255 lines
8.2 KiB
C
255 lines
8.2 KiB
C
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file module_command.h Module driven commands
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*
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* This header describes the structures and functions used to register new
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* functions for modules. It allows modules to introduce custom commands that
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* are registered into a module specific domain. These commands can then be
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* accessed from multiple different client interfaces without implementing the
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* same functionality again.
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*/
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#include <maxscale/cdefs.h>
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#include <maxscale/dcb.h>
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#include <maxscale/filter.h>
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#include <maxscale/monitor.h>
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#include <maxscale/server.h>
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#include <maxscale/service.h>
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#include <maxscale/session.h>
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MXS_BEGIN_DECLS
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/**
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* The argument type
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*
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* First 8 bits of @c value are reserved for argument type, bits 9 through
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* 32 are reserved for argument options and bits 33 through 64 are reserved
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* for future use.
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*
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* @c description should be a human-readable description of the argument.
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*/
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typedef struct
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{
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uint64_t type; /**< The argument type */
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const char *description; /**< The argument description */
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} modulecmd_arg_type_t;
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/**
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* Argument types for the registered functions, the first 8 bits of
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* the modulecmd_arg_type_t type's @c value member. An argument can be of
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* only one type.
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*/
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#define MODULECMD_ARG_NONE 0 /**< Empty argument */
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#define MODULECMD_ARG_STRING 1 /**< String */
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#define MODULECMD_ARG_BOOLEAN 2 /**< Boolean value */
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#define MODULECMD_ARG_SERVICE 3 /**< Service name */
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#define MODULECMD_ARG_SERVER 4 /**< Server name */
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#define MODULECMD_ARG_SESSION 5 /**< SESSION pointer in string format */
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#define MODULECMD_ARG_SESSION_PTR 6 /**< Raw SESSION pointer */
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#define MODULECMD_ARG_DCB 7 /**< DCB pointer in string format*/
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#define MODULECMD_ARG_DCB_PTR 8 /**< Raw DCB pointer*/
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#define MODULECMD_ARG_MONITOR 9 /**< Monitor name */
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#define MODULECMD_ARG_FILTER 10 /**< Filter name */
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#define MODULECMD_ARG_OUTPUT 11 /**< DCB suitable for writing results to.
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This should always be the first argument
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if the function requires an output DCB. */
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/**
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* Options for arguments, bits 9 through 32
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*/
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#define MODULECMD_ARG_OPTIONAL (1 << 8) /**< The argument is optional */
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/**
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* Helper macros
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*/
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#define MODULECMD_GET_TYPE(t) ((t)->type & 0xff)
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#define MODULECMD_ARG_IS_REQUIRED(t) (((t)->type & MODULECMD_ARG_OPTIONAL) == 0)
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#define MODULECMD_ARG_PRESENT(t) (MODULECMD_GET_TYPE(t) != MODULECMD_ARG_NONE)
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/** Argument list node */
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struct arg_node
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{
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modulecmd_arg_type_t type;
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union
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{
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char *string;
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bool boolean;
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SERVICE *service;
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SERVER *server;
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SESSION *session;
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DCB *dcb;
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MONITOR *monitor;
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FILTER_DEF *filter;
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} value;
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};
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/** Argument list */
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typedef struct
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{
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int argc;
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struct arg_node *argv;
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} MODULECMD_ARG;
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/**
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* The function signature for the module commands.
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*
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* The number of arguments will always be the maximum number of arguments the
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* module requested. If an argument had the MODULECMD_ARG_OPTIONAL flag, and
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* the argument was not provided, the type of the argument will be
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* MODULECMD_ARG_NONE.
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*
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* @param argv Argument list
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* @return True on success, false on error
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*/
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typedef bool (*MODULECMDFN)(const MODULECMD_ARG *argv);
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/**
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* A registered command
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*/
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typedef struct modulecmd
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{
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char *identifier; /**< Unique identifier */
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char *domain; /**< Command domain */
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MODULECMDFN func; /**< The registered function */
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int arg_count_min; /**< Minimum number of arguments */
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int arg_count_max; /**< Maximum number of arguments */
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modulecmd_arg_type_t *arg_types; /**< Argument types */
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struct modulecmd *next; /**< Next command */
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} MODULECMD;
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/**
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* @brief Register a new command
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*
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* This function registers a new command into the domain.
