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86 lines
3.4 KiB
86 lines
3.4 KiB
package hmyapi
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import (
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"context"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// PublicBlockChainAPI provides an API to access the Harmony blockchain.
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// It offers only methods that operate on public data that is freely available to anyone.
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type PublicBlockChainAPI struct {
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b Backend
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}
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// NewPublicBlockChainAPI creates a new Harmony blockchain API.
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func NewPublicBlockChainAPI(b Backend) *PublicBlockChainAPI {
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return &PublicBlockChainAPI{b}
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}
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// GetBlockByNumber returns the requested block. When blockNr is -1 the chain head is returned. When fullTx is true all
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// transactions in the block are returned in full detail, otherwise only the transaction hash is returned.
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func (s *PublicBlockChainAPI) GetBlockByNumber(ctx context.Context, blockNr rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
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block, err := s.b.BlockByNumber(ctx, blockNr)
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if block != nil {
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response, err := RPCMarshalBlock(block, false, false)
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if err == nil && blockNr == rpc.PendingBlockNumber {
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// Pending blocks need to nil out a few fields
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for _, field := range []string{"hash", "nonce", "miner"} {
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response[field] = nil
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}
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}
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return response, err
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}
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return nil, err
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}
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// GetBlockByHash returns the requested block. When fullTx is true all transactions in the block are returned in full
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// detail, otherwise only the transaction hash is returned.
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func (s *PublicBlockChainAPI) GetBlockByHash(ctx context.Context, blockHash common.Hash, fullTx bool) (map[string]interface{}, error) {
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block, err := s.b.GetBlock(ctx, blockHash)
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if block != nil {
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return RPCMarshalBlock(block, false, false)
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}
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return nil, err
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}
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// GetCode returns the code stored at the given address in the state for the given block number.
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func (s *PublicBlockChainAPI) GetCode(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (hexutil.Bytes, error) {
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state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
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if state == nil || err != nil {
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return nil, err
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}
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code := state.GetCode(address)
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return code, state.Error()
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}
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// GetStorageAt returns the storage from the state at the given address, key and
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// block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta block
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// numbers are also allowed.
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func (s *PublicBlockChainAPI) GetStorageAt(ctx context.Context, address common.Address, key string, blockNr rpc.BlockNumber) (hexutil.Bytes, error) {
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state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
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if state == nil || err != nil {
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return nil, err
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}
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res := state.GetState(address, common.HexToHash(key))
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return res[:], state.Error()
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}
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// GetBalance returns the amount of wei for the given address in the state of the
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// given block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta
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// block numbers are also allowed.
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func (s *PublicBlockChainAPI) GetBalance(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (*hexutil.Big, error) {
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state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
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if state == nil || err != nil {
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return nil, err
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}
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return (*hexutil.Big)(state.GetBalance(address)), state.Error()
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}
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// BlockNumber returns the block number of the chain head.
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func (s *PublicBlockChainAPI) BlockNumber() hexutil.Uint64 {
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header, _ := s.b.HeaderByNumber(context.Background(), rpc.LatestBlockNumber) // latest header should always be available
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return hexutil.Uint64(header.Number.Uint64())
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}
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