error.c

   1 /*
   2  * QEMU Error Objects
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU LGPL, version 2.  See
  10  * the COPYING.LIB file in the top-level directory.
  11  */
  12
  13 #include "qemu-common.h"
  14 #include "error.h"
  15 #include "error_int.h"
  16 #include "qemu-objects.h"
  17 #include "qerror.h"
  18
  19 struct Error
  20 {
  21     QDict *obj;
  22     const char *fmt;
  23     char *msg;
  24 };
  25
  26 void error_set(Error **errp, const char *fmt, ...)
  27 {
  28     Error *err;
  29     va_list ap;
  30
  31     if (errp == NULL) {
  32         return;
  33     }
  34
  35     err = qemu_mallocz(sizeof(*err));
  36
  37     va_start(ap, fmt);
  38     err->obj = qobject_to_qdict(qobject_from_jsonv(fmt, &ap));
  39     va_end(ap);
  40     err->fmt = fmt;
  41
  42     *errp = err;
  43 }
  44
  45 bool error_is_set(Error **errp)
  46 {
  47     return (errp && *errp);
  48 }
  49
  50 const char *error_get_pretty(Error *err)
  51 {
  52     if (err->msg == NULL) {
  53         QString *str;
  54         str = qerror_format(err->fmt, err->obj);
  55         err->msg = qemu_strdup(qstring_get_str(str));
  56         QDECREF(str);
  57     }
  58
  59     return err->msg;
  60 }
  61
  62 const char *error_get_field(Error *err, const char *field)
  63 {
  64     if (strcmp(field, "class") == 0) {
  65         return qdict_get_str(err->obj, field);
  66     } else {
  67         QDict *dict = qdict_get_qdict(err->obj, "data");
  68         return qdict_get_str(dict, field);
  69     }
  70 }
  71
  72 QDict *error_get_data(Error *err)
  73 {
  74     QDict *data = qdict_get_qdict(err->obj, "data");
  75     QINCREF(data);
  76     return data;
  77 }
  78
  79 void error_set_field(Error *err, const char *field, const char *value)
  80 {
  81     QDict *dict = qdict_get_qdict(err->obj, "data");
  82     return qdict_put(dict, field, qstring_from_str(value));
  83 }
  84
  85 void error_free(Error *err)
  86 {
  87     if (err) {
  88         QDECREF(err->obj);
  89         qemu_free(err->msg);
  90         qemu_free(err);
  91     }
  92 }
  93
  94 bool error_is_type(Error *err, const char *fmt)
  95 {
  96     const char *error_class;
  97     char *ptr;
  98     char *end;
  99
 100     ptr = strstr(fmt, "'class': '");
 101     assert(ptr != NULL);
 102     ptr += strlen("'class': '");
 103
 104     end = strchr(ptr, '\'');
 105     assert(end != NULL);
 106
 107     error_class = error_get_field(err, "class");
 108     if (strlen(error_class) != end - ptr) {
 109         return false;
 110     }
 111
 112     return strncmp(ptr, error_class, end - ptr) == 0;
 113 }
 114
 115 void error_propagate(Error **dst_err, Error *local_err)
 116 {
 117     if (dst_err) {
 118         *dst_err = local_err;
 119     } else if (local_err) {
 120         error_free(local_err);
 121     }
 122 }
 123
 124 QObject *error_get_qobject(Error *err)
 125 {
 126     QINCREF(err->obj);
 127     return QOBJECT(err->obj);
 128 }
 129
 130 void error_set_qobject(Error **errp, QObject *obj)
 131 {
 132     Error *err;
 133     if (errp == NULL) {
 134         return;
 135     }
 136     err = qemu_mallocz(sizeof(*err));
 137     err->obj = qobject_to_qdict(obj);
 138     qobject_incref(obj);
 139
 140     *errp = err;
 141 }