* eth/gasestimator: early exit for plain transfer and error allowance * core, eth/gasestimator: hard guess at a possible required gas * internal/ethapi: update estimation tests with the error ratio * eth/gasestimator: I hate you linter * graphql: fix gas estimation test --------- Co-authored-by: Oren <orenyomtov@users.noreply.github.com>
		
			
				
	
	
		
			486 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
			
		
		
	
	
			486 lines
		
	
	
		
			18 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
// Copyright 2019 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 graphql
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import (
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	"context"
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	"encoding/json"
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	"fmt"
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	"io"
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	"math/big"
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	"net/http"
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	"strings"
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	"testing"
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	"time"
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	"github.com/ethereum/go-ethereum/common"
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	"github.com/ethereum/go-ethereum/consensus"
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	"github.com/ethereum/go-ethereum/consensus/beacon"
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	"github.com/ethereum/go-ethereum/consensus/ethash"
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	"github.com/ethereum/go-ethereum/core"
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	"github.com/ethereum/go-ethereum/core/types"
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	"github.com/ethereum/go-ethereum/core/vm"
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	"github.com/ethereum/go-ethereum/crypto"
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	"github.com/ethereum/go-ethereum/eth"
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	"github.com/ethereum/go-ethereum/eth/ethconfig"
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	"github.com/ethereum/go-ethereum/eth/filters"
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	"github.com/ethereum/go-ethereum/node"
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	"github.com/ethereum/go-ethereum/params"
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	"github.com/stretchr/testify/assert"
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)
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func TestBuildSchema(t *testing.T) {
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	ddir := t.TempDir()
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	// Copy config
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	conf := node.DefaultConfig
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	conf.DataDir = ddir
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	stack, err := node.New(&conf)
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	if err != nil {
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		t.Fatalf("could not create new node: %v", err)
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	}
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	defer stack.Close()
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	// Make sure the schema can be parsed and matched up to the object model.
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	if _, err := newHandler(stack, nil, nil, []string{}, []string{}); err != nil {
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		t.Errorf("Could not construct GraphQL handler: %v", err)
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	}
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}
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// Tests that a graphQL request is successfully handled when graphql is enabled on the specified endpoint
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func TestGraphQLBlockSerialization(t *testing.T) {
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	stack := createNode(t)
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	defer stack.Close()
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	genesis := &core.Genesis{
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		Config:     params.AllEthashProtocolChanges,
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		GasLimit:   11500000,
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		Difficulty: big.NewInt(1048576),
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	}
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	newGQLService(t, stack, false, genesis, 10, func(i int, gen *core.BlockGen) {})
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	// start node
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	if err := stack.Start(); err != nil {
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		t.Fatalf("could not start node: %v", err)
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	}
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	for i, tt := range []struct {
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		body string
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		want string
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		code int
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	}{
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		{ // Should return latest block
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			body: `{"query": "{block{number}}","variables": null}`,
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			want: `{"data":{"block":{"number":"0xa"}}}`,
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			code: 200,
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		},
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		{ // Should return info about latest block
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			body: `{"query": "{block{number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":{"number":"0xa","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:0){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":{"number":"0x0","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:-1){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":null}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:-500){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":null}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:\"0\"){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":{"number":"0x0","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:\"-33\"){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":null}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:\"1337\"){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":null}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:\"0x0\"){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"data":{"block":{"number":"0x0","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
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			//want: `{"errors":[{"message":"strconv.ParseInt: parsing \"0x0\": invalid syntax"}],"data":{}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{block(number:\"a\"){number,gasUsed,gasLimit}}","variables": null}`,
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			want: `{"errors":[{"message":"strconv.ParseInt: parsing \"a\": invalid syntax"}],"data":{}}`,
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			code: 400,
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		},
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		{
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			body: `{"query": "{bleh{number}}","variables": null}"`,
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			want: `{"errors":[{"message":"Cannot query field \"bleh\" on type \"Query\".","locations":[{"line":1,"column":2}]}]}`,
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			code: 400,