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*
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* @param domain Command domain
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* @param identifier The unique identifier for this command
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* @param entry_point The actual entry point function
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* @param argc Maximum number of arguments
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* @param argv Array of argument types of size @c argc
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* @return True if the module was successfully registered, false on error
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*/
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bool modulecmd_register_command(const char *domain, const char *identifier,
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MODULECMDFN entry_point, int argc, modulecmd_arg_type_t *argv);
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/**
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* @brief Find a registered command
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*
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* @param domain Command domain
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* @param identifier Command identifier
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* @return Registered command or NULL if no command was found
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*/
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const MODULECMD* modulecmd_find_command(const char *domain, const char *identifier);
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/**
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* @brief Parse arguments for a command
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*
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* @param cmd Command for which the parameters are parsed
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* @param argc Number of arguments
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* @param argv Argument list in string format of size @c argc
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* @return Parsed arguments or NULL on error
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*/
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MODULECMD_ARG* modulecmd_arg_parse(const MODULECMD *cmd, int argc, const void **argv);
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/**
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* @brief Free parsed arguments returned by modulecmd_arg_parse
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* @param arg Arguments to free
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*/
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void modulecmd_arg_free(MODULECMD_ARG *arg);
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/**
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* @brief Check if an optional argument was defined
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*
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* This function looks the argument list @c arg at an offset of @c idx and
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* checks if the argument list contains a value for an optional argument.
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*
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* @param arg Argument list
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* @param idx Index of the argument, starts at 0
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* @return True if the optional argument is present
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*/
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bool modulecmd_arg_is_present(const MODULECMD_ARG *arg, int idx);
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/**
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* @brief Call a registered command
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*
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* This calls a registered command in a specific domain. There are no guarantees
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* on the length of the call or whether it will block. All of this depends on the
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* module and what the command does.
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*
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* @param cmd Command to call
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* @param args Parsed command arguments
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* @return True on success, false on error
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*/
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bool modulecmd_call_command(const MODULECMD *cmd, const MODULECMD_ARG *args);
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/**
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* @brief Set the current error message
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*
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* Modules that register commands should use this function to report errors.
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* This will overwrite any existing error message.
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*
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* @param format Format string
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* @param ... Format string arguments
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*/
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void modulecmd_set_error(const char *format, ...);
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/**
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* @brief Get the latest error generated by the modulecmd system
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*
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* @return Human-readable error message
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*/
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const char* modulecmd_get_error();
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/**
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* @brief Call a function for each command
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*
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* Calls a function for each matching command in the matched domains. The filters
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* for the domain and identifier are PCRE2 expressions that are matched against
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* the domain and identifier. These are optional and both @c domain and @c ident
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* can be NULL.
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*
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* @param domain_re Command domain filter, NULL for all domains
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*
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* @param ident_re Command identifier filter, NULL for all commands
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*
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* @param fn Function that is called for every command. The first parameter is
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* the current command. The second parameter is the value of @c data.
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* The function should return true to continue iteration or false to
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* stop iteration early. The function must not call any of the functions
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* declared in modulecmd.h.
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*
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* @param data User defined data passed as the second parameter to @c fn
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*
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* @return True on success, false on PCRE2 error. Use modulecmd_get_error()
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* to retrieve the error.
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*/
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bool modulecmd_foreach(const char *domain_re, const char *ident_re,
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bool(*fn)(const MODULECMD *cmd, void *data), void *data);
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/**
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* @brief Return argument type as string
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*
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* This returns the string type of @c type. The returned string must be freed
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* by the called.
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*
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* @param type Type to convert
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* @return New string or NULL on memory allocation error
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*/
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char* modulecmd_argtype_to_str(modulecmd_arg_type_t *type);
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MXS_END_DECLS
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