Initial implementation of OVSDB.

1 files changed, 221 insertions, 0 deletions

diff --git a/lib/ovsdb-error.c b/lib/ovsdb-error.c
new file mode 100644
index 000000000..c0eddf280
--- /dev/null
+++ b/lib/ovsdb-error.c
@@ -0,0 +1,221 @@
+/* Copyright (c) 2009 Nicira Networks
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include "ovsdb-error.h"
+
+#include <inttypes.h>
+
+#include "backtrace.h"
+#include "dynamic-string.h"
+#include "json.h"
+#include "util.h"
+
+struct ovsdb_error {
+    const char *tag;            /* String for "error" member. */
+    char *details;              /* String for "details" member. */
+    char *syntax;               /* String for "syntax" member. */
+    int errno_;                 /* Unix errno value, 0 if none. */
+};
+
+static struct ovsdb_error *
+ovsdb_error_valist(const char *tag, const char *details, va_list args)
+{
+    struct ovsdb_error *error = xmalloc(sizeof *error);
+    error->tag = tag ? tag : "ovsdb error";
+    error->details = details ? xvasprintf(details, args) : NULL;
+    error->syntax = NULL;
+    error->errno_ = 0;
+    return error;
+}
+
+struct ovsdb_error *
+ovsdb_error(const char *tag, const char *details, ...)
+{
+    struct ovsdb_error *error;
+    va_list args;
+
+    va_start(args, details);
+    error = ovsdb_error_valist(tag, details, args);
+    va_end(args);
+
+    return error;
+}
+
+struct ovsdb_error *
+ovsdb_io_error(int errno_, const char *details, ...)
+{
+    struct ovsdb_error *error;
+    va_list args;
+
+    va_start(args, details);
+    error = ovsdb_error_valist("I/O error", details, args);
+    va_end(args);
+
+    error->errno_ = errno_;
+
+    return error;
+}
+
+struct ovsdb_error *
+ovsdb_syntax_error(const struct json *json, const char *tag,
+                   const char *details, ...)
+{
+    struct ovsdb_error *error;
+    va_list args;
+
+    va_start(args, details);
+    error = ovsdb_error_valist(tag ? tag : "syntax error", details, args);
+    va_end(args);
+
+    if (json) {
+        /* XXX this is much too much information in some cases */
+        error->syntax = json_to_string(json, 0);
+    }
+
+    return error;
+}
+
+struct ovsdb_error *
+ovsdb_wrap_error(struct ovsdb_error *error, const char *details, ...)
+{
+    va_list args;
+    char *msg;
+
+    va_start(args, details);
+    msg = xvasprintf(details, args);
+    va_end(args);
+
+    if (error->details) {
+        char *new = xasprintf("%s: %s", msg, error->details);
+        free(error->details);
+        error->details = new;
+        free(msg);
+    } else {
+        error->details = msg;
+    }
+
+    return error;
+}
+
+struct ovsdb_error *
+ovsdb_internal_error(const char *file, int line, const char *details, ...)
+{
+    struct ds ds = DS_EMPTY_INITIALIZER;
+    struct backtrace backtrace;
+    struct ovsdb_error *error;
+    va_list args;
+
+    ds_put_format(&ds, "%s:%d:", file, line);
+
+    if (details) {
+        ds_put_char(&ds, ' ');
+        va_start(args, details);
+        ds_put_format_valist(&ds, details, args);
+        va_end(args);
+    }
+
+    backtrace_capture(&backtrace);
+    if (backtrace.n_frames) {
+        int i;
+
+        ds_put_cstr(&ds, " (backtrace:");
+        for (i = 0; i < backtrace.n_frames; i++) {
+            ds_put_format(&ds, " 0x%08"PRIxPTR, backtrace.frames[i]);
+        }
+        ds_put_char(&ds, ')');
+    }
+
+    ds_put_format(&ds, " (%s %s%s)", program_name, VERSION, BUILDNR);
+
+    error = ovsdb_error("internal error", "%s", ds_cstr(&ds));
+
+    ds_destroy(&ds);
+
+    return error;
+}
+
+void
+ovsdb_error_destroy(struct ovsdb_error *error)
+{
+    if (error) {
+        free(error->details);
+        free(error->syntax);
+        free(error);
+    }
+}
+
+struct ovsdb_error *
+ovsdb_error_clone(const struct ovsdb_error *old)
+{
+    if (old) {
+        struct ovsdb_error *new = xmalloc(sizeof *new);
+        new->tag = old->tag;
+        new->details = old->details ? xstrdup(old->details) : NULL;
+        new->syntax = old->syntax ? xstrdup(old->syntax) : NULL;
+        new->errno_ = old->errno_;
+        return new;
+    } else {
+        return NULL;
+    }
+}
+
+static const char *
+ovsdb_errno_string(int error)
+{
+    return error == EOF ? "unexpected end of file" : strerror(error);
+}
+
+struct json *
+ovsdb_error_to_json(const struct ovsdb_error *error)
+{
+    struct json *json = json_object_create();
+    json_object_put_string(json, "error", error->tag);
+    if (error->details) {
+        json_object_put_string(json, "details", error->details);
+    }
+    if (error->syntax) {
+        json_object_put_string(json, "syntax", error->syntax);
+    }
+    if (error->errno_) {
+        json_object_put_string(json, "io-error",
+                               ovsdb_errno_string(error->errno_));
+    }
+    return json;
+}
+
+char *
+ovsdb_error_to_string(const struct ovsdb_error *error)
+{
+    struct ds ds = DS_EMPTY_INITIALIZER;
+    if (error->syntax) {
+        ds_put_format(&ds, "syntax \"%s\": ", error->syntax);
+    }
+    ds_put_cstr(&ds, error->tag);
+    if (error->details) {
+        ds_put_format(&ds, ": %s", error->details);
+    }
+    if (error->errno_) {
+        ds_put_format(&ds, " (%s)", ovsdb_errno_string(error->errno_));
+    }
+    return ds_steal_cstr(&ds);
+}
+
+const char *
+ovsdb_error_get_tag(const struct ovsdb_error *error)
+{
+    return error->tag;
+}