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		},
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		// should return `estimateGas` as decimal
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		{
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			body: `{"query": "{block{ estimateGas(data:{}) }}"}`,
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			want: `{"data":{"block":{"estimateGas":"0xd221"}}}`,
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			code: 200,
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		},
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		// should return `status` as decimal
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		{
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			body: `{"query": "{block {number call (data : {from : \"0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b\", to: \"0x6295ee1b4f6dd65047762f924ecd367c17eabf8f\", data :\"0x12a7b914\"}){data status}}}"}`,
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			want: `{"data":{"block":{"number":"0xa","call":{"data":"0x","status":"0x1"}}}}`,
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			code: 200,
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		},
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		{
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			body: `{"query": "{blocks {number}}"}`,
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			want: `{"errors":[{"message":"from block number must be specified","path":["blocks"]}],"data":null}`,
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			code: 400,
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		},
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	} {
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		resp, err := http.Post(fmt.Sprintf("%s/graphql", stack.HTTPEndpoint()), "application/json", strings.NewReader(tt.body))
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		if err != nil {
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			t.Fatalf("could not post: %v", err)
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		}
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		bodyBytes, err := io.ReadAll(resp.Body)
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		resp.Body.Close()
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		if err != nil {
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			t.Fatalf("could not read from response body: %v", err)
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		}
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		if have := string(bodyBytes); have != tt.want {
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			t.Errorf("testcase %d %s,\nhave:\n%v\nwant:\n%v", i, tt.body, have, tt.want)
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		}
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		if tt.code != resp.StatusCode {
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			t.Errorf("testcase %d %s,\nwrong statuscode, have: %v, want: %v", i, tt.body, resp.StatusCode, tt.code)
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		}
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		if ctype := resp.Header.Get("Content-Type"); ctype != "application/json" {
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			t.Errorf("testcase %d \nwrong Content-Type, have: %v, want: %v", i, ctype, "application/json")
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		}
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	}
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}
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func TestGraphQLBlockSerializationEIP2718(t *testing.T) {
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	// Account for signing txes
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	var (
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		key, _  = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
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		address = crypto.PubkeyToAddress(key.PublicKey)
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		funds   = big.NewInt(1000000000000000)
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		dad     = common.HexToAddress("0x0000000000000000000000000000000000000dad")
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	)
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	stack := createNode(t)
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	defer stack.Close()
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	genesis := &core.Genesis{
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		Config:     params.AllEthashProtocolChanges,
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		GasLimit:   11500000,
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		Difficulty: big.NewInt(1048576),
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		Alloc: core.GenesisAlloc{
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			address: {Balance: funds},
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			// The address 0xdad sloads 0x00 and 0x01
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			dad: {
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				Code:    []byte{byte(vm.PC), byte(vm.PC), byte(vm.SLOAD), byte(vm.SLOAD)},
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				Nonce:   0,
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				Balance: big.NewInt(0),
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			},
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		},
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		BaseFee: big.NewInt(params.InitialBaseFee),
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	}
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	signer := types.LatestSigner(genesis.Config)
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	newGQLService(t, stack, false, genesis, 1, func(i int, gen *core.BlockGen) {
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		gen.SetCoinbase(common.Address{1})
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		tx, _ := types.SignNewTx(key, signer, &types.LegacyTx{
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			Nonce:    uint64(0),
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			To:       &dad,
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			Value:    big.NewInt(100),
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			Gas:      50000,
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			GasPrice: big.NewInt(params.InitialBaseFee),
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		})
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		gen.AddTx(tx)
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		tx, _ = types.SignNewTx(key, signer, &types.AccessListTx{
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			ChainID:  genesis.Config.ChainID,
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			Nonce:    uint64(1),
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			To:       &dad,
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			Gas:      30000,
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			GasPrice: big.NewInt(params.InitialBaseFee),
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			Value:    big.NewInt(50),
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			AccessList: types.AccessList{{
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				Address:     dad,
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				StorageKeys: []common.Hash{{0}},
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			}},
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		})
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		gen.AddTx(tx)
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	})
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	// start node
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	if err := stack.Start(); err != nil {
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		t.Fatalf("could not start node: %v", err)
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	}
