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nonce.go
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nonce.go
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// Copyright © 2022 Weald Technology Trading
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package conn
import (
"context"
"fmt"
"strconv"
"github.com/ethereum/go-ethereum/common"
"github.com/pkg/errors"
"github.com/spf13/viper"
)
// CurrentNonce provides the current nonce for the given address.
func (c *Conn) CurrentNonce(ctx context.Context,
address common.Address,
) (
uint64,
error,
) {
c.noncesMu.Lock()
defer c.noncesMu.Unlock()
return c.currentNonce(ctx, address)
}
// currentNonce obtains the current nonce.
// It assumes that the nonces lock is held.
func (c *Conn) currentNonce(ctx context.Context,
address common.Address,
) (
uint64,
error,
) {
_, exists := c.nonces[address]
if !exists {
if c.client == nil {
// Offline, fetch from supplied value.
tmp := viper.GetString("nonce")
if tmp == "" {
return 0, errors.New("nonce not supplied")
}
nonce, err := strconv.ParseUint(tmp, 10, 64)
if err != nil {
return 0, errors.Wrap(err, "invalid nonce")
}
c.nonces[address] = nonce
} else {
// Fetch from chain.
ctx, cancel := context.WithTimeout(ctx, c.timeout)
defer cancel()
nonce, err := c.client.PendingNonceAt(ctx, address)
if err != nil {
return 0, errors.Wrap(err, fmt.Sprintf("failed to obtain nonce for %s", address.Hex()))
}
c.nonces[address] = nonce
}
}
return c.nonces[address], nil
}
// NextNonce obtains the next nonce for the given address.
func (c *Conn) NextNonce(ctx context.Context,
address common.Address,
) (
uint64,
error,
) {
c.noncesMu.Lock()
defer c.noncesMu.Unlock()
currentNonce, err := c.currentNonce(ctx, address)
if err != nil {
return 0, err
}
currentNonce++
c.nonces[address]++
return currentNonce, nil
}