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[Libguestfs] [PATCH v3 3/4] New event API - OCaml bindings (RHBZ#664558).



-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.
http://et.redhat.com/~rjones/virt-p2v
>From 0b5dc4c32d484a8731dd1829fd1a1fc5759621c1 Mon Sep 17 00:00:00 2001
From: Richard W.M. Jones <rjones redhat com>
Date: Mon, 14 Mar 2011 16:44:17 +0000
Subject: [PATCH 3/4] New event API - OCaml bindings (RHBZ#664558).

The functions set_progress_callback and clear_progress_callback have
been removed, and replaced with a complete mechanism for setting and
deleting general-purpose events.
---
 .gitignore                      |    1 +
 generator/.depend               |    6 +-
 generator/generator_ocaml.ml    |   84 ++++++++++++-----
 ocaml/Makefile.am               |    6 +
 ocaml/guestfs_c.c               |  195 +++++++++++++++++++++++++++++++--------
 ocaml/guestfs_c.h               |    2 +-
 ocaml/t/guestfs_400_events.ml   |   71 ++++++++++++++
 ocaml/t/guestfs_400_progress.ml |   10 +-
 8 files changed, 305 insertions(+), 70 deletions(-)
 create mode 100644 ocaml/t/guestfs_400_events.ml

diff --git a/.gitignore b/.gitignore
index d3b3f3e..c76451c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -211,6 +211,7 @@ ocaml/t/guestfs_005_load
 ocaml/t/guestfs_010_basic
 ocaml/t/guestfs_070_threads
 ocaml/t/guestfs_080_optargs
+ocaml/t/guestfs_400_events
 ocaml/t/guestfs_400_progress
 perl/bindtests.pl
 perl/blib
diff --git a/generator/.depend b/generator/.depend
index afd1c1e..77daa8c 100644
--- a/generator/.depend
+++ b/generator/.depend
@@ -70,10 +70,12 @@ generator_fish.cmx: generator_utils.cmx generator_types.cmx \
     generator_actions.cmx
 generator_ocaml.cmo: generator_utils.cmi generator_types.cmo \
     generator_structs.cmi generator_pr.cmi generator_optgroups.cmo \
-    generator_docstrings.cmo generator_c.cmo generator_actions.cmi
+    generator_events.cmo generator_docstrings.cmo generator_c.cmo \
+    generator_actions.cmi
 generator_ocaml.cmx: generator_utils.cmx generator_types.cmx \
     generator_structs.cmx generator_pr.cmx generator_optgroups.cmx \
-    generator_docstrings.cmx generator_c.cmx generator_actions.cmx
+    generator_events.cmx generator_docstrings.cmx generator_c.cmx \
+    generator_actions.cmx
 generator_perl.cmo: generator_utils.cmi generator_types.cmo \
     generator_structs.cmi generator_pr.cmi generator_optgroups.cmo \
     generator_docstrings.cmo generator_c.cmo generator_actions.cmi
diff --git a/generator/generator_ocaml.ml b/generator/generator_ocaml.ml
index ced6fb4..aa1adec 100644
--- a/generator/generator_ocaml.ml
+++ b/generator/generator_ocaml.ml
@@ -1,5 +1,5 @@
 (* libguestfs
- * Copyright (C) 2009-2010 Red Hat Inc.
+ * Copyright (C) 2009-2011 Red Hat Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -28,6 +28,7 @@ open Generator_optgroups
 open Generator_actions
 open Generator_structs
 open Generator_c
+open Generator_events
 
 (* Generate the OCaml bindings interface. *)
 let rec generate_ocaml_mli () =
@@ -60,27 +61,38 @@ val close : t -> unit
     unreferenced, but callers can call this in order to provide
     predictable cleanup. *)
 
-type progress_cb = int -> int -> int64 -> int64 -> unit
+type event =
+";
+  List.iter (
+    fun (name, _) ->
+      pr "  | EVENT_%s\n" (String.uppercase name)
+  ) events;
+  pr "\n";
+
+  pr "\
+val event_all : event list
+(** A list containing all event types. *)
 