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	for i, tt := range []struct {
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		body string
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		want string
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		code int
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	}{
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		{
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			body: `{"query": "{block {number transactions { from { address } to { address } value hash type accessList { address storageKeys } index}}}"}`,
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			want: `{"data":{"block":{"number":"0x1","transactions":[{"from":{"address":"0x71562b71999873db5b286df957af199ec94617f7"},"to":{"address":"0x0000000000000000000000000000000000000dad"},"value":"0x64","hash":"0xd864c9d7d37fade6b70164740540c06dd58bb9c3f6b46101908d6339db6a6a7b","type":"0x0","accessList":[],"index":"0x0"},{"from":{"address":"0x71562b71999873db5b286df957af199ec94617f7"},"to":{"address":"0x0000000000000000000000000000000000000dad"},"value":"0x32","hash":"0x19b35f8187b4e15fb59a9af469dca5dfa3cd363c11d372058c12f6482477b474","type":"0x1","accessList":[{"address":"0x0000000000000000000000000000000000000dad","storageKeys":["0x0000000000000000000000000000000000000000000000000000000000000000"]}],"index":"0x1"}]}}}`,
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			code: 200,
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		},
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	} {
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		resp, err := http.Post(fmt.Sprintf("%s/graphql", stack.HTTPEndpoint()), "application/json", strings.NewReader(tt.body))
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		if err != nil {
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			t.Fatalf("could not post: %v", err)
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		}
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		bodyBytes, err := io.ReadAll(resp.Body)
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		resp.Body.Close()
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		if err != nil {
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			t.Fatalf("could not read from response body: %v", err)
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		}
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		if have := string(bodyBytes); have != tt.want {
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			t.Errorf("testcase %d %s,\nhave:\n%v\nwant:\n%v", i, tt.body, have, tt.want)
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		}
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		if tt.code != resp.StatusCode {
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			t.Errorf("testcase %d %s,\nwrong statuscode, have: %v, want: %v", i, tt.body, resp.StatusCode, tt.code)
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		}
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	}
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}
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// Tests that a graphQL request is not handled successfully when graphql is not enabled on the specified endpoint
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func TestGraphQLHTTPOnSamePort_GQLRequest_Unsuccessful(t *testing.T) {
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	stack := createNode(t)
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	defer stack.Close()
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	if err := stack.Start(); err != nil {
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		t.Fatalf("could not start node: %v", err)
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	}
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	body := strings.NewReader(`{"query": "{block{number}}","variables": null}`)
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	resp, err := http.Post(fmt.Sprintf("%s/graphql", stack.HTTPEndpoint()), "application/json", body)
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	if err != nil {
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		t.Fatalf("could not post: %v", err)
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	}
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	resp.Body.Close()
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	// make sure the request is not handled successfully
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	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
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}
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func TestGraphQLConcurrentResolvers(t *testing.T) {
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	var (
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		key, _  = crypto.GenerateKey()
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		addr    = crypto.PubkeyToAddress(key.PublicKey)
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		dadStr  = "0x0000000000000000000000000000000000000dad"
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		dad     = common.HexToAddress(dadStr)
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		genesis = &core.Genesis{
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			Config:     params.AllEthashProtocolChanges,
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			GasLimit:   11500000,
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			Difficulty: big.NewInt(1048576),
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			Alloc: core.GenesisAlloc{
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				addr: {Balance: big.NewInt(params.Ether)},
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				dad: {
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					// LOG0(0, 0), LOG0(0, 0), RETURN(0, 0)
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					Code:    common.Hex2Bytes("60006000a060006000a060006000f3"),
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					Nonce:   0,
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					Balance: big.NewInt(0),
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				},
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			},
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		}
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		signer = types.LatestSigner(genesis.Config)
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		stack  = createNode(t)
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	)
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	defer stack.Close()
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	var tx *types.Transaction
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	handler, chain := newGQLService(t, stack, false, genesis, 1, func(i int, gen *core.BlockGen) {
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		tx, _ = types.SignNewTx(key, signer, &types.LegacyTx{To: &dad, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
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		gen.AddTx(tx)
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		tx, _ = types.SignNewTx(key, signer, &types.LegacyTx{To: &dad, Nonce: 1, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
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		gen.AddTx(tx)
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		tx, _ = types.SignNewTx(key, signer, &types.LegacyTx{To: &dad, Nonce: 2, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
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		gen.AddTx(tx)
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	})
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	// start node
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	if err := stack.Start(); err != nil {
 | 
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		t.Fatalf("could not start node: %v", err)
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						|
	}
 | 
						|
 | 
						|
	for i, tt := range []struct {
 | 
						|
		body string
 | 
						|
		want string
 | 
						|
	}{
 | 
						|
		// Multiple txes race to get/set the block hash.
