REST API Tutorial 7: On Demand End of Day extraction

 

Last update Dec 2023
Environment Any
Language Any HTTP is supported
Compilers None
Prerequisites DSS login, internet access, REST API Tutorial 3
Source code Below

Tutorial purpose

Please follow the REST API tutorial 3, which explains the workflow, before going through this one.

This tutorial explains how to:

  • Retrieve the available field list from the server (optional).
  • Request EoD (End of Day) data from the server, using an on demand request.
  • Check the request status.
  • Retrieve the data.

 

Table of contents

 

Get available field list for EoD data - HTTP request

This step is optional. If you do not know what content field names are available, you can request a list of those available.

URL:

The available field set depends on the type of data you want to request. The data type must therefore be specified in the request, which is done by setting a report template type in the URL. As we want EoD data we set a value of ElektronTimeseries. The preceding and following tutorials show other possibilities.

    	
            https://selectapi.datascope.refinitiv.com/RestApi/v1/Extractions/GetValidContentFieldTypes(ReportTemplateType=DataScope.Select.Api.Extractions.ReportTemplates.ReportTemplateTypes'ElektronTimeseries')
        
        
    

Method:          GET

Headers:

Note: for all requests we need a user token, set in the header. The token was retrieved in Tutorial 1.

    	
            

Prefer: respond-async

Content-Type: application/json

Authorization: Token F0ABE9A3FFF2E02E10AE2765ED872C59B8CC3B40EBB61B30E295E71DE31C254B8648DB9434C2DF9299FDC668AA123501F322D99D45C8B93438063C912BC936C7B87062B0CF812138863F5D836A7B31A32DCA67EF07B3B50B2FC4978DF6F76784FDF35FCB523A8430DA93613BC5730CDC310D4D241718F9FC3F2E55465A24957CC287BDEC79046B31AD642606275AEAD76318CB221BD843348E1483670DA13968D8A242AAFCF9E13E23240C905AE46DED9EDCA9BB316B4C5C767B18DB2EA7ADD100817ADF059D01394BC6375BECAF6138C25DBA57577F0061

 

Get available field list for EoD data - HTTP response

If the token is valid, this is the response we get:

Status:                        200 OK

Relevant headers:

 

    	
            Content-Type: application/json; charset=utf-8
        
        
    

Body:

There are more than 100 values in the response. Here is the beginning of the response:

    	
            

{

  "@odata.context": "https://selectapi.datascope.refinitiv.com/RestApi/v1/$metadata#ContentFieldTypes",

  "value": [

    {

      "Code": "ETS.Advancing Issues",

      "Name": "Advancing Issues",

      "Description": "Number of issues which have advanced today",

      "FormatType": "Number",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Advancing Volume",

      "Name": "Advancing Volume",

      "Description": "Accumulated volume of issues that have advanced today",

      "FormatType": "Number",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Alternate Close",

      "Name": "Alternate Close",

      "Description": "Used to denote a secondary close price for a particular instrument",

      "FormatType": "Number",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Ask",

      "Name": "Ask",

      "Description": "Instrument's last ask price for the trading day",

      "FormatType": "Number",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Ask High",

      "Name": "Ask High",

      "Description": "Highest value of recorded ask orders.",

      "FormatType": "Number",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Ask Yield",

      "Name": "Ask Yield",

      "Description": "Current or Best Ask Yield or Secondary Active Yield field.",

      "FormatType": "Number",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Asset ID",

      "Name": "Asset ID",

      "Description": "Unique system-assigned identifier for the instrument",

      "FormatType": "Text",

      "FieldGroup": " "

    },

This goes on with all the other available fields. Here is the last part:

    	
            

    {

      "Code": "ETS.VWAP",

      "Name": "VWAP",

      "Description": "Volume Weighted Average Price",

      "FormatType": "Number",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Wertpapier",

      "Name": "Wertpapier",

      "Description": "Issue-level code used for identifying instruments in Germany",

      "FormatType": "Text",

      "FieldGroup": " "

    },

    {

      "Code": "ETS.Yield",

      "Name": "Yield",

      "Description": "For equities, this is the dividend per share expressed as a percentage of the price. For bonds, this is the current or simple yield i.e., the interest expressed as a percentage of the price",

      "FormatType": "Number",

      "FieldGroup": " "

    }

  ]

}

The result contains the field code, name, a description, field type (number, text, date) and group.

