lrmd.h

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/*
 * Copyright 2012-2024 the Pacemaker project contributors
 *
 * The version control history for this file may have further details.
 *
 * This source code is licensed under the GNU Lesser General Public License
 * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
 */

#ifndef PCMK__CRM_LRMD__H
#  define PCMK__CRM_LRMD__H

#include <stdbool.h>      // bool
#include <glib.h>         // guint, GList
#include <crm_config.h>
#include <crm/lrmd_events.h>
#include <crm/services.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct lrmd_s lrmd_t;
typedef struct lrmd_key_value_s {
    char *key;
    char *value;
    struct lrmd_key_value_s *next;
} lrmd_key_value_t;

/* The major version should be bumped every time there is an incompatible
 * change that prevents older clients from connecting to this version of
 * the server.  The minor version indicates feature support.
 *
 * Protocol  Pacemaker  Significant changes
 * --------  ---------  -------------------
 *   1.2       2.1.8    PCMK__CIB_REQUEST_SCHEMAS
 */
#define LRMD_PROTOCOL_VERSION "1.2"

#define LRMD_SUPPORTS_SCHEMA_XFER(x) (compare_version((x), "1.2") >= 0)

/* The major protocol version the client and server both need to support for
 * the connection to be successful.  This should only ever be the major
 * version - not a complete version number.
 */
#define LRMD_COMPATIBLE_PROTOCOL "1"

/* \deprecated Do not use (will be removed in a future release)
 *
 * This is the version that the client version will actually be compared
 * against. This should be identical to LRMD_PROTOCOL_VERSION. However, we
 * accidentally bumped LRMD_PROTOCOL_VERSION in 6424a647 (1.1.15) when we didn't
 * need to, so for now it's different. If we ever have a truly incompatible
 * bump, we can drop this and compare against LRMD_PROTOCOL_VERSION.
 */
#define LRMD_MIN_PROTOCOL_VERSION "1.0"

/* *INDENT-OFF* */
#define DEFAULT_REMOTE_KEY_LOCATION PACEMAKER_CONFIG_DIR "/authkey"
#define ALT_REMOTE_KEY_LOCATION "/etc/corosync/authkey"
#define DEFAULT_REMOTE_PORT 3121
#define DEFAULT_REMOTE_USERNAME "lrmd"

#define LRMD_OP_RSC_REG           "lrmd_rsc_register"
#define LRMD_OP_RSC_EXEC          "lrmd_rsc_exec"
#define LRMD_OP_RSC_CANCEL        "lrmd_rsc_cancel"
#define LRMD_OP_RSC_UNREG         "lrmd_rsc_unregister"
#define LRMD_OP_RSC_INFO          "lrmd_rsc_info"
#define LRMD_OP_RSC_METADATA      "lrmd_rsc_metadata"
#define LRMD_OP_POKE              "lrmd_rsc_poke"
#define LRMD_OP_NEW_CLIENT        "lrmd_rsc_new_client"
#define LRMD_OP_CHECK             "lrmd_check"
#define LRMD_OP_ALERT_EXEC        "lrmd_alert_exec"
#define LRMD_OP_GET_RECURRING     "lrmd_get_recurring"

#define LRMD_IPC_OP_NEW           "new"
#define LRMD_IPC_OP_DESTROY       "destroy"
#define LRMD_IPC_OP_EVENT         "event"
#define LRMD_IPC_OP_REQUEST       "request"
#define LRMD_IPC_OP_RESPONSE      "response"
#define LRMD_IPC_OP_SHUTDOWN_REQ  "shutdown_req"
#define LRMD_IPC_OP_SHUTDOWN_ACK  "shutdown_ack"
#define LRMD_IPC_OP_SHUTDOWN_NACK "shutdown_nack"
/* *INDENT-ON* */

lrmd_t *lrmd_api_new(void);

lrmd_t *lrmd_remote_api_new(const char *nodename, const char *server, int port);

bool lrmd_dispatch(lrmd_t *lrmd);

int lrmd_poll(lrmd_t *lrmd, int timeout);

void lrmd_api_delete(lrmd_t *lrmd);

lrmd_key_value_t *lrmd_key_value_add(lrmd_key_value_t * kvp, const char *key, const char *value);

