PHP和UniApp实现数据的分布式存储与备份的技巧

<?php
// 数据分片
function shard($key, $total_nodes) {
    $hash = crc32($key);
    $index = $hash % $total_nodes;
    return $index;
}

// 负载均衡
function load_balance($nodes) {
    $count = count($nodes);
    $index = mt_rand(0, $count - 1);
    return $nodes[$index];
}

// 数据复制
function replicate($data, $nodes) {
    $replicas = [];
    foreach ($nodes as $node) {
        $replicas[$node] = $data;
    }
    return $replicas;
}

// 数据存储
function store($key, $data, $nodes, $replica_count) {
    $shard_index = shard($key, count($nodes));
    $primary_node = $nodes[$shard_index];
    $replica_nodes = array_diff($nodes, [$primary_node]);
    
    $primary_data = [$primary_node => $data];
    $replica_data = replicate($data, array_rand($replica_nodes, $replica_count));
    
    $stored_data = array_merge($primary_data, $replica_data);
    
    foreach ($stored_data as $node => $data) {
        // 存储数据到各个节点
        // ...
        echo "数据[{$data}]存储到节点[{$node}]成功！
";
    }
}

// 示例用法
$key = 'user_001';
$data = '用户数据';
$nodes = ['node_001', 'node_002', 'node_003'];
$replica_count = 2;

store($key, $data, $nodes, $replica_count);
?>

// 数据存储
function store(key, data, nodes, replicaCount) {
    let shardIndex = crc32(key) % nodes.length;
    let primaryNode = nodes[shardIndex];
    let replicaNodes = nodes.filter(node => node !== primaryNode);
    
    let primaryData = { [primaryNode]: data };
    let replicaData = replicate(data, replicaNodes, replicaCount);
    
    let storedData = Object.assign({}, primaryData, replicaData);
    
    for (let node in storedData) {
        // 存储数据到各个节点
        // ...
        console.log(`数据[${storedData[node]}]存储到节点[${node}]成功！`);
    }
}

// 数据复制
function replicate(data, nodes, replicaCount) {
    let replicas = {};
    let randomIndexes = randomSample(nodes.length, replicaCount);
    
    randomIndexes.forEach(index => {
        replicas[nodes[index]] = data;
    });
    
    return replicas;
}

// 获取随机采样的索引
function randomSample(length, count) {
    let indexes = new Set();
    
    while (indexes.size < count) {
        indexes.add(Math.floor(Math.random() * length));
    }
    
    return Array.from(indexes);
}

// 示例用法
let key = 'user_001';
let data = '用户数据';
let nodes = ['node_001', 'node_002', 'node_003'];
let replicaCount = 2;

store(key, data, nodes, replicaCount);