-val set_progress_callback : t -> progress_cb -> unit
-(** [set_progress_callback g f] sets [f] as the progress callback function.
-    For some long-running functions, [f] will be called repeatedly
-    during the function with progress updates.
+type event_handle
+(** The opaque event handle which can be used to delete event callbacks. *)
 
-    The callback is [f proc_nr serial position total].  See
-    the description of [guestfs_set_progress_callback] in guestfs(3)
-    for the meaning of these four numbers.
+type event_callback =
+  t -> event -> event_handle -> string -> int64 array -> unit
+(** The event callback. *)
+
+val set_event_callback : t -> event_callback -> event list -> event_handle
+(** [set_event_callback g f es] sets [f] as the event callback function
+    for all events in the set [es].
 
     Note that if the closure captures a reference to the handle,
     this reference will prevent the handle from being
-    automatically closed by the garbage collector.  There are
-    three ways to avoid this: be careful not to capture the handle
-    in the closure, or use a weak reference, or call
-    {!Guestfs.clear_progress_callback} to remove the reference. *)
+    automatically closed by the garbage collector.  Since the
+    handle is passed to the event callback, with careful programming
+    it should be possible to avoid capturing the handle in the closure. *)
 
-val clear_progress_callback : t -> unit
-(** [clear_progress_callback g] removes any progress callback function
-    associated with the handle.  See {!Guestfs.set_progress_callback}. *)
+val delete_event_callback : t -> event_handle -> unit
+(** [delete_event_callback g eh] removes a previously registered
+    event callback.  See {!set_event_callback}. *)
 
 ";
   generate_ocaml_structure_decls ();
@@ -115,8 +127,8 @@ val clear_progress_callback : t -> unit
 
 class guestfs : unit -> object
   method close : unit -> unit
-  method set_progress_callback : progress_cb -> unit
-  method clear_progress_callback : unit -> unit
+  method set_event_callback : event_callback -> event list -> event_handle
+  method delete_event_callback : event_handle -> unit
   method ocaml_handle : t
 ";
 
@@ -147,12 +159,34 @@ exception Handle_closed of string
 external create : unit -> t = \"ocaml_guestfs_create\"
 external close : t -> unit = \"ocaml_guestfs_close\"
 
-type progress_cb = int -> int -> int64 -> int64 -> unit
+type event =
+";
+  List.iter (
+    fun (name, _) ->
+      pr "  | EVENT_%s\n" (String.uppercase name)
+  ) events;
+  pr "\n";
+
+  pr "\
+let event_all = [
+";
+  List.iter (
+    fun (name, _) ->
+      pr "  EVENT_%s;\n" (String.uppercase name)
+  ) events;
+
+  pr "\
+]
+
+type event_handle = int
+
+type event_callback =
+  t -> event -> event_handle -> string -> int64 array -> unit
 
-external set_progress_callback : t -> progress_cb -> unit
-  = \"ocaml_guestfs_set_progress_callback\"
-external clear_progress_callback : t -> unit
-  = \"ocaml_guestfs_clear_progress_callback\"
+external set_event_callback : t -> event_callback -> event list -> event_handle
+  = \"ocaml_guestfs_set_event_callback\"
+external delete_event_callback : t -> event_handle -> unit
+  = \"ocaml_guestfs_delete_event_callback\"
 
 (* Give the exceptions names, so they can be raised from the C code. *)
 let () =
@@ -175,8 +209,8 @@ class guestfs () =
   let g = create () in
   object
     method close () = close g
-    method set_progress_callback = set_progress_callback g
-    method clear_progress_callback () = clear_progress_callback g
+    method set_event_callback = set_event_callback g
+    method delete_event_callback = delete_event_callback g
     method ocaml_handle = g
 ";
 
