Local DA implements the da interface over a Local Data Availability service.

It is intended to be used for testing DA layers without having to set up the actual services.

To build and run the local-da binary:

just build
./build/local-da

This will start the Local DA service with default settings, listening on localhost:7980 and with a default maximum blob size.

The output should look similar to this (the timestamp and maxBlobSize might vary):

11:07AM INF NewLocalDA: initialized LocalDA module=local-da
11:07AM INF Listening on host=localhost maxBlobSize=1974272 module=da port=7980
11:07AM INF server started listening on=localhost:7980 module=da

Which exposes the da interface over JSONRPC and can be accessed with an HTTP client like xh:

You can customize the behavior of the local-da binary using the following flags:

• -port <port>: Specifies the listening port. Default: 7980.
• -host <host>: Specifies the listening address. Default: localhost.
• -listen-all: If set, the service listens on all network interfaces (0.0.0.0) instead of just localhost. This allows access from other machines.
• -max-blob-size <bytes>: Sets the maximum blob size in bytes that the DA service will accept. Default: 1974272 (which is 64 * 64 * 482).

Example with flags:

To run local-da on port 8000, accessible from any IP, with a max blob size of 1000000 bytes:

./build/local-da -port 8000 -listen-all -max-blob-size 1000000

Output:

11:07AM INF NewLocalDA: initialized LocalDA module=local-da
11:07AM INF Listening on host=0.0.0.0 maxBlobSize=1974272 module=da port=8000
11:07AM INF server started listening on=0.0.0.0:8000 module=da

xh http://127.0.0.1:7980 id=1 method=da.MaxBlobSize | jq

output:

{
  "jsonrpc": "2.0",
  "result": 1974272,
  "id": "1"
}

xh http://127.0.0.1:7980 id=1 method=da.Submit 'params[][]=SGVsbG8gd28ybGQh' 'params[]:=-2'  'params[]=AAAAAAAAAAAAAAAAAAAAAAAAAAECAwQFBgcICRA=' | jq

output:

{
    "jsonrpc": "2.0",
    "result": [
        "AQAAAAAAAADfgz5/IP20UeF81iRRzDBu/qC8eXr9DUyplrfXod3VOA=="
    ],
    "id": "1"
}

xh http://127.0.0.1:7980 id=1 method=da.Get 'params[][]=AQAAAAAAAADfgz5/IP20UeF81iRRzDBu/qC8eXr9DUyplrfXod3VOA==' 'params[]=AAAAAAAAAAAAAAAAAAAAAAAAAAECAwQFBgcICRA='

output:

{
    "jsonrpc": "2.0",
    "result": [
        "SGVsbG8gd28ybGQh"
    ],
    "id": "1"
}

[1] [da][ da]

[2] xh