[英]bind services in cloud foundry not working
我已經從市場創建了postgress服務(通過cf create-service),我想在我的node.js應用中使用它(我能夠在本地測試它的工作原理)兩個問題
1.我嘗試了以下操作,但應用程序無法啟動,在日志中,我將此作為環境變量的值,在這里我缺少什么?
這是代碼:
OK i've tried the following and the application doesnt able to start and in the log I got
這是我對環境變量的價值,我在這里缺少什么?
OUT env variable host: 10.0.97.139
OUT port: 34807
OUT user: qmxgvfybloierztm
OUT password: mlofvwfsxmf7bqjr
OUT database: r8n13yjyql7hwrgc
OUT url: postgres://qmxgvfybloierztm:mlofvwfsxmf7bqjr@10.0.97.135:34607/r8n13yjyql7hwrgc
OUT start create table
OUT ERROR: connect: Error: connect ECONNREFUSED 10.0.97.135:5432
(function(){
if (null == process.env.VCAP_SERVICES) {
var url = 'postgress://localhost:27017/local';
}
else {
var vcap_services = JSON.parse(process.env.VCAP_SERVICES);
console.log("postgress URL: ", url);
};
var DBWrapper = require('node-dbi').DBWrapper;
var dbConnectionConfig = {
uri: vcap_services['postgresql'][0].credentials.uri,
host: vcap_services['postgresql'][0].credentials.hostname,
port: vcap_services['postgresql'][0].credentials.port,
database: vcap_services['postgresql'][0].credentials.dbname,
user: vcap_services['postgresql'][0].credentials.username,
password: vcap_services['postgresql'][0].credentials.password
};
var dbWrapper = new DBWrapper('pg', dbConnectionConfig);
dbWrapper.connect();
console.log("start create table");
dbWrapper.query("CREATE TABLE IF NOT EXISTS TAB1 ( firstname TEXT primary key, lastname varchar(20) )", function (err, results) {
if (err) {
console.log("error while inserting data " + err);
} else {
console.log("success to insert data: ");
}
});
})();
更新(在Jerome回答之后...)這就是我的全部代碼!!!
"use strict";
var express = require("express");
var path = require("path");
var app = express();
var port = process.env.PORT || 3000;
app.listen(port, function () {
(function () {
var DBWrapper = require('node-dbi').DBWrapper;
var vcap_services = JSON.loparse(process.env.VCAP_SERVICES);
var pgconf = vcap_services['postgresql'][0].credentials;
var dbConnectionConfig = {
dsn: pgconf.uri
};
var dbWrapper = new DBWrapper('pg', dbConnectionConfig);
dbWrapper.connect();
console.log("env variable host: " + pgconf.hostname)
console.log("port: " + pgconf.port);
console.log("user: " + pgconf.user);
console.log("password: " + pgconf.password);
console.log("database: " + pgconf.database);
console.log("url: " + pgconf.uri);
console.log("start create table");
dbWrapper.query("CREATE TABLE IF NOT EXISTS USER ( firstname TEXT primary key, lastname varchar(20) )", function (err, results) {
if (err) {
console.log("error while inserting data " + err);
} else {
console.log("success to insert data: ");
}
});
var data =
{
firstname: 'John5',
lastname: 'Foo4444'
};
//insert data
dbWrapper.insert('USER', data, function (err, data) {
if (err) {
console.log("error to insert data: " + err);
// John has been inserted in our table, with its properties safely escaped
} else {
console.log("test" + data);
}
});
//read data