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		{
 | 
						|
			body: "{block { transactions { logs { account { address } } } } }",
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			want: fmt.Sprintf(`{"block":{"transactions":[{"logs":[{"account":{"address":"%s"}},{"account":{"address":"%s"}}]},{"logs":[{"account":{"address":"%s"}},{"account":{"address":"%s"}}]},{"logs":[{"account":{"address":"%s"}},{"account":{"address":"%s"}}]}]}}`, dadStr, dadStr, dadStr, dadStr, dadStr, dadStr),
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		},
 | 
						|
		// Multiple fields of a tx race to resolve it. Happens in this case
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						|
		// because resolving the tx body belonging to a log is delayed.
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		{
 | 
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			body: `{block { logs(filter: {}) { transaction { nonce value gasPrice }}}}`,
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						|
			want: `{"block":{"logs":[{"transaction":{"nonce":"0x0","value":"0x0","gasPrice":"0x3b9aca00"}},{"transaction":{"nonce":"0x0","value":"0x0","gasPrice":"0x3b9aca00"}},{"transaction":{"nonce":"0x1","value":"0x0","gasPrice":"0x3b9aca00"}},{"transaction":{"nonce":"0x1","value":"0x0","gasPrice":"0x3b9aca00"}},{"transaction":{"nonce":"0x2","value":"0x0","gasPrice":"0x3b9aca00"}},{"transaction":{"nonce":"0x2","value":"0x0","gasPrice":"0x3b9aca00"}}]}}`,
 | 
						|
		},
 | 
						|
		// Multiple txes of a block race to set/retrieve receipts of a block.
 | 
						|
		{
 | 
						|
			body: "{block { transactions { status gasUsed } } }",
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						|
			want: `{"block":{"transactions":[{"status":"0x1","gasUsed":"0x5508"},{"status":"0x1","gasUsed":"0x5508"},{"status":"0x1","gasUsed":"0x5508"}]}}`,
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						|
		},
 | 
						|
		// Multiple fields of block race to resolve header and body.
 | 
						|
		{
 | 
						|
			body: "{ block { number hash gasLimit ommerCount transactionCount totalDifficulty } }",
 | 
						|
			want: fmt.Sprintf(`{"block":{"number":"0x1","hash":"%s","gasLimit":"0xaf79e0","ommerCount":"0x0","transactionCount":"0x3","totalDifficulty":"0x200000"}}`, chain[len(chain)-1].Hash()),
 | 
						|
		},
 | 
						|
		// Multiple fields of a block race to resolve the header and body.
 | 
						|
		{
 | 
						|
			body: fmt.Sprintf(`{ transaction(hash: "%s") { block { number hash gasLimit ommerCount transactionCount } } }`, tx.Hash()),
 | 
						|
			want: fmt.Sprintf(`{"transaction":{"block":{"number":"0x1","hash":"%s","gasLimit":"0xaf79e0","ommerCount":"0x0","transactionCount":"0x3"}}}`, chain[len(chain)-1].Hash()),
 | 
						|
		},
 | 
						|
		// Account fields race the resolve the state object.
