plugeth/cmd/geth/genesis_test.go

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// Copyright 2016 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"fmt"
"os"
"path/filepath"
"strconv"
"testing"
)
var customGenesisTests = []struct {
genesis string
query string
result string
}{
// Genesis file with an empty chain configuration (ensure missing fields work)
{
genesis: `{
"alloc" : {},
"coinbase" : "0x0000000000000000000000000000000000000000",
"difficulty" : "0x20000",
"extraData" : "",
"gasLimit" : "0x2fefd8",
"nonce" : "0x0000000000001338",
"mixhash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"timestamp" : "0x00",
"config" : {
"terminalTotalDifficultyPassed": true
}
}`,
query: "eth.getBlock(0).nonce",
result: "0x0000000000001338",
},
// Genesis file with specific chain configurations
{
genesis: `{
"alloc" : {},
"coinbase" : "0x0000000000000000000000000000000000000000",
"difficulty" : "0x20000",
"extraData" : "",
"gasLimit" : "0x2fefd8",
"nonce" : "0x0000000000001339",
"mixhash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"timestamp" : "0x00",
"config" : {
"homesteadBlock" : 42,
"daoForkBlock" : 141,
"daoForkSupport" : true,
"terminalTotalDifficultyPassed" : true
}
}`,
query: "eth.getBlock(0).nonce",
result: "0x0000000000001339",
},
}
// Tests that initializing Geth with a custom genesis block and chain definitions
// work properly.
func TestCustomGenesis(t *testing.T) {
t.Parallel()
for i, tt := range customGenesisTests {
// Create a temporary data directory to use and inspect later
datadir := t.TempDir()
// Initialize the data directory with the custom genesis block
json := filepath.Join(datadir, "genesis.json")
if err := os.WriteFile(json, []byte(tt.genesis), 0600); err != nil {
t.Fatalf("test %d: failed to write genesis file: %v", i, err)
}
runGeth(t, "--datadir", datadir, "init", json).WaitExit()
// Query the custom genesis block
geth := runGeth(t, "--networkid", "1337", "--syncmode=full", "--cache", "16",
"--datadir", datadir, "--maxpeers", "0", "--port", "0", "--authrpc.port", "0",
"--nodiscover", "--nat", "none", "--ipcdisable",
"--exec", tt.query, "console")
geth.ExpectRegexp(tt.result)
geth.ExpectExit()
}
}
// TestCustomBackend that the backend selection and detection (leveldb vs pebble) works properly.
func TestCustomBackend(t *testing.T) {
t.Parallel()
// Test pebble, but only on 64-bit platforms
if strconv.IntSize != 64 {
t.Skip("Custom backends are only available on 64-bit platform")
}
genesis := `{
"alloc" : {},
"coinbase" : "0x0000000000000000000000000000000000000000",
"difficulty" : "0x20000",
"extraData" : "",
"gasLimit" : "0x2fefd8",
"nonce" : "0x0000000000001338",
"mixhash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
"timestamp" : "0x00",
"config" : {
"terminalTotalDifficultyPassed": true
}
}`
type backendTest struct {
initArgs []string
initExpect string
execArgs []string
execExpect string
}
testfunc := func(t *testing.T, tt backendTest) error {
// Create a temporary data directory to use and inspect later
datadir := t.TempDir()
// Initialize the data directory with the custom genesis block
json := filepath.Join(datadir, "genesis.json")
if err := os.WriteFile(json, []byte(genesis), 0600); err != nil {
return fmt.Errorf("failed to write genesis file: %v", err)
}
{ // Init
args := append(tt.initArgs, "--datadir", datadir, "init", json)
geth := runGeth(t, args...)
geth.ExpectRegexp(tt.initExpect)
geth.ExpectExit()
}
{ // Exec + query
args := append(tt.execArgs, "--networkid", "1337", "--syncmode=full", "--cache", "16",
"--datadir", datadir, "--maxpeers", "0", "--port", "0", "--authrpc.port", "0",
"--nodiscover", "--nat", "none", "--ipcdisable",
"--exec", "eth.getBlock(0).nonce", "console")
geth := runGeth(t, args...)
geth.ExpectRegexp(tt.execExpect)
geth.ExpectExit()
}
return nil
}
for i, tt := range []backendTest{
{ // When not specified, it should default to pebble
execArgs: []string{"--db.engine", "pebble"},
execExpect: "0x0000000000001338",
},
{ // Explicit leveldb
initArgs: []string{"--db.engine", "leveldb"},
execArgs: []string{"--db.engine", "leveldb"},
execExpect: "0x0000000000001338",
},
{ // Explicit leveldb first, then autodiscover
initArgs: []string{"--db.engine", "leveldb"},
execExpect: "0x0000000000001338",
},
{ // Explicit pebble
initArgs: []string{"--db.engine", "pebble"},
execArgs: []string{"--db.engine", "pebble"},
execExpect: "0x0000000000001338",
},
{ // Explicit pebble, then auto-discover
initArgs: []string{"--db.engine", "pebble"},
execExpect: "0x0000000000001338",
},
{ // Can't start pebble on top of leveldb
initArgs: []string{"--db.engine", "leveldb"},
execArgs: []string{"--db.engine", "pebble"},
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execExpect: `Fatal: Failed to register the Ethereum service: db.engine choice was pebble but found pre-existing leveldb database in specified data directory`,
},
{ // Can't start leveldb on top of pebble
initArgs: []string{"--db.engine", "pebble"},
execArgs: []string{"--db.engine", "leveldb"},
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execExpect: `Fatal: Failed to register the Ethereum service: db.engine choice was leveldb but found pre-existing pebble database in specified data directory`,
},
{ // Reject invalid backend choice
initArgs: []string{"--db.engine", "mssql"},
initExpect: `Fatal: Invalid choice for db.engine 'mssql', allowed 'leveldb' or 'pebble'`,
// Since the init fails, this will return the (default) mainnet genesis
// block nonce
execExpect: `0x0000000000000042`,
},
} {
if err := testfunc(t, tt); err != nil {
t.Fatalf("test %d-leveldb: %v", i, err)
}
}
}