Refactor libpod python varlink bindings

- More pythonic
- Leverage context managers to help with socket leaks
- Add system unittest's
- Add image unittest's
- Add container unittest's
- Add models for system, containers and images, and their collections
- Add helper functions for datetime parsing/formatting
- GetInfo() implemented
- Add support for setuptools
- Update documentation
- Support for Python 3.4-3.6

Signed-off-by: Jhon Honce <jhonce@redhat.com>

Closes: #748
Approved by: baude

1 files changed, 81 insertions, 0 deletions

diff --git a/contrib/python/podman/client.py b/contrib/python/podman/client.py
new file mode 100644
index 000000000..8a1acdd9b
--- /dev/null
+++ b/contrib/python/podman/client.py
@@ -0,0 +1,81 @@
+"""A client for communicating with a Podman varlink service."""
+import contextlib
+import functools
+
+from varlink import Client as VarlinkClient
+from varlink import VarlinkError
+
+from .libs import cached_property
+from .libs.containers import Containers
+from .libs.errors import error_factory
+from .libs.images import Images
+from .libs.system import System
+
+
+class Client(object):
+    """A client for communicating with a Podman varlink service.
+
+    Example:
+
+        >>> import podman
+        >>> c = podman.Client()
+        >>> c.system.versions
+    """
+
+    # TODO: Port to contextlib.AbstractContextManager once
+    #   Python >=3.6 required
+
+    def __init__(self,
+                 uri='unix:/run/podman/io.projectatomic.podman',
+                 interface='io.projectatomic.podman'):
+        """Construct a podman varlink Client.
+
+        uri from default systemd unit file.
+        interface from io.projectatomic.podman.varlink, do not change unless
+            you are a varlink guru.
+        """
+        self._podman = None
+
+        @contextlib.contextmanager
+        def _podman(uri, interface):
+            """Context manager for API children to access varlink."""
+            client = VarlinkClient(address=uri)
+            try:
+                iface = client.open(interface)
+                yield iface
+            except VarlinkError as e:
+                raise error_factory(e) from e
+            finally:
+                if hasattr(client, 'close'):
+                    client.close()
+                iface.close()
+
+        self._client = functools.partial(_podman, uri, interface)
+
+        # Quick validation of connection data provided
+        if not System(self._client).ping():
+            raise ValueError('Failed varlink connection "{}/{}"'.format(
+                uri, interface))
+
+    def __enter__(self):
+        """Return `self` upon entering the runtime context."""
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        """Raise any exception triggered within the runtime context."""
+        return None
+
+    @cached_property
+    def system(self):
+        """Manage system model for podman."""
+        return System(self._client)
+
+    @cached_property
+    def images(self):
+        """Manage images model for libpod."""
+        return Images(self._client)
+
+    @cached_property
+    def containers(self):
+        """Manage containers model for libpod."""
+        return Containers(self._client)