First round of changes to the EIP module to get it to be able to work well inside a VPC, and to be able to delete EIPs as well

cloud/ec2_eip

@@ -47,6 +47,11 @@ options:
     required: false
     default: null
     aliases: [ ec2_region ]
+  in_vpc:
+    description:
+      - allocate an EIP inside a VPC or not
+    required: false
+    default: false
 requirements: [ "boto" ]
 author: Lorin Hochstein <lorin@nimbisservices.com>
 notes:
@@ -81,6 +86,11 @@ EXAMPLES = '''
   ec2_eip: "instance_id={{ item }}"
   with_items: ec2.instance_ids
 
+- name: allocate a new elastic IP inside a VPC in us-west-2
+  ec2_eip: region=us-west-2 in_vpc=yes
+  register: eip
+- name: output the IP
+  debug: msg="Allocated IP inside a VPC is {{ eip.public_ip }}"
 '''
 
 try:
@@ -122,23 +132,30 @@ def connect(ec2_url, ec2_secret_key, ec2_access_key, region):
     return ec2
 
 
-def associate_ip_and_instance(ec2, public_ip, instance_id, module):
-    if ip_is_associated_with_instance(ec2, public_ip, instance_id):
-        module.exit_json(changed=False, public_ip=public_ip)
+def associate_ip_and_instance(ec2, address, instance_id, module):
+    if ip_is_associated_with_instance(ec2, address.public_ip, instance_id, module):
+        module.exit_json(changed=False, public_ip=address.public_ip)
 
     # If we're in check mode, nothing else to do
     if module.check_mode:
         module.exit_json(changed=True)
 
-    res = ec2.associate_address(instance_id, public_ip)
+    try:
+        if address.domain == "vpc":
+            res = ec2.associate_address(instance_id, allocation_id=address.allocation_id)
+        else:
+            res = ec2.associate_address(instance_id, public_ip=address.public_ip)
+    except boto.exception.EC2ResponseError, e:
+        module.fail_json(msg=str(e))
+    
     if res:
-        module.exit_json(changed=True, public_ip=public_ip)
+        module.exit_json(changed=True, public_ip=address.public_ip)
     else:
         module.fail_json(msg="association failed")
 
 
 def disassociate_ip_and_instance(ec2, public_ip, instance_id, module):
-    if not ip_is_associated_with_instance(ec2, public_ip, instance_id):
+    if not ip_is_associated_with_instance(ec2, public_ip, instance_id, module):
         module.exit_json(changed=False, public_ip=public_ip)
 
     # If we're in check mode, nothing else to do
@@ -152,25 +169,68 @@ def disassociate_ip_and_instance(ec2, public_ip, instance_id, module):
         module.fail_json(msg="disassociation failed")
 
 
-def ip_is_associated_with_instance(ec2, public_ip, instance_id):
+def find_address(ec2, public_ip, module):
+    """ Find an existing Elastic IP address """
+    
+    try:
+        addresses = ec2.get_all_addresses([public_ip])
+    except boto.exception.EC2ResponseError, e:
+        module.fail_json(msg=str(e.message))
+        
+    return addresses[0]
+
+
+def ip_is_associated_with_instance(ec2, public_ip, instance_id, module):
     """ Check if the elastic IP is currently associated with the instance """
-    addresses = ec2.get_all_addresses([public_ip])
-    if addresses:
-        return addresses[0].instance_id == instance_id
+    address = find_address(ec2, public_ip, module)
+    if address:
+        return address.instance_id == instance_id
     else:
         return False
 
 
-def allocate_new_ip(ec2, module):
-    """ Allocate a new elastic IP and return the IP address"""
+def allocate_address(ec2, domain, module):
+    """ Allocate a new elastic IP address and return it """
     # If we're in check mode, nothing else to do
     if module.check_mode:
         module.exit_json(change=True)
 
-    ec2_address = ec2.allocate_address()
-    return ec2_address.public_ip
+    address = ec2.allocate_address(domain=domain)
+    return address
 
 
+def release_address(ec2, public_ip, module):
+    """ Release a previously allocated elastic IP address """
+    
+    address = find_address(ec2, public_ip, module)
+    
+    # If we're in check mode, nothing else to do
+    if module.check_mode:
+        module.exit_json(change=True)
+    
+    res = address.release()    
+    if res:
+        module.exit_json(changed=True)
+    else:
+        module.fail_json(msg="release failed")
+
+
+def find_instance(ec2, instance_id, module):
+    """ Attempt to find the EC2 instance and return it """
+    
+    try:
+        reservations = ec2.get_all_reservations(instance_ids=[instance_id])
+    except boto.exception.EC2ResponseError, e:
+        module.fail_json(msg=str(e))
+    
+    if len(reservations) == 1:
+        instances = reservations[0].instances
+        if len(instances) == 1:
+            return instances[0]
+    
+    module.fail_json(msg="could not find instance" + instance_id)
+    
+
 def main():
     module = AnsibleModule(
         argument_spec = dict(
@@ -181,7 +241,8 @@ def main():
             ec2_url = dict(required=False, aliases=['EC2_URL']),
             ec2_secret_key = dict(required=False, aliases=['EC2_SECRET_KEY'], no_log=True),
             ec2_access_key = dict(required=False, aliases=['EC2_ACCESS_KEY']),
-            region = dict(required=False, aliases=['ec2_region'])
+            region = dict(required=False, aliases=['ec2_region']),
+            in_vpc = dict(required=False, choices=BOOLEANS, default=False),
         ),
         supports_check_mode=True
     )
@@ -197,15 +258,28 @@ def main():
     instance_id = module.params.get('instance_id')
     public_ip = module.params.get('public_ip')
     state = module.params.get('state')
+    in_vpc = module.params.get('in_vpc')
+    domain  = "vpc" if in_vpc else None
 
     if state == 'present':
         if public_ip is None:
-            public_ip = allocate_new_ip(ec2, module)
             if instance_id is None:
-                module.exit_json(changed=True, public_ip=public_ip)
-        associate_ip_and_instance(ec2, public_ip, instance_id, module)
+                address = allocate_address(ec2, domain, module)
+                module.exit_json(changed=True, public_ip=address.public_ip)
+            else:
+                # Determine if the instance is inside a VPC or not
+                instance = find_instance(ec2, instance_id, module)
+                if instance.vpc_id != None:
+                    domain = "vpc"
+                address = allocate_address(ec2, domain, module)
+        else:
+            address = find_address(ec2, public_ip, module)
+        associate_ip_and_instance(ec2, address, instance_id, module)
     else:
-        disassociate_ip_and_instance(ec2, public_ip, instance_id, module)
+        if instance_id is None:
+            release_address(ec2, public_ip, module)
+        else:
+            disassociate_ip_and_instance(ec2, public_ip, instance_id, module)