graphql.go 31.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

// Package graphql provides a GraphQL interface to Ethereum node data.
package graphql

import (
	"context"
22
	"errors"
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
	"fmt"
	"net"
	"net/http"
	"time"

	"github.com/ethereum/go-ethereum"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/core/rawdb"
	"github.com/ethereum/go-ethereum/core/state"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/core/vm"
	"github.com/ethereum/go-ethereum/eth"
	"github.com/ethereum/go-ethereum/eth/filters"
	"github.com/ethereum/go-ethereum/internal/ethapi"
	"github.com/ethereum/go-ethereum/log"
	"github.com/ethereum/go-ethereum/node"
	"github.com/ethereum/go-ethereum/p2p"
	"github.com/ethereum/go-ethereum/rlp"
	"github.com/ethereum/go-ethereum/rpc"
	graphqlgo "github.com/graph-gophers/graphql-go"
	"github.com/graph-gophers/graphql-go/relay"
)

47 48 49
var OnlyOnMainChainError = errors.New("This operation is only available for blocks on the canonical chain.")
var BlockInvariantError = errors.New("Block objects must be instantiated with at least one of num or hash.")

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133
// Account represents an Ethereum account at a particular block.
type Account struct {
	backend     *eth.EthAPIBackend
	address     common.Address
	blockNumber rpc.BlockNumber
}

// getState fetches the StateDB object for an account.
func (a *Account) getState(ctx context.Context) (*state.StateDB, error) {
	state, _, err := a.backend.StateAndHeaderByNumber(ctx, a.blockNumber)
	return state, err
}

func (a *Account) Address(ctx context.Context) (common.Address, error) {
	return a.address, nil
}

func (a *Account) Balance(ctx context.Context) (hexutil.Big, error) {
	state, err := a.getState(ctx)
	if err != nil {
		return hexutil.Big{}, err
	}

	return hexutil.Big(*state.GetBalance(a.address)), nil
}

func (a *Account) TransactionCount(ctx context.Context) (hexutil.Uint64, error) {
	state, err := a.getState(ctx)
	if err != nil {
		return 0, err
	}

	return hexutil.Uint64(state.GetNonce(a.address)), nil
}

func (a *Account) Code(ctx context.Context) (hexutil.Bytes, error) {
	state, err := a.getState(ctx)
	if err != nil {
		return hexutil.Bytes{}, err
	}

	return hexutil.Bytes(state.GetCode(a.address)), nil
}

func (a *Account) Storage(ctx context.Context, args struct{ Slot common.Hash }) (common.Hash, error) {
	state, err := a.getState(ctx)
	if err != nil {
		return common.Hash{}, err
	}

	return state.GetState(a.address, args.Slot), nil
}

// Log represents an individual log message. All arguments are mandatory.
type Log struct {
	backend     *eth.EthAPIBackend
	transaction *Transaction
	log         *types.Log
}

func (l *Log) Transaction(ctx context.Context) *Transaction {
	return l.transaction
}

func (l *Log) Account(ctx context.Context, args BlockNumberArgs) *Account {
	return &Account{
		backend:     l.backend,
		address:     l.log.Address,
		blockNumber: args.Number(),
	}
}

func (l *Log) Index(ctx context.Context) int32 {
	return int32(l.log.Index)
}

func (l *Log) Topics(ctx context.Context) []common.Hash {
	return l.log.Topics
}

func (l *Log) Data(ctx context.Context) hexutil.Bytes {
	return hexutil.Bytes(l.log.Data)
}

134
// Transaction represents an Ethereum transaction.
135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
// backend and hash are mandatory; all others will be fetched when required.
type Transaction struct {
	backend *eth.EthAPIBackend
	hash    common.Hash
	tx      *types.Transaction
	block   *Block
	index   uint64
}

// resolve returns the internal transaction object, fetching it if needed.
func (t *Transaction) resolve(ctx context.Context) (*types.Transaction, error) {
	if t.tx == nil {
		tx, blockHash, _, index := rawdb.ReadTransaction(t.backend.ChainDb(), t.hash)
		if tx != nil {
			t.tx = tx
			t.block = &Block{
151 152 153
				backend:   t.backend,
				hash:      blockHash,
				canonical: unknown,
154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339
			}
			t.index = index
		} else {
			t.tx = t.backend.GetPoolTransaction(t.hash)
		}
	}
	return t.tx, nil
}

func (tx *Transaction) Hash(ctx context.Context) common.Hash {
	return tx.hash
}

func (t *Transaction) InputData(ctx context.Context) (hexutil.Bytes, error) {
	tx, err := t.resolve(ctx)
	if err != nil || tx == nil {
		return hexutil.Bytes{}, err
	}
	return hexutil.Bytes(tx.Data()), nil
}