Choose the field names you want. In the next step we will make a request for EoD data, using these data fields.

 

Request EoD data - HTTP request

This is an On Demand extraction request.

URL:

    	
            https://selectapi.datascope.refinitiv.com/RestApi/v1/Extractions/ExtractRaw
        
        
    

Method:          POST

Headers:

The body of the request must mention it is an extraction request. It contains several parts:

  • The type of extraction: as we want tick data we set a value of ElektronTimeseriesExtractionRequest. The preceding and following tutorials show other possibilities.
  • The list of field names: these were determined in the previous step of this tutorial.
  • The list of instrument identifiers, each one with its type. Below we define one instrument using a RIC.
  • The conditions: they include the date range for the request.
    	
            

Prefer: respond-async

Content-Type: application/json

Authorization: Token F0ABE9A3FFF2E02E10AE2765ED872C59B8CC3B40EBB61B30E295E71DE31C254B8648DB9434C2DF9299FDC668AA123501F322D99D45C8B93438063C912BC936C7B87062B0CF812138863F5D836A7B31A32DCA67EF07B3B50B2FC4978DF6F76784FDF35FCB523A8430DA93613BC5730CDC310D4D241718F9FC3F2E55465A24957CC287BDEC79046B31AD642606275AEAD76318CB221BD843348E1483670DA13968D8A242AAFCF9E13E23240C905AE46DED9EDCA9BB316B4C5C767B18DB2EA7ADD100817ADF059D01394BC6375BECAF6138C25DBA57577F0061

Body:

    	
            

{

  "ExtractionRequest": {

    "@odata.type": "#DataScope.Select.Api.Extractions.ExtractionRequests.ElektronTimeseriesExtractionRequest",

    "ContentFieldNames": [

      "Instrument ID",

      "Open",

      "High",

      "Low",

      "Last",

      "Volume",

      "VWAP",

      "Number of Price Moves",

      "Trade Date"

    ],

    "IdentifierList": {

      "@odata.type": "#DataScope.Select.Api.Extractions.ExtractionRequests.InstrumentIdentifierList",

      "InstrumentIdentifiers": [

        { "Identifier": "CARR.PA", "IdentifierType": "Ric" }

      ]

    },

    "Condition": {

      "ReportDateRangeType": "Range",

      "QueryStartDate": "1996-01-01",

      "QueryEndDate": "2016-11-01"

    }

  }

}

 

Request EoD data - HTTP response

The possible responses are described in detail the REST API tutorial 3.

In a nutshell, the most likely outcome is a response with an HTTP status of 202 Accepted, and the header will contain a location URL. The next step is to check the request status by polling the location URL regularly until it returns a 200 OK.

If the request is for a small amount of data, the response could have an HTTP status of 200 OK, and the body will contain a jobId and Notes. If the Notes contain the message: Processing completed successfully, we can proceed further. We skip the step where we check the request status, and go directly to the last step, which is to retrieve the data using the jobId.

Other HTTP status codes can be encountered, follow this link for a full list with detailed explanations. It is strongly recommended that your code handle all possible status codes.

 

Check request status - HTTP request

Skip this step if the previous step returned an HTTP status of 200 OK.

If the previous step returned an HTTP status of 202 Accepted, this step must be executed, and repeated in a polling loop until it returns an HTTP status of 200 OK.

URL:

This is the location URL, taken from the 202 response header received in the previous step.

    	
            https://selectapi.datascope.refinitiv.com/RestApi/v1/Extractions/ExtractRawResult(ExtractionId='0x057dc14e379b2f86')
        
        
    

Method:          GET

Headers:

    	
            

Prefer: respond-async

Content-Type: application/json

Authorization: Token F0ABE9A3FFF2E02E10AE2765ED872C59B8CC3B40EBB61B30E295E71DE31C254B8648DB9434C2DF9299FDC668AA123501F322D99D45C8B93438063C912BC936C7B87062B0CF812138863F5D836A7B31A32DCA67EF07B3B50B2FC4978DF6F76784FDF35FCB523A8430DA93613BC5730CDC310D4D241718F9FC3F2E55465A24957CC287BDEC79046B31AD642606275AEAD76318CB221BD843348E1483670DA13968D8A242AAFCF9E13E23240C905AE46DED9EDCA9BB316B4C5C767B18DB2EA7ADD100817ADF059D01394BC6375BECAF6138C25DBA57577F0061

 

Check request status - HTTP response

If you receive an HTTP status 202 Accepted response (the same as in the previous step), it means the request has not yet completed. You must wait a bit and check the request status again.

