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From 3169af3337938e18bf9ecc6ce936d644e14ff3de Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Tue, 28 Mar 2017 13:52:51 +0100
Subject: [PATCH 5/5] Change binding of virConnectGetAllDomainStats to return
dom UUID.
The virDomainPtr object returned by this binding isn't a reliable
virDomainPtr object. The only thing we can safely do with it is to
get its UUID. Modify the API correspondingly.
Updates commit 380f1e05b244ae4750ca5101b5b5a182dcd0d1fd.
---
examples/get_all_domain_stats.ml | 7 ++++---
libvirt/libvirt.ml | 6 +++---
libvirt/libvirt.mli | 6 +++---
libvirt/libvirt_c_oneoffs.c | 13 +++++++++++--
4 files changed, 21 insertions(+), 11 deletions(-)
diff --git a/examples/get_all_domain_stats.ml b/examples/get_all_domain_stats.ml
index cc86da6..be91f77 100644
--- a/examples/get_all_domain_stats.ml
+++ b/examples/get_all_domain_stats.ml
@@ -8,10 +8,11 @@ open Printf
module C = Libvirt.Connect
module D = Libvirt.Domain
-let print_stats stats =
+let print_stats conn stats =
try
Array.iter (
- fun { D.dom = dom; D.params = params } ->
+ fun { D.dom_uuid = uuid; D.params = params } ->
+ let dom = D.lookup_by_uuid conn uuid in
printf "domain %s:\n" (D.get_name dom);
Array.iteri (
fun i (field, value) ->
@@ -55,7 +56,7 @@ let () =
while not !quit do
let stats = D.get_all_domain_stats conn what who in
- if stats <> [||] then print_stats stats
+ if stats <> [||] then print_stats conn stats
else (
printf "no guests found\n";
quit := true
diff --git a/libvirt/libvirt.ml b/libvirt/libvirt.ml
index ce1878a..d03a127 100644
--- a/libvirt/libvirt.ml
+++ b/libvirt/libvirt.ml
@@ -408,8 +408,8 @@ struct
| StatsState | StatsCpuTotal | StatsBalloon | StatsVcpu
| StatsInterface | StatsBlock | StatsPerf
- type 'a domain_stats_record = {
- dom : 'a t;
+ type domain_stats_record = {
+ dom_uuid : uuid;
params : typed_param array;
}
@@ -467,7 +467,7 @@ struct
external block_peek : [>`W] t -> string -> int64 -> int -> string -> int -> unit = "ocaml_libvirt_domain_block_peek_bytecode" "ocaml_libvirt_domain_block_peek_native"
external memory_peek : [>`W] t -> memory_flag list -> int64 -> int -> string -> int -> unit = "ocaml_libvirt_domain_memory_peek_bytecode" "ocaml_libvirt_domain_memory_peek_native"
- external get_all_domain_stats : 'a Connect.t -> stats_type list -> get_all_domain_stats_flag list -> 'a domain_stats_record array = "ocaml_libvirt_domain_get_all_domain_stats"
+ external get_all_domain_stats : [>`R] Connect.t -> stats_type list -> get_all_domain_stats_flag list -> domain_stats_record array = "ocaml_libvirt_domain_get_all_domain_stats"
external const : [>`R] t -> ro t = "%identity"
diff --git a/libvirt/libvirt.mli b/libvirt/libvirt.mli
index d1b5992..dc0033b 100644
--- a/libvirt/libvirt.mli
+++ b/libvirt/libvirt.mli
@@ -494,8 +494,8 @@ sig
| StatsState | StatsCpuTotal | StatsBalloon | StatsVcpu
| StatsInterface | StatsBlock | StatsPerf
- type 'a domain_stats_record = {
- dom : 'a t;
+ type domain_stats_record = {
+ dom_uuid : uuid;
params : typed_param array;
}
@@ -636,7 +636,7 @@ sig
See also {!max_peek}. *)
- external get_all_domain_stats : 'a Connect.t -> stats_type list -> get_all_domain_stats_flag list -> 'a domain_stats_record array = "ocaml_libvirt_domain_get_all_domain_stats"
+ external get_all_domain_stats : [>`R] Connect.t -> stats_type list -> get_all_domain_stats_flag list -> domain_stats_record array = "ocaml_libvirt_domain_get_all_domain_stats"
(** [get_all_domain_stats conn stats flags] allows you to read
all stats across multiple/all domains in a single call.
diff --git a/libvirt/libvirt_c_oneoffs.c b/libvirt/libvirt_c_oneoffs.c
index 17412f5..958ba69 100644
--- a/libvirt/libvirt_c_oneoffs.c
+++ b/libvirt/libvirt_c_oneoffs.c
@@ -570,6 +570,7 @@ ocaml_libvirt_domain_get_all_domain_stats (value connv,
virDomainStatsRecordPtr *rstats;
unsigned int stats = 0, flags = 0;
int i, j, r;
+ unsigned char uuid[VIR_UUID_BUFLEN];
/* Get stats and flags. */
for (; statsv != Val_int (0); statsv = Field (statsv, 1)) {
@@ -619,8 +620,16 @@ ocaml_libvirt_domain_get_all_domain_stats (value connv,
rv = caml_alloc (r, 0); /* domain_stats_record array. */
for (i = 0; i < r; ++i) {
dsv = caml_alloc (2, 0); /* domain_stats_record */
- virDomainRef (rstats[i]->dom);
- Store_field (dsv, 0, Val_domain (rstats[i]->dom, connv));
+
+ /* Libvirt returns something superficially resembling a
+ * virDomainPtr, but it's not a real virDomainPtr object
+ * (eg. dom->id == -1, and its refcount is wrong). The only thing
+ * we can safely get from it is the UUID.
+ */
+ v = caml_alloc_string (VIR_UUID_BUFLEN);
+ virDomainGetUUID (rstats[i]->dom, uuid);
+ memcpy (String_val (v), uuid, VIR_UUID_BUFLEN);
+ Store_field (dsv, 0, v);
tpv = caml_alloc (rstats[i]->nparams, 0); /* typed_param array */
for (j = 0; j < rstats[i]->nparams; ++j) {
--
2.9.3
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