func (t *Transaction) Gas(ctx context.Context) (hexutil.Uint64, error) {
	tx, err := t.resolve(ctx)
	if err != nil || tx == nil {
		return 0, err
	}
	return hexutil.Uint64(tx.Gas()), nil
}

func (t *Transaction) GasPrice(ctx context.Context) (hexutil.Big, error) {
	tx, err := t.resolve(ctx)
	if err != nil || tx == nil {
		return hexutil.Big{}, err
	}
	return hexutil.Big(*tx.GasPrice()), nil
}

func (t *Transaction) Value(ctx context.Context) (hexutil.Big, error) {
	tx, err := t.resolve(ctx)
	if err != nil || tx == nil {
		return hexutil.Big{}, err
	}
	return hexutil.Big(*tx.Value()), nil
}

func (t *Transaction) Nonce(ctx context.Context) (hexutil.Uint64, error) {
	tx, err := t.resolve(ctx)
	if err != nil || tx == nil {
		return 0, err
	}
	return hexutil.Uint64(tx.Nonce()), nil
}

func (t *Transaction) To(ctx context.Context, args BlockNumberArgs) (*Account, error) {
	tx, err := t.resolve(ctx)
	if err != nil || tx == nil {
		return nil, err
	}

	to := tx.To()
	if to == nil {
		return nil, nil
	}

	return &Account{
		backend:     t.backend,
		address:     *to,
		blockNumber: args.Number(),
	}, nil
}

func (t *Transaction) From(ctx context.Context, args BlockNumberArgs) (*Account, error) {
	tx, err := t.resolve(ctx)
	if err != nil || tx == nil {
		return nil, err
	}

	var signer types.Signer = types.FrontierSigner{}
	if tx.Protected() {
		signer = types.NewEIP155Signer(tx.ChainId())
	}
	from, _ := types.Sender(signer, tx)

	return &Account{
		backend:     t.backend,
		address:     from,
		blockNumber: args.Number(),
	}, nil
}

func (t *Transaction) Block(ctx context.Context) (*Block, error) {
	if _, err := t.resolve(ctx); err != nil {
		return nil, err
	}
	return t.block, nil
}

func (t *Transaction) Index(ctx context.Context) (*int32, error) {
	if _, err := t.resolve(ctx); err != nil {
		return nil, err
	}
	if t.block == nil {
		return nil, nil
	}
	index := int32(t.index)
	return &index, nil
}

// getReceipt returns the receipt associated with this transaction, if any.
func (t *Transaction) getReceipt(ctx context.Context) (*types.Receipt, error) {
	if _, err := t.resolve(ctx); err != nil {
		return nil, err
	}

	if t.block == nil {
		return nil, nil
	}

	receipts, err := t.block.resolveReceipts(ctx)
	if err != nil {
		return nil, err
	}

	return receipts[t.index], nil
}

func (t *Transaction) Status(ctx context.Context) (*hexutil.Uint64, error) {
	receipt, err := t.getReceipt(ctx)
	if err != nil || receipt == nil {
		return nil, err
	}

	ret := hexutil.Uint64(receipt.Status)
	return &ret, nil
}

func (t *Transaction) GasUsed(ctx context.Context) (*hexutil.Uint64, error) {
	receipt, err := t.getReceipt(ctx)
	if err != nil || receipt == nil {
		return nil, err
	}

	ret := hexutil.Uint64(receipt.GasUsed)
	return &ret, nil
}

func (t *Transaction) CumulativeGasUsed(ctx context.Context) (*hexutil.Uint64, error) {
	receipt, err := t.getReceipt(ctx)
	if err != nil || receipt == nil {
		return nil, err
	}

	ret := hexutil.Uint64(receipt.CumulativeGasUsed)
	return &ret, nil
}

func (t *Transaction) CreatedContract(ctx context.Context, args BlockNumberArgs) (*Account, error) {
	receipt, err := t.getReceipt(ctx)
	if err != nil || receipt == nil || receipt.ContractAddress == (common.Address{}) {
		return nil, err
	}

	return &Account{
		backend:     t.backend,
		address:     receipt.ContractAddress,
		blockNumber: args.Number(),
	}, nil
}

func (t *Transaction) Logs(ctx context.Context) (*[]*Log, error) {
	receipt, err := t.getReceipt(ctx)
	if err != nil || receipt == nil {
		return nil, err
	}

	ret := make([]*Log, 0, len(receipt.Logs))
	for _, log := range receipt.Logs {
		ret = append(ret, &Log{
			backend:     t.backend,
			transaction: t,
			log:         log,
		})
	}
	return &ret, nil
}

