如何使用node.js连接到dashdb httpRequest

Question

如何使用node.js的HTTP/Request模块连接到Dash DB并执行R-script代码。我能够使用Node-RED做到这一点，但喜欢以编程方式进行。现在我收到此错误：

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，并使其更类似于节点红色HTTP代码（请确保您更新您的用户名，密码和网址，以测试代码之前你dashDB实例匹配）：

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"}