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authorDeterminant <[email protected]>2019-10-21 14:47:51 -0400
committerDeterminant <[email protected]>2019-10-21 14:47:51 -0400
commit79b1169a9ff0b54ddf3b520a70a79c78ba5c988d (patch)
tree13fc62be3ebf344544547eeb9979450a3c6ecd40 /core/gaspool.go
parent913e9439a7c7883881895ee597a0cc464fb92353 (diff)
customize Blockchain code
Diffstat (limited to 'core/gaspool.go')
-rw-r--r--core/gaspool.go54
1 files changed, 54 insertions, 0 deletions
diff --git a/core/gaspool.go b/core/gaspool.go
new file mode 100644
index 0000000..e3795c1
--- /dev/null
+++ b/core/gaspool.go
@@ -0,0 +1,54 @@
+// Copyright 2015 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 core
+
+import (
+ "fmt"
+ "math"
+)
+
+// GasPool tracks the amount of gas available during execution of the transactions
+// in a block. The zero value is a pool with zero gas available.
+type GasPool uint64
+
+// AddGas makes gas available for execution.
+func (gp *GasPool) AddGas(amount uint64) *GasPool {
+ if uint64(*gp) > math.MaxUint64-amount {
+ panic("gas pool pushed above uint64")
+ }
+ *(*uint64)(gp) += amount
+ return gp
+}
+
+// SubGas deducts the given amount from the pool if enough gas is
+// available and returns an error otherwise.
+func (gp *GasPool) SubGas(amount uint64) error {
+ if uint64(*gp) < amount {
+ return ErrGasLimitReached
+ }
+ *(*uint64)(gp) -= amount
+ return nil
+}
+
+// Gas returns the amount of gas remaining in the pool.
+func (gp *GasPool) Gas() uint64 {
+ return uint64(*gp)
+}
+
+func (gp *GasPool) String() string {
+ return fmt.Sprintf("%d", *gp)
+}