340 341 342 343 344 345 346 347 348
type BlockType int

const (
	unknown BlockType = iota
	isCanonical
	notCanonical
)

// Block represents an Ethereum block.
349 350 351
// backend, and either num or hash are mandatory. All other fields are lazily fetched
// when required.
type Block struct {
352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
	backend   *eth.EthAPIBackend
	num       *rpc.BlockNumber
	hash      common.Hash
	header    *types.Header
	block     *types.Block
	receipts  []*types.Receipt
	canonical BlockType // Indicates if this block is on the main chain or not.
}

func (b *Block) onMainChain(ctx context.Context) error {
	if b.canonical == unknown {
		header, err := b.resolveHeader(ctx)
		if err != nil {
			return err
		}
		canonHeader, err := b.backend.HeaderByNumber(ctx, rpc.BlockNumber(header.Number.Uint64()))
		if err != nil {
			return err
		}
		if header.Hash() == canonHeader.Hash() {
			b.canonical = isCanonical
		} else {
			b.canonical = notCanonical
		}
	}
	if b.canonical != isCanonical {
		return OnlyOnMainChainError
	}
	return nil
381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405
}

// resolve returns the internal Block object representing this block, fetching
// it if necessary.
func (b *Block) resolve(ctx context.Context) (*types.Block, error) {
	if b.block != nil {
		return b.block, nil
	}

	var err error
	if b.hash != (common.Hash{}) {
		b.block, err = b.backend.GetBlock(ctx, b.hash)
	} else {
		b.block, err = b.backend.BlockByNumber(ctx, *b.num)
	}
	if b.block != nil {
		b.header = b.block.Header()
	}
	return b.block, err
}

// resolveHeader returns the internal Header object for this block, fetching it
// if necessary. Call this function instead of `resolve` unless you need the
// additional data (transactions and uncles).
func (b *Block) resolveHeader(ctx context.Context) (*types.Header, error) {
406 407 408 409
	if b.num == nil && b.hash == (common.Hash{}) {
		return nil, BlockInvariantError
	}

410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489
	if b.header == nil {
		if _, err := b.resolve(ctx); err != nil {
			return nil, err
		}
	}
	return b.header, nil
}

// resolveReceipts returns the list of receipts for this block, fetching them
// if necessary.
func (b *Block) resolveReceipts(ctx context.Context) ([]*types.Receipt, error) {
	if b.receipts == nil {
		hash := b.hash
		if hash == (common.Hash{}) {
			header, err := b.resolveHeader(ctx)
			if err != nil {
				return nil, err
			}
			hash = header.Hash()
		}

		receipts, err := b.backend.GetReceipts(ctx, hash)
		if err != nil {
			return nil, err
		}
		b.receipts = []*types.Receipt(receipts)
	}
	return b.receipts, nil
}

func (b *Block) Number(ctx context.Context) (hexutil.Uint64, error) {
	if b.num == nil || *b.num == rpc.LatestBlockNumber {
		header, err := b.resolveHeader(ctx)
		if err != nil {
			return 0, err
		}
		num := rpc.BlockNumber(header.Number.Uint64())
		b.num = &num
	}
	return hexutil.Uint64(*b.num), nil
}

func (b *Block) Hash(ctx context.Context) (common.Hash, error) {
	if b.hash == (common.Hash{}) {
		header, err := b.resolveHeader(ctx)
		if err != nil {
			return common.Hash{}, err
		}
		b.hash = header.Hash()
	}
	return b.hash, nil
}

func (b *Block) GasLimit(ctx context.Context) (hexutil.Uint64, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return 0, err
	}
	return hexutil.Uint64(header.GasLimit), nil
}

func (b *Block) GasUsed(ctx context.Context) (hexutil.Uint64, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return 0, err
	}
	return hexutil.Uint64(header.GasUsed), nil
}

func (b *Block) Parent(ctx context.Context) (*Block, error) {
	// If the block hasn't been fetched, and we'll need it, fetch it.
	if b.num == nil && b.hash != (common.Hash{}) && b.header == nil {
		if _, err := b.resolve(ctx); err != nil {
			return nil, err
		}
	}

	if b.header != nil && b.block.NumberU64() > 0 {
		num := rpc.BlockNumber(b.header.Number.Uint64() - 1)
		return &Block{
490 491 492 493
			backend:   b.backend,
			num:       &num,
			hash:      b.header.ParentHash,
			canonical: unknown,
494
		}, nil
495 496
	}
	if b.num != nil && *b.num != 0 {
497 498
		num := *b.num - 1
		return &Block{
499 500 501
			backend:   b.backend,
			num:       &num,
			canonical: isCanonical,
502 503 504 505 506 507 508 509 510 511 512 513 514
		}, nil
	}
	return nil, nil
}

func (b *Block) Difficulty(ctx context.Context) (hexutil.Big, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return hexutil.Big{}, err
	}
	return hexutil.Big(*header.Difficulty), nil
}