dbWrapper.fetchAll("SELECT * FROM USER", null, function (err, result) {
if (!err) {
console.log("Data came back from the DB.", result);
} else {
console.log("DB returned an error: %s", err);
}
dbWrapper.close(function (close_err) {
if (close_err) {
console.log("Error while disconnecting: %s", close_err);
}
});
});
})();
});
現在我得到這個錯誤
2016-07-26T11:55:49.69+0300 [App/0] OUT env variable host: undefined
2016-07-26T11:55:49.69+0300 [App/0] OUT port: 35058
2016-07-26T11:55:49.69+0300 [App/0] OUT user: undefined
2016-07-26T11:55:49.69+0300 [App/0] OUT password: hvevfgpjjtyqpr1d
2016-07-26T11:55:49.69+0300 [App/0] OUT database: undefined
2016-07-26T11:55:49.69+0300 [App/0] OUT url: postgres://fakttklwkxtfprgv:hvevfgpjjtyqpr1d@10.0.97.140:35058/ispkmc5psgdrwj4e
2016-07-26T11:55:49.69+0300 [App/0] OUT start create table
2016-07-26T11:55:49.69+0300 [App/0] OUT ERROR: connect: Error: getaddrinfo ENOTFOUND undefined undefined:5432
var cfg = this._connectionParams;
if (connectionParams["dsn"]) {
this._pgUrl = connectionParams["dsn"];
} else {
this._pgUrl = 'pg://'+cfg.user+':'+cfg.password+'@'+cfg.host+'/'+cfg.database;
}
this._dbClient = new pg.Client(this._pgUrl);
看到您的錯誤消息,
ERROR: connect: Error: connect ECONNREFUSED 10.0.97.135:5432
您的代碼正在嘗試連接到默認的postgres端口5432,這暗示着該端口未正確轉發到pg的事實。 node-dbi源代碼未使用cfg.port變量,因此可以解釋您的錯誤,因為如果我們相信顯示的“ url” ENV變量,則永遠不會給pg庫提供您的postgres實例正在監聽的34607端口在您的帖子中。
還要注意,node-dbi在存在dsn時更喜歡它:
this._pgUrl = connectionParams["dsn"];
您似乎在ENV中具有dsn,名稱為“ url”。
很難從外部為您提供確切的解決方法,但我認為它應該與
var DBWrapper = require('node-dbi').DBWrapper;
var pgconf = vcap_services['postgresql'][0].credentials;
var dbConnectionConfig = {
dsn: pgconf.url
};
var dbWrapper = new DBWrapper('pg', dbConnectionConfig);
dbWrapper.connect();
更新資料
給定的解決方案導致錯誤
OUT ERROR: connect: Error: getaddrinfo ENOTFOUND undefined undefined:5432
這往往表明dsn沒有給出或pg
沒有正確分析。 這使我看到node-dbi
使用了非常老的pg
版本。 因此,我們不應該嘗試將連接參數用作字符串。
您是否確認所使用的node-dbi
版本為0.7.1?
我剛剛安裝了node-dbi
。 它給了我0.7.1,在那里我可以閱讀
var cfg = this._connectionParams;
this._pgUrl = 'pg://' + cfg.user + ':' + cfg.password + '@' + cfg.host + '/' + cfg.database;
this._dbClient = new pg.Client(this._pgUrl);
因此此代碼與我們在github上看到的代碼不匹配。 在此版本中不處理dsn。
可以通過https://github.com/DrBenton/Node-DBI/commits/master確認。 0.7.1版本的日期為2014年1月,而postgres dsn處理的日期為2015年1月,因此尚未發布...
您的日志中存在差異,我不明白為什么它指出主機未定義,因此由於uri似乎正確,因此我將直接使用uri繞過它。
查看node-dbi
如何構建pg連接字符串,您可以嘗試
var url = require('url');
var DBWrapper = require('node-dbi').DBWrapper;
var pgconf = vcap_services['postgresql'][0].credentials;
console.log(pgconf.uri);
var parts = url.parse(pgconf.uri);
var dbConnectionConfig = {
user: parts.auth.split(':')[0],
password: parts.auth.split(':')[1],
host: parts.host,
database: parts.pathname.substr(1)
};
var dbWrapper = new DBWrapper('pg', dbConnectionConfig);
dbWrapper.connect();
一旦開始工作,就該考慮為什么node-dbi
看起來如此“脆弱”了,如果不想直接使用pg
那么可以使用另一個數據庫包裝程序,例如sequelize
。
然后應該與
var sequelize = new Sequelize(pgconf.uri, {})
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