tracers

Documentation

Overview

Package tracers is a manager for transaction tracing engines.

Index

• func APIs(backend Backend) []rpc.API
• func RegisterLookup(wildcard bool, lookup lookupFunc)
• type API
  • func NewAPI(backend Backend) *API
  • func (api *API) IntermediateRoots(ctx context.Context, hash common.Hash, config *TraceConfig) ([]common.Hash, error)
  • func (api *API) TraceBadBlock(ctx context.Context, hash common.Hash, config *TraceConfig) ([]*txTraceResult, error)
  • func (api *API) TraceBlock(ctx context.Context, blob hexutil.Bytes, config *TraceConfig) ([]*txTraceResult, error)
  • func (api *API) TraceBlockByHash(ctx context.Context, hash common.Hash, config *TraceConfig) ([]*txTraceResult, error)
  • func (api *API) TraceBlockByNumber(ctx context.Context, number rpc.BlockNumber, config *TraceConfig) ([]*txTraceResult, error)
  • func (api *API) TraceCall(ctx context.Context, args ethapi.TransactionArgs, ...) (interface{}, error)
  • func (api *API) TraceChain(ctx context.Context, start, end rpc.BlockNumber, config *TraceConfig) (*rpc.Subscription, error)
  • func (api *API) TraceTransaction(ctx context.Context, hash common.Hash, config *TraceConfig) (interface{}, error)
• type Backend
• type Context
• type StdTraceConfig
• type TraceCallConfig
• type TraceConfig
• type Tracer
  • func New(code string, ctx *Context) (Tracer, error)

Functions

func APIs

func APIs(backend Backend) []rpc.API

APIs return the collection of RPC services the tracer package offers.

func RegisterLookup

func RegisterLookup(wildcard bool, lookup lookupFunc)

RegisterLookup registers a method as a lookup for tracers, meaning that users can invoke a named tracer through that lookup. If 'wildcard' is true, then the lookup will be placed last. This is typically meant for interpreted engines (js) which can evaluate dynamic user-supplied code.

Types

type API

type API struct {
	// contains filtered or unexported fields
}

API is the collection of tracing APIs exposed over the private debugging endpoint.

func NewAPI

func NewAPI(backend Backend) *API

NewAPI creates a new API definition for the tracing methods of the Ethereum service.

func (*API) IntermediateRoots

func (api *API) IntermediateRoots(ctx context.Context, hash common.Hash, config *TraceConfig) ([]common.Hash, error)

IntermediateRoots executes a block (bad- or canon- or side-), and returns a list of intermediate roots: the stateroot after each transaction.

func (*API) TraceBadBlock

func (api *API) TraceBadBlock(ctx context.Context, hash common.Hash, config *TraceConfig) ([]*txTraceResult, error)

TraceBadBlock returns the structured logs created during the execution of EVM against a block pulled from the pool of bad ones and returns them as a JSON object.

func (*API) TraceBlock

func (api *API) TraceBlock(ctx context.Context, blob hexutil.Bytes, config *TraceConfig) ([]*txTraceResult, error)

TraceBlock returns the structured logs created during the execution of EVM and returns them as a JSON object.

func (*API) TraceBlockByHash

func (api *API) TraceBlockByHash(ctx context.Context, hash common.Hash, config *TraceConfig) ([]*txTraceResult, error)

TraceBlockByHash returns the structured logs created during the execution of EVM and returns them as a JSON object.

func (*API) TraceBlockByNumber

func (api *API) TraceBlockByNumber(ctx context.Context, number rpc.BlockNumber, config *TraceConfig) ([]*txTraceResult, error)

TraceBlockByNumber returns the structured logs created during the execution of EVM and returns them as a JSON object.

func (*API) TraceCall

func (api *API) TraceCall(ctx context.Context, args ethapi.TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, config *TraceCallConfig) (interface{}, error)

TraceCall lets you trace a given eth_call. It collects the structured logs created during the execution of EVM if the given transaction was added on top of the provided block and returns them as a JSON object. You can provide -2 as a block number to trace on top of the pending block.

func (*API) TraceChain

func (api *API) TraceChain(ctx context.Context, start, end rpc.BlockNumber, config *TraceConfig) (*rpc.Subscription, error)

TraceChain returns the structured logs created during the execution of EVM between two blocks (excluding start) and returns them as a JSON object.

func (*API) TraceTransaction

func (api *API) TraceTransaction(ctx context.Context, hash common.Hash, config *TraceConfig) (interface{}, error)

TraceTransaction returns the structured logs created during the execution of EVM and returns them as a JSON object.

type Backend

type Backend interface {
	HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error)
	HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error)
	BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)
	BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error)
	BadBlocks() []*types.Block
	GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error)
	RPCGasCap() uint64
	ChainConfig() *params.ChainConfig
	Engine() consensus.Engine
	ChainDb() ethdb.Database
	StateAtBlock(ctx context.Context, block *types.Block, reexec uint64, base *state.StateDB, checkLive bool, preferDisk bool) (*state.StateDB, error)
	StateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, error)
}

Backend interface provides the common API services (that are provided by both full and light clients) with access to necessary functions.

type Context

type Context struct {
	BlockHash common.Hash // Hash of the block the tx is contained within (zero if dangling tx or call)
	TxIndex   int         // Index of the transaction within a block (zero if dangling tx or call)
	TxHash    common.Hash // Hash of the transaction being traced (zero if dangling call)
}

Context contains some contextual infos for a transaction execution that is not available from within the EVM object.

type StdTraceConfig

type StdTraceConfig struct {
	logger.Config
	Reexec *uint64
	TxHash common.Hash
}

StdTraceConfig holds extra parameters to standard-json trace functions.

type TraceCallConfig

type TraceCallConfig struct {
	*logger.Config
	Tracer         *string
	Timeout        *string
	Reexec         *uint64
	StateOverrides *ethapi.StateOverride
}

TraceCallConfig is the config for traceCall API. It holds one more field to override the state for tracing.

type TraceConfig

type TraceConfig struct {
	*logger.Config
	Tracer  *string
	Timeout *string
	Reexec  *uint64
}

TraceConfig holds extra parameters to trace functions.

type Tracer

type Tracer interface {
	vm.EVMLogger
	GetResult() (json.RawMessage, error)
	// Stop terminates execution of the tracer at the first opportune moment.
	Stop(err error)
}

Tracer interface extends vm.EVMLogger and additionally allows collecting the tracing result.

func New

func New(code string, ctx *Context) (Tracer, error)

New returns a new instance of a tracer, by iterating through the registered lookups.