diff --git a/ocaml/Makefile.am b/ocaml/Makefile.am
index 7008166..c07b9c5 100644
--- a/ocaml/Makefile.am
+++ b/ocaml/Makefile.am
@@ -66,12 +66,14 @@ TESTS = run-bindtests \
 	t/guestfs_010_basic \
 	t/guestfs_070_threads \
 	t/guestfs_080_optargs \
+	t/guestfs_400_events \
 	t/guestfs_400_progress
 noinst_DATA += bindtests \
 	t/guestfs_005_load \
 	t/guestfs_010_basic \
 	t/guestfs_070_threads \
 	t/guestfs_080_optargs \
+	t/guestfs_400_events \
 	t/guestfs_400_progress
 
 bindtests: bindtests.cmx mlguestfs.cmxa
@@ -94,6 +96,10 @@ t/guestfs_080_optargs: t/guestfs_080_optargs.cmx mlguestfs.cmxa
 	mkdir -p t
 	$(OCAMLFIND) ocamlopt -cclib -L$(top_builddir)/src/.libs -I . -package unix -linkpkg mlguestfs.cmxa $< -o $@
 
+t/guestfs_400_events: t/guestfs_400_events.cmx mlguestfs.cmxa
+	mkdir -p t
+	$(OCAMLFIND) ocamlopt -cclib -L$(top_builddir)/src/.libs -I . -package unix -linkpkg mlguestfs.cmxa $< -o $@
+
 t/guestfs_400_progress: t/guestfs_400_progress.cmx mlguestfs.cmxa
 	mkdir -p t
 	$(OCAMLFIND) ocamlopt -cclib -L$(top_builddir)/src/.libs -I . -package unix -linkpkg mlguestfs.cmxa $< -o $@
diff --git a/ocaml/guestfs_c.c b/ocaml/guestfs_c.c
index 1324fb6..a1386ec 100644
--- a/ocaml/guestfs_c.c
+++ b/ocaml/guestfs_c.c
@@ -1,5 +1,5 @@
 /* libguestfs
- * Copyright (C) 2009-2010 Red Hat Inc.
+ * Copyright (C) 2009-2011 Red Hat Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -35,8 +35,8 @@
 
 #include "guestfs_c.h"
 
-static void clear_progress_callback (guestfs_h *g);
-static void progress_callback (guestfs_h *g, void *data, int proc_nr, int serial, uint64_t position, uint64_t total);
+static value **get_all_event_callbacks (guestfs_h *g, size_t *len_rtn);
+static void event_callback_wrapper (guestfs_h *g, void *data, uint64_t event, int event_handle, int flags, const char *buf, size_t buf_len, const uint64_t *array, size_t array_len);
 
 /* This macro was added in OCaml 3.10.  Backport for earlier versions. */
 #ifndef CAMLreturnT
@@ -50,17 +50,39 @@ static void progress_callback (guestfs_h *g, void *data, int proc_nr, int serial
 /* These prototypes are solely to quiet gcc warning.  */
 CAMLprim value ocaml_guestfs_create (void);
 CAMLprim value ocaml_guestfs_close (value gv);
-CAMLprim value ocaml_guestfs_set_progress_callback (value gv, value closure);
-CAMLprim value ocaml_guestfs_clear_progress_callback (value gv);
+CAMLprim value ocaml_guestfs_set_event_callback (value gv, value closure, value events);
+CAMLprim value ocaml_guestfs_delete_event_callback (value gv, value eh);
 
 /* Allocate handles and deal with finalization. */
 static void
 guestfs_finalize (value gv)
 {
   guestfs_h *g = Guestfs_val (gv);
+
   if (g) {
-    clear_progress_callback (g);
+    /* There is a nasty, difficult to solve case here where the
+     * user deletes events in one of the callbacks that we are
+     * about to invoke, resulting in a double-free.  XXX
+     */
+    size_t len, i;
+    value **roots = get_all_event_callbacks (g, &len);
+
+    value *v = guestfs_get_private (g, "_ocaml_g");
+
+    /* Close the handle: this could invoke callbacks from the list
+     * above, which is why we don't want to delete them before
+     * closing the handle.
+     */
     guestfs_close (g);
+
+    /* Now unregister the global roots. */
+    for (i = 0; i < len; ++i) {
+      caml_remove_global_root (roots[i]);
+      free (roots[i]);
+    }
+
+    caml_remove_global_root (v);
+    free (v);
   }
 }
 