515
func (b *Block) Timestamp(ctx context.Context) (hexutil.Uint64, error) {
516 517
	header, err := b.resolveHeader(ctx)
	if err != nil {
518
		return 0, err
519
	}
520
	return hexutil.Uint64(header.Time), nil
521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589
}

func (b *Block) Nonce(ctx context.Context) (hexutil.Bytes, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return hexutil.Bytes{}, err
	}
	return hexutil.Bytes(header.Nonce[:]), nil
}

func (b *Block) MixHash(ctx context.Context) (common.Hash, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return common.Hash{}, err
	}
	return header.MixDigest, nil
}

func (b *Block) TransactionsRoot(ctx context.Context) (common.Hash, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return common.Hash{}, err
	}
	return header.TxHash, nil
}

func (b *Block) StateRoot(ctx context.Context) (common.Hash, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return common.Hash{}, err
	}
	return header.Root, nil
}

func (b *Block) ReceiptsRoot(ctx context.Context) (common.Hash, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return common.Hash{}, err
	}
	return header.ReceiptHash, nil
}

func (b *Block) OmmerHash(ctx context.Context) (common.Hash, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return common.Hash{}, err
	}
	return header.UncleHash, nil
}

func (b *Block) OmmerCount(ctx context.Context) (*int32, error) {
	block, err := b.resolve(ctx)
	if err != nil || block == nil {
		return nil, err
	}
	count := int32(len(block.Uncles()))
	return &count, err
}

func (b *Block) Ommers(ctx context.Context) (*[]*Block, error) {
	block, err := b.resolve(ctx)
	if err != nil || block == nil {
		return nil, err
	}

	ret := make([]*Block, 0, len(block.Uncles()))
	for _, uncle := range block.Uncles() {
		blockNumber := rpc.BlockNumber(uncle.Number.Uint64())
		ret = append(ret, &Block{
590 591 592 593 594
			backend:   b.backend,
			num:       &blockNumber,
			hash:      uncle.Hash(),
			header:    uncle,
			canonical: notCanonical,
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
		})
	}
	return &ret, nil
}

func (b *Block) ExtraData(ctx context.Context) (hexutil.Bytes, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return hexutil.Bytes{}, err
	}
	return hexutil.Bytes(header.Extra), nil
}

func (b *Block) LogsBloom(ctx context.Context) (hexutil.Bytes, error) {
	header, err := b.resolveHeader(ctx)
	if err != nil {
		return hexutil.Bytes{}, err
	}
	return hexutil.Bytes(header.Bloom.Bytes()), nil
}

func (b *Block) TotalDifficulty(ctx context.Context) (hexutil.Big, error) {
	h := b.hash
	if h == (common.Hash{}) {
		header, err := b.resolveHeader(ctx)
		if err != nil {
			return hexutil.Big{}, err
		}
		h = header.Hash()
	}

	return hexutil.Big(*b.backend.GetTd(h)), nil
}

// BlockNumberArgs encapsulates arguments to accessors that specify a block number.
type BlockNumberArgs struct {
	Block *hexutil.Uint64
}

// Number returns the provided block number, or rpc.LatestBlockNumber if none
// was provided.
func (a BlockNumberArgs) Number() rpc.BlockNumber {
	if a.Block != nil {
		return rpc.BlockNumber(*a.Block)
	}
	return rpc.LatestBlockNumber
}

func (b *Block) Miner(ctx context.Context, args BlockNumberArgs) (*Account, error) {
	block, err := b.resolve(ctx)
	if err != nil {
		return nil, err
	}

	return &Account{
		backend:     b.backend,
		address:     block.Coinbase(),
		blockNumber: args.Number(),
	}, nil
}

func (b *Block) TransactionCount(ctx context.Context) (*int32, error) {
	block, err := b.resolve(ctx)
	if err != nil || block == nil {
		return nil, err
	}
	count := int32(len(block.Transactions()))
	return &count, err
}

