Question

您是否知道使用redis客户端多重事务命令与bluebird承诺的方法？

因为，以下代码永远不会完成。

  var $redis = require('redis'),
      $p = require('bluebird'),
      $r = $p.promisifyAll($redis.multi());

  $r.setAsync('key', 'test')
    .then(function(reply, data) {
      // ...
    });

  $r.exec(function() {
    $r.quit();
    process.exit();
  });

Answer 1

该命令不需要挂起的唯一事情就是在之前使用promisified连接获取多个。

var $redis = require('redis'),
    $p = require('bluebird'),
    $r;

// this is important for bluebird async operations!
$r = $p.promisifyAll($redis.createClient.apply(this, arguments));

// multi also need to be promisifed with the promisified conn above
$r = $p.promisifyAll($r.multi());

$r.setAsync('key', '0').then(function(data) { });
$r.incrAsync('key');

// all of the above commands pipelined above will be executed with this command
$r.execAsync().then(function() {
  $r.quit();

  // this will make the console app (or whatever app) quit
  process.exit();
});

Answer 2

有没有办法在这些块完成后运行exec？

嗯，只是把它链起来：

$r.pfaddAsync('key', item)
  .then(function(result) {
    // marked
    if (result === 0) {
      $r.incrAsync('dup');
    } else {
      $r.incrAsync('unq');
    }
    $r.exec();
  });

或者甚至

$r.pfaddAsync('key', item)
  .then(function(result) {
    // marked
    if (result === 0) {
      $r.incrAsync('dup');
    } else {
      $r.incrAsync('unq');
    }
  })
  .then($r.exec);

或者，如果您想在 incrAsync完成后执行它，那么它将是

$r.pfaddAsync('key', item) .then(function(result) { return $r.incrAsync(result === 0 ? 'dup' : 'unq'); // ^^^^^^ }) .then($r.exec);

_{当.then($r.exec)需要作为方法调用时，exec可能无效，请改用<{1}}}

Redis多与蓝鸟承诺

2 个答案: