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60 lines
2.2 KiB
Go
60 lines
2.2 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package les
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import (
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"errors"
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"math/big"
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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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)
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var (
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errNoStableCheckpoint = errors.New("no stable checkpoint provided")
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)
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// PublicLesServerAPI provides an API to access the les server.
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// It offers only methods that operate on public data that is freely available to anyone.
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type PublicLesServerAPI struct {
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server *LesServer
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}
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// NewPublicLesServerAPI creates a new les server API.
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func NewPublicLesServerAPI(server *LesServer) *PublicLesServerAPI {
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return &PublicLesServerAPI{
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server: server,
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}
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}
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// Checkpoint returns the latest checkpoint package.
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//
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// The checkpoint package consists of 4 strings:
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// result[0], hex encoded latest section index
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// result[1], 32 bytes hex encoded latest section head hash
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// result[2], 32 bytes hex encoded latest section canonical hash trie root hash
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// result[3], 32 bytes hex encoded latest section bloom trie root hash
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func (api *PublicLesServerAPI) Checkpoint() ([4]string, error) {
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var res [4]string
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sectionIdx, sectionHead, chtRoot, bloomTrieRoot := api.server.getCheckpoint()
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if sectionHead == (common.Hash{}) || chtRoot == (common.Hash{}) || bloomTrieRoot == (common.Hash{}) {
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return res, errNoStableCheckpoint
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}
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res[0] = hexutil.Encode(big.NewInt(int64(sectionIdx)).Bytes())
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res[1], res[2], res[3] = sectionHead.Hex(), chtRoot.Hex(), bloomTrieRoot.Hex()
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return res, nil
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}
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