Yellowstone Dragon's Mouth - a Geyser based gRPC interface for Solana

This repo contains a fully functional gRPC interface for Solana. It is built around Solana's Geyser interface. In this repo we have the plugin as well as sample clients for multiple languages.

It provides the ability to get slots, blocks, transactions, and account update notifications over a standardised path.

For additional documentation, please see: https://docs.triton.one/rpc-pool/grpc-subscriptions

Known bugs

Block reconstruction inside gRPC plugin based on information provided by BlockMeta, unfortunately number of entries for blocks generated on validators always equal to zero. These blocks always will have zero entries. See issue on GitHub: solana-labs/solana#33823

Validator

$ solana-validator --geyser-plugin-config yellowstone-grpc-geyser/config.json

Plugin config check

cargo-fmt && cargo run --bin config-check -- --config yellowstone-grpc-geyser/config.json

Block reconstruction

Geyser interface on block update do not provide detailed information about transactions and accounts updates. To provide this information with block message we need to collect all messages and expect specified order. By default if we failed to reconstruct full block we log error message and increase invalid_full_blocks_total counter in prometheus metrics. If you want to panic on invalid reconstruction you can change option block_fail_action in config to panic (default value is log).

Filters for streamed data

Please check yellowstone-grpc-proto/proto/geyser.proto for details.

• commitment — commitment level: processed / confirmed / finalized
• accounts_data_slice — array of objects { offset: uint64, length: uint64 }, allow to receive only required data from accounts
• ping — optional boolean field. Some cloud providers (like Cloudflare, Fly.io) close the stream if client doesn't send anything during some time. As workaround you can send same filter every N seconds, but this would be not optimal since you need to keep this filter. Instead, you can send subscribe request with ping field set to true and ignore rest of the fields in the request. Since we sent Ping message every 15s from the server, you can send subscribe request with ping as reply and receive Pong message.

Slots

• filter_by_commitment — by default slots sent for all commitment levels, but with this filter you can receive only selected commitment level

Account

Accounts can be filtered by:

• account — account Pubkey, match to any Pubkey from the array
• owner — account owner Pubkey, match to any Pubkey from the array
• filters — same as getProgramAccounts filters, array of dataSize or Memcmp (bytes, base58, base64 are supported)

If all fields are empty then all accounts are broadcasted. Otherwise fields work as logical AND and values in arrays as logical OR (except values in filters that works as logical AND).

Transactions

• vote — enable/disable broadcast vote transactions
• failed — enable/disable broadcast failed transactions
• signature — match only specified transaction
• account_include — filter transactions that use any account from the list
• account_exclude — opposite to account_include
• account_required — require all accounts from the list to be used in transaction

If all fields are empty then all transactions are broadcasted. Otherwise fields works as logical AND and values in arrays as logical OR.

Entries

Currently we do not have filters for the entries, all entries broadcasted.

Blocks

• account_include — filter transactions and accounts that use any account from the list
• include_transactions — include all transactions
• include_accounts — include all accounts updates
• include_entries — include all entries

Blocks meta

Same as Blocks but without transactions, accounts and entries. Currently we do not have filters for block meta, all messages are broadcasted.

Limit filters

It's possible to add limits for filters in the config. If filters field is omitted then filters don't have any limits.

"grpc": {
   "filters": {
      "accounts": {
         "max": 1,
         "any": false,
         "account_max": 10,
         "account_reject": ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"],
         "owner_max": 10,
         "owner_reject": ["11111111111111111111111111111111"]
      },
      "slots": {
         "max": 1
      },
      "transactions": {
         "max": 1,
         "any": false,
         "account_include_max": 10,
         "account_include_reject": ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"],
         "account_exclude_max": 10,
         "account_required_max": 10
      },
      "blocks": {
         "max": 1,
         "account_include_max": 10,
         "account_include_any": false,
         "account_include_reject": ["TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"],
         "include_transactions": true,
         "include_accounts" : false,
         "include_entries" : false
      },
      "blocks_meta": {
         "max": 1
      },
      "entry": {
         "max": 1
      }
   }
}

Unary gRPC methods

Ping

GetLatestBlockhash

GetBlockHeight

GetSlot

IsBlockhashValid

GetVersion

Examples

• Go
• Rust
• TypeScript

NOTE: Some load balancers will terminate gRPC connections if there are no messages sent from the client for a period of time. In order to mitigate this you need to send a message periodically. The ping field in the SubscribeRequest is used for this purpose. The gRPC server already sends pings to the client, so you can simply reply with a ping and your connection will remain open. You can see in the rust example how to reply to the ping from the server with the client.

Projects based on Geyser gRPC

• https://github.com/rpcpool/yellowstone-grpc-kafka — forward gRPC stream to Kafka, dedup, read stream from Kafka with gRPC server