PHP Redis Cluster集群状态检测脚本

时鹏亮
11 months ago
请知悉：本文最近一次更新为 11个月前，文中内容可能已经过时。
嗯，Redis Cluster集群状态检测其实一般telnet上去直接一个CLUSTER INFO就可以了。
但如果你需要节点等细节工作状态，那么这里有个来自Github的 michael-grunder 现成脚本：
<?php
// php cluter-quick-check --host <host> --port <port> [--auth password]

function panicAbort($str_msg) {
    fprintf(STDERR, "Error: $str_msg\n");
    exit(-1);
}

function panicClusterSlotsError($arr_slots, $str_context) {
    $str_slots = print_r($arr_slots, true);
    printWarning($str_slots);
    panicError("Malformed CLUSTER SLOTS response ($str_context)");
}

function panicRedisError($str_msg, $arr_errors) {
    fprintf(STDERR, "Redis Error: $str_msg\n");
    foreach ($arr_errors as $str_error) {
        if ($str_error) {
            fprintf(STDERR, "  Context: $str_error\n");
        }
    }

    exit(-1);
}

function printWarning($str_msg) {
    fprintf(STDERR, "Warning: $str_msg\n");
}

function printWarningArray($str_header, $arr_lines) {
    fprintf(STDERR, "--- $str_header ---\n");
    foreach ($arr_lines as $str_line) {
        fprintf(STDERR, "$str_line\n");
    }
}

function printUsage() {
    fprintf(STDERR, "Usage:  php cluster-quick-check.php --host <host> --port <port> [ --auth <auth>]\n");
    exit(-1);
}

function getRedisConnection($str_host, $i_port, $str_auth) {
    static $_arr_redis = [];

    $str_hash = "$str_host:$i_port";
    if (!isset($_arr_redis[$str_hash])) {
        try {
            $obj_r = new Redis(); $obj_r->connect($str_host, $i_port);
            if ( ! $obj_r->isConnected()) {
                panicAbort("Cannot connect to Redis at $str_hash");
            }

            if ($str_auth) $obj_r->auth($str_auth);
            $arr_errors = [$obj_r->getLastError()];

            if ( ! $obj_r->ping()) {
                $arr_errors[] = $obj_r->getLastError();
                panicRedisError("Can't connect/ping Redis at $str_hash", $arr_errors);
            }

            $_arr_redis[$str_hash] = $obj_r;
        } catch(Exception $ex) {
            panicAbort("getRedisConnection(): Can't connect to '$str_hash' (" . $ex->getMessage() . ')');
        }
    }

    return $_arr_redis[$str_hash];
}

function checkClusterState($obj_r) {
    $arr_info = array_filter(explode("\r\n", $obj_r->rawCommand('CLUSTER', 'INFO')));
    foreach ($arr_info as $str_line) {
        $arr_bits = explode(':', $str_line);
        if (count($arr_bits) != 2) {
            printWarning("Malformed CLUSTER INFO line: $str_line");
            continue;
        }

        list ($key, $value) = $arr_bits;
        if ($key == 'cluster_state') {
            if ($value != 'ok') {
                printWarningArray("CLUSTER INFO", $arr_info);
                panicAbort("Cluster is not properly up!");
            }

            /* Redis thinks it's up */
            return;
        }
    }

    /* We shouldn't really get here but make sure anyway */
    printWarningArray("CLUSTER INFO", $arr_info);
    panicAbort("Cluster is not properly up!");
}

function checkClusterSlots($obj_r) {
    $arr_slots = $obj_r->rawCommand('CLUSTER', 'SLOTS');

    foreach ($arr_slots as $arr_slot) {
        if (count($arr_slot) < 3) {
            panicClusterSlotsError($arr_slots, 'node');
        }

        $sslot = array_shift($arr_slot);
        $eslot = array_shift($arr_slot);

        foreach ($arr_slot as $arr_info) {
            if (count($arr_info) != 3) {
                panicClusterSlotsError($arr_slots, 'info');
            }

            list($str_host, $i_port) = $arr_info;
            echo "Checking [$sslot:$eslot] ($str_host:$i_port): ";
            getRedisConnection($str_host, $i_port, $obj_r->getAuth());
            echo "OK\n";
        }
    }
}

function getMovedNode($obj_r, $str_msg, &$str_host, &$i_port) {
    $arr_bits = explode(' ', $str_msg);

    if ($arr_bits[0] == 'MOVED' || $arr_bits[0] == 'ASKING') {
        if (count($arr_bits) != 3) {
            panicAbort("Malformed redirection!");
        }

        $arr_dest = explode(':', $arr_bits[2]);
        if (count($arr_dest) != 2) {
            panicAbort("Malformed destination node!");
        }

        list($str_host, $i_port) = $arr_dest;
        $i_port = str_replace("\0", '', $i_port);
        return true;
    }

    return false;
}

function sendClusterCommand($obj_r, $str_cmd, $arr_args) {
    $tries = 10;

    while($tries--) {
        try {
            call_user_func_array([$obj_r, $str_cmd], $arr_args);

            if (($str_error = $obj_r->getLastError())) {
                if (getMovedNode($obj_r, $str_error, $str_host, $i_port)) {
                    echo "Redirected to '$str_host:$i_port'\n";
                    $obj_r = getRedisConnection($str_host, $i_port, $obj_r->getAuth());
                } else {
                    panicRedisError("Non MOVED error", [$str_error]);
                }
            }

            return $obj_r;
        } catch(Exception $ex) {
            $str_msg = $ex->getMessage();
            if (getMovedNode($obj_r, $str_msg, $str_host, $i_port)) {
                echo "Redirected to '$str_host:$i_port'\n";
                $obj_r = getRedisConnection($str_host, $i_port, $obj_r->getAuth());
            } else {
                panicAbort("Non MOVED Redis exception: " . $ex->getMessage());
            }
        }
    }

    panicAbort("Too many tries tring to find destination node!");
}

$arr_opt = getopt('', ['host:', 'port:', 'auth:']);
$str_host = $arr_opt['host'] ?? NULL;
$i_port = $arr_opt['port'] ?? NULL;
$str_auth = $arr_opt['auth'] ?? NULL;

if (!$str_host || !$i_port) {
    printUsage();
}

/* Attempt to connect to the seed */
$obj_r = getRedisConnection($str_host, $i_port, $str_auth);

/* Step one, see if Redis thinks it's a cluster and if the cluster is OK */
echo "Checking general cluster INFO: ";
checkClusterState($obj_r);
echo "OK\n";

/* OK this seems good, now let's iterate over cluster slots */
checkClusterSlots($obj_r);

/* Finally let's set some data */
for($i = 0; $i < 10; $i++) {
    $str_key = "phpredis-cluster-key:$i";
    $str_val = "phpredis-cluster-val:$i";

    echo "Attempting to set key '$str_key'\n";
    $obj_r = sendClusterCommand($obj_r, 'SET', [$str_key, $str_val]);
    echo "Success setting '$str_key'\n";
}

echo "Cluster seems OK\n";

?>
PHP Redis Cluster集群状态检测脚本

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