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Intro to Params

Param Authorizations ​

Parameters​

Adding new Parameters​

Visit this page for implementation details on how to add new parameters.

MsgUpdateParams vs MsgUpdateParam​

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This is a critical distinction that can impact all onchain parameters.

When submitting changes using MsgUpdateParams (note the s), you must specify all parameters in the module even if just modifying one.

MsgUpdateParamsMsgUpdateParam
Cosmos SDK✅ (All params)❌ (Not available)
Pocket✅ (All params)✅ (Single param)

Summary of Key Differences:

  • Cosmos SDK uses MsgUpdateParams (with s) which requires specifying all parameters in the module, even when modifying just one
  • This repo implemented MsgUpdateParam (no s) allowing updates to one parameter at a time
  • More details on the Cosmos SDK MsgUpdateParams can be found here.
  • More details on poktroll's MsgUpdateParam can be found here.

This distinction is critical when making on-chain parameter changes in either system.

Examples​

Example: Changing Num Suppliers Per Session​

To query the number of suppliers per session, use the following command:

pocketd query session params --node https://shannon-grove-rpc.mainnet.poktroll.com

To update the number of suppliers per session, you needs to create a new file with the transaction like so:

cat << 🚀 > /tmp/update_suppliers_per_session
{
  "body": {
    "messages": [
      {
        "@type": "/pocket.session.MsgUpdateParam",
        "authority": "pokt18808wvw0h4t450t06uvauny8lvscsxjfyua7vh",
        "name": "num_suppliers_per_session",
        "as_uint64": "15"
      }
    ]
  }
}
🚀

Followed by running:

pocketd tx authz exec /tmp/update_suppliers_per_session --from grove_mainnet_genesis --yes

Example: Block Size Change​

For example, here's a transaction that will increase the block size (a parameter in the consensus module):

note

For convenience, we have put it in tools/scripts/params/consensus_block_size_6mb.json.

{
  "body": {
    "messages": [
      {
        "@type": "/cosmos.consensus.v1.MsgUpdateParams",
        "authority": "pokt18808wvw0h4t450t06uvauny8lvscsxjfyua7vh",
        "abci": {},
        "block": {
          "max_bytes": "66060288",
          "max_gas": "-1"
        },
        "evidence": {
          "max_age_duration": "48h0m0s",
          "max_age_num_blocks": "100000",
          "max_bytes": "1048576"
        },
        "validator": {
          "pub_key_types": ["ed25519"]
        }
      }
    ]
  }
}

To check the current consensus parameters (before and after the change), use this command:

pocketd query consensus params

Before the upgrade:

params:
  block:
    max_bytes: "22020096"
  # ... the rest of the response

To submit the transaction that increases the block size:

pocketd tx authz exec tools/scripts/params/consensus_block_size_6mb.json --from pnf --yes

After the upgrade:

params:
  block:
    max_bytes: "66060288"
  # ... the rest of the response