Add support for terraform packaging

Squashed commit of the following:

commit 9ea78cba5919fab817efa22752974ab1cc70ce9c
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Fri Aug 2 17:14:52 2019 -0400

    terraform-package rebase 1

commit a4936fc
Merge: 22a3463 60d0217
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Fri Aug 2 13:28:19 2019 -0400

    terraform support, merge upstream and resolve conflicts

commit 22a3463
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Fri Aug 2 08:44:20 2019 -0400

    terraform packaging, explicit error message on websocket support

commit 50d1880
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Thu Aug 1 17:15:29 2019 -0400

    terraform support, handle a tf ref for bucket notifications

commit 6cf5a54
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Thu Aug 1 09:32:29 2019 -0400

    terraform packaging test with private api gateway resource and min compression size

commit 77d4840
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Wed Jul 31 17:54:37 2019 -0400

    fix tests and lint

commit b3e324b
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Wed Jul 31 14:44:46 2019 -0400

    terraform support, address review comments

commit 124f3d9
Merge: 373d2f3 bd7fa76
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Tue Jul 30 10:00:53 2019 -0400

    Merge branch 'upstream' into terraform-package

commit 373d2f3
Merge: 8fbd4b1 4853c6c
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Thu Jun 20 16:08:07 2019 -0400

    Merge branch 'upstream' into terraform-package

commit 8fbd4b1
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Fri Jun 7 10:52:21 2019 -0400

    update sam layer gen to new generator interface

commit cbc4a64
Merge: 3084852 07ca537
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Fri Jun 7 10:41:24 2019 -0400

    Merge branch 'upstream' into terraform-package

commit 07ca537
Merge: 4f8ddd0 31acf9e
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Thu Jun 6 13:01:32 2019 -0400

    Merge branch 'master' of https://github.com/aws/chalice into upstream

commit 3084852
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Thu Jun 6 12:53:40 2019 -0400

    address review comments on docs

commit 0fd9d87
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Tue Jun 4 14:19:44 2019 -0400

    test default generator method

commit 2dd988a
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Tue Jun 4 14:05:43 2019 -0400

    relax terraform version requirement

commit cf2a95a
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Mon Jun 3 19:10:35 2019 -0400

    add layer support

commit 4f8ddd0
Author: Kapil Thangavelu <kapilt@gmail.com>
Date:   Sat May 25 07:32:14 2019 -0400

    cli package terraform support

CHANGELOG.rst

@@ -13,6 +13,8 @@ Next Release (TBD)
   (`#1160 https://github.com/aws/chalice/pull/1160`__)
 * Add --merge-template option to package command
   (`#1195 https://github.com/aws/chalice/pull/1195`__)
+* Add support for packaging via terraform
+  (`#1129 https://github.com/aws/chalice/pull/1129`__)
 
 
 1.9.1

chalice/cli/__init__.py

@@ -368,29 +368,41 @@ def generate_sdk(ctx, sdk_type, stage, outdir):
 
 
 @cli.command('package')
+@click.option('--pkg-format', default='cloudformation',
+              help=('Specify the provisioning engine to use for '
+                    'template output. Chalice supports both '
+                    'CloudFormation and Terraform. Default '
+                    'is CloudFormation.'),
+              type=click.Choice(['cloudformation', 'terraform']))
+@click.option('--stage', default=DEFAULT_STAGE_NAME,
+              help="Chalice Stage to package.")
 @click.option('--single-file', is_flag=True,
               default=False,
               help=("Create a single packaged file. "
                     "By default, the 'out' argument "
                     "specifies a directory in which the "
                     "package assets will be placed.  If "
                     "this argument is specified, a single "
-                    "zip file will be created instead."))
-@click.option('--stage', default=DEFAULT_STAGE_NAME)
+                    "zip file will be created instead. CloudFormation Only."))
 @click.option('--merge-template',
               help=('Specify a JSON template to be merged '
                     'into the generated template. This is useful '
                     'for adding resources to a Chalice template or '
-                    'modify values in the template.'))
+                    'modify values in the template. CloudFormation Only.'))
 @click.argument('out')
 @click.pass_context
-def package(ctx, single_file, stage, merge_template, out):
-    # type: (click.Context, bool, str, str, str) -> None
+def package(ctx, single_file, stage, merge_template,
+            out, pkg_format):
+    # type: (click.Context, bool, str, str, str, str) -> None
     factory = ctx.obj['factory']  # type: CLIFactory
-    config = factory.create_config_obj(
-        chalice_stage_name=stage,
-    )
-    packager = factory.create_app_packager(config, merge_template)
+    config = factory.create_config_obj(stage)
+    packager = factory.create_app_packager(config, pkg_format, merge_template)
+    if pkg_format == 'terraform' and (merge_template or single_file):
+        click.echo((
+            "Terraform format does not support "
+            "merge-template or single-file options"))
+        raise click.Abort()
+
     if single_file:
         dirname = tempfile.mkdtemp()
         try:

chalice/cli/factory.py

@@ -179,9 +179,10 @@ def _validate_config_from_disk(self, config):
         except ValueError:
             raise UnknownConfigFileVersion(string_version)
 
-    def create_app_packager(self, config, merge_template=None):
-        # type: (Config, OptStr) -> AppPackager
-        return create_app_packager(config, merge_template=merge_template)
+    def create_app_packager(self, config, package_format, merge_template=None):
+        # type: (Config, str, OptStr) -> AppPackager
+        return create_app_packager(
+            config, package_format, merge_template=merge_template)
 
     def create_log_retriever(self, session, lambda_arn):
         # type: (Session, str) -> LogRetriever

chalice/deploy/swagger.py

@@ -286,3 +286,18 @@ def _auth_uri(self, authorizer):
             '/functions/{%s}/invocations' % varname,
             ['region_name', varname],
         )
+
+
+class TerraformSwaggerGenerator(SwaggerGenerator):
+
+    def __init__(self):
+        # type: () -> None
+        pass
+
+    def _uri(self, lambda_arn=None):
+        # type: (Optional[str]) -> Any
+        return '${aws_lambda_function.api_handler.invoke_arn}'
+
+    def _auth_uri(self, authorizer):
+        # type: (ChaliceAuthorizer) -> Any
+        return '${aws_lambda_function.%s.invoke_arn}' % (authorizer.name)