github.com/theQRL/go-zond@v0.1.1/graphql/graphql_test.go (about)

     1  // Copyright 2019 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package graphql
    18  
    19  import (
    20  	"context"
    21  	"encoding/json"
    22  	"fmt"
    23  	"io"
    24  	"math/big"
    25  	"net/http"
    26  	"strings"
    27  	"testing"
    28  	"time"
    29  
    30  	"github.com/theQRL/go-zond/common"
    31  	"github.com/theQRL/go-zond/consensus"
    32  	"github.com/theQRL/go-zond/consensus/beacon"
    33  	"github.com/theQRL/go-zond/consensus/ethash"
    34  	"github.com/theQRL/go-zond/core"
    35  	"github.com/theQRL/go-zond/core/types"
    36  	"github.com/theQRL/go-zond/core/vm"
    37  	"github.com/theQRL/go-zond/crypto"
    38  	"github.com/theQRL/go-zond/node"
    39  	"github.com/theQRL/go-zond/params"
    40  	"github.com/theQRL/go-zond/zond"
    41  	"github.com/theQRL/go-zond/zond/ethconfig"
    42  	"github.com/theQRL/go-zond/zond/filters"
    43  
    44  	"github.com/stretchr/testify/assert"
    45  )
    46  
    47  func TestBuildSchema(t *testing.T) {
    48  	ddir := t.TempDir()
    49  	// Copy config
    50  	conf := node.DefaultConfig
    51  	conf.DataDir = ddir
    52  	stack, err := node.New(&conf)
    53  	if err != nil {
    54  		t.Fatalf("could not create new node: %v", err)
    55  	}
    56  	defer stack.Close()
    57  	// Make sure the schema can be parsed and matched up to the object model.
    58  	if _, err := newHandler(stack, nil, nil, []string{}, []string{}); err != nil {
    59  		t.Errorf("Could not construct GraphQL handler: %v", err)
    60  	}
    61  }
    62  
    63  // Tests that a graphQL request is successfully handled when graphql is enabled on the specified endpoint
    64  func TestGraphQLBlockSerialization(t *testing.T) {
    65  	stack := createNode(t)
    66  	defer stack.Close()
    67  	genesis := &core.Genesis{
    68  		Config:     params.AllEthashProtocolChanges,
    69  		GasLimit:   11500000,
    70  		Difficulty: big.NewInt(1048576),
    71  	}
    72  	newGQLService(t, stack, false, genesis, 10, func(i int, gen *core.BlockGen) {})
    73  	// start node
    74  	if err := stack.Start(); err != nil {
    75  		t.Fatalf("could not start node: %v", err)
    76  	}
    77  
    78  	for i, tt := range []struct {
    79  		body string
    80  		want string
    81  		code int
    82  	}{
    83  		{ // Should return latest block
    84  			body: `{"query": "{block{number}}","variables": null}`,
    85  			want: `{"data":{"block":{"number":"0xa"}}}`,
    86  			code: 200,
    87  		},
    88  		{ // Should return info about latest block
    89  			body: `{"query": "{block{number,gasUsed,gasLimit}}","variables": null}`,
    90  			want: `{"data":{"block":{"number":"0xa","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
    91  			code: 200,
    92  		},
    93  		{
    94  			body: `{"query": "{block(number:0){number,gasUsed,gasLimit}}","variables": null}`,
    95  			want: `{"data":{"block":{"number":"0x0","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
    96  			code: 200,
    97  		},
    98  		{
    99  			body: `{"query": "{block(number:-1){number,gasUsed,gasLimit}}","variables": null}`,
   100  			want: `{"data":{"block":null}}`,
   101  			code: 200,
   102  		},
   103  		{
   104  			body: `{"query": "{block(number:-500){number,gasUsed,gasLimit}}","variables": null}`,
   105  			want: `{"data":{"block":null}}`,
   106  			code: 200,
   107  		},
   108  		{
   109  			body: `{"query": "{block(number:\"0\"){number,gasUsed,gasLimit}}","variables": null}`,
   110  			want: `{"data":{"block":{"number":"0x0","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
   111  			code: 200,
   112  		},
   113  		{
   114  			body: `{"query": "{block(number:\"-33\"){number,gasUsed,gasLimit}}","variables": null}`,
   115  			want: `{"data":{"block":null}}`,
   116  			code: 200,
   117  		},
   118  		{
   119  			body: `{"query": "{block(number:\"1337\"){number,gasUsed,gasLimit}}","variables": null}`,
   120  			want: `{"data":{"block":null}}`,
