tracing API for traceBlock and traceCall
This commit is contained in:
i-norden
parent
f5b4e4dc94
commit
39ddcdc9dc
@ -1007,6 +1007,10 @@ func (diff *StateOverride) Apply(state *ipld_direct_state.StateDB) error {
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}
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}
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}
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// Now finalize the changes. Finalize is normally performed between transactions.
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// By using finalize, the overrides are semantically behaving as
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// if they were created in a transaction just before the tracing occur.
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state.Finalise(false)
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return nil
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}
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407
pkg/eth/tracing.go
Normal file
407
pkg/eth/tracing.go
Normal file
@ -0,0 +1,407 @@
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package eth
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"runtime"
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"sync"
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"time"
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ipld_direct_state "github.com/cerc-io/ipld-eth-statedb/direct_by_leaf"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/consensus"
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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/eth/tracers"
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"github.com/ethereum/go-ethereum/eth/tracers/logger"
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"github.com/ethereum/go-ethereum/ethclient"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/rpc"
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)
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const (
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// defaultTraceTimeout is the amount of time a single transaction can execute
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// by default before being forcefully aborted.
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defaultTraceTimeout = 5 * time.Second
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)
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// TracingAPI is the collection of tracing APIs exposed over the private debugging endpoint.
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type TracingAPI struct {
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backend *Backend
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rpc *rpc.Client
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ethClient *ethclient.Client
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config APIConfig
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}
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// NewTracingAPI creates a new TracingAPI with the provided underlying Backend
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func NewTracingAPI(b *Backend, client *rpc.Client, config APIConfig) (*TracingAPI, error) {
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if b == nil {
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return nil, errors.New("ipld-eth-server must be configured with an ethereum backend")
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}
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if config.ForwardEthCalls && client == nil {
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return nil, errors.New("ipld-eth-server is configured to forward eth_calls to proxy node but no proxy node is configured")
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}
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if config.ForwardGetStorageAt && client == nil {
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return nil, errors.New("ipld-eth-server is configured to forward eth_getStorageAt to proxy node but no proxy node is configured")
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}
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if config.ProxyOnError && client == nil {
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return nil, errors.New("ipld-eth-server is configured to forward all calls to proxy node on errors but no proxy node is configured")
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}
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var ethClient *ethclient.Client
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if client != nil {
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ethClient = ethclient.NewClient(client)
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}
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return &TracingAPI{
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backend: b,
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rpc: client,
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ethClient: ethClient,
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config: config,
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}, nil
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}
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// TraceConfig holds extra parameters to trace functions.
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type TraceConfig struct {
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*logger.Config
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Tracer *string
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Timeout *string
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Reexec *uint64
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// Config specific to given tracer. Note struct logger
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// config are historically embedded in main object.
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TracerConfig json.RawMessage
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}
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// TraceCallConfig is the config for traceCall API. It holds one more
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// field to override the state for tracing.
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type TraceCallConfig struct {
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TraceConfig
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StateOverrides *StateOverride
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BlockOverrides *BlockOverrides
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}
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// TraceCall lets you trace a given eth_call. It collects the structured logs
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// created during the execution of EVM if the given transaction was added on
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// top of the provided block and returns them as a JSON object.
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func (api *TracingAPI) TraceCall(ctx context.Context, args TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, config *TraceCallConfig) (interface{}, error) {
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// Try to retrieve the specified block
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var (
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err error
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block *types.Block
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)
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if hash, ok := blockNrOrHash.Hash(); ok {
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block, err = api.blockByHash(ctx, hash)
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} else if number, ok := blockNrOrHash.Number(); ok {
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if number == rpc.PendingBlockNumber {
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// We don't have access to the miner here. For tracing 'future' transactions,
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// it can be done with block- and state-overrides instead, which offers
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// more flexibility and stability than trying to trace on 'pending', since
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// the contents of 'pending' is unstable and probably not a true representation
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// of what the next actual block is likely to contain.
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return nil, errors.New("tracing on top of pending is not supported")
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}
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block, err = api.blockByNumber(ctx, number)
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} else {
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return nil, errors.New("invalid arguments; neither block nor hash specified")
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}
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if err != nil {
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return nil, err
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}
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stateDB, _, err := api.backend.IPLDDirectStateDBAndHeaderByNumberOrHash(ctx, rpc.BlockNumberOrHashWithHash(block.Hash(), true))
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if err != nil {
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return nil, err
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}
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vmctx := core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
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// Apply the customization rules if required.
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if config != nil {
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if err := config.StateOverrides.Apply(stateDB); err != nil {
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return nil, err
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}
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config.BlockOverrides.Apply(&vmctx)
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}
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// Execute the trace
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msg, err := args.ToMessage(api.backend.RPCGasCap(), block.BaseFee())
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if err != nil {
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return nil, err
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}
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var traceConfig *TraceConfig
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if config != nil {
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traceConfig = &config.TraceConfig
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}
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return api.traceTx(ctx, msg, new(tracers.Context), vmctx, stateDB, traceConfig)
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}
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// traceTx configures a new tracer according to the provided configuration, and
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// executes the given message in the provided environment. The return value will
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// be tracer dependent.
