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/*
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* QError Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "monitor.h" |
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#include "qjson.h" |
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#include "qerror.h" |
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#include "qemu-common.h" |
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static void qerror_destroy_obj(QObject *obj); |
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static const QType qerror_type = { |
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.code = QTYPE_QERROR, |
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.destroy = qerror_destroy_obj, |
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}; |
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/**
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* The 'desc' parameter is a printf-like string, the format of the format
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* string is:
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*
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* %(KEY)
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*
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* Where KEY is a QDict key, which has to be passed to qerror_from_info().
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*
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* Example:
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*
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* "foo error on device: %(device) slot: %(slot_nr)"
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*
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* A single percent sign can be printed if followed by a second one,
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* for example:
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*
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* "running out of foo: %(foo)%%"
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*
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* Please keep the entries in alphabetical order.
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* Use scripts/check-qerror.sh to check.
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*/
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static const QErrorStringTable qerror_table[] = { |
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{ |
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.error_fmt = QERR_ADD_CLIENT_FAILED, |
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.desc = "Could not add client",
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}, |
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{ |
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.error_fmt = QERR_BAD_BUS_FOR_DEVICE, |
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.desc = "Device '%(device)' can't go on a %(bad_bus_type) bus",
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}, |
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{ |
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.error_fmt = QERR_BASE_NOT_FOUND, |
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.desc = "Base '%(base)' not found",
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}, |
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{ |
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.error_fmt = QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
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.desc = "Block format '%(format)' used by device '%(name)' does not support feature '%(feature)'",
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}, |
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{ |
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.error_fmt = QERR_BUS_NO_HOTPLUG, |
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.desc = "Bus '%(bus)' does not support hotplugging",
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}, |
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{ |
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.error_fmt = QERR_BUS_NOT_FOUND, |
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.desc = "Bus '%(bus)' not found",
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}, |
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{ |
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.error_fmt = QERR_COMMAND_DISABLED, |
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.desc = "The command %(name) has been disabled for this instance",
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}, |
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{ |
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.error_fmt = QERR_COMMAND_NOT_FOUND, |
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.desc = "The command %(name) has not been found",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_ENCRYPTED, |
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.desc = "Device '%(device)' is encrypted",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, |
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.desc = "Migration is disabled when using feature '%(feature)' in device '%(device)'",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_HAS_NO_MEDIUM, |
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.desc = "Device '%(device)' has no medium",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_INIT_FAILED, |
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.desc = "Device '%(device)' could not be initialized",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_IN_USE, |
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.desc = "Device '%(device)' is in use",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_IS_READ_ONLY, |
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.desc = "Device '%(device)' is read only",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_LOCKED, |
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.desc = "Device '%(device)' is locked",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_MULTIPLE_BUSSES, |
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.desc = "Device '%(device)' has multiple child busses",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_NO_BUS, |
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.desc = "Device '%(device)' has no child bus",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_NO_HOTPLUG, |
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.desc = "Device '%(device)' does not support hotplugging",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_NOT_ACTIVE, |
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.desc = "Device '%(device)' has not been activated",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_NOT_ENCRYPTED, |
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.desc = "Device '%(device)' is not encrypted",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_NOT_FOUND, |
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.desc = "Device '%(device)' not found",
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}, |
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{ |
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.error_fmt = QERR_DEVICE_NOT_REMOVABLE, |
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.desc = "Device '%(device)' is not removable",
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}, |
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{ |
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.error_fmt = QERR_DUPLICATE_ID, |
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.desc = "Duplicate ID '%(id)' for %(object)",
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}, |
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{ |
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.error_fmt = QERR_FD_NOT_FOUND, |
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.desc = "File descriptor named '%(name)' not found",
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}, |
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{ |
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.error_fmt = QERR_FD_NOT_SUPPLIED, |
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.desc = "No file descriptor supplied via SCM_RIGHTS",
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}, |
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{ |
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.error_fmt = QERR_FEATURE_DISABLED, |
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.desc = "The feature '%(name)' is not enabled",
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}, |
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{ |
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.error_fmt = QERR_INVALID_BLOCK_FORMAT, |
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.desc = "Invalid block format '%(name)'",
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}, |
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{ |
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.error_fmt = QERR_INVALID_PARAMETER, |
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.desc = "Invalid parameter '%(name)'",
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}, |
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{ |
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.error_fmt = QERR_INVALID_PARAMETER_COMBINATION, |
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.desc = "Invalid parameter combination",
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}, |
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{ |
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.error_fmt = QERR_INVALID_PARAMETER_TYPE, |
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.desc = "Invalid parameter type, expected: %(expected)",
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}, |
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{ |
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.error_fmt = QERR_INVALID_PARAMETER_VALUE, |
