如何使用 node.js httpRequest 连接到 dashdb

Question

我们如何使用 node.js 的 HTTP/Request 模块连接到 Dash DB 并执行 R 脚本代码。我可以使用 Node-RED 来完成，但我喜欢以编程方式进行。现在我收到这个错误：

0530 [App/0] ERR Potentially unhandled rejection [2] Error: EACCES, mkdir '/home/nol' 
0530 [App/0] OUT STATUS: 500 
0530 [App/0] OUT HEADERS: {""content-type":"text/html; charset=UTF-8","set-cookie":Path=/; Secure; HttpOnly"],"connection":"Close", ""} 
0530 [App/0] OUT BODY: 
0530 [App/0] OUT An internal error has occurred. The application may still be initializing or the URL used is invalid. Check the URL and try again. For more information, view the server log files.

下面是我的代码：

  var options = {
  hostname: 'bluemix05.bluforcloud.com',
  host:'50.97.93.115',
  port: 8443,
  path: ':/console/blushiftservices/BluShiftHttp.do',
  method: 'POST',
  username: 'xxxxxxxxx',
  password: 'xxxxxxxxx',
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Authorization' : 'Basic ' + new Buffer(username + ':' + password).toString('base64')
  }
};
var postData = querystring.stringify({
  'msg' : 'cmd=RScriptRunScript&command=library\(ibmdbR\)\ncon <- idaConnect(\"BLUDB\",\"\",\"\")\nidaInit(con)\nSUB_NUM <- c\(0877777777\)\nPAST_YR_AVG <- c\(300\)\nTestUsageTable1<- data.frame \(SUB_NUM,PAST_YR_AVG,stringsAsFactors=FALSE\)\nsqlSave\(con, TestUsageTable1, rownames=FALSE,safer=FALSE,append=TRUE\)&profileName=BLUDB'
});
var req = http.request(options, function (res) {
                             console.log('STATUS: ' + res.statusCode);
                             console.log('HEADERS: ' + JSON.stringify(res.headers));
                             res.setEncoding('utf8');
                             res.on('data', function (chunk) {
                               console.log('BODY: ' + chunk);
                             });
                               loggererror.info('STATUS: ' + res.statusCode);
                           });

req.on('error', function(e) {
  console.log('problem with request: ' + e.message);
  loggererror.info('Status: ' + e.message);
});

req.write(postData);
req.end();

Answer 1

我修改了代码并使其更类似于 node-red http 代码（确保在测试代码之前更新您的用户名、密码和 url 以匹配您的 dashDB 实例）：

var https = require("follow-redirects").https;
var urllib = require("url");

var options = urllib.parse('https://awh-yp-small03.services.dal.bluemix.net:8443/console/blushiftservices/BluShiftHttp.do');
options.method = 'POST';
options.headers = {"content-type": "application/x-www-form-urlencoded"};
options.auth = '<username>:<password>';

var postData = 'cmd=RScriptRunScript&command=library\(ibmdbR\)\ncon <- idaConnect(\"BLUDB\",\"\",\"\")\nidaInit(con)\nSUB_NUM <- c\(0877777777\)\nPAST_YR_AVG <- c\(300\)\nTestUsageTable1<- data.frame \(SUB_NUM,PAST_YR_AVG,stringsAsFactors=FALSE\)\nsqlSave\(con, TestUsageTable1, rownames=FALSE,safer=FALSE,append=TRUE\)&profileName=BLUDB';

var req = https.request(options, function (res) {
                             console.log('STATUS: ' + res.statusCode);
                             console.log('HEADERS: ' + JSON.stringify(res.headers));
                             res.setEncoding('utf8');
                             res.on('data', function (chunk) {
                               console.log('BODY: ' + chunk);
                             });
                               //loggererror.info('STATUS: ' + res.statusCode);
                           });

req.on('error', function(e) {
  console.log('problem with request: ' + e.message);
  //loggererror.info('Status: ' + e.message);
});

req.write(postData);
req.end();

我的结果是这样的：

STATUS: 200
HEADERS: {"x-powered-by":"Servlet/3.0","content-type":"text/json; charset=UTF-8","content-language":"en-US","content-length":"857","set-cookie":["dsweb11082=0000Pv6OYa62mRxurvYa6c2_5of:31d3d6bb-82d3-44ca-8db8-ac929c09de05; Path=/; Secure; HttpOnly"],"connection":"Close","date":"Wed, 14 Oct 2015 22:11:27 GMT","server":"WebSphere Application Server","expires":"Thu, 01 Dec 1994 16:00:00 GMT","cache-control":"no-cache=\"set-cookie, set-cookie2\""}
BODY: 
{"message":"","cmd":"RScriptRunScript","errorMessageCode":"","items":"{\"RModelOutput\":\"\",\"filename\":[],\"workingDirectory\":\"\\/opt\\/ibm\\/dsserver\\/Config\\/RModels\\/Pv6OYa62mRxurvYa6c2_5of\\/1444860685812\",\"RModelError\":\"Loading required package: RODBC\nLoading required package: ibmdbR\nLoading required package: methods\nLoading required package: MASS\nLoading required package: grDevices\nLoading required package: graphics\nLoading required package: stats\nLoading required package: utils\nLoading required package: Matrix\nLoading required package:
BODY:  arules\n\nAttaching package: \u2018arules\u2019\n\nThe following objects are masked from \u2018package:base\u2019:\n\n    %in%, write\n\nLoading required package: rpart\nWarning message:\nclosing unused RODBC handle 1 \n\"}","resultcode":"success"}

如何使用 node.js httpRequest 连接到 dashdb

How to connect to dashdb with node.js httpRequest

node.js

node-request

node-red

dashdb

ibm-cloud