add http backend

README.md

@@ -209,11 +209,46 @@ terraform init -reconfigure \
 ```
 
 Terrawrap configures the backend by looking for `.tf_wrapper` files in the directory structure. 
-Either `s3` or `gcs` are supported. See the relevant Terraform documentation for the options available
+Either `http`, `s3` or `gcs` are supported. See the relevant Terraform documentation for the options available
 for each type of backend: 
+
+<https://www.terraform.io/docs/backends/types/http.html#configuration-variables>
 <https://www.terraform.io/docs/backends/types/s3.html#configuration-variables>
 <https://www.terraform.io/docs/backends/types/gcs.html#configuration-variables>
 
+#### http Backend
+```yml
+backends:
+    http:
+        address:
+        lock_address:
+        lock_method:
+        unlock_address:
+        unlock_method:
+        username:
+        password:
+        skip_cert_verification:
+        retry_max:
+        retry_wait_min:
+        retry_wait_max:
+```
+
+| Option Name            | Required | Purpose                                                                          |
+| -----------------------| -------- | -------------------------------------------------------------------------------- |
+| address                | Yes      | Address of the REST endpoint                                                     |
+| update_method          | No       | HTTP method to use when updating state. Defaults to POST                         |
+| lock_address           | No       | Address of the lock REST endpoint. Defaults to disabled                          |
+| lock_method            | No       | HTTP method to use when locking. Defaults to LOCK                                |
+| unlock_address         | No       | Address of the unlock REST endpoint. Defaults to disabled                        |
+| unlock_method          | No       | HTTP method to use when unlocking. Defaults to UNLOCK                            |
+| username               | No       | Username for HTTP basic authentication                                           |
+| password               | No       | Password for HTTP basic authentication                                           |
+| skip_cert_verification | No       | Whether to skip TLS verification. Defaults to false                              |
+| retry_max              | No       | Number of HTTP request retires. Defaults to 2                                    |
+| retry_wait_min         | No       | Minimum time in seconds to wait between HTTP request attempts. Defaults to 1     |
+| retry_wait_max         | No       | Maximum time in seconds to wait between HTTP request attempts. Defaults to 30    |
+
+
 #### S3 Backend
 ```yml
 backends:

requirements.pip

@@ -4,11 +4,11 @@ amplify-aws-utils>=0.1.2
 docopt==0.6.2
 filelock>=3.0.12,<4
 gitpython>=2.1.10
-PyYAML>=5.3.1,<6
+PyYAML>=6.0.1,<7
 ssm-cache>=2.7,<3
 jsons>=1.0.0,<2.0.0
 python-hcl2>=3,<4
 # Packaging does not obey semver
-packaging==19.1
+packaging
 diskcache>=5.0.0,<6
 networkx>=2.4

terrawrap/models/wrapper_config.py

@@ -36,6 +36,36 @@ def __init__(self):
         super().__init__(EnvVarSource.UNSET)
 
 
+class HTTPBackendConfig:
+    def __init(
+            self,
+            address: str = None,
+            update_method: str = None,
+            lock_address: str = None,
+            lock_method: str = None,
+            unlock_address: str = None,
+            unlock_method: str = None,
+            username: str = None,
+            password: str = None,
+            skip_cert_verification: str = None,
+            retry_max: str = None,
+            retry_wait_min: str = None,
+            retry_wait_max: str = None,
+    ):
+        self.address = address
+        self.update_method = update_method
+        self.lock_address = lock_address
+        self.lock_method = lock_method
+        self.unlock_address = unlock_address
+        self.unlock_method = unlock_method
+        self.username = username
+        self.password = password
+        self.skip_cert_verifications = skip_cert_verification
+        self.retry_max = retry_max
+        self.retry_wait_min = retry_wait_min
+        self.retry_wait_max = retry_wait_max
+
+
 class S3BackendConfig:
     def __init__(
             self,
@@ -57,7 +87,8 @@ def __init__(self, bucket: str = None):
 
 class BackendsConfig:
     # pylint: disable=invalid-name
-    def __init__(self, s3: Optional[S3BackendConfig] = None, gcs: Optional[GCSBackendConfig] = None):
+    def __init__(self, s3: Optional[S3BackendConfig] = None, gcs: Optional[GCSBackendConfig] = None, http: Optional[HTTPBackendConfig] = None):
+        self.http = http
         self.s3 = s3
         self.gcs = gcs
 

terrawrap/utils/config.py

@@ -325,6 +325,8 @@ def calc_backend_config(
             wrapper_options['prefix'] = repo_path
         if existing_backend_config.s3 is not None and wrapper_config.backends.s3 is not None:
             wrapper_options = vars(wrapper_config.backends.s3)
+        if existing_backend_config.http is None and wrapper_config.backends.http is not None:
+            wrapper_options = vars(wrapper_config.backends.http)
         options.update({key: value for key, value in wrapper_options.items() if value is not None})
 
     backend_config.extend([f'-backend-config={key}={value}' for key, value in options.items()])