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func (api *TracingAPI) traceTx(ctx context.Context, message *core.Message, txctx *tracers.Context, vmctx vm.BlockContext, statedb *ipld_direct_state.StateDB, config *TraceConfig) (interface{}, error) {
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var (
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tracer tracers.Tracer
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err error
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timeout = defaultTraceTimeout
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txContext = core.NewEVMTxContext(message)
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)
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if config == nil {
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config = &TraceConfig{}
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}
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// Default tracer is the struct logger
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tracer = logger.NewStructLogger(config.Config)
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if config.Tracer != nil {
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tracer, err = tracers.DefaultDirectory.New(*config.Tracer, txctx, config.TracerConfig)
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if err != nil {
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return nil, err
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}
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}
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vmenv := vm.NewEVM(vmctx, txContext, statedb, api.backend.ChainConfig(), vm.Config{Tracer: tracer, NoBaseFee: true})
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// Define a meaningful timeout of a single transaction trace
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if config.Timeout != nil {
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if timeout, err = time.ParseDuration(*config.Timeout); err != nil {
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return nil, err
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}
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}
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deadlineCtx, cancel := context.WithTimeout(ctx, timeout)
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go func() {
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<-deadlineCtx.Done()
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if errors.Is(deadlineCtx.Err(), context.DeadlineExceeded) {
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tracer.Stop(errors.New("execution timeout"))
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// Stop evm execution. Note cancellation is not necessarily immediate.
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vmenv.Cancel()
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}
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}()
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defer cancel()
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// Call Prepare to clear out the statedb access list
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statedb.SetTxContext(txctx.TxHash, txctx.TxIndex)
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if _, err = core.ApplyMessage(vmenv, message, new(core.GasPool).AddGas(message.GasLimit)); err != nil {
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return nil, fmt.Errorf("tracing failed: %w", err)
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}
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return tracer.GetResult()
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}
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// chainContext constructs the context reader which is used by the evm for reading
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// the necessary chain context.
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func (api *TracingAPI) chainContext(ctx context.Context) core.ChainContext {
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return &chainContext{api: api, ctx: ctx}
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}
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// blockByNumber is the wrapper of the chain access function offered by the backend.
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// It will return an error if the block is not found.
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func (api *TracingAPI) blockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error) {
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block, err := api.backend.BlockByNumber(ctx, number)
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if err != nil {
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return nil, err
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}
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if block == nil {
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return nil, fmt.Errorf("block #%d not found", number)
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}
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return block, nil
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}
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// blockByHash is the wrapper of the chain access function offered by the backend.
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// It will return an error if the block is not found.
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func (api *TracingAPI) blockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
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block, err := api.backend.BlockByHash(ctx, hash)
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if err != nil {
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return nil, err
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}
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if block == nil {
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return nil, fmt.Errorf("block %s not found", hash.Hex())
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}
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return block, nil
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}
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// txTraceTask represents a single transaction trace task when an entire block
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// is being traced.
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type txTraceTask struct {
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statedb *ipld_direct_state.StateDB // Intermediate state prepped for tracing
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index int // Transaction offset in the block
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}
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// txTraceResult is the result of a single transaction trace.
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type txTraceResult struct {
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Result interface{} `json:"result,omitempty"` // Trace results produced by the tracer
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Error string `json:"error,omitempty"` // Trace failure produced by the tracer
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}
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// TraceBlock returns the structured logs created during the execution of EVM
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// and returns them as a JSON object.
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func (api *TracingAPI) TraceBlock(ctx context.Context, blob hexutil.Bytes, config *TraceConfig) ([]*txTraceResult, error) {
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block := new(types.Block)
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if err := rlp.Decode(bytes.NewReader(blob), block); err != nil {
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return nil, fmt.Errorf("could not decode block: %v", err)
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}
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return api.traceBlock(ctx, block, config)
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}
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// traceBlock configures a new tracer according to the provided configuration, and
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// executes all the transactions contained within. The return value will be one item
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// per transaction, dependent on the requested tracer.
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func (api *TracingAPI) traceBlock(ctx context.Context, block *types.Block, config *TraceConfig) ([]*txTraceResult, error) {
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if block.NumberU64() == 0 {
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return nil, errors.New("genesis is not traceable")
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}
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stateDB, _, err := api.backend.IPLDDirectStateDBAndHeaderByNumberOrHash(ctx, rpc.BlockNumberOrHashWithHash(block.ParentHash(), true))
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if err != nil {
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return nil, err
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}
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// JS tracers have high overhead. In this case run a parallel
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// process that generates states in one thread and traces txes
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// in separate worker threads.
