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graphql, internal/ethapi: support overriding accounts in eth_call (#19917)

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* graphql, internal/ethapi: extend eth_call

This PR offers the third option parameter for eth_call API.
Caller can specify a batch of contracts for overriding the
original account metadata(nonce, balance, code, state).
It has a few advantages:

* It's friendly for debugging
* It's can make on-chain contract lighter for getting rid of
  state access functions

* core, internal: address comments
This commit is contained in:
gary rong
2019-08-08 21:44:11 +08:00
committed by Péter Szilágyi
parent 081642ed25
commit c9cdf144d5
4 changed files with 99 additions and 8 deletions
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34
core/state/state_object.go
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@ -81,6 +81,7 @@ type stateObject struct {
originStorage Storage // Storage cache of original entries to dedup rewrites
dirtyStorage Storage // Storage entries that need to be flushed to disk
fakeStorage Storage // Fake storage which constructed by caller for debugging purpose.
// Cache flags.
// When an object is marked suicided it will be delete from the trie
@ -163,6 +164,10 @@ func (s *stateObject) getTrie(db Database) Trie {
// GetState retrieves a value from the account storage trie.
func (s *stateObject) GetState(db Database, key common.Hash) common.Hash {
// If the fake storage is set, only lookup the state here(in the debugging mode)
if s.fakeStorage != nil {
return s.fakeStorage[key]
}
// If we have a dirty value for this state entry, return it
value, dirty := s.dirtyStorage[key]
if dirty {
@ -174,12 +179,16 @@ func (s *stateObject) GetState(db Database, key common.Hash) common.Hash {
// GetCommittedState retrieves a value from the committed account storage trie.
func (s *stateObject) GetCommittedState(db Database, key common.Hash) common.Hash {
// If the fake storage is set, only lookup the state here(in the debugging mode)
if s.fakeStorage != nil {
return s.fakeStorage[key]
}
// If we have the original value cached, return that
value, cached := s.originStorage[key]
if cached {
return value
}
// Track the amount of time wasted on reading the storge trie
// Track the amount of time wasted on reading the storage trie
if metrics.EnabledExpensive {
defer func(start time.Time) { s.db.StorageReads += time.Since(start) }(time.Now())
}
@ -202,6 +211,11 @@ func (s *stateObject) GetCommittedState(db Database, key common.Hash) common.Has
// SetState updates a value in account storage.
func (s *stateObject) SetState(db Database, key, value common.Hash) {
// If the fake storage is set, put the temporary state update here.
if s.fakeStorage != nil {
s.fakeStorage[key] = value
return
}
// If the new value is the same as old, don't set
prev := s.GetState(db, key)
if prev == value {
@ -216,6 +230,24 @@ func (s *stateObject) SetState(db Database, key, value common.Hash) {
s.setState(key, value)
}
// SetStorage replaces the entire state storage with the given one.
//
// After this function is called, all original state will be ignored and state
// lookup only happens in the fake state storage.
//
// Note this function should only be used for debugging purpose.
func (s *stateObject) SetStorage(storage map[common.Hash]common.Hash) {
// Allocate fake storage if it's nil.
if s.fakeStorage == nil {
s.fakeStorage = make(Storage)
}
for key, value := range storage {
s.fakeStorage[key] = value
}
// Don't bother journal since this function should only be used for
// debugging and the `fake` storage won't be committed to database.
}
func (s *stateObject) setState(key, value common.Hash) {
s.dirtyStorage[key] = value
}