enum lrmd_call_options {
    lrmd_opt_none                   = 0,

    lrmd_opt_notify_orig_only       = (1 << 1),

    lrmd_opt_drop_recurring         = 0x00000003,

    lrmd_opt_notify_changes_only    = (1 << 2),
};

typedef struct lrmd_rsc_info_s {
    char *id;
    char *type;
    char *standard;
    char *provider;
} lrmd_rsc_info_t;

typedef struct lrmd_op_info_s {
    char *rsc_id;
    char *action;
    char *interval_ms_s;
    char *timeout_ms_s;
} lrmd_op_info_t;

lrmd_rsc_info_t *lrmd_new_rsc_info(const char *rsc_id, const char *standard,
                                   const char *provider, const char *type);
lrmd_rsc_info_t *lrmd_copy_rsc_info(lrmd_rsc_info_t * rsc_info);
void lrmd_free_rsc_info(lrmd_rsc_info_t * rsc_info);
void lrmd_free_op_info(lrmd_op_info_t *op_info);

typedef void (*lrmd_event_callback) (lrmd_event_data_t * event);

typedef struct lrmd_list_s {
    const char *val;
    struct lrmd_list_s *next;
} lrmd_list_t;

void lrmd_list_freeall(lrmd_list_t * head);
void lrmd_key_value_freeall(lrmd_key_value_t * head);

typedef struct lrmd_api_operations_s {
    int (*connect) (lrmd_t *lrmd, const char *client_name, int *fd);

    int (*connect_async) (lrmd_t *lrmd, const char *client_name,
                          int timeout /*ms */ );

    int (*is_connected) (lrmd_t *lrmd);

    int (*poke_connection) (lrmd_t *lrmd);

    int (*disconnect) (lrmd_t *lrmd);

    int (*register_rsc) (lrmd_t *lrmd, const char *rsc_id, const char *standard,
                         const char *provider, const char *agent,
                         enum lrmd_call_options options);

    lrmd_rsc_info_t *(*get_rsc_info) (lrmd_t *lrmd, const char *rsc_id,
                                      enum lrmd_call_options options);

    int (*get_recurring_ops) (lrmd_t *lrmd, const char *rsc_id, int timeout_ms,
                              enum lrmd_call_options options, GList **output);

    int (*unregister_rsc) (lrmd_t *lrmd, const char *rsc_id,
                           enum lrmd_call_options options);

    void (*set_callback) (lrmd_t *lrmd, lrmd_event_callback callback);

    int (*exec) (lrmd_t *lrmd, const char *rsc_id, const char *action,
                 const char *userdata, guint interval_ms, int timeout,
                 int start_delay, enum lrmd_call_options options,
                 lrmd_key_value_t *params);

    int (*cancel) (lrmd_t *lrmd, const char *rsc_id, const char *action,
                   guint interval_ms);

    int (*get_metadata) (lrmd_t *lrmd, const char *standard,
                         const char *provider, const char *agent,
                         char **output, enum lrmd_call_options options);

    int (*list_agents) (lrmd_t *lrmd, lrmd_list_t **agents,
                        const char *standard, const char *provider);

    int (*list_ocf_providers) (lrmd_t *lrmd, const char *agent,
                               lrmd_list_t **providers);

    int (*list_standards) (lrmd_t *lrmd, lrmd_list_t **standards);

    int (*exec_alert) (lrmd_t *lrmd, const char *alert_id,
                       const char *alert_path, int timeout,
                       lrmd_key_value_t *params);

    int (*get_metadata_params) (lrmd_t *lrmd, const char *standard,
                                const char *provider, const char *agent,
                                char **output, enum lrmd_call_options options,
                                lrmd_key_value_t *params);

} lrmd_api_operations_t;

struct lrmd_s {
    lrmd_api_operations_t *cmds;
    void *lrmd_private;
};

static inline const char *
lrmd_event_type2str(enum lrmd_callback_event type)
{
    switch (type) {
        case lrmd_event_register:
            return "register";
        case lrmd_event_unregister:
            return "unregister";
        case lrmd_event_exec_complete:
            return "exec_complete";
        case lrmd_event_disconnect:
            return "disconnect";
        case lrmd_event_connect:
            return "connect";
        case lrmd_event_poke:
            return "poke";
        case lrmd_event_new_client:
            return "new_client";
    }
    return "unknown";
}

#if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
#include <crm/lrmd_compat.h>
#endif

#ifdef __cplusplus
}
#endif

#endif