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if config != nil && config.Tracer != nil && *config.Tracer != "" {
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if isJS := tracers.DefaultDirectory.IsJS(*config.Tracer); isJS {
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return api.traceBlockParallel(ctx, block, stateDB, config)
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}
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}
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// Native tracers have low overhead
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var (
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txs = block.Transactions()
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blockHash = block.Hash()
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is158 = api.backend.ChainConfig().IsEIP158(block.Number())
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blockCtx = core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
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signer = types.MakeSigner(api.backend.ChainConfig(), block.Number())
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results = make([]*txTraceResult, len(txs))
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)
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for i, tx := range txs {
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// Generate the next state snapshot fast without tracing
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msg, _ := core.TransactionToMessage(tx, signer, block.BaseFee())
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txctx := &tracers.Context{
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BlockHash: blockHash,
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BlockNumber: block.Number(),
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TxIndex: i,
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TxHash: tx.Hash(),
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}
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res, err := api.traceTx(ctx, msg, txctx, blockCtx, stateDB, config)
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if err != nil {
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return nil, err
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}
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results[i] = &txTraceResult{Result: res}
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// Finalize the state so any modifications are written to the trie
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// Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
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stateDB.Finalise(is158)
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}
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return results, nil
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}
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// traceBlockParallel is for tracers that have a high overhead (read JS tracers). One thread
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// runs along and executes txes without tracing enabled to generate their prestate.
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// Worker threads take the tasks and the prestate and trace them.
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func (api *TracingAPI) traceBlockParallel(ctx context.Context, block *types.Block, statedb *ipld_direct_state.StateDB, config *TraceConfig) ([]*txTraceResult, error) {
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// Execute all the transaction contained within the block concurrently
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var (
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txs = block.Transactions()
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blockHash = block.Hash()
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blockCtx = core.NewEVMBlockContext(block.Header(), api.chainContext(ctx), nil)
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signer = types.MakeSigner(api.backend.ChainConfig(), block.Number())
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results = make([]*txTraceResult, len(txs))
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pend sync.WaitGroup
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)
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threads := runtime.NumCPU()
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if threads > len(txs) {
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threads = len(txs)
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}
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jobs := make(chan *txTraceTask, threads)
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for th := 0; th < threads; th++ {
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pend.Add(1)
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go func() {
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defer pend.Done()
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// Fetch and execute the next transaction trace tasks
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for task := range jobs {
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msg, _ := core.TransactionToMessage(txs[task.index], signer, block.BaseFee())
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txctx := &tracers.Context{
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BlockHash: blockHash,
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BlockNumber: block.Number(),
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TxIndex: task.index,
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TxHash: txs[task.index].Hash(),
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}
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res, err := api.traceTx(ctx, msg, txctx, blockCtx, task.statedb, config)
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if err != nil {
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results[task.index] = &txTraceResult{Error: err.Error()}
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continue
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}
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results[task.index] = &txTraceResult{Result: res}
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}
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}()
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}
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// Feed the transactions into the tracers and return
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var failed error
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txloop:
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for i, tx := range txs {
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// Send the trace task over for execution
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task := &txTraceTask{statedb: statedb.Copy(), index: i}
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select {
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case <-ctx.Done():
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failed = ctx.Err()
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break txloop
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case jobs <- task:
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}
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// Generate the next state snapshot fast without tracing
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msg, _ := core.TransactionToMessage(tx, signer, block.BaseFee())
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statedb.SetTxContext(tx.Hash(), i)
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vmenv := vm.NewEVM(blockCtx, core.NewEVMTxContext(msg), statedb, api.backend.ChainConfig(), vm.Config{})
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if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(msg.GasLimit)); err != nil {
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failed = err
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break txloop
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}
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// Finalize the state so any modifications are written to the trie
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// Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
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statedb.Finalise(vmenv.ChainConfig().IsEIP158(block.Number()))
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}
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close(jobs)
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pend.Wait()
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// If execution failed in between, abort
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if failed != nil {
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return nil, failed
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}
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return results, nil
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}
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// blockByNumberAndHash is the wrapper of the chain access function offered by
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// the backend. It will return an error if the block is not found.
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//
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// Note this function is friendly for the light client which can only retrieve the
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// historical(before the CHT) header/block by number.
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func (api *TracingAPI) blockByNumberAndHash(ctx context.Context, number rpc.BlockNumber, hash common.Hash) (*types.Block, error) {
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block, err := api.blockByNumber(ctx, number)
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if err != nil {
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return nil, err
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}
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if block.Hash() == hash {
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return block, nil
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}
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return api.blockByHash(ctx, hash)
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}
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type chainContext struct {
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api *TracingAPI
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ctx context.Context
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}
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func (context *chainContext) Engine() consensus.Engine {
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return context.api.backend.Engine()
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}
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func (context *chainContext) GetHeader(hash common.Hash, number uint64) *types.Header {
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header, err := context.api.backend.HeaderByNumber(context.ctx, rpc.BlockNumber(number))
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if err != nil {
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return nil
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}
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if header.Hash() == hash {
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return header
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}
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header, err = context.api.backend.HeaderByHash(context.ctx, hash)
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if err != nil {
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return nil
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}
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return header
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}
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