   121  			code: 200,
   122  		},
   123  		{
   124  			body: `{"query": "{block(number:\"0x0\"){number,gasUsed,gasLimit}}","variables": null}`,
   125  			want: `{"data":{"block":{"number":"0x0","gasUsed":"0x0","gasLimit":"0xaf79e0"}}}`,
   126  			//want: `{"errors":[{"message":"strconv.ParseInt: parsing \"0x0\": invalid syntax"}],"data":{}}`,
   127  			code: 200,
   128  		},
   129  		{
   130  			body: `{"query": "{block(number:\"a\"){number,gasUsed,gasLimit}}","variables": null}`,
   131  			want: `{"errors":[{"message":"strconv.ParseInt: parsing \"a\": invalid syntax"}],"data":{}}`,
   132  			code: 400,
   133  		},
   134  		{
   135  			body: `{"query": "{bleh{number}}","variables": null}"`,
   136  			want: `{"errors":[{"message":"Cannot query field \"bleh\" on type \"Query\".","locations":[{"line":1,"column":2}]}]}`,
   137  			code: 400,
   138  		},
   139  		// should return `estimateGas` as decimal
   140  		{
   141  			body: `{"query": "{block{ estimateGas(data:{}) }}"}`,
   142  			want: `{"data":{"block":{"estimateGas":"0xcf08"}}}`,
   143  			code: 200,
   144  		},
   145  		// should return `status` as decimal
   146  		{
   147  			body: `{"query": "{block {number call (data : {from : \"0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b\", to: \"0x6295ee1b4f6dd65047762f924ecd367c17eabf8f\", data :\"0x12a7b914\"}){data status}}}"}`,
   148  			want: `{"data":{"block":{"number":"0xa","call":{"data":"0x","status":"0x1"}}}}`,
   149  			code: 200,
   150  		},
   151  	} {
   152  		resp, err := http.Post(fmt.Sprintf("%s/graphql", stack.HTTPEndpoint()), "application/json", strings.NewReader(tt.body))
   153  		if err != nil {
   154  			t.Fatalf("could not post: %v", err)
   155  		}
   156  		bodyBytes, err := io.ReadAll(resp.Body)
   157  		resp.Body.Close()
   158  		if err != nil {
   159  			t.Fatalf("could not read from response body: %v", err)
   160  		}
   161  		if have := string(bodyBytes); have != tt.want {
   162  			t.Errorf("testcase %d %s,\nhave:\n%v\nwant:\n%v", i, tt.body, have, tt.want)
   163  		}
   164  		if tt.code != resp.StatusCode {
   165  			t.Errorf("testcase %d %s,\nwrong statuscode, have: %v, want: %v", i, tt.body, resp.StatusCode, tt.code)
   166  		}
   167  	}
   168  }
   169  
   170  func TestGraphQLBlockSerializationEIP2718(t *testing.T) {
   171  	// Account for signing txes
   172  	var (
   173  		key, _  = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
   174  		address = crypto.PubkeyToAddress(key.PublicKey)
   175  		funds   = big.NewInt(1000000000000000)
   176  		dad     = common.HexToAddress("0x0000000000000000000000000000000000000dad")
   177  	)
   178  	stack := createNode(t)
   179  	defer stack.Close()
   180  	genesis := &core.Genesis{
   181  		Config:     params.AllEthashProtocolChanges,
   182  		GasLimit:   11500000,
   183  		Difficulty: big.NewInt(1048576),
   184  		Alloc: core.GenesisAlloc{
   185  			address: {Balance: funds},
   186  			// The address 0xdad sloads 0x00 and 0x01
   187  			dad: {
   188  				Code:    []byte{byte(vm.PC), byte(vm.PC), byte(vm.SLOAD), byte(vm.SLOAD)},
   189  				Nonce:   0,
   190  				Balance: big.NewInt(0),
   191  			},
   192  		},
   193  		BaseFee: big.NewInt(params.InitialBaseFee),
   194  	}
   195  	signer := types.LatestSigner(genesis.Config)
   196  	newGQLService(t, stack, false, genesis, 1, func(i int, gen *core.BlockGen) {
   197  		gen.SetCoinbase(common.Address{1})
   198  		tx, _ := types.SignNewTx(key, signer, &types.LegacyTx{
   199  			Nonce:    uint64(0),
   200  			To:       &dad,
   201  			Value:    big.NewInt(100),
   202  			Gas:      50000,
   203  			GasPrice: big.NewInt(params.InitialBaseFee),
   204  		})
   205  		gen.AddTx(tx)
   206  		tx, _ = types.SignNewTx(key, signer, &types.AccessListTx{
   207  			ChainID:  genesis.Config.ChainID,
   208  			Nonce:    uint64(1),
   209  			To:       &dad,
   210  			Gas:      30000,
   211  			GasPrice: big.NewInt(params.InitialBaseFee),
   212  			Value:    big.NewInt(50),
   213  			AccessList: types.AccessList{{