func (b *Block) Transactions(ctx context.Context) (*[]*Transaction, error) {
	block, err := b.resolve(ctx)
	if err != nil || block == nil {
		return nil, err
	}

	ret := make([]*Transaction, 0, len(block.Transactions()))
	for i, tx := range block.Transactions() {
		ret = append(ret, &Transaction{
			backend: b.backend,
			hash:    tx.Hash(),
			tx:      tx,
			block:   b,
			index:   uint64(i),
		})
	}
	return &ret, nil
}

func (b *Block) TransactionAt(ctx context.Context, args struct{ Index int32 }) (*Transaction, error) {
	block, err := b.resolve(ctx)
	if err != nil || block == nil {
		return nil, err
	}

	txes := block.Transactions()
	if args.Index < 0 || int(args.Index) >= len(txes) {
		return nil, nil
	}

	tx := txes[args.Index]
	return &Transaction{
		backend: b.backend,
		hash:    tx.Hash(),
		tx:      tx,
		block:   b,
		index:   uint64(args.Index),
	}, nil
}

func (b *Block) OmmerAt(ctx context.Context, args struct{ Index int32 }) (*Block, error) {
	block, err := b.resolve(ctx)
	if err != nil || block == nil {
		return nil, err
	}

	uncles := block.Uncles()
	if args.Index < 0 || int(args.Index) >= len(uncles) {
		return nil, nil
	}

	uncle := uncles[args.Index]
	blockNumber := rpc.BlockNumber(uncle.Number.Uint64())
	return &Block{
719 720 721 722 723
		backend:   b.backend,
		num:       &blockNumber,
		hash:      uncle.Hash(),
		header:    uncle,
		canonical: notCanonical,
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791
	}, nil
}

// BlockFilterCriteria encapsulates criteria passed to a `logs` accessor inside
// a block.
type BlockFilterCriteria struct {
	Addresses *[]common.Address // restricts matches to events created by specific contracts

	// The Topic list restricts matches to particular event topics. Each event has a list
	// of topics. Topics matches a prefix of that list. An empty element slice matches any
	// topic. Non-empty elements represent an alternative that matches any of the
	// contained topics.
	//
	// Examples:
	// {} or nil          matches any topic list
	// {{A}}              matches topic A in first position
	// {{}, {B}}          matches any topic in first position, B in second position
	// {{A}, {B}}         matches topic A in first position, B in second position
	// {{A, B}}, {C, D}}  matches topic (A OR B) in first position, (C OR D) in second position
	Topics *[][]common.Hash
}

// runFilter accepts a filter and executes it, returning all its results as
// `Log` objects.
func runFilter(ctx context.Context, be *eth.EthAPIBackend, filter *filters.Filter) ([]*Log, error) {
	logs, err := filter.Logs(ctx)
	if err != nil || logs == nil {
		return nil, err
	}

	ret := make([]*Log, 0, len(logs))
	for _, log := range logs {
		ret = append(ret, &Log{
			backend:     be,
			transaction: &Transaction{backend: be, hash: log.TxHash},
			log:         log,
		})
	}
	return ret, nil
}

func (b *Block) Logs(ctx context.Context, args struct{ Filter BlockFilterCriteria }) ([]*Log, error) {
	var addresses []common.Address
	if args.Filter.Addresses != nil {
		addresses = *args.Filter.Addresses
	}

	var topics [][]common.Hash
	if args.Filter.Topics != nil {
		topics = *args.Filter.Topics
	}

	hash := b.hash
	if hash == (common.Hash{}) {
		block, err := b.resolve(ctx)
		if err != nil {
			return nil, err
		}
		hash = block.Hash()
	}

	// Construct the range filter
	filter := filters.NewBlockFilter(b.backend, hash, addresses, topics)

	// Run the filter and return all the logs
	return runFilter(ctx, b.backend, filter)
}

792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858
func (b *Block) Account(ctx context.Context, args struct {
	Address common.Address
}) (*Account, error) {
	err := b.onMainChain(ctx)
	if err != nil {
		return nil, err
	}

	if b.num == nil {
		_, err := b.resolveHeader(ctx)
		if err != nil {
			return nil, err
		}
	}

	return &Account{
		backend:     b.backend,
		address:     args.Address,
		blockNumber: *b.num,
	}, nil
}

// CallData encapsulates arguments to `call` or `estimateGas`.
// All arguments are optional.
type CallData struct {
	From     *common.Address // The Ethereum address the call is from.
	To       *common.Address // The Ethereum address the call is to.
	Gas      *hexutil.Uint64 // The amount of gas provided for the call.
	GasPrice *hexutil.Big    // The price of each unit of gas, in wei.
	Value    *hexutil.Big    // The value sent along with the call.
	Data     *hexutil.Bytes  // Any data sent with the call.
}

