services.h

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/*
 * Copyright 2010-2023 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_SERVICES__H
#  define PCMK__CRM_SERVICES__H


#  include <glib.h>
#  include <stdio.h>
#  include <stdint.h>
#  include <string.h>
#  include <stdbool.h>
#  include <sys/types.h>

#  include <crm_config.h>       // OCF_ROOT_DIR
#  include <crm/common/agents.h>
#  include <crm/common/results.h>

#ifdef __cplusplus
extern "C" {
#endif

/* TODO: Autodetect these two ?*/
#  ifndef SYSTEMCTL
#    define SYSTEMCTL "/bin/systemctl"
#  endif

/* This is the string passed in the OCF_EXIT_REASON_PREFIX environment variable.
 * The stderr output that occurs after this prefix is encountered is considered
 * the exit reason for a completed operation.
 */
#define PCMK_OCF_REASON_PREFIX "ocf-exit-reason:"

// Agent version to use if agent doesn't specify one
#define PCMK_DEFAULT_AGENT_VERSION "0.1"

enum lsb_exitcode {
    PCMK_LSB_OK                  = 0,
    PCMK_LSB_UNKNOWN_ERROR       = 1,
    PCMK_LSB_INVALID_PARAM       = 2,
    PCMK_LSB_UNIMPLEMENT_FEATURE = 3,
    PCMK_LSB_INSUFFICIENT_PRIV   = 4,
    PCMK_LSB_NOT_INSTALLED       = 5,
    PCMK_LSB_NOT_CONFIGURED      = 6,
    PCMK_LSB_NOT_RUNNING         = 7,
};

// LSB uses different return codes for status actions
enum lsb_status_exitcode {
    PCMK_LSB_STATUS_OK             = 0,
    PCMK_LSB_STATUS_VAR_PID        = 1,
    PCMK_LSB_STATUS_VAR_LOCK       = 2,
    PCMK_LSB_STATUS_NOT_RUNNING    = 3,
    PCMK_LSB_STATUS_UNKNOWN        = 4,

    /* custom codes should be in the 150-199 range reserved for application use */
    PCMK_LSB_STATUS_NOT_INSTALLED      = 150,
    PCMK_LSB_STATUS_INSUFFICIENT_PRIV  = 151,
};


enum nagios_exitcode {
    NAGIOS_STATE_OK        = 0,
    NAGIOS_STATE_WARNING   = 1,
    NAGIOS_STATE_CRITICAL  = 2,
    NAGIOS_STATE_UNKNOWN   = 3,

    /* This is a custom Pacemaker value (not a nagios convention), used as an
     * intermediate value between the services library and the executor, so the
     * executor can map it to the corresponding OCF code.
     */
    NAGIOS_INSUFFICIENT_PRIV = 100,

#if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
    NAGIOS_STATE_DEPENDENT   = 4,
    NAGIOS_NOT_INSTALLED     = 101,
#endif
};


enum svc_action_flags {
    /* On timeout, only kill pid, do not kill entire pid group */
    SVC_ACTION_LEAVE_GROUP = 0x01,
    SVC_ACTION_NON_BLOCKED = 0x02,
};

typedef struct svc_action_private_s svc_action_private_t;

/*
 * NOTE: Internally, services__create_resource_action() is preferable to
 * resources_action_create().
 */
typedef struct svc_action_s {
    char *id;

    char *rsc;

    char *action;

    guint interval_ms;

    char *standard;

    char *provider;

    char *agent;

    int timeout;    

    GHashTable *params;

    int rc;         

    int pid;        // Process ID of child
    int cancel;     // Whether this is a cancellation of a recurring action

    int status;     

    int sequence;

    int expected_rc;    // Unused
    int synchronous;    // Whether execution should be synchronous (blocking)

    enum svc_action_flags flags;    
    char *stderr_data;              
    char *stdout_data;              
    void *cb_data;                  

    svc_action_private_t *opaque;
} svc_action_t;

GList *get_directory_list(const char *root, gboolean files,
                          gboolean executable);

GList *resources_list_providers(const char *standard);

GList *resources_list_agents(const char *standard, const char *provider);

GList *resources_list_standards(void);

gboolean resources_agent_exists(const char *standard, const char *provider,
                                const char *agent);

svc_action_t *resources_action_create(const char *name, const char *standard,
                                      const char *provider, const char *agent,
                                      const char *action, guint interval_ms,
                                      int timeout, GHashTable *params,
                                      enum svc_action_flags flags);

gboolean services_action_kick(const char *name, const char *action,
                              guint interval_ms);

const char *resources_find_service_class(const char *agent);

svc_action_t *services_action_create_generic(const char *exec,
                                             const char *args[]);

void services_action_cleanup(svc_action_t *op);
void services_action_free(svc_action_t *op);
int services_action_user(svc_action_t *op, const char *user);
gboolean services_action_sync(svc_action_t *op);

gboolean services_action_async_fork_notify(svc_action_t *op,
        void (*action_callback) (svc_action_t *),
        void (*action_fork_callback) (svc_action_t *));

gboolean services_action_async(svc_action_t *op,
                               void (*action_callback) (svc_action_t *));

gboolean services_action_cancel(const char *name, const char *action,
                                guint interval_ms);

/* functions for alert agents */
svc_action_t *services_alert_create(const char *id, const char *exec,
                                   int timeout, GHashTable *params,
                                   int sequence, void *cb_data);
gboolean services_alert_async(svc_action_t *action,
                              void (*cb)(svc_action_t *op));

enum ocf_exitcode services_result2ocf(const char *standard, const char *action,
                                      int exit_status);

    static inline const char *services_ocf_exitcode_str(enum ocf_exitcode code) {
        switch (code) {
            case PCMK_OCF_OK:
                return "ok";
            case PCMK_OCF_UNKNOWN_ERROR:
                return "error";
            case PCMK_OCF_INVALID_PARAM:
                return "invalid parameter";
            case PCMK_OCF_UNIMPLEMENT_FEATURE:
                return "unimplemented feature";
            case PCMK_OCF_INSUFFICIENT_PRIV:
                return "insufficient privileges";
            case PCMK_OCF_NOT_INSTALLED:
                return "not installed";
            case PCMK_OCF_NOT_CONFIGURED:
                return "not configured";
            case PCMK_OCF_NOT_RUNNING:
                return "not running";
            case PCMK_OCF_RUNNING_PROMOTED:
                return "promoted";
            case PCMK_OCF_FAILED_PROMOTED:
                return "promoted (failed)";
            case PCMK_OCF_DEGRADED:
                return "OCF_DEGRADED";
            case PCMK_OCF_DEGRADED_PROMOTED:
                return "promoted (degraded)";

#if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
            case PCMK_OCF_NOT_SUPPORTED:
                return "not supported (DEPRECATED STATUS)";
            case PCMK_OCF_CANCELLED:
                return "cancelled (DEPRECATED STATUS)";
            case PCMK_OCF_OTHER_ERROR:
                return "other error (DEPRECATED STATUS)";
            case PCMK_OCF_SIGNAL:
                return "interrupted by signal (DEPRECATED STATUS)";
            case PCMK_OCF_PENDING:
                return "pending (DEPRECATED STATUS)";
            case PCMK_OCF_TIMEOUT:
                return "timeout (DEPRECATED STATUS)";
#endif
            default:
                return "unknown";
        }
    }

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

#  ifdef __cplusplus
}
#  endif

#endif                          /* __PCMK_SERVICES__ */