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Disconnect on WebSockets ping
smartcontractkit
Go
### System Information
- Network (Main net, Ropsten, etc.): Ropsten
- Ethereum client (Geth/Parity) and version: Geth v1.8.17-unstable-bd1f7ebd
- Go version: 1.11
- Host OS: macOS 10
- Commit (INFO line when starting the node): 0fa8c72aaf01717ddd8207b4b72715da09eb14d6
### Environment Variables
```
LOG_LEVEL: debug
ROOT: /chainlink
CHAINLINK_PORT: 6688
CHAINLINK_TLS_PORT: 6689
CHAINLINK_TLS_HOST:
ETH_URL: ws://host.docker.internal:4000/
ETH_CHAIN_ID: 3
CLIENT_NODE_URL: http://localhost:6688
TX_MIN_CONFIRMATIONS: 2
TASK_MIN_CONFIRMATIONS: 0
ETH_GAS_BUMP_THRESHOLD: 12
ETH_GAS_BUMP_WEI: 5000000000
ETH_GAS_PRICE_DEFAULT: 20000000000
LINK_CONTRACT_ADDRESS: 0x20fe562d797a42dcb3399062ae9546cd06f63280
MINIMUM_CONTRACT_PAYMENT: 1.000000000000000000
ORACLE_CONTRACT_ADDRESS:
DATABASE_POLL_INTERVAL: 500ms
ALLOW_ORIGINS: *
CHAINLINK_DEV: true
SESSION_TIMEOUT: 15m0s
REAPER_EXPIRATION: 240h0m0s
```
### Additional Information
This needs to be tested with a WS server that can send keep-alive or pure WS pings.
ChainLink will disconnect from WS with `Error in new head subscription, disconnected` if it receives a ping over websockets (see full error below). It will attempt to reconnect, but will constantