Connection URL and Connection String

When opening a VDS its possible to use a URL and a connection string. The purpose of this is to create a unified connection API that can be used for multiple IO backends.

The URL consist protocol://resource/sub_path. The protocol will define the backend to be used. Currently this can be:

  • s3

  • azure

  • gs

  • sd

  • azureSAS

  • file

If the file protocol scheme is used the rest of the path will be decoded according to url encoding, however if OpenVDS fails to recognise the protocol of a url it will treat the url as a local file.

For s3 and gs the resource will be the bucket while for azure the resource will be the container. azureSAS will treat resource/sub_path as the baseURL of the SAS url and prepend https.

The connection string will provide protocol or backend specific data for the connection to the VDS. The string is a key/value string where the key and value is separated with a =. Each key/value pair is separated with a ;. It is allowed for the value to contain extra =, but the key can not. Having duplicate keys is NOT allowed, and will cause an error.

There are some globally recognized keys for the connection string. They are:

  • WaveletAdaptiveTolerance

  • WaveletAdaptiveRatio

WaveletAdaptiveTolerance and WaveletAdaptiveRatio are mutually exclusive.

The recognised keys for s3 connection string are

  • Region

  • EndpointOverride

  • AccessKeyId or AwsAccessKeyId

  • SecretKey, SecretAccessKey, AwsSecretKey or AwsSecretAccessKey

  • SessionToken

  • Expiration (Note: AWS SDK only accepts ‘Z’ timezone for ISO 8601 time)

  • LogFilenamePrefix

  • LogLevel (Note: this is to control the AWS specific logs. Possible values: Off, Fatal, Error, Warn, Info, Debug, Trace)

  • ConnectionTimoutMs

  • RequestTimeoutMs

  • DisableInitApi (This will disable init/deinit of AWS sdk. Possible values: 1, On, True, Yes (case insensitive), all other values are false.)

Note: Key values for S3 can be specified in CamelCase or snake_case

azure has two modes. The connection string mode or the bearer token mode. If the connection string contains a key with name BearerToken it will parse the string and extract following parameters:

  • AccountName

  • BearerToken

Both parameters are mandatory.

In the connection string mode the connection string is parsed according to the rules described here:

gs will accept the following keys

  • Token

  • CredentialsFile

  • JsonCredentials

  • SignedUrl (Possible values: True, Yes, On, False, No, Off. Default value: False, No, Off)

The Token is the OAuth2 token.

sd will accept the following keys

  • SdAuthorityUrl

  • SdApiKey

  • SdToken

  • LogLevel

  • AlreadyRegistered

  • LegalTag

The AlreadyRegistered option is a way to force OpenVDS to overwrite an existing dataset. It only works with the new DmsIOManager and not the depreacted sdapi based backend.

The token SdToken is typically a short lived token. The sd IO backend also supports using a RefreshToken flow. Then its not needed to specify the sdtoken but following key/value pairs have to specified:

  • AuthTokenUrl

  • ClientId

  • ClientSecret (Optional)

  • RefreshToken

  • Scopes (Optional)

When these paramaters are provided OpenVDS will send a “x-www-form-urlencoded” http request to AuthTokenUrl with supplied values and also added: grant_type=refresh_token&scope=openid email. scope can be overrided with the Scopes connectionString parameter. The ClientSecret is optional, as it is not needed when using, by eg, OAuth2 + PKCE. The used refresh token will be updated If the response contains a refresh_token member. It is the access_token member of the return that will be used as the sdtoken until it expires.

NOTE: Key values for sd can use snake_case instead of CammelCase to match the look and feel of the response from the token provider.

If the seismic dms service is targeting AWS, please make sure to set the AWS_REGION environment variable to the correct region.

azureSAS will accept the following keys

  • Suffix

The suffix is the SAS token.

Some examples:


url = "s3://my_bucket/somepath"
connection = "Region=eu-north-1"
#note that if Region is empty then the backend will try and find the region, but this only works if the credentials are the bucket owner


url = "azure://my_container/somepath"
connection = "DefaultEndpointsProtocol=https;AccountName=developer;AccountKey=somekey;"


url = "gs://my_bucket/somepath"
connection = "Token=some_token"


url = "sd://tenent/subprojet/subfolder"
connection = "sdauthorityurl=;sdapikey=ABC;sdtoken=some_token"


url = "azureSAS://"
connection = "Suffix=?sv=2019-10-10&ss=bfqt&srt=sco&sp=rwdlacupx&se=2020-06-11T18:26:15Z&st=2020-06-11T10:26:15Z&spr=https&sig=V5glday54BztU8qtiIlRjEOnboiy4Y%2Fu%2FhbqRqWSN2E%3D"