// CallResult encapsulates the result of an invocation of the `call` accessor.
type CallResult struct {
	data    hexutil.Bytes  // The return data from the call
	gasUsed hexutil.Uint64 // The amount of gas used
	status  hexutil.Uint64 // The return status of the call - 0 for failure or 1 for success.
}

func (c *CallResult) Data() hexutil.Bytes {
	return c.data
}

func (c *CallResult) GasUsed() hexutil.Uint64 {
	return c.gasUsed
}

func (c *CallResult) Status() hexutil.Uint64 {
	return c.status
}

func (b *Block) Call(ctx context.Context, args struct {
	Data ethapi.CallArgs
}) (*CallResult, error) {
	err := b.onMainChain(ctx)
	if err != nil {
		return nil, err
	}

	if b.num == nil {
		_, err := b.resolveHeader(ctx)
		if err != nil {
			return nil, err
		}
	}

859
	result, gas, failed, err := ethapi.DoCall(ctx, b.backend, args.Data, *b.num, vm.Config{}, 5*time.Second, b.backend.RPCGasCap())
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885
	status := hexutil.Uint64(1)
	if failed {
		status = 0
	}
	return &CallResult{
		data:    hexutil.Bytes(result),
		gasUsed: hexutil.Uint64(gas),
		status:  status,
	}, err
}

func (b *Block) EstimateGas(ctx context.Context, args struct {
	Data ethapi.CallArgs
}) (hexutil.Uint64, error) {
	err := b.onMainChain(ctx)
	if err != nil {
		return hexutil.Uint64(0), err
	}

	if b.num == nil {
		_, err := b.resolveHeader(ctx)
		if err != nil {
			return hexutil.Uint64(0), err
		}
	}

886
	gas, err := ethapi.DoEstimateGas(ctx, b.backend, args.Data, *b.num, b.backend.RPCGasCap())
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
	return gas, err
}

type Pending struct {
	backend *eth.EthAPIBackend
}

func (p *Pending) TransactionCount(ctx context.Context) (int32, error) {
	txs, err := p.backend.GetPoolTransactions()
	return int32(len(txs)), err
}

func (p *Pending) Transactions(ctx context.Context) (*[]*Transaction, error) {
	txs, err := p.backend.GetPoolTransactions()
	if err != nil {
		return nil, err
	}

	ret := make([]*Transaction, 0, len(txs))
	for i, tx := range txs {
		ret = append(ret, &Transaction{
			backend: p.backend,
			hash:    tx.Hash(),
			tx:      tx,
			index:   uint64(i),
		})
	}
	return &ret, nil
}

func (p *Pending) Account(ctx context.Context, args struct {
	Address common.Address
}) *Account {
	return &Account{
		backend:     p.backend,
		address:     args.Address,
		blockNumber: rpc.PendingBlockNumber,
	}
}

func (p *Pending) Call(ctx context.Context, args struct {
	Data ethapi.CallArgs
}) (*CallResult, error) {
930
	result, gas, failed, err := ethapi.DoCall(ctx, p.backend, args.Data, rpc.PendingBlockNumber, vm.Config{}, 5*time.Second, p.backend.RPCGasCap())
931 932 933 934 935 936 937 938 939 940 941 942 943 944
	status := hexutil.Uint64(1)
	if failed {
		status = 0
	}
	return &CallResult{
		data:    hexutil.Bytes(result),
		gasUsed: hexutil.Uint64(gas),
		status:  status,
	}, err
}

func (p *Pending) EstimateGas(ctx context.Context, args struct {
	Data ethapi.CallArgs
}) (hexutil.Uint64, error) {
945
	return ethapi.DoEstimateGas(ctx, p.backend, args.Data, rpc.PendingBlockNumber, p.backend.RPCGasCap())
946 947
}

948 949 950 951 952 953 954 955 956 957 958 959 960
// Resolver is the top-level object in the GraphQL hierarchy.
type Resolver struct {
	backend *eth.EthAPIBackend
}

func (r *Resolver) Block(ctx context.Context, args struct {
	Number *hexutil.Uint64
	Hash   *common.Hash
}) (*Block, error) {
	var block *Block
	if args.Number != nil {
		num := rpc.BlockNumber(uint64(*args.Number))
		block = &Block{
961 962 963
			backend:   r.backend,
			num:       &num,
			canonical: isCanonical,
964 965 966
		}
	} else if args.Hash != nil {
		block = &Block{
967 968 969
			backend:   r.backend,
			hash:      *args.Hash,
			canonical: unknown,
970 971 972 973
		}
	} else {
		num := rpc.LatestBlockNumber
		block = &Block{
974 975 976
			backend:   r.backend,
			num:       &num,
			canonical: isCanonical,
977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
		}
	}