   214  				Address:     dad,
   215  				StorageKeys: []common.Hash{{0}},
   216  			}},
   217  		})
   218  		gen.AddTx(tx)
   219  	})
   220  	// start node
   221  	if err := stack.Start(); err != nil {
   222  		t.Fatalf("could not start node: %v", err)
   223  	}
   224  
   225  	for i, tt := range []struct {
   226  		body string
   227  		want string
   228  		code int
   229  	}{
   230  		{
   231  			body: `{"query": "{block {number transactions { from { address } to { address } value hash type accessList { address storageKeys } index}}}"}`,
   232  			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"}]}}}`,
   233  			code: 200,
   234  		},
   235  	} {
   236  		resp, err := http.Post(fmt.Sprintf("%s/graphql", stack.HTTPEndpoint()), "application/json", strings.NewReader(tt.body))
   237  		if err != nil {
   238  			t.Fatalf("could not post: %v", err)
   239  		}
   240  		bodyBytes, err := io.ReadAll(resp.Body)
   241  		resp.Body.Close()
   242  		if err != nil {
   243  			t.Fatalf("could not read from response body: %v", err)
   244  		}
   245  		if have := string(bodyBytes); have != tt.want {
   246  			t.Errorf("testcase %d %s,\nhave:\n%v\nwant:\n%v", i, tt.body, have, tt.want)
   247  		}
   248  		if tt.code != resp.StatusCode {
   249  			t.Errorf("testcase %d %s,\nwrong statuscode, have: %v, want: %v", i, tt.body, resp.StatusCode, tt.code)
   250  		}
   251  	}
   252  }
   253  
   254  // Tests that a graphQL request is not handled successfully when graphql is not enabled on the specified endpoint
   255  func TestGraphQLHTTPOnSamePort_GQLRequest_Unsuccessful(t *testing.T) {
   256  	stack := createNode(t)
   257  	defer stack.Close()
   258  	if err := stack.Start(); err != nil {
   259  		t.Fatalf("could not start node: %v", err)
   260  	}
   261  	body := strings.NewReader(`{"query": "{block{number}}","variables": null}`)
   262  	resp, err := http.Post(fmt.Sprintf("%s/graphql", stack.HTTPEndpoint()), "application/json", body)
   263  	if err != nil {
   264  		t.Fatalf("could not post: %v", err)
   265  	}
   266  	resp.Body.Close()
   267  	// make sure the request is not handled successfully
   268  	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
   269  }
   270  
   271  func TestGraphQLConcurrentResolvers(t *testing.T) {
   272  	var (
   273  		key, _  = crypto.GenerateKey()
   274  		addr    = crypto.PubkeyToAddress(key.PublicKey)
   275  		dadStr  = "0x0000000000000000000000000000000000000dad"
   276  		dad     = common.HexToAddress(dadStr)
   277  		genesis = &core.Genesis{
   278  			Config:     params.AllEthashProtocolChanges,
   279  			GasLimit:   11500000,
   280  			Difficulty: big.NewInt(1048576),
   281  			Alloc: core.GenesisAlloc{
   282  				addr: {Balance: big.NewInt(params.Ether)},
   283  				dad: {
   284  					// LOG0(0, 0), LOG0(0, 0), RETURN(0, 0)
   285  					Code:    common.Hex2Bytes("60006000a060006000a060006000f3"),
   286  					Nonce:   0,
   287  					Balance: big.NewInt(0),
   288  				},
   289  			},
   290  		}
   291  		signer = types.LatestSigner(genesis.Config)
   292  		stack  = createNode(t)
   293  	)
   294  	defer stack.Close()
   295  
   296  	var tx *types.Transaction
   297  	handler, chain := newGQLService(t, stack, false, genesis, 1, func(i int, gen *core.BlockGen) {
   298  		tx, _ = types.SignNewTx(key, signer, &types.LegacyTx{To: &dad, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
   299  		gen.AddTx(tx)
   300  		tx, _ = types.SignNewTx(key, signer, &types.LegacyTx{To: &dad, Nonce: 1, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
   301  		gen.AddTx(tx)
   302  		tx, _ = types.SignNewTx(key, signer, &types.LegacyTx{To: &dad, Nonce: 2, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
   303  		gen.AddTx(tx)
   304  	})
   305  	// start node
   306  	if err := stack.Start(); err != nil {
   307  		t.Fatalf("could not start node: %v", err)
   308  	}
   309  
   310  	for i, tt := range []struct {
   311  		body string
   312  		want string
   313  	}{
   314  		// Multiple txes race to get/set the block hash.
