Re: [Xen-API] xapi-client

[Dave Scott <Dave.Scott@xxxxxxxxxx>]

> On 9 Jan 2015, at 15:51, buzz heavyyear <buzzheavyyear@xxxxxxxxxxx> wrote:
> 
> Ah, so you  haven't installed xapi/xenserver on cubieboard yet? ;)

/me suddenly realises his cubieboard is unplugged and swiftly turns it back on 
again ;)

I’d like to improve the OCaml bindings so I’m interested in any experiences you 
have (positive or negative). My top 2 usability annoyances are:

1. we use labelled arguments but not optional arguments, even when there is a 
defined default value.
2. we should allow the client to register some kind of nice transient 
connection failure handler/policy: at the moment every RPC invocation can fail 
and it can be annoying to handle. Sometimes you just wish to say: keep retrying 
and bail out after n seconds.


> 
> -n
> 
> Subject: Re: [Xen-API] xapi-client
> From: anil@xxxxxxxxxx
> Date: Fri, 9 Jan 2015 15:35:12 +0000
> CC: xen-api@xxxxxxxxxxxxx
> To: buzzheavyyear@xxxxxxxxxxx
> 
> It so happens that I just (yesterday) also installed XenServer on x86 and 
> would like to get the XenAPI client bindings from OCaml, and so am most 
> interested in this!
> 
> -a
> 
> On 9 Jan 2015, at 09:56, buzz heavyyear <buzzheavyyear@xxxxxxxxxxx> wrote:
> 
> Hello everyone,
> 
> Just to introduce myself as someone starting out with xapi on arm. Apologies 
> in advance for any future trivial questions to the list!
> 
> I've been trying to compile the lwt_test/list_vms.ml with the following 
> _oasis file:
> 
> OASISFormat: 0.4
> Name:        list_vms_lwt
> Version:     0.1
> Synopsis:    Xapi Client Example
> Authors:     njb
> License:     PROP
> BuildTools: ocamlbuild
> Plugins: META (0.4), DevFiles (0.4)
> 
> Executable "list_vms_lwt"
>   Path: .
>   MainIs: list_vms.ml
>   BuildDepends: xen-api-client, xen-api-client.lwt, lwt, lwt.ssl, lwt.unix
>   CompiledObject: best
> 
> 
> 
> With opam up to date with lwt etc., I get:
> 
> File "list_vms.ml", line 32, characters 76-78:
> Error: Syntax error
> Command exited with code 2.
> E: Failure("Command ''/usr/bin/ocamlbuild' list_vms.native -tag debug' 
> terminated with error code 10”)

This almost certainly means it needs the lwt.syntax and didn’t have it. Try 
adding “, lwt.syntax” to the BuildDepends and “oasis setup” “make”.

> 
> 
> When I modify _oasis to include the lwt Build flag:
> 
> OASISFormat: 0.4
> Name:        list_vms_lwt
> Version:     0.1
> Synopsis:    Xapi Client Example
> Authors:     njb
> License:     PROP
> BuildTools: ocamlbuild
> Plugins: META (0.4), DevFiles (0.4)
> 
> Flag lwt
>   Description: build the Lwt library
>   Default: false
> 
> Executable "list_vms_lwt"
>   Path: .
>   MainIs: list_vms.ml
>   Install$: flag(lwt)
>   Build$: flag(lwt)
>   BuildDepends: xen-api-client, xen-api-client.lwt, lwt, lwt.ssl, lwt.unix
>   CompiledObject: best
> 
> 
> 
> 
> when running make I get :
> 
> ocaml setup.ml -build 
> /usr/bin/ocamlopt.opt unix.cmxa -I /usr/lib/ocaml/ocamlbuild 
> /usr/lib/ocaml/ocamlbuild/ocamlbuildlib.cmxa myocamlbuild.ml 
> /usr/lib/ocaml/ocamlbuild/ocamlbuild.cmx -o myocamlbuild
> MAKE SUCCESSFUL (total time: 1s)
> 
> 
> .... but no executable.

Hmm, the lwt flag defaults to false and is set to true by the Makefile:

LWT ?= $(shell if ocamlfind query lwt.ssl >/dev/null 2>&1; then echo 
--enable-lwt; fi)

So it looks like you need to “opam install ssl”

Cheers,
Dave

> 
> Could somebody possibly point out my error?
> 
> Thanks
> Nick
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