	// Resolve the block; if it doesn't exist, return nil.
	b, err := block.resolve(ctx)
	if err != nil {
		return nil, err
	} else if b == nil {
		return nil, nil
	}
	return block, nil
}

func (r *Resolver) Blocks(ctx context.Context, args struct {
	From hexutil.Uint64
	To   *hexutil.Uint64
}) ([]*Block, error) {
	from := rpc.BlockNumber(args.From)

	var to rpc.BlockNumber
	if args.To != nil {
		to = rpc.BlockNumber(*args.To)
	} else {
		to = rpc.BlockNumber(r.backend.CurrentBlock().Number().Int64())
	}

	if to < from {
		return []*Block{}, nil
	}

	ret := make([]*Block, 0, to-from+1)
	for i := from; i <= to; i++ {
		num := i
		ret = append(ret, &Block{
1011 1012 1013
			backend:   r.backend,
			num:       &num,
			canonical: isCanonical,
1014 1015 1016 1017 1018
		})
	}
	return ret, nil
}

1019 1020
func (r *Resolver) Pending(ctx context.Context) *Pending {
	return &Pending{r.backend}
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
}

func (r *Resolver) Transaction(ctx context.Context, args struct{ Hash common.Hash }) (*Transaction, error) {
	tx := &Transaction{
		backend: r.backend,
		hash:    args.Hash,
	}

	// Resolve the transaction; if it doesn't exist, return nil.
	t, err := tx.resolve(ctx)
	if err != nil {
		return nil, err
	} else if t == nil {
		return nil, nil
	}
	return tx, nil
}

func (r *Resolver) SendRawTransaction(ctx context.Context, args struct{ Data hexutil.Bytes }) (common.Hash, error) {
	tx := new(types.Transaction)
	if err := rlp.DecodeBytes(args.Data, tx); err != nil {
		return common.Hash{}, err
	}
	hash, err := ethapi.SubmitTransaction(ctx, r.backend, tx)
	return hash, err
}

1048
// FilterCriteria encapsulates the arguments to `logs` on the root resolver object.
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
type FilterCriteria struct {
	FromBlock *hexutil.Uint64   // beginning of the queried range, nil means genesis block
	ToBlock   *hexutil.Uint64   // end of the range, nil means latest block
	Addresses *[]common.Address // restricts matches to events created by specific contracts

	// The Topic list restricts matches to particular event topics. Each event has a list
	// of topics. Topics matches a prefix of that list. An empty element slice matches any
	// topic. Non-empty elements represent an alternative that matches any of the
	// contained topics.
	//
	// Examples:
	// {} or nil          matches any topic list
	// {{A}}              matches topic A in first position
	// {{}, {B}}          matches any topic in first position, B in second position
	// {{A}, {B}}         matches topic A in first position, B in second position
	// {{A, B}}, {C, D}}  matches topic (A OR B) in first position, (C OR D) in second position
	Topics *[][]common.Hash
}

func (r *Resolver) Logs(ctx context.Context, args struct{ Filter FilterCriteria }) ([]*Log, error) {
	// Convert the RPC block numbers into internal representations
	begin := rpc.LatestBlockNumber.Int64()
	if args.Filter.FromBlock != nil {
		begin = int64(*args.Filter.FromBlock)
	}
	end := rpc.LatestBlockNumber.Int64()
	if args.Filter.ToBlock != nil {
		end = int64(*args.Filter.ToBlock)
	}

	var addresses []common.Address
	if args.Filter.Addresses != nil {
		addresses = *args.Filter.Addresses
	}

	var topics [][]common.Hash
	if args.Filter.Topics != nil {
		topics = *args.Filter.Topics
	}

	// Construct the range filter
	filter := filters.NewRangeFilter(filters.Backend(r.backend), begin, end, addresses, topics)

	return runFilter(ctx, r.backend, filter)
}

func (r *Resolver) GasPrice(ctx context.Context) (hexutil.Big, error) {
	price, err := r.backend.SuggestPrice(ctx)
	return hexutil.Big(*price), err
}

func (r *Resolver) ProtocolVersion(ctx context.Context) (int32, error) {
	return int32(r.backend.ProtocolVersion()), nil
}

