/*
 * Copyright 2004-2019 the Pacemaker project contributors
 *
 * The version control history for this file may have further details.
 *
 * This source code is licensed under the GNU General Public License version 2
 * or later (GPLv2+) WITHOUT ANY WARRANTY.
 */

#include <crm_internal.h>

#include <unistd.h>  /* sleep */

#include <crm/common/alerts_internal.h>
#include <crm/common/xml.h>
#include <crm/crm.h>
#include <crm/msg_xml.h>

#include <pacemaker-controld.h>

int cib_retries = 0;

static void
do_cib_updated(const char *event, xmlNode * msg)
{
    if (crm_patchset_contains_alert(msg, TRUE)) {
        mainloop_set_trigger(config_read);
    }
}

static void
do_cib_replaced(const char *event, xmlNode * msg)
{
    crm_debug("Updating the CIB after a replace: DC=%s", AM_I_DC ? "true" : "false");
    if (AM_I_DC == FALSE) {
        return;

    } else if (fsa_state == S_FINALIZE_JOIN && is_set(fsa_input_register, R_CIB_ASKED)) {
        /* no need to restart the join - we asked for this replace op */
        return;
    }

    /* start the join process again so we get everyone's LRM status */
    populate_cib_nodes(node_update_quick|node_update_all, __FUNCTION__);
    register_fsa_input(C_FSA_INTERNAL, I_ELECTION, NULL);
}

/* A_CIB_STOP, A_CIB_START, O_CIB_RESTART */
void
do_cib_control(long long action,
               enum crmd_fsa_cause cause,
               enum crmd_fsa_state cur_state,
               enum crmd_fsa_input current_input, fsa_data_t * msg_data)
{
    CRM_ASSERT(fsa_cib_conn != NULL);

    if (action & A_CIB_STOP) {

        if (fsa_cib_conn->state != cib_disconnected && last_resource_update != 0) {
            crm_info("Waiting for resource update %d to complete", last_resource_update);
            crmd_fsa_stall(FALSE);
            return;
        }

        crm_info("Disconnecting from the CIB manager");
        clear_bit(fsa_input_register, R_CIB_CONNECTED);

        fsa_cib_conn->cmds->del_notify_callback(fsa_cib_conn, T_CIB_DIFF_NOTIFY, do_cib_updated);

        if (fsa_cib_conn->state != cib_disconnected) {
            fsa_cib_conn->cmds->set_slave(fsa_cib_conn, cib_scope_local);
            fsa_cib_conn->cmds->signoff(fsa_cib_conn);
        }
        crm_notice("Disconnected from the CIB manager");
    }

    if (action & A_CIB_START) {
        int rc = pcmk_ok;

        if (cur_state == S_STOPPING) {
            crm_err("Ignoring request to connect to the CIB manager after shutdown");
            return;
        }

        rc = fsa_cib_conn->cmds->signon(fsa_cib_conn, CRM_SYSTEM_CRMD, cib_command_nonblocking);

        if (rc != pcmk_ok) {
            /* a short wait that usually avoids stalling the FSA */
            sleep(1);
            rc = fsa_cib_conn->cmds->signon(fsa_cib_conn, CRM_SYSTEM_CRMD, cib_command_nonblocking);
        }

        if (rc != pcmk_ok) {
            crm_info("Could not connect to the CIB manager: %s", pcmk_strerror(rc));

        } else if (pcmk_ok !=
                   fsa_cib_conn->cmds->set_connection_dnotify(fsa_cib_conn,
                                                              crmd_cib_connection_destroy)) {
            crm_err("Could not set dnotify callback");

        } else if (pcmk_ok !=
                   fsa_cib_conn->cmds->add_notify_callback(fsa_cib_conn, T_CIB_REPLACE_NOTIFY,
                                                           do_cib_replaced)) {
            crm_err("Could not set CIB notification callback (replace)");

        } else if (pcmk_ok !=
                   fsa_cib_conn->cmds->add_notify_callback(fsa_cib_conn, T_CIB_DIFF_NOTIFY,
                                                           do_cib_updated)) {
            crm_err("Could not set CIB notification callback (update)");

