我在浏览器上玩elasticsearch.js。我想要ping elasticsearch,等待请求完成,然后返回连接的结果。但是现在它是异步发生的,即使连接正常,也会返回undefined。我有这样的代码:
var connectionOK = false;
function createElasticsearchClient(hostAddress) {
var client = new $.es.Client({
hosts: hostAddress
});
return client;
}
function checkElasticsearchConnection(client) {
$.when(pingElasticsearch(client)).done(function () {
return connectionOK;
});
}
function pingElasticsearch(client) {
console.log("ELASTICSEARCH: Trying to ping es");
client.ping({
requestTimeout: 30000,
// undocumented params are appended to the query string
hello: "elasticsearch"
}, function (error) {
if (error) {
console.error('ELASTICSEARCH: Cluster is down!');
connectionOK = false;
console.log("INSIDE: " + connectionOK);
} else {
console.log('ELASTICSEARCH: OK');
connectionOK = true;
console.log("INSIDE: " + connectionOK);
}
});
}以及如何使用:
var esClient = createElasticsearchClient("exampleserver.com:9200");
var esCanConnect = (checkElasticsearchConnection(esClient));发布于 2016-10-10 13:55:26
异步函数和同步函数混合在一起。您可以使用这种方法来代替:
function createElasticsearchClient(hostAddress, callback) {
var client = new $.es.Client({
hosts: hostAddress
});
return callback(client);
}
function pingElasticsearch(client, callback) {
console.log("ELASTICSEARCH: Trying to ping es");
client.ping({
requestTimeout: 30000,
// undocumented params are appended to the query string
hello: "elasticsearch"
}, function (error) {
if (error) {
return callback('ELASTICSEARCH: Cluster is down!');
} else {
return callback(null);
}
});
}然后跑
createElasticsearchClient("exampleserver.com:9200", function(esClient) {
pingElasticsearch(esClient, function(err) {
if (err) console.log(err);
else {
//Everything is ok
console.log('All good');
}
});
});https://stackoverflow.com/questions/39959855
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