@@ -121,6 +143,7 @@ ocaml_guestfs_create (void)
   CAMLparam0 ();
   CAMLlocal1 (gv);
   guestfs_h *g;
+  value *v;
 
   g = guestfs_create ();
   if (g == NULL)
@@ -129,6 +152,18 @@ ocaml_guestfs_create (void)
   guestfs_set_error_handler (g, NULL, NULL);
 
   gv = Val_guestfs (g);
+
+  /* Store the OCaml handle into the C handle.  This is only so we can
+   * map the C handle to the OCaml handle in event_callback_wrapper.
+   */
+  v = guestfs_safe_malloc (g, sizeof *v);
+  *v = gv;
+  /* XXX This global root is generational, but we cannot rely on every
+   * user having the OCaml 3.11 version which supports this.
+   */
+  caml_register_global_root (v);
+  guestfs_set_private (g, "_ocaml_g", v);
+
   CAMLreturn (gv);
 }
 
@@ -173,80 +208,166 @@ ocaml_guestfs_free_strings (char **argv)
   free (argv);
 }
 
-#define PROGRESS_ROOT_KEY "_ocaml_progress_root"
+static uint64_t
+event_bitmask_of_event_list (value events)
+{
+  uint64_t r = 0;
+
+  while (events != Val_int (0)) {
+    r |= UINT64_C(1) << Int_val (Field (events, 0));
+    events = Field (events, 1);
+  }
+
+  return r;
+}
 
-/* Guestfs.set_progress_callback */
+/* Guestfs.set_event_callback */
 CAMLprim value
-ocaml_guestfs_set_progress_callback (value gv, value closure)
+ocaml_guestfs_set_event_callback (value gv, value closure, value events)
 {
-  CAMLparam2 (gv, closure);
+  CAMLparam3 (gv, closure, events);
+  char key[64];
+  int eh;
+  uint64_t event_bitmask;
 
   guestfs_h *g = Guestfs_val (gv);
-  clear_progress_callback (g);
+
+  event_bitmask = event_bitmask_of_event_list (events);
 
   value *root = guestfs_safe_malloc (g, sizeof *root);
   *root = closure;
 
+  eh = guestfs_set_event_callback (g, event_callback_wrapper,
+                                   event_bitmask, 0, root);
+
+  if (eh == -1) {
+    free (root);
+    ocaml_guestfs_raise_error (g, "set_event_callback");
+  }
+
   /* XXX This global root is generational, but we cannot rely on every
    * user having the OCaml 3.11 version which supports this.
    */
   caml_register_global_root (root);
 
-  guestfs_set_private (g, PROGRESS_ROOT_KEY, root);
-
-  guestfs_set_progress_callback (g, progress_callback, root);
+  snprintf (key, sizeof key, "_ocaml_event_%d", eh);
+  guestfs_set_private (g, key, root);
 
-  CAMLreturn (Val_unit);
+  CAMLreturn (Val_int (eh));
 }
 
-/* Guestfs.clear_progress_callback */
+/* Guestfs.delete_event_callback */
 CAMLprim value
-ocaml_guestfs_clear_progress_callback (value gv)
+ocaml_guestfs_delete_event_callback (value gv, value ehv)
 {
-  CAMLparam1 (gv);
+  CAMLparam2 (gv, ehv);
+  char key[64];
+  int eh = Int_val (ehv);
 
   guestfs_h *g = Guestfs_val (gv);
-  clear_progress_callback (g);
+
+  snprintf (key, sizeof key, "_ocaml_event_%d", eh);
+
+  value *root = guestfs_get_private (g, key);
+  if (root) {
+    caml_remove_global_root (root);
+    free (root);
+    guestfs_set_private (g, key, NULL);
+    guestfs_delete_event_callback (g, eh);
+  }
 
