[indexer] Get ready for nearcore 1.21.0

[khorolets]

nearcore is planned to be updated to version 1.21.0:

• testnet on Mon 16 Aug, 2021 UPD: Aug 18, 2021
• mainnet on Mon 23 Aug, 2021 UPD: Sep 6, 2021

Protocol upgrade is expected in this release (it means that your old indexers will work for ~2 days after release on testnet and ~7 days after release on mainnet)

Quick info

Commit hash 4c4f18b581b7a652388c8a9c650e203726aabf7d
Expected issues none
Reference have a look at how we made it on NEAR Indexer for Explorer + near/near-indexer-for-explorer#151

Heads up

Introduction of strictly typedAccountId (#4440)

For your information nearcore 1.21.0 includes breaking change in primitive type AccountId. It used to be an alias to String but now it is a separate type.

If your data handlers contain any logic around accounts (receiver_id, signer_id, etc.) you'll need to update the logic.

For example, if you were watching for Receipts and check if the receiver_id corresponds to the name of the contract you're watching you might have had something like:

if &receipt.receiver_id == "mycoolcontract.near" {
...
}

Now &receipt.receiver_id has the type &near_indexer::near_primitives::types::AccountId. You may want to change your code as following:

if receipt.receiver_id.as_ref() == "mycoolcontract.near" {
...
}

OR

if receipt.receiver_id == near_indexer::near_primitives::types::AccountId::from_str("mycoolcontract.near").expect("account id is invalid") {
...
}

Please note the examples are synthetic.

Names and number of arguments of init_config has changes in nearcore (#4427 and #4453)

• download argument has been replaced with download_config and download_genesis
• boot_nodes argument was added
• download_config_url was added

Feel free to leave your questions in the comments below.

[bowenwang1996]

FYI the release is delayed

[khorolets]

FYI I've added a new commit hash and additional PR for reference.

[khorolets]

Heads up, release dates were updated