If you receive an HTTP status 200 OK response, the body will contain a jobId and Notes. If the Notes contain the message: Processing completed successfully, we can proceed further. We go to the last step, which is to retrieve the data using the jobId.

 

 

Retrieve data - HTTP request

It is mandatory to have received a 200 OK response with a JobID from a previous step before proceeding with this last step.

URL:

Note the jobId, used as parameter in the URL.

    	
            https://selectapi.datascope.refinitiv.com/RestApi/v1/Extractions/RawExtractionResults('0x057dc14e379b2f86')/$value
        
        
    

Method:          GET

Headers:

    	
            

Prefer: respond-async

Content-Type: Accept-Encoding: gzip, deflate

Authorization: Token F0ABE9A3FFF2E02E10AE2765ED872C59B8CC3B40EBB61B30E295E71DE31C254B8648DB9434C2DF9299FDC668AA123501F322D99D45C8B93438063C912BC936C7B87062B0CF812138863F5D836A7B31A32DCA67EF07B3B50B2FC4978DF6F76784FDF35FCB523A8430DA93613BC5730CDC310D4D241718F9FC3F2E55465A24957CC287BDEC79046B31AD642606275AEAD76318CB221BD843348E1483670DA13968D8A242AAFCF9E13E23240C905AE46DED9EDCA9BB316B4C5C767B18DB2EA7ADD100817ADF059D01394BC6375BECAF6138C25DBA57577F0061

 

Retrieve data - HTTP response

We should get a response of this type:

Status:                        200 OK

Relevant headers:

    	
            

Content-Encoding: gzip

Content-Type: text/plain

Body:

Here is the beginning of the response content:

    	
            

Instrument ID,Open,High,Low,Last,Volume,VWAP,Number of Price Moves,Trade Date

CARR.PA,2986,3030,2986,3017,28277,,,1996/01/02

CARR.PA,3050,3087,3035,3076,47323,,,1996/01/03

CARR.PA,3069,3141,3065,3129,59817,,,1996/01/04

CARR.PA,3067,3110,3056,3086,63216,,,1996/01/05

CARR.PA,3099,3125,3090,3099,20808,,,1996/01/08

CARR.PA,3108,3119,3100,3109,30141,,,1996/01/09

CARR.PA,3091,3125,3091,3120,28216,,,1996/01/10

CARR.PA,3109,3140,3105,3129,15204,,,1996/01/11

CARR.PA,3136,3175,3136,3163,39944,,,1996/01/12

Here is the end of the response content:

    	
            

CARR.PA,23.08,23.185,23,23.055,1882751,23.087,4987,2016/10/17

CARR.PA,23.135,23.63,23.1,23.47,3746159,23.389,8886,2016/10/18

CARR.PA,24.1,24.84,23.665,24.57,7733197,24.317,20456,2016/10/19

CARR.PA,24.695,24.79,24.17,24.355,3693262,24.393,10185,2016/10/20

CARR.PA,24.425,24.475,24.165,24.315,2115738,24.298,6507,2016/10/21

CARR.PA,24.405,24.46,24.26,24.28,1791156,24.332,5205,2016/10/24

CARR.PA,24.35,24.435,24.04,24.28,2314436,24.246,7234,2016/10/25

CARR.PA,24.29,24.335,23.995,24.135,1940424,24.115,5894,2016/10/26

CARR.PA,24.085,24.245,23.96,24.155,1732727,24.12,6072,2016/10/27

CARR.PA,23.99,24.125,23.74,24.125,2226302,23.953,7221,2016/10/28

CARR.PA,24.025,24.065,23.805,23.895,1980502,23.887,4595,2016/10/31

CARR.PA,23.93,24.02,23.64,23.745,1899220,23.804,5585,2016/11/01