   CAMLreturn (Val_unit);
 }
 
-static void
-clear_progress_callback (guestfs_h *g)
+static value **
+get_all_event_callbacks (guestfs_h *g, size_t *len_rtn)
 {
-  guestfs_set_progress_callback (g, NULL, NULL);
+  value **r;
+  size_t i;
+  const char *key;
+  value *root;
+
+  /* Count the length of the array that will be needed. */
+  *len_rtn = 0;
+  root = guestfs_first_private (g, &key);
+  while (root != NULL) {
+    if (strncmp (key, "_ocaml_event_", strlen ("_ocaml_event_")) == 0)
+      (*len_rtn)++;
+    root = guestfs_next_private (g, &key);
+  }
 
-  value *root = guestfs_get_private (g, PROGRESS_ROOT_KEY);
-  if (root) {
-    caml_remove_global_root (root);
-    free (root);
-    guestfs_set_private (g, PROGRESS_ROOT_KEY, NULL);
+  /* Copy them into the return array. */
+  r = guestfs_safe_malloc (g, sizeof (value *) * (*len_rtn));
+
+  i = 0;
+  root = guestfs_first_private (g, &key);
+  while (root != NULL) {
+    if (strncmp (key, "_ocaml_event_", strlen ("_ocaml_event_")) == 0) {
+      r[i] = root;
+      i++;
+    }
+    root = guestfs_next_private (g, &key);
   }
+
+  return r;
+}
+
+/* Could do better: http://graphics.stanford.edu/~seander/bithacks.html */
+static int
+event_bitmask_to_event (uint64_t event)
+{
+  int r = 0;
+
+  while (event >>= 1)
+    r++;
+
+  return r;
 }
 
 static void
-progress_callback (guestfs_h *g ATTRIBUTE_UNUSED, void *root,
-                   int proc_nr, int serial, uint64_t position, uint64_t total)
+event_callback_wrapper (guestfs_h *g,
+                        void *data,
+                        uint64_t event,
+                        int event_handle,
+                        int flags,
+                        const char *buf, size_t buf_len,
+                        const uint64_t *array, size_t array_len)
 {
   CAMLparam0 ();
-  CAMLlocal5 (proc_nrv, serialv, positionv, totalv, rv);
+  CAMLlocal5 (gv, evv, ehv, bufv, arrayv);
+  CAMLlocal2 (rv, v);
+  value *root;
+  size_t i;
 
-  proc_nrv = Val_int (proc_nr);
-  serialv = Val_int (serial);
-  positionv = caml_copy_int64 (position);
-  totalv = caml_copy_int64 (total);
+  root = guestfs_get_private (g, "_ocaml_g");
+  gv = *root;
+
+  /* Only one bit should be set in 'event'.  Which one? */
+  evv = Val_int (event_bitmask_to_event (event));
+
+  ehv = Val_int (event_handle);
+
+  bufv = caml_alloc_string (buf_len);
+  memcpy (String_val (bufv), buf, buf_len);
+
+  arrayv = caml_alloc (array_len, 0);
+  for (i = 0; i < array_len; ++i) {
+    v = caml_copy_int64 (array[i]);
+    Store_field (arrayv, i, v);
+  }
 
-  value args[4] = { proc_nrv, serialv, positionv, totalv };
+  value args[5] = { gv, evv, ehv, bufv, arrayv };
 
   caml_leave_blocking_section ();
-  rv = caml_callbackN_exn (*(value*)root, 4, args);
+  rv = caml_callbackN_exn (*(value*)data, 5, args);
   caml_enter_blocking_section ();
 
   /* Callbacks shouldn't throw exceptions.  There's not much we can do
    * except to print it.
    */
   if (Is_exception_result (rv))
-    fprintf (stderr, "libguestfs: uncaught OCaml exception in progress callback: %s",
+    fprintf (stderr,
+             "libguestfs: uncaught OCaml exception in event callback: %s",
              caml_format_exception (Extract_exception (rv)));
 
