如何使用node.js連接到dashdb httpRequest

Question

如何使用node.js的HTTP/Request模塊連接到Dash DB並執行R-script代碼。我能夠使用Node-RED做到這一點，但喜歡以編程方式進行。現在我收到此錯誤：

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. 

下面是我的代碼：

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

我修改了代碼，並使其更類似於節點紅色HTTP代碼（請確保您更新您的用戶名，密碼和網址，以測試代碼之前你dashDB實例匹配）：

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(); 

我的結果是這樣的：

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"}