Add functionality for socket communication.

The Message module contains read and write functions that take care of
the wire protocol, which sends a 4 byte length header before every message.
They take a bytes buffer and don't care about its contents.

The Vyconf_client module has high level functions for interfacing with vyconfd.

Functions for creating a socket and creating a server loop are in Startup.

The rest is, for now at least, right in vyconfd.

Notes:
Message.read/write probably should be wrapped in Lwt_io.atomic
We need to find out if it's safe to reuse Pbrt.Encoder.t or we really
should create it every time.

1 files changed, 26 insertions, 0 deletions

diff --git a/src/vyconf_client.mli b/src/vyconf_client.mli
new file mode 100644
index 0000000..87fffdd
--- /dev/null
+++ b/src/vyconf_client.mli
@@ -0,0 +1,26 @@
+type t
+
+type status =
+  | Success 
+  | Fail 
+  | Invalid_path 
+  | Invalid_value 
+  | Commit_in_progress 
+  | Configuration_locked 
+  | Internal_error 
+  | Permission_denied 
+  | Path_already_exists 
+
+type response = {
+  status : status;
+  output : string option;
+  error : string option;
+  warning : string option;
+}
+
+
+val create : string -> t Lwt.t
+
+val shutdown : t -> t Lwt.t
+
+val get_status : t -> response Lwt.t