// SyncState represents the synchronisation status returned from the `syncing` accessor.
type SyncState struct {
	progress ethereum.SyncProgress
}

func (s *SyncState) StartingBlock() hexutil.Uint64 {
	return hexutil.Uint64(s.progress.StartingBlock)
}

func (s *SyncState) CurrentBlock() hexutil.Uint64 {
	return hexutil.Uint64(s.progress.CurrentBlock)
}

func (s *SyncState) HighestBlock() hexutil.Uint64 {
	return hexutil.Uint64(s.progress.HighestBlock)
}

func (s *SyncState) PulledStates() *hexutil.Uint64 {
	ret := hexutil.Uint64(s.progress.PulledStates)
	return &ret
}

func (s *SyncState) KnownStates() *hexutil.Uint64 {
	ret := hexutil.Uint64(s.progress.KnownStates)
	return &ret
}

// Syncing returns false in case the node is currently not syncing with the network. It can be up to date or has not
// yet received the latest block headers from its pears. In case it is synchronizing:
// - startingBlock: block number this node started to synchronise from
// - currentBlock:  block number this node is currently importing
// - highestBlock:  block number of the highest block header this node has received from peers
// - pulledStates:  number of state entries processed until now
// - knownStates:   number of known state entries that still need to be pulled
func (r *Resolver) Syncing() (*SyncState, error) {
	progress := r.backend.Downloader().Progress()

	// Return not syncing if the synchronisation already completed
	if progress.CurrentBlock >= progress.HighestBlock {
		return nil, nil
	}
	// Otherwise gather the block sync stats
	return &SyncState{progress}, nil
}

// NewHandler returns a new `http.Handler` that will answer GraphQL queries.
// It additionally exports an interactive query browser on the / endpoint.
func NewHandler(be *eth.EthAPIBackend) (http.Handler, error) {
	q := Resolver{be}

	s, err := graphqlgo.ParseSchema(schema, &q)
	if err != nil {
		return nil, err
	}
	h := &relay.Handler{Schema: s}

	mux := http.NewServeMux()
	mux.Handle("/", GraphiQL{})
	mux.Handle("/graphql", h)
	mux.Handle("/graphql/", h)
	return mux, nil
}

// Service encapsulates a GraphQL service.
type Service struct {
	endpoint string             // The host:port endpoint for this service.
	cors     []string           // Allowed CORS domains
	vhosts   []string           // Recognised vhosts
	timeouts rpc.HTTPTimeouts   // Timeout settings for HTTP requests.
	backend  *eth.EthAPIBackend // The backend that queries will operate onn.
	handler  http.Handler       // The `http.Handler` used to answer queries.
	listener net.Listener       // The listening socket.
}

// Protocols returns the list of protocols exported by this service.
func (s *Service) Protocols() []p2p.Protocol { return nil }

// APIs returns the list of APIs exported by this service.
func (s *Service) APIs() []rpc.API { return nil }

// Start is called after all services have been constructed and the networking
// layer was also initialized to spawn any goroutines required by the service.
func (s *Service) Start(server *p2p.Server) error {
	var err error
	s.handler, err = NewHandler(s.backend)
	if err != nil {
		return err
	}

	if s.listener, err = net.Listen("tcp", s.endpoint); err != nil {
		return err
	}

	go rpc.NewHTTPServer(s.cors, s.vhosts, s.timeouts, s.handler).Serve(s.listener)
	log.Info("GraphQL endpoint opened", "url", fmt.Sprintf("http://%s", s.endpoint))
	return nil
}

// Stop terminates all goroutines belonging to the service, blocking until they
// are all terminated.
func (s *Service) Stop() error {
	if s.listener != nil {
		s.listener.Close()
		s.listener = nil
		log.Info("GraphQL endpoint closed", "url", fmt.Sprintf("http://%s", s.endpoint))
	}
	return nil
}

// NewService constructs a new service instance.
func NewService(backend *eth.EthAPIBackend, endpoint string, cors, vhosts []string, timeouts rpc.HTTPTimeouts) (*Service, error) {
	return &Service{
		endpoint: endpoint,
		cors:     cors,
		vhosts:   vhosts,
		timeouts: timeouts,
		backend:  backend,
	}, nil
}

// RegisterGraphQLService is a utility function to construct a new service and register it against a node.
func RegisterGraphQLService(stack *node.Node, endpoint string, cors, vhosts []string, timeouts rpc.HTTPTimeouts) error {
	return stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
		var ethereum *eth.Ethereum
		if err := ctx.Service(&ethereum); err != nil {
			return nil, err
		}
		return NewService(ethereum.APIBackend, endpoint, cors, vhosts, timeouts)
	})
}