   315  		{
   316  			body: "{block { transactions { logs { account { address } } } } }",
   317  			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),
   318  		},
   319  		// Multiple fields of a tx race to resolve it. Happens in this case
   320  		// because resolving the tx body belonging to a log is delayed.
   321  		{
   322  			body: `{block { logs(filter: {}) { transaction { nonce value gasPrice }}}}`,
   323  			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"}}]}}`,
   324  		},
   325  		// Multiple txes of a block race to set/retrieve receipts of a block.
   326  		{
   327  			body: "{block { transactions { status gasUsed } } }",
   328  			want: `{"block":{"transactions":[{"status":"0x1","gasUsed":"0x5508"},{"status":"0x1","gasUsed":"0x5508"},{"status":"0x1","gasUsed":"0x5508"}]}}`,
   329  		},
   330  		// Multiple fields of block race to resolve header and body.
   331  		{
   332  			body: "{ block { number hash gasLimit ommerCount transactionCount totalDifficulty } }",
   333  			want: fmt.Sprintf(`{"block":{"number":"0x1","hash":"%s","gasLimit":"0xaf79e0","ommerCount":"0x0","transactionCount":"0x3","totalDifficulty":"0x200000"}}`, chain[len(chain)-1].Hash()),
   334  		},
   335  		// Multiple fields of a block race to resolve the header and body.
   336  		{
   337  			body: fmt.Sprintf(`{ transaction(hash: "%s") { block { number hash gasLimit ommerCount transactionCount } } }`, tx.Hash()),
   338  			want: fmt.Sprintf(`{"transaction":{"block":{"number":"0x1","hash":"%s","gasLimit":"0xaf79e0","ommerCount":"0x0","transactionCount":"0x3"}}}`, chain[len(chain)-1].Hash()),
   339  		},
   340  		// Account fields race the resolve the state object.
   341  		{
   342  			body: fmt.Sprintf(`{ block { account(address: "%s") { balance transactionCount code } } }`, dadStr),
   343  			want: `{"block":{"account":{"balance":"0x0","transactionCount":"0x0","code":"0x60006000a060006000a060006000f3"}}}`,
   344  		},
   345  		// Test values for a non-existent account.
   346  		{
   347  			body: fmt.Sprintf(`{ block { account(address: "%s") { balance transactionCount code } } }`, "0x1111111111111111111111111111111111111111"),
   348  			want: `{"block":{"account":{"balance":"0x0","transactionCount":"0x0","code":"0x"}}}`,
   349  		},
   350  	} {
   351  		res := handler.Schema.Exec(context.Background(), tt.body, "", map[string]interface{}{})
   352  		if res.Errors != nil {
   353  			t.Fatalf("failed to execute query for testcase #%d: %v", i, res.Errors)
   354  		}
   355  		have, err := json.Marshal(res.Data)
   356  		if err != nil {
   357  			t.Fatalf("failed to encode graphql response for testcase #%d: %s", i, err)
   358  		}
   359  		if string(have) != tt.want {
   360  			t.Errorf("response unmatch for testcase #%d.\nExpected:\n%s\nGot:\n%s\n", i, tt.want, have)
   361  		}
   362  	}
   363  }
   364  
   365  func TestWithdrawals(t *testing.T) {
   366  	var (
   367  		key, _ = crypto.GenerateKey()
   368  		addr   = crypto.PubkeyToAddress(key.PublicKey)
   369  
   370  		genesis = &core.Genesis{
   371  			Config:     params.AllEthashProtocolChanges,
   372  			GasLimit:   11500000,
   373  			Difficulty: common.Big1,
   374  			Alloc: core.GenesisAlloc{
   375  				addr: {Balance: big.NewInt(params.Ether)},
   376  			},
   377  		}
   378  		signer = types.LatestSigner(genesis.Config)
   379  		stack  = createNode(t)
   380  	)
   381  	defer stack.Close()
   382  
   383  	handler, _ := newGQLService(t, stack, true, genesis, 1, func(i int, gen *core.BlockGen) {
   384  		tx, _ := types.SignNewTx(key, signer, &types.LegacyTx{To: &common.Address{}, Gas: 100000, GasPrice: big.NewInt(params.InitialBaseFee)})
   385  		gen.AddTx(tx)
   386  		gen.AddWithdrawal(&types.Withdrawal{
   387  			Validator: 5,
   388  			Address:   common.Address{},
   389  			Amount:    10,
   390  		})
   391  	})
   392  	// start node
   393  	if err := stack.Start(); err != nil {
   394  		t.Fatalf("could not start node: %v", err)
   395  	}
   396  
   397  	for i, tt := range []struct {
   398  		body string
   399  		want string
   400  	}{
   401  		// Genesis block has no withdrawals.