   CAMLreturn0;
diff --git a/ocaml/guestfs_c.h b/ocaml/guestfs_c.h
index 219dc2f..a374bf2 100644
--- a/ocaml/guestfs_c.h
+++ b/ocaml/guestfs_c.h
@@ -1,5 +1,5 @@
 /* libguestfs
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009-2011 Red Hat Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/ocaml/t/guestfs_400_events.ml b/ocaml/t/guestfs_400_events.ml
new file mode 100644
index 0000000..7bd7715
--- /dev/null
+++ b/ocaml/t/guestfs_400_events.ml
@@ -0,0 +1,71 @@
+(* libguestfs OCaml bindings
+ * Copyright (C) 2011 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *)
+
+open Printf
+
+let log g ev eh buf array =
+  let ev =
+    match ev with
+    | Guestfs.EVENT_CLOSE -> "close"
+    | Guestfs.EVENT_SUBPROCESS_QUIT -> "subprocess_quit"
+    | Guestfs.EVENT_LAUNCH_DONE -> "launch_done"
+    | Guestfs.EVENT_PROGRESS -> "progress"
+    | Guestfs.EVENT_APPLIANCE -> "appliance"
+    | Guestfs.EVENT_LIBRARY -> "library"
+    | Guestfs.EVENT_TRACE -> "trace" in
+
+  let eh : int = Obj.magic eh in
+
+  printf "ocaml event logged: event=%s eh=%d buf=%S array=[%s]\n"
+    ev eh buf
+    (String.concat ", " (List.map Int64.to_string (Array.to_list array)))
+
+let close_invoked = ref 0
+
+let close g ev eh buf array =
+  incr close_invoked;
+  log g ev eh buf array
+
+let () =
+  let g = new Guestfs.guestfs () in
+
+  (* Grab log, trace and daemon messages into our own custom handler
+   * which prints the messages with a particular prefix.
+   *)
+  let events = [Guestfs.EVENT_APPLIANCE; Guestfs.EVENT_LIBRARY;
+                Guestfs.EVENT_TRACE] in
+  ignore (g#set_event_callback log events);
+
+  (* Check that the close event is invoked. *)
+  ignore (g#set_event_callback close [Guestfs.EVENT_CLOSE]);
+
+  (* Now make sure we see some messages. *)
+  g#set_trace true;
+  g#set_verbose true;
+
+  (* Do some stuff. *)
+  g#add_drive_ro "/dev/null";
+  g#set_autosync true;
+
+  (* Close the handle -- should call the close callback. *)
+  assert (!close_invoked = 0);
+  g#close ();
+  assert (!close_invoked = 1);
+
+  (* Run full garbage collection. *)
+  Gc.compact ()
diff --git a/ocaml/t/guestfs_400_progress.ml b/ocaml/t/guestfs_400_progress.ml
index 7227fac..f5b4219 100644
--- a/ocaml/t/guestfs_400_progress.ml
+++ b/ocaml/t/guestfs_400_progress.ml
@@ -1,5 +1,5 @@
 (* libguestfs OCaml bindings
- * Copyright (C) 2010 Red Hat Inc.
+ * Copyright (C) 2010-2011 Red Hat Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -25,15 +25,15 @@ let () =
   G.launch g;
 
   let calls = ref 0 in
-  let cb _ _ _ _ = incr calls in
-  G.set_progress_callback g cb;
+  let cb _ _ _ _ _ = incr calls in
+  let eh = G.set_event_callback g cb [G.EVENT_PROGRESS] in
   assert ("ok" = G.debug g "progress" [| "5" |]);
   assert (!calls > 0);
   calls := 0;
-  G.clear_progress_callback g;
+  G.delete_event_callback g eh;
   assert ("ok" = G.debug g "progress" [| "5" |]);
   assert (!calls = 0);
-  G.set_progress_callback g cb;
+  ignore (G.set_event_callback g cb [G.EVENT_PROGRESS]);
   assert ("ok" = G.debug g "progress" [| "5" |]);
   assert (!calls > 0);
 
-- 
1.7.4


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