0752edbe6cad:launchConfigurationName/my-test-lc</LaunchConfigurationARN>
-          <BlockDeviceMappings/>
+          {% if launch_configuration.block_device_mappings %}
+            <BlockDeviceMappings>
+            {% for mount_point, mapping in launch_configuration.block_device_mappings.iteritems() %}
+              <member>
+                <DeviceName>{{ mount_point }}</DeviceName>
+                {% if mapping.ephemeral_name %}
+                <VirtualName>{{ mapping.ephemeral_name }}</VirtualName>
+                {% else %}
+                <Ebs>
+                {% if mapping.snapshot_id %}
+                  <SnapshotId>{{ mapping.snapshot_id }}</SnapshotId>
+                {% endif %}
+                {% if mapping.size %}
+                  <VolumeSize>{{ mapping.size }}</VolumeSize>
+                {% endif %}
+                {% if mapping.iops %}
+                  <Iops>{{ mapping.iops }}</Iops>
+                {% endif %}
+                  <DeleteOnTermination>{{ mapping.delete_on_termination }}</DeleteOnTermination>
+                  <VolumeType>{{ mapping.volume_type }}</VolumeType>
+                </Ebs>
+                {% endif %}
+              </member>
+            {% endfor %}
+            </BlockDeviceMappings>
+          {% else %}
+            <BlockDeviceMappings/>
+          {% endif %}
           <ImageId>{{ launch_configuration.image_id }}</ImageId>
           {% if launch_configuration.key_name %}
             <KeyName>{{ launch_configuration.key_name }}</KeyName>