ocaml-xapi-plugin

Library to simplify writing xapi plugins in OCaml

Build dependencies

• rpc

Usage

Simple xapi plugin which waits a specified number of seconds, then returns the string "done":

let main session_id args =
  if List.mem_assoc "sleep" args then begin
    let time = int_of_string (List.assoc "sleep" args) in
    Unix.sleep time
  end;
  "done"

let () =
  Xapi_plugin.dispatch [
    "main", main;
  ]

Compile with:

$ ocamlfind ocamlopt -package unix -package rpclib -package xapi-plugin -linkpkg test_ocaml_plugin.ml -o test-ocaml-plugin

Copy the resulting binary to /etc/xapi.d/plugins on an XCP/XenServer host, and then run like so:

# xe host-call-plugin host-uuid=0775b809-2064-4b1c-9b20-c02cab711ac8 plugin=test-ocaml-plugin fn=main args:sleep=5
done

It's also possible to run the same code as an interpreted script with these lines added to the top:

#!/path/to/ocaml

#use "topfind"
#require "xapi-plugin"