   402  		{
   403  			body: "{block(number: 0) { withdrawalsRoot withdrawals { index } } }",
   404  			want: `{"block":{"withdrawalsRoot":null,"withdrawals":null}}`,
   405  		},
   406  		{
   407  			body: "{block(number: 1) { withdrawalsRoot withdrawals { validator amount } } }",
   408  			want: `{"block":{"withdrawalsRoot":"0x8418fc1a48818928f6692f148e9b10e99a88edc093b095cb8ca97950284b553d","withdrawals":[{"validator":"0x5","amount":"0xa"}]}}`,
   409  		},
   410  	} {
   411  		res := handler.Schema.Exec(context.Background(), tt.body, "", map[string]interface{}{})
   412  		if res.Errors != nil {
   413  			t.Fatalf("failed to execute query for testcase #%d: %v", i, res.Errors)
   414  		}
   415  		have, err := json.Marshal(res.Data)
   416  		if err != nil {
   417  			t.Fatalf("failed to encode graphql response for testcase #%d: %s", i, err)
   418  		}
   419  		if string(have) != tt.want {
   420  			t.Errorf("response unmatch for testcase #%d.\nhave:\n%s\nwant:\n%s", i, have, tt.want)
   421  		}
   422  	}
   423  }
   424  
   425  func createNode(t *testing.T) *node.Node {
   426  	stack, err := node.New(&node.Config{
   427  		HTTPHost:     "127.0.0.1",
   428  		HTTPPort:     0,
   429  		WSHost:       "127.0.0.1",
   430  		WSPort:       0,
   431  		HTTPTimeouts: node.DefaultConfig.HTTPTimeouts,
   432  	})
   433  	if err != nil {
   434  		t.Fatalf("could not create node: %v", err)
   435  	}
   436  	return stack
   437  }
   438  
   439  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) {
   440  	ethConf := &ethconfig.Config{
   441  		Genesis:        gspec,
   442  		NetworkId:      1337,
   443  		TrieCleanCache: 5,
   444  		TrieDirtyCache: 5,
   445  		TrieTimeout:    60 * time.Minute,
   446  		SnapshotCache:  5,
   447  	}
   448  	var engine consensus.Engine = ethash.NewFaker()
   449  	if shanghai {
   450  		engine = beacon.NewFaker()
   451  		chainCfg := gspec.Config
   452  		chainCfg.TerminalTotalDifficultyPassed = true
   453  		chainCfg.TerminalTotalDifficulty = common.Big0
   454  		// GenerateChain will increment timestamps by 10.
   455  		// Shanghai upgrade at block 1.
   456  		shanghaiTime := uint64(5)
   457  		chainCfg.ShanghaiTime = &shanghaiTime
   458  	}
   459  	ethBackend, err := eth.New(stack, ethConf)
   460  	if err != nil {
   461  		t.Fatalf("could not create eth backend: %v", err)
   462  	}
   463  	// Create some blocks and import them
   464  	chain, _ := core.GenerateChain(params.AllEthashProtocolChanges, ethBackend.BlockChain().Genesis(),
   465  		engine, ethBackend.ChainDb(), genBlocks, genfunc)
   466  	_, err = ethBackend.BlockChain().InsertChain(chain)
   467  	if err != nil {
   468  		t.Fatalf("could not create import blocks: %v", err)
   469  	}
   470  	// Set up handler
   471  	filterSystem := filters.NewFilterSystem(ethBackend.APIBackend, filters.Config{})
   472  	handler, err := newHandler(stack, ethBackend.APIBackend, filterSystem, []string{}, []string{})
   473  	if err != nil {
   474  		t.Fatalf("could not create graphql service: %v", err)
   475  	}
   476  	return handler, chain
   477  }