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113 lines
2.5 KiB
113 lines
2.5 KiB
package ethtest
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import (
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"compress/gzip"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"math/big"
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"os"
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"strings"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/forkid"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rlp"
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)
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type Chain struct {
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blocks []*types.Block
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chainConfig *params.ChainConfig
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}
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func (c *Chain) WriteTo(writer io.Writer) error {
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for _, block := range c.blocks {
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if err := rlp.Encode(writer, block); err != nil {
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return err
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}
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}
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return nil
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}
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// Len returns the length of the chain.
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func (c *Chain) Len() int {
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return len(c.blocks)
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}
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// TD calculates the total difficulty of the chain.
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func (c *Chain) TD(height int) *big.Int { // TODO later on channge scheme so that the height is included in range
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sum := big.NewInt(0)
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for _, block := range c.blocks[:height] {
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sum.Add(sum, block.Difficulty())
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}
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return sum
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}
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// ForkID gets the fork id of the chain.
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func (c *Chain) ForkID() forkid.ID {
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return forkid.NewID(c.chainConfig, c.blocks[0].Hash(), uint64(c.Len()))
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}
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// Shorten returns a copy chain of a desired height from the imported
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func (c *Chain) Shorten(height int) *Chain {
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blocks := make([]*types.Block, height)
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copy(blocks, c.blocks[:height])
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config := *c.chainConfig
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return &Chain{
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blocks: blocks,
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chainConfig: &config,
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}
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}
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// Head returns the chain head.
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func (c *Chain) Head() *types.Block {
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return c.blocks[c.Len()-1]
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}
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// loadChain takes the given chain.rlp file, and decodes and returns
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// the blocks from the file.
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func loadChain(chainfile string, genesis string) (*Chain, error) {
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// Open the file handle and potentially unwrap the gzip stream
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fh, err := os.Open(chainfile)
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if err != nil {
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return nil, err
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}
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defer fh.Close()
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var reader io.Reader = fh
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if strings.HasSuffix(chainfile, ".gz") {
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if reader, err = gzip.NewReader(reader); err != nil {
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return nil, err
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}
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}
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stream := rlp.NewStream(reader, 0)
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var blocks []*types.Block
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for i := 0; ; i++ {
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var b types.Block
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if err := stream.Decode(&b); err == io.EOF {
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break
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} else if err != nil {
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return nil, fmt.Errorf("at block %d: %v", i, err)
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}
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blocks = append(blocks, &b)
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}
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// Open the file handle and potentially unwrap the gzip stream
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chainConfig, err := ioutil.ReadFile(genesis)
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if err != nil {
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return nil, err
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}
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var gen core.Genesis
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if err := json.Unmarshal(chainConfig, &gen); err != nil {
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return nil, err
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}
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return &Chain{
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blocks: blocks,
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chainConfig: gen.Config,
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}, nil
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}
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