go-pulse/cmd/devp2p/internal/ethtest/chain.go
rene a25899f3dc
cmd/devp2p: add eth protocol test suite (#21598)
This change adds a test framework for the "eth" protocol and some basic
tests. The tests can be run using the './devp2p rlpx eth-test' command.
2020-09-23 15:18:17 +02:00

114 lines
2.5 KiB
Go

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