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Merge pull request #53 from mysteriumnetwork/reconnectable-ethclient
Add reconnactable ethereum client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| * Copyright (C) 2020 The "MysteriumNetwork/payments" Authors. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
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| package client | ||
|
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| import ( | ||
| "fmt" | ||
| "sync" | ||
|
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| "github.com/ethereum/go-ethereum/ethclient" | ||
| ) | ||
|
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| // NewReconnectableEthClient creates new ethereum client that can reconnect. | ||
| func NewReconnectableEthClient(address string) (*ReconnectableEthClient, error) { | ||
| ec, err := ethclient.Dial(address) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("ethereum client failed to connect: %w", err) | ||
| } | ||
|
|
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| return &ReconnectableEthClient{ | ||
| address: address, | ||
| client: ec, | ||
| }, nil | ||
| } | ||
|
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| // ReconnectableEthClient is a ethereum client that can reconnect. | ||
| type ReconnectableEthClient struct { | ||
| address string | ||
| mu sync.Mutex | ||
| client *ethclient.Client | ||
| } | ||
|
|
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| // Client returns the currently connected ethereum client. | ||
| func (c *ReconnectableEthClient) Client() *ethclient.Client { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
|
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| return c.client | ||
| } | ||
|
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| // Reconnect creates new ethereum client and replaces the current one. | ||
| func (c *ReconnectableEthClient) Reconnect() error { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
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| client, err := ethclient.Dial(c.address) | ||
| if err != nil { | ||
| return fmt.Errorf("ethereum client failed to dial: %w", err) | ||
| } | ||
|
|
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| c.client.Close() | ||
| c.client = client | ||
|
|
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| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| /* | ||
| * Copyright (C) 2020 The "MysteriumNetwork/payments" Authors. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| package client | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
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| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
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| func TestReconnectableEthClientCreatesNewClient(t *testing.T) { | ||
| client, err := NewReconnectableEthClient("http://127.0.0.1:1234") | ||
| assert.Nil(t, err) | ||
|
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| c1 := client.Client() | ||
| c2 := client.Client() | ||
| assert.Equal(t, c1, c2) | ||
|
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| err = client.Reconnect() | ||
| assert.Nil(t, err) | ||
|
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| c3 := client.Client() | ||
| assert.NotEqual(t, c1, c3) | ||
| } |