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.desc = "Parameter '%(name)' expects %(expected)",
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}, |
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{ |
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.error_fmt = QERR_INVALID_PASSWORD, |
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.desc = "Password incorrect",
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}, |
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{ |
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.error_fmt = QERR_IO_ERROR, |
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.desc = "An IO error has occurred",
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}, |
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{ |
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.error_fmt = QERR_JSON_PARSE_ERROR, |
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.desc = "JSON parse error, %(message)",
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}, |
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{ |
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.error_fmt = QERR_JSON_PARSING, |
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.desc = "Invalid JSON syntax",
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}, |
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{ |
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.error_fmt = QERR_KVM_MISSING_CAP, |
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.desc = "Using KVM without %(capability), %(feature) unavailable",
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}, |
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{ |
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.error_fmt = QERR_MIGRATION_EXPECTED, |
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.desc = "An incoming migration is expected before this command can be executed",
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}, |
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{ |
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.error_fmt = QERR_MISSING_PARAMETER, |
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.desc = "Parameter '%(name)' is missing",
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}, |
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{ |
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.error_fmt = QERR_NO_BUS_FOR_DEVICE, |
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.desc = "No '%(bus)' bus found for device '%(device)'",
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}, |
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{ |
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.error_fmt = QERR_NOT_SUPPORTED, |
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.desc = "Not supported",
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}, |
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{ |
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.error_fmt = QERR_OPEN_FILE_FAILED, |
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.desc = "Could not open '%(filename)'",
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}, |
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{ |
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.error_fmt = QERR_PERMISSION_DENIED, |
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.desc = "Insufficient permission to perform this operation",
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}, |
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{ |
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.error_fmt = QERR_PROPERTY_NOT_FOUND, |
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.desc = "Property '%(device).%(property)' not found",
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}, |
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{ |
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.error_fmt = QERR_PROPERTY_VALUE_BAD, |
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.desc = "Property '%(device).%(property)' doesn't take value '%(value)'",
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}, |
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{ |
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.error_fmt = QERR_PROPERTY_VALUE_IN_USE, |
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.desc = "Property '%(device).%(property)' can't take value '%(value)', it's in use",
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}, |
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{ |
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.error_fmt = QERR_PROPERTY_VALUE_NOT_FOUND, |
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.desc = "Property '%(device).%(property)' can't find value '%(value)'",
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}, |
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{ |
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.error_fmt = QERR_PROPERTY_VALUE_OUT_OF_RANGE, |
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.desc = "Property '%(device).%(property)' doesn't take "
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"value %(value) (minimum: %(min), maximum: %(max)'",
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}, |
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{ |
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.error_fmt = QERR_QGA_COMMAND_FAILED, |
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.desc = "Guest agent command failed, error was '%(message)'",
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}, |
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{ |
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.error_fmt = QERR_QGA_LOGGING_FAILED, |
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.desc = "Guest agent failed to log non-optional log statement",
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}, |
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{ |
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.error_fmt = QERR_QMP_BAD_INPUT_OBJECT, |
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.desc = "Expected '%(expected)' in QMP input",
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}, |
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{ |
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.error_fmt = QERR_QMP_BAD_INPUT_OBJECT_MEMBER, |
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.desc = "QMP input object member '%(member)' expects '%(expected)'",
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}, |
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{ |
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.error_fmt = QERR_QMP_EXTRA_MEMBER, |
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.desc = "QMP input object member '%(member)' is unexpected",
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}, |
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{ |
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.error_fmt = QERR_RESET_REQUIRED, |
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.desc = "Resetting the Virtual Machine is required",
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}, |
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{ |
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.error_fmt = QERR_SET_PASSWD_FAILED, |
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.desc = "Could not set password",
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}, |
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{ |
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.error_fmt = QERR_TOO_MANY_FILES, |
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.desc = "Too many open files",
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}, |
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{ |
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.error_fmt = QERR_UNDEFINED_ERROR, |
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.desc = "An undefined error has occurred",
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}, |
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{ |
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.error_fmt = QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, |
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.desc = "'%(device)' uses a %(format) feature which is not "
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"supported by this qemu version: %(feature)",
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}, |
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{ |
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.error_fmt = QERR_UNSUPPORTED, |
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.desc = "this feature or command is not currently supported",
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}, |
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{ |
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.error_fmt = QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION, |
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.desc = "Migration is disabled when VirtFS export path '%(path)' "
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"is mounted in the guest using mount_tag '%(tag)'",
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}, |
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{ |
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.error_fmt = QERR_VNC_SERVER_FAILED, |
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.desc = "Could not start VNC server on %(target)",
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}, |
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{} |
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}; |
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/**
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* qerror_new(): Create a new QError
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*
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* Return strong reference.