 | 
						|
		{
 | 
						|
			body: fmt.Sprintf(`{ block { account(address: "%s") { balance transactionCount code } } }`, dadStr),
 | 
						|
			want: `{"block":{"account":{"balance":"0x0","transactionCount":"0x0","code":"0x60006000a060006000a060006000f3"}}}`,
 | 
						|
		},
 | 
						|
		// Test values for a non-existent account.
 | 
						|
		{
 | 
						|
			body: fmt.Sprintf(`{ block { account(address: "%s") { balance transactionCount code } } }`, "0x1111111111111111111111111111111111111111"),
 | 
						|
			want: `{"block":{"account":{"balance":"0x0","transactionCount":"0x0","code":"0x"}}}`,
 | 
						|
		},
 | 
						|
	} {
 | 
						|
		res := handler.Schema.Exec(context.Background(), tt.body, "", map[string]interface{}{})
 | 
						|
		if res.Errors != nil {
 | 
						|
			t.Fatalf("failed to execute query for testcase #%d: %v", i, res.Errors)
 | 
						|
		}
 | 
						|
		have, err := json.Marshal(res.Data)
 | 
						|
		if err != nil {
 | 
						|
			t.Fatalf("failed to encode graphql response for testcase #%d: %s", i, err)
 | 
						|
		}
 | 
						|
		if string(have) != tt.want {
 | 
						|
			t.Errorf("response unmatch for testcase #%d.\nExpected:\n%s\nGot:\n%s\n", i, tt.want, have)
 | 
						|
		}
 | 
						|
	}
 | 
						|
}
 | 
						|
 | 
						|
func TestWithdrawals(t *testing.T) {
 | 
						|
	var (
 | 
						|
		key, _ = crypto.GenerateKey()
 | 
						|
		addr   = crypto.PubkeyToAddress(key.PublicKey)
 | 
						|
 | 
						|
		genesis = &core.Genesis{
 | 
						|
			Config:     params.AllEthashProtocolChanges,
 | 
						|
			GasLimit:   11500000,
 | 
						|
			Difficulty: common.Big1,
 | 
						|
			Alloc: core.GenesisAlloc{
 | 
						|
				addr: {Balance: big.NewInt(params.Ether)},
 | 
						|
			},
 | 
						|
		}
 | 
						|
		signer = types.LatestSigner(genesis.Config)
 | 
						|
		stack  = createNode(t)
 | 
						|
	)
 | 
						|
	defer stack.Close()
 | 
						|
 | 
						|
	handler, _ := newGQLService(t, stack, true, genesis, 1, func(i int, gen *core.BlockGen) {
 | 
						|
		tx, _ := types.SignNewTx(key, signer, &types.LegacyTx{To: &common.Address{}, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
 | 
						|
		gen.AddTx(tx)
 | 
						|
		gen.AddWithdrawal(&types.Withdrawal{
 | 
						|
			Validator: 5,
 | 
						|
			Address:   common.Address{},
 | 
						|
			Amount:    10,
 | 
						|
		})
 | 
						|
	})
 | 
						|
	// start node
 | 
						|
	if err := stack.Start(); err != nil {
 | 
						|
		t.Fatalf("could not start node: %v", err)
 | 
						|
	}
 | 
						|
 | 
						|
	for i, tt := range []struct {
 | 
						|
		body string
 | 
						|
		want string
 | 
						|
	}{
 | 
						|
		// Genesis block has no withdrawals.
