albatross/app/vmmc_local.ml

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(* (c) 2017, 2018 Hannes Mehnert, all rights reserved *)
open Lwt.Infix
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let version = `AV2
let process fd =
Vmm_lwt.read_wire fd >|= function
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| Error _ ->
Error (`Msg "read or parse error")
| Ok (header, reply) ->
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if Vmm_commands.version_eq header.Vmm_commands.version version then begin
Logs.app (fun m -> m "%a" Vmm_commands.pp_wire (header, reply)) ;
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Ok ()
end else begin
Logs.err (fun m -> m "version not equal") ;
Error (`Msg "version not equal")
end
let socket t = function
| Some x -> x
| None -> Vmm_core.socket_path t
let connect socket_path =
let c = Lwt_unix.(socket PF_UNIX SOCK_STREAM 0) in
Lwt_unix.set_close_on_exec c ;
Lwt_unix.connect c (Lwt_unix.ADDR_UNIX socket_path) >|= fun () ->
c
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let read fd =
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(* now we busy read and process output *)
let rec loop () =
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process fd >>= function
| Error e -> Lwt.return (Error e)
| Ok () -> loop ()
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in
loop ()
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let handle opt_socket id (cmd : Vmm_commands.t) =
let sock, next = Vmm_commands.endpoint cmd in
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connect (socket sock opt_socket) >>= fun fd ->
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let header = Vmm_commands.{ version ; sequence = 0L ; id } in
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Vmm_lwt.write_wire fd (header, `Command cmd) >>= function
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| Error `Exception -> Lwt.return (Error (`Msg "couldn't write"))
| Ok () ->
(match next with
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| `Read -> read fd
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| `End -> process fd) >>= fun res ->
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Vmm_lwt.safe_close fd >|= fun () ->
res
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let jump opt_socket name cmd =
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match
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Lwt_main.run (handle opt_socket name cmd)
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with
| Ok () -> `Ok ()
| Error (`Msg m) -> `Error (false, m)
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let info_ _ opt_socket name = jump opt_socket name (`Vm_cmd `Vm_info)
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let info_policy _ opt_socket name =
jump opt_socket name (`Policy_cmd `Policy_info)
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let remove_policy _ opt_socket name =
jump opt_socket name (`Policy_cmd `Policy_remove)
let add_policy _ opt_socket name vms memory cpus block bridges =
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let p = Vmm_cli.policy vms memory cpus block bridges in
jump opt_socket name (`Policy_cmd (`Policy_add p))
let destroy _ opt_socket name =
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jump opt_socket name (`Vm_cmd `Vm_destroy)
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let create _ opt_socket force name image cpuid requested_memory boot_params block_device network compression =
match Vmm_cli.create_vm force image cpuid requested_memory boot_params block_device network compression with
| Ok cmd -> jump opt_socket name (`Vm_cmd cmd)
| Error (`Msg msg) -> `Error (false, msg)
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let console _ opt_socket name since =
jump opt_socket name (`Console_cmd (`Console_subscribe since))
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let stats _ opt_socket name =
jump opt_socket name (`Stats_cmd `Stats_subscribe)
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let event_log _ opt_socket name since =
jump opt_socket name (`Log_cmd (`Log_subscribe since))
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let help _ _ man_format cmds = function
| None -> `Help (`Pager, None)
| Some t when List.mem t cmds -> `Help (man_format, Some t)
| Some _ -> List.iter print_endline cmds; `Ok ()
open Cmdliner
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open Vmm_cli
let socket =
let doc = "Socket to connect to" in
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Arg.(value & opt (some string) None & info [ "socket" ] ~doc)
let destroy_cmd =
let doc = "destroys a virtual machine" in
let man =
[`S "DESCRIPTION";
`P "Destroy a virtual machine."]
in
Term.(ret (const destroy $ setup_log $ socket $ vm_name)),
Term.info "destroy" ~doc ~man
let remove_policy_cmd =
let doc = "removes a policy" in
let man =
[`S "DESCRIPTION";
`P "Removes a policy."]
in
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Term.(ret (const remove_policy $ setup_log $ socket $ opt_vm_name)),
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Term.info "remove_policy" ~doc ~man
let info_cmd =
let doc = "information about VMs" in
let man =
[`S "DESCRIPTION";
`P "Shows information about VMs."]
in
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Term.(ret (const info_ $ setup_log $ socket $ opt_vm_name)),
Term.info "info" ~doc ~man
let policy_cmd =
let doc = "active policies" in
let man =
[`S "DESCRIPTION";
`P "Shows information about policies."]
in
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Term.(ret (const info_policy $ setup_log $ socket $ opt_vm_name)),
Term.info "policy" ~doc ~man
let add_policy_cmd =
let doc = "Add a policy" in
let man =
[`S "DESCRIPTION";
`P "Adds a policy."]
in
Term.(ret (const add_policy $ setup_log $ socket $ vm_name $ vms $ mem $ cpus $ block_size $ bridge)),
Term.info "add_policy" ~doc ~man
let create_cmd =
let doc = "creates a virtual machine" in
let man =
[`S "DESCRIPTION";
`P "Creates a virtual machine."]
in
Term.(ret (const create $ setup_log $ socket $ force $ vm_name $ image $ cpu $ vm_mem $ args $ block $ net $ compress_level)),
Term.info "create" ~doc ~man
let console_cmd =
let doc = "console of a VM" in
let man =
[`S "DESCRIPTION";
`P "Shows console output of a VM."]
in
Term.(ret (const console $ setup_log $ socket $ vm_name $ since)),
Term.info "console" ~doc ~man
let stats_cmd =
let doc = "statistics of VMs" in
let man =
[`S "DESCRIPTION";
`P "Shows statistics of VMs."]
in
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Term.(ret (const stats $ setup_log $ socket $ opt_vm_name)),
Term.info "stats" ~doc ~man
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let log_cmd =
let doc = "Event log" in
let man =
[`S "DESCRIPTION";
`P "Shows event log of VM."]
in
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Term.(ret (const event_log $ setup_log $ socket $ opt_vm_name $ since)),
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Term.info "log" ~doc ~man
let help_cmd =
let topic =
let doc = "The topic to get help on. `topics' lists the topics." in
Arg.(value & pos 0 (some string) None & info [] ~docv:"TOPIC" ~doc)
in
let doc = "display help about vmmc" in
let man =
[`S "DESCRIPTION";
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`P "Prints help about albatross local client commands and subcommands"]
in
Term.(ret (const help $ setup_log $ socket $ Term.man_format $ Term.choice_names $ topic)),
Term.info "help" ~doc ~man
let default_cmd =
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let doc = "VMM local client" in
let man = [
`S "DESCRIPTION" ;
`P "$(tname) connects to vmmd via a local socket" ]
in
Term.(ret (const help $ setup_log $ socket $ Term.man_format $ Term.choice_names $ Term.pure None)),
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Term.info "vmmc_local" ~version:"%%VERSION_NUM%%" ~doc ~man
let cmds = [ help_cmd ; info_cmd ; policy_cmd ; remove_policy_cmd ; add_policy_cmd ; destroy_cmd ; create_cmd ; console_cmd ; stats_cmd ; log_cmd ]
let () =
match Term.eval_choice default_cmd cmds
with `Ok () -> exit 0 | _ -> exit 1