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*/
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QError *qerror_new(void)
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{ |
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QError *qerr; |
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qerr = g_malloc0(sizeof(*qerr));
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QOBJECT_INIT(qerr, &qerror_type); |
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return qerr;
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} |
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static void GCC_FMT_ATTR(2, 3) qerror_abort(const QError *qerr, |
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const char *fmt, ...) |
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{ |
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va_list ap; |
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fprintf(stderr, "qerror: bad call in function '%s':\n", qerr->func);
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fprintf(stderr, "qerror: -> ");
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va_start(ap, fmt); |
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vfprintf(stderr, fmt, ap); |
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va_end(ap); |
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fprintf(stderr, "\nqerror: call at %s:%d\n", qerr->file, qerr->linenr);
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abort(); |
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} |
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static void GCC_FMT_ATTR(2, 0) qerror_set_data(QError *qerr, |
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const char *fmt, va_list *va) |
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{ |
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QObject *obj; |
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obj = qobject_from_jsonv(fmt, va); |
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if (!obj) {
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qerror_abort(qerr, "invalid format '%s'", fmt);
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} |
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if (qobject_type(obj) != QTYPE_QDICT) {
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qerror_abort(qerr, "error format is not a QDict '%s'", fmt);
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} |
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qerr->error = qobject_to_qdict(obj); |
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obj = qdict_get(qerr->error, "class");
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if (!obj) {
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qerror_abort(qerr, "missing 'class' key in '%s'", fmt);
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} |
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if (qobject_type(obj) != QTYPE_QSTRING) {
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qerror_abort(qerr, "'class' key value should be a QString");
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} |
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obj = qdict_get(qerr->error, "data");
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if (!obj) {
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qerror_abort(qerr, "missing 'data' key in '%s'", fmt);
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} |
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if (qobject_type(obj) != QTYPE_QDICT) {
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qerror_abort(qerr, "'data' key value should be a QDICT");
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} |
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} |
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static void qerror_set_desc(QError *qerr, const char *fmt) |
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{ |
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int i;
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// FIXME: inefficient loop
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for (i = 0; qerror_table[i].error_fmt; i++) { |
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if (strcmp(qerror_table[i].error_fmt, fmt) == 0) { |
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qerr->entry = &qerror_table[i]; |
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return;
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} |
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} |
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qerror_abort(qerr, "error format '%s' not found", fmt);
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} |
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/**
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* qerror_from_info(): Create a new QError from error information
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*
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* The information consists of:
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*
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* - file the file name of where the error occurred
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* - linenr the line number of where the error occurred
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* - func the function name of where the error occurred
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* - fmt JSON printf-like dictionary, there must exist keys 'class' and
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* 'data'
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* - va va_list of all arguments specified by fmt
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*
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* Return strong reference.
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*/
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QError *qerror_from_info(const char *file, int linenr, const char *func, |
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const char *fmt, va_list *va) |
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{ |
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QError *qerr; |
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qerr = qerror_new(); |
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loc_save(&qerr->loc); |
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qerr->linenr = linenr; |
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qerr->file = file; |
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qerr->func = func; |
396 |
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if (!fmt) {
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qerror_abort(qerr, "QDict not specified");
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} |
400 |
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qerror_set_data(qerr, fmt, va); |
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qerror_set_desc(qerr, fmt); |
403 |
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return qerr;
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} |
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static void parse_error(const QErrorStringTable *entry, int c) |
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{ |
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fprintf(stderr, "expected '%c' in '%s'", c, entry->desc);
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abort(); |
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} |
412 |
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static const char *append_field(QDict *error, QString *outstr, |
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const QErrorStringTable *entry,
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const char *start) |
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{ |
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QObject *obj; |
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QDict *qdict; |
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QString *key_qs; |
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const char *end, *key; |
421 |
|
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if (*start != '%') |
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parse_error(entry, '%');
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start++; |
425 |
if (*start != '(') |
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parse_error(entry, '(');
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start++; |
428 |
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end = strchr(start, ')');
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430 |
if (!end)
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parse_error(entry, ')');
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|
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key_qs = qstring_from_substr(start, 0, end - start - 1); |
434 |
key = qstring_get_str(key_qs); |
435 |
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qdict = qobject_to_qdict(qdict_get(error, "data"));
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437 |
obj = qdict_get(qdict, key); |
438 |
if (!obj) {
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abort(); |
440 |
} |
441 |
|
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switch (qobject_type(obj)) {
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case QTYPE_QSTRING:
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qstring_append(outstr, qdict_get_str(qdict, key)); |
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break;
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case QTYPE_QINT:
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qstring_append_int(outstr, qdict_get_int(qdict, key)); |
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break;
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default:
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abort(); |
451 |
} |
452 |
|
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QDECREF(key_qs); |
454 |
return ++end;
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} |
456 |
|
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static QString *qerror_format_desc(QDict *error,
|
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const QErrorStringTable *entry)
|
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{ |
460 |
QString *qstring; |
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const char *p; |
462 |
|
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assert(entry != NULL);
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464 |
|
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qstring = qstring_new(); |
466 |
|
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for (p = entry->desc; *p != '\0';) { |
468 |
if (*p != '%') { |
469 |
qstring_append_chr(qstring, *p++); |
470 |
} else if (*(p + 1) == '%') { |
471 |
qstring_append_chr(qstring, '%');
|
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p += 2;
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473 |
} else {
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p = append_field(error, qstring, entry, p); |
475 |
} |
476 |
} |
477 |
|
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return qstring;
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} |
480 |
|
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QString *qerror_format(const char *fmt, QDict *error) |
482 |
{ |
483 |
const QErrorStringTable *entry = NULL; |
484 |
int i;
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485 |
|
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for (i = 0; qerror_table[i].error_fmt; i++) { |
487 |
if (strcmp(qerror_table[i].error_fmt, fmt) == 0) { |
488 |
entry = &qerror_table[i]; |
489 |
break;
|
490 |
} |
491 |
} |
492 |
|
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return qerror_format_desc(error, entry);
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} |
495 |
|
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/**
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* qerror_human(): Format QError data into human-readable string.
