Added asynchronous event notification through the Xen-API. Added a new command,

xm event-monitor, a new test program for the C bindings, and new bindings
themselves.

Signed-off-by: Ewan Mellor <ewan@xensource.com>

1 files changed, 211 insertions, 0 deletions

diff --git a/tools/libxen/test/test_event_handling.c b/tools/libxen/test/test_event_handling.c
new file mode 100644
index 0000000000..52638949ae
--- /dev/null
+++ b/tools/libxen/test/test_event_handling.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2006-2007 XenSource, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ */
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <libxml/parser.h>
+#include <curl/curl.h>
+
+#include "xen_event.h"
+
+//#define PRINT_XML
+
+static void usage()
+{
+    fprintf(stderr,
+"Usage:\n"
+"\n"
+"    test_event_handling <server> <username> <password>\n"
+"\n"
+"where\n"
+"        <server>   is the server's host and port, e.g. localhost:9363;\n"
+"        <username> is the username to use at the server; and\n"
+"        <password> is the password.\n");
+
+    exit(EXIT_FAILURE);
+}
+
+
+static char *url;
+
+
+typedef struct
+{
+    xen_result_func func;
+    void *handle;
+} xen_comms;
+
+
+static size_t
+write_func(void *ptr, size_t size, size_t nmemb, xen_comms *comms)
+{
+    size_t n = size * nmemb;
+#ifdef PRINT_XML
+    printf("\n\n---Result from server -----------------------\n");
+    printf("%s\n",((char*) ptr));
+    fflush(stdout);
+#endif
+    return comms->func(ptr, n, comms->handle) ? n : 0;
+}
+
+
+static int
+call_func(const void *data, size_t len, void *user_handle,
+          void *result_handle, xen_result_func result_func)
+{
+    (void)user_handle;
+
+#ifdef PRINT_XML
+    printf("\n\n---Data to server: -----------------------\n");
+    printf("%s\n",((char*) data));
+    fflush(stdout);
+#endif
+
+    CURL *curl = curl_easy_init();
+    if (!curl) {
+        return -1;
+    }
+
+    xen_comms comms = {
+        .func = result_func,
+        .handle = result_handle
+    };
+
+    curl_easy_setopt(curl, CURLOPT_URL, url);
+    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1);
+    curl_easy_setopt(curl, CURLOPT_MUTE, 1);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &write_func);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &comms);
+    curl_easy_setopt(curl, CURLOPT_POST, 1);
+    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
+    curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, len);
+
+    CURLcode result = curl_easy_perform(curl);
+
+    curl_easy_cleanup(curl);
+
+    return result;
+}
+
+
+static void print_error(xen_session *session)
+{
+    fprintf(stderr, "Error: %d", session->error_description_count);
+    for (int i = 0; i < session->error_description_count; i++)
+    {
+        fprintf(stderr, "%s ", session->error_description[i]);
+    }
+    fprintf(stderr, "\n");
+}
+
+
+/**
+ * Workaround for whinging GCCs, as suggested by strftime(3).
+ */
+static size_t my_strftime(char *s, size_t max, const char *fmt,
+                          const struct tm *tm)
+{
+    return strftime(s, max, fmt, tm);
+}
+
+
+int main(int argc, char **argv)
+{
+    if (argc != 4)
+    {
+        usage();
+    }
+
+    url = argv[1];
+    char *username = argv[2];
+    char *password = argv[3];
+
+    xmlInitParser();
+    xen_init();
+    curl_global_init(CURL_GLOBAL_ALL);
+
+#define CLEANUP                                 \
+    do {                                        \
+        xen_session_logout(session);            \
+        curl_global_cleanup();                  \
+        xen_fini();                             \
+        xmlCleanupParser();                     \
+    } while(0)                                  \
+
+    
+    xen_session *session =
+        xen_session_login_with_password(call_func, NULL, username, password);
+
+    struct xen_string_set *classes = xen_string_set_alloc(0);
+    xen_event_register(session, classes);
+    xen_string_set_free(classes);
+
+    if (!session->ok)
+    {
+        print_error(session);
+        CLEANUP;
+        return 1;
+    }
+
+    while (true)
+    {
+        struct xen_event_record_set *events;
+        if (!xen_event_next(session, &events))
+        {
+            print_error(session);
+            CLEANUP;
+            return 1;
+        }
+
+        for (size_t i = 0; i < events->size; i++)
+        {
+            xen_event_record *ev = events->contents[i];
+            char time[256];
+            struct tm *tm = localtime(&ev->timestamp);
+            my_strftime(time, 256, "%c, local time", tm);
+            printf("Event received: ID = %"PRId64", %s.\n", ev->id, time);
+            switch (ev->operation)
+            {
+            case XEN_EVENT_OPERATIONS_ADD:
+                printf("%s created with UUID %s.\n", ev->class, ev->obj_uuid);
+                break;
+
+            case XEN_EVENT_OPERATIONS_DEL:
+                printf("%s with UUID %s deleted.\n", ev->class, ev->obj_uuid);
+                break;
+
+            case XEN_EVENT_OPERATIONS_MOD:
+                printf("%s with UUID %s modified.\n", ev->class, ev->obj_uuid);
+                break;
+            default:
+                assert(false);
+            }
+        }
+
+        xen_event_record_set_free(events);
+    }
+
+    CLEANUP;
+
+    return 0;
+}