        } else {
            set_bit(fsa_input_register, R_CIB_CONNECTED);
            cib_retries = 0;
        }

        if (is_not_set(fsa_input_register, R_CIB_CONNECTED)) {

            cib_retries++;
            crm_warn("Couldn't complete CIB registration %d"
                     " times... pause and retry", cib_retries);

            if (cib_retries < 30) {
                controld_start_timer(wait_timer);
                crmd_fsa_stall(FALSE);

            } else {
                crm_err("Could not complete CIB"
                        " registration  %d times..." " hard error", cib_retries);
                register_fsa_error(C_FSA_INTERNAL, I_ERROR, NULL);
            }
        }
    }
}

/*!
 * \internal
 * \brief Get CIB call options to use local scope if master unavailable
 *
 * \return CIB call options
 */
int crmd_cib_smart_opt()
{
    int call_opt = cib_quorum_override;

    if (fsa_state == S_ELECTION || fsa_state == S_PENDING) {
        crm_info("Sending update to local CIB in state: %s", fsa_state2string(fsa_state));
        call_opt |= cib_scope_local;
    }
    return call_opt;
}

/*!
 * \internal
 * \brief Check whether an action type should be recorded in the CIB
 *
 * \param[in] action  Action type
 *
 * \return TRUE if action should be recorded, FALSE otherwise
 */
bool
controld_action_is_recordable(const char *action)
{
    if (safe_str_eq(action, CRMD_ACTION_CANCEL)
        || safe_str_eq(action, CRMD_ACTION_DELETE)
        || safe_str_eq(action, CRMD_ACTION_NOTIFY)
        || safe_str_eq(action, CRMD_ACTION_METADATA)) {
        return FALSE;
    }
    return TRUE;
}

static void
cib_delete_callback(xmlNode *msg, int call_id, int rc, xmlNode *output,
                    void *user_data)
{
    char *desc = user_data;

    if (rc == 0) {
        crm_debug("Deletion of %s (via CIB call %d) succeeded", desc, call_id);
    } else {
        crm_warn("Deletion of %s (via CIB call %d) failed: %s " CRM_XS " rc=%d",
                 desc, call_id, pcmk_strerror(rc), rc);
    }
}

// Searches for various portions of node_state to delete

// Match a particular node's node_state (takes node name 1x)
#define XPATH_NODE_STATE        "//" XML_CIB_TAG_STATE "[@" XML_ATTR_UNAME "='%s']"

// Node's lrm section (name 1x)
#define XPATH_NODE_LRM          XPATH_NODE_STATE "/" XML_CIB_TAG_LRM

// Node's transient_attributes section (name 1x)
#define XPATH_NODE_ATTRS        XPATH_NODE_STATE "/" XML_TAG_TRANSIENT_NODEATTRS

// Everything under node_state (name 1x)
#define XPATH_NODE_ALL          XPATH_NODE_STATE "/*"

/*!
 * \internal
 * \brief Delete subsection of a node's CIB node_state
 *
 * \param[in] uname    Desired node
 * \param[in] section  Subsection of node_state to delete
 * \param[in] options  CIB call options to use
 */
void
controld_delete_node_state(const char *uname, enum controld_section_e section,
                           int options)
{
    char *xpath = NULL;
    char *desc = NULL;

    CRM_CHECK(uname != NULL, return);
    switch (section) {
        case controld_section_lrm:
            xpath = crm_strdup_printf(XPATH_NODE_LRM, uname);
            desc = crm_strdup_printf("resource history for node %s", uname);
            break;
        case controld_section_attrs:
            xpath = crm_strdup_printf(XPATH_NODE_ATTRS, uname);
            desc = crm_strdup_printf("transient attributes for node %s", uname);
            break;
        case controld_section_all:
            xpath = crm_strdup_printf(XPATH_NODE_ALL, uname);
            desc = crm_strdup_printf("all state for node %s", uname);
            break;
    }

    if (fsa_cib_conn == NULL) {
        crm_warn("Unable to delete %s: no CIB connection", desc);
        free(desc);
    } else {
        int call_id;

        options |= cib_quorum_override|cib_xpath;
        call_id = fsa_cib_conn->cmds->remove(fsa_cib_conn, xpath, NULL, options);
        crm_info("Deleting %s (via CIB call %d) " CRM_XS " xpath=%s",
                 desc, call_id, xpath);
        fsa_register_cib_callback(call_id, FALSE, desc, cib_delete_callback);
        // CIB library handles freeing desc
    }
    free(xpath);
}