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*/
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QString *qerror_human(const QError *qerror)
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{ |
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return qerror_format_desc(qerror->error, qerror->entry);
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} |
503 |
|
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/**
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* qerror_print(): Print QError data
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*
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* This function will print the member 'desc' of the specified QError object,
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* it uses error_report() for this, so that the output is routed to the right
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* place (ie. stderr or Monitor's device).
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*/
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void qerror_print(QError *qerror)
|
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{ |
513 |
QString *qstring = qerror_human(qerror); |
514 |
loc_push_restore(&qerror->loc); |
515 |
error_report("%s", qstring_get_str(qstring));
|
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loc_pop(&qerror->loc); |
517 |
QDECREF(qstring); |
518 |
} |
519 |
|
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void qerror_report_internal(const char *file, int linenr, const char *func, |
521 |
const char *fmt, ...) |
522 |
{ |
523 |
va_list va; |
524 |
QError *qerror; |
525 |
|
526 |
va_start(va, fmt); |
527 |
qerror = qerror_from_info(file, linenr, func, fmt, &va); |
528 |
va_end(va); |
529 |
|
530 |
if (monitor_cur_is_qmp()) {
|
531 |
monitor_set_error(cur_mon, qerror); |
532 |
} else {
|
533 |
qerror_print(qerror); |
534 |
QDECREF(qerror); |
535 |
} |
536 |
} |
537 |
|
538 |
/* Evil... */
|
539 |
struct Error
|
540 |
{ |
541 |
QDict *obj; |
542 |
const char *fmt; |
543 |
char *msg;
|
544 |
}; |
545 |
|
546 |
void qerror_report_err(Error *err)
|
547 |
{ |
548 |
QError *qerr; |
549 |
int i;
|
550 |
|
551 |
qerr = qerror_new(); |
552 |
loc_save(&qerr->loc); |
553 |
QINCREF(err->obj); |
554 |
qerr->error = err->obj; |
555 |
|
556 |
for (i = 0; qerror_table[i].error_fmt; i++) { |
557 |
if (strcmp(qerror_table[i].error_fmt, err->fmt) == 0) { |
558 |
qerr->entry = &qerror_table[i]; |
559 |
break;
|
560 |
} |
561 |
} |
562 |
|
563 |
if (monitor_cur_is_qmp()) {
|
564 |
monitor_set_error(cur_mon, qerr); |
565 |
} else {
|
566 |
qerror_print(qerr); |
567 |
QDECREF(qerr); |
568 |
} |
569 |
} |
570 |
|
571 |
/**
|
572 |
* qobject_to_qerror(): Convert a QObject into a QError
|
573 |
*/
|
574 |
QError *qobject_to_qerror(const QObject *obj)
|
575 |
{ |
576 |
if (qobject_type(obj) != QTYPE_QERROR) {
|
577 |
return NULL; |
578 |
} |
579 |
|
580 |
return container_of(obj, QError, base);
|
581 |
} |
582 |
|
583 |
/**
|
584 |
* qerror_destroy_obj(): Free all memory allocated by a QError
|
585 |
*/
|
586 |
static void qerror_destroy_obj(QObject *obj) |
587 |
{ |
588 |
QError *qerr; |
589 |
|
590 |
assert(obj != NULL);
|
591 |
qerr = qobject_to_qerror(obj); |
592 |
|
593 |
QDECREF(qerr->error); |
594 |
g_free(qerr); |
595 |
} |