How to successfully create a contract using python request lib?

Questions
,
1

Hello Damler’s
my snadbox is runing against my ledger id
my json api is also runing
but when ever I run a python script to create a contract, the token was specified by authentication using JWT same ledger id used to start sandbox.
under ui/package.json i have added "proxy": "http://localhost:7575"
I am getting the following error:

HTTP service responded: <Response [404]>
{'errors': ['HttpMethod(POST), uri: http://localhost:7575/command/create'], 'status': 404}

Please advise
Thanks,

1 Like
2

Hi @KsarCapital, welcome to the forum!

The endpoint for creating new contracts is /v1/create not /command/create which seems to be what your code is using. You can find this and more information in the docs.

Let us know if changing that fixes your issue!

2 Likes
3

Welcome to the forum @KsarCapital!

2 Likes
4

I have got a different error:
Cause: spray.json.DeserializationException: Expected JsString([:]:), got: {“entityName”:“Transfer”,“moduleName”:“Main”}’], ‘status’: 400}

Many thanks for the pointer @cocreature,

5

Hi @KsarCapital, if you look at the linked docs for the /v1/create request, you can see an example of the format for the request body

 {
  "templateId": "Iou:Iou",
  "payload": {
    "issuer": "Alice",
    "owner": "Alice",
    "currency": "USD",
    "amount": "999.99",
    "observers": []
  }
}

There is no entityName and moduleName field. Instead there is a single templateId field with (optional package id, ) module and entity name separated by colons. Are you maybe working based on some old documentation that uses a different format?

6

sdk-version: 1.3.0
daml 1.2

7

Here is my request:

return requests.post(

f"{endpoint}/v1/create",


headers = tokenHeader,

json = {



  "templateId" : {

    "moduleName": "Main",

    "entityName": contractName

  },

  "meta" : {

    "ledgerEffectiveTime": epoch # Wall time unsupported on DABL

  },

  "argument": {

    "event": damlDict,

    "owner": singatoryParty,

    "obs": singatoryParty

  }

},

verify=False

)

8

If you compare the JSON response body in your code to the one in the docs, there are 3 differences:

  1. templateId should be a single string with module name and entity name separate by :.
  2. You don’t need to set anything in meta.
  3. argument is called payload.

If you change those things in your example, you get

{
  "templateId" : "Main:{}".format(contractName),
  "payload": {
    "event": damlDict,
    "owner": singatoryParty,
    "obs": singatoryParty

  }
}

which should hopefully do the trick.

Could you share where you got the format in your code from? This used to be the syntax a few months ago (way before SDK 1.0.0) but there might still be some documentation that we need to update.