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 "qjson.h"
  16 #include "qdict.h"
  17 #include "error_int.h"
  18 #include "qerror.h"
  19
  20 struct Error
  21 {
  22     QDict *obj;
  23     const char *fmt;
  24     char *msg;
  25 };
  26
  27 void error_set(Error **errp, const char *fmt, ...)
  28 {
  29     Error *err;
  30     va_list ap;
  31
  32     if (errp == NULL) {
  33         return;
  34     }
  35
  36     err = g_malloc0(sizeof(*err));
  37
  38     va_start(ap, fmt);
  39     err->obj = qobject_to_qdict(qobject_from_jsonv(fmt, &ap));
  40     va_end(ap);
  41     err->fmt = fmt;
  42
  43     *errp = err;
  44 }
  45
  46 Error *error_copy(const Error *err)
  47 {
  48     Error *err_new;
  49
  50     err_new = g_malloc0(sizeof(*err));
  51     err_new->msg = g_strdup(err->msg);
  52     err_new->fmt = err->fmt;
  53     err_new->obj = err->obj;
  54     QINCREF(err_new->obj);
  55
  56     return err_new;
  57 }
  58
  59 bool error_is_set(Error **errp)
  60 {
  61     return (errp && *errp);
  62 }
  63
  64 const char *error_get_pretty(Error *err)
  65 {
  66     if (err->msg == NULL) {
  67         QString *str;
  68         str = qerror_format(err->fmt, err->obj);
  69         err->msg = g_strdup(qstring_get_str(str));
  70         QDECREF(str);
  71     }
  72
  73     return err->msg;
  74 }
  75
  76 const char *error_get_field(Error *err, const char *field)
  77 {
  78     if (strcmp(field, "class") == 0) {
  79         return qdict_get_str(err->obj, field);
  80     } else {
  81         QDict *dict = qdict_get_qdict(err->obj, "data");
  82         return qdict_get_str(dict, field);
  83     }
  84 }
  85
  86 QDict *error_get_data(Error *err)
  87 {
  88     QDict *data = qdict_get_qdict(err->obj, "data");
  89     QINCREF(data);
  90     return data;
  91 }
  92
  93 void error_set_field(Error *err, const char *field, const char *value)
  94 {
  95     QDict *dict = qdict_get_qdict(err->obj, "data");
  96     qdict_put(dict, field, qstring_from_str(value));
  97 }
  98
  99 void error_free(Error *err)
 100 {
 101     if (err) {
 102         QDECREF(err->obj);
 103         g_free(err->msg);
 104         g_free(err);
 105     }
 106 }
 107
 108 bool error_is_type(Error *err, const char *fmt)
 109 {
 110     const char *error_class;
 111     char *ptr;
 112     char *end;
 113
 114     if (!err) {
 115         return false;
 116     }
 117
 118     ptr = strstr(fmt, "'class': '");
 119     assert(ptr != NULL);
 120     ptr += strlen("'class': '");
 121
 122     end = strchr(ptr, '\'');
 123     assert(end != NULL);
 124
 125     error_class = error_get_field(err, "class");
 126     if (strlen(error_class) != end - ptr) {
 127         return false;
 128     }
 129
 130     return strncmp(ptr, error_class, end - ptr) == 0;
 131 }
 132
 133 void error_propagate(Error **dst_err, Error *local_err)
 134 {
 135     if (dst_err) {
 136         *dst_err = local_err;
 137     } else if (local_err) {
 138         error_free(local_err);
 139     }
 140 }
 141
 142 QObject *error_get_qobject(Error *err)
 143 {
 144     QINCREF(err->obj);
 145     return QOBJECT(err->obj);
 146 }
 147
 148 void error_set_qobject(Error **errp, QObject *obj)
 149 {
 150     Error *err;
 151     if (errp == NULL) {
 152         return;
 153     }
 154     err = g_malloc0(sizeof(*err));
 155     err->obj = qobject_to_qdict(obj);
 156     qobject_incref(obj);
 157
 158     *errp = err;
 159 }