 | 
						|
		{
 | 
						|
			body: "{block(number: 0) { withdrawalsRoot withdrawals { index } } }",
 | 
						|
			want: `{"block":{"withdrawalsRoot":null,"withdrawals":null}}`,
 | 
						|
		},
 | 
						|
		{
 | 
						|
			body: "{block(number: 1) { withdrawalsRoot withdrawals { validator amount } } }",
 | 
						|
			want: `{"block":{"withdrawalsRoot":"0x8418fc1a48818928f6692f148e9b10e99a88edc093b095cb8ca97950284b553d","withdrawals":[{"validator":"0x5","amount":"0xa"}]}}`,
 | 
						|
		},
 | 
						|
	} {
 | 
						|
		res := handler.Schema.Exec(context.Background(), tt.body, "", map[string]interface{}{})
 | 
						|
		if res.Errors != nil {
 | 
						|
			t.Fatalf("failed to execute query for testcase #%d: %v", i, res.Errors)
 | 
						|
		}
 | 
						|
		have, err := json.Marshal(res.Data)
 | 
						|
		if err != nil {
 | 
						|
			t.Fatalf("failed to encode graphql response for testcase #%d: %s", i, err)
 | 
						|
		}
 | 
						|
		if string(have) != tt.want {
 | 
						|
			t.Errorf("response unmatch for testcase #%d.\nhave:\n%s\nwant:\n%s", i, have, tt.want)
 | 
						|
		}
 | 
						|
	}
 | 
						|
}
 | 
						|
 | 
						|
func createNode(t *testing.T) *node.Node {
 | 
						|
	stack, err := node.New(&node.Config{
 | 
						|
		HTTPHost:     "127.0.0.1",
 | 
						|
		HTTPPort:     0,
 | 
						|
		WSHost:       "127.0.0.1",
 | 
						|
		WSPort:       0,
 | 
						|
		HTTPTimeouts: node.DefaultConfig.HTTPTimeouts,
 | 
						|
	})
 | 
						|
	if err != nil {
 | 
						|
		t.Fatalf("could not create node: %v", err)
 | 
						|
	}
 | 
						|
	return stack
 | 
						|
}
 | 
						|
 | 
						|
func newGQLService(t *testing.T, stack *node.Node, shanghai bool, gspec *core.Genesis, genBlocks int, genfunc func(i int, gen *core.BlockGen)) (*handler, []*types.Block) {
 | 
						|
	ethConf := ðconfig.Config{
 | 
						|
		Genesis:        gspec,
 | 
						|
		NetworkId:      1337,
 | 
						|
		TrieCleanCache: 5,
 | 
						|
		TrieDirtyCache: 5,
 | 
						|
		TrieTimeout:    60 * time.Minute,
 | 
						|
		SnapshotCache:  5,
 | 
						|
	}
 | 
						|
	var engine consensus.Engine = ethash.NewFaker()
 | 
						|
	if shanghai {
 | 
						|
		engine = beacon.NewFaker()
 | 
						|
		chainCfg := gspec.Config
 | 
						|
		chainCfg.TerminalTotalDifficultyPassed = true
 | 
						|
		chainCfg.TerminalTotalDifficulty = common.Big0
 | 
						|
		// GenerateChain will increment timestamps by 10.
 | 
						|
		// Shanghai upgrade at block 1.
 | 
						|
		shanghaiTime := uint64(5)
 | 
						|
		chainCfg.ShanghaiTime = &shanghaiTime
 | 
						|
	}
 | 
						|
	ethBackend, err := eth.New(stack, ethConf)
 | 
						|
	if err != nil {
 | 
						|
		t.Fatalf("could not create eth backend: %v", err)
 | 
						|
	}
 | 
						|
	// Create some blocks and import them
 | 
						|
	chain, _ := core.GenerateChain(params.AllEthashProtocolChanges, ethBackend.BlockChain().Genesis(),
 | 
						|
		engine, ethBackend.ChainDb(), genBlocks, genfunc)
 | 
						|
	_, err = ethBackend.BlockChain().InsertChain(chain)
 | 
						|
	if err != nil {
 | 
						|
		t.Fatalf("could not create import blocks: %v", err)
 | 
						|
	}
 | 
						|
	// Set up handler
 | 
						|
	filterSystem := filters.NewFilterSystem(ethBackend.APIBackend, filters.Config{})
 | 
						|
	handler, err := newHandler(stack, ethBackend.APIBackend, filterSystem, []string{}, []string{})
 | 
						|
	if err != nil {
 | 
						|
		t.Fatalf("could not create graphql service: %v", err)
 | 
						|
	}
 | 
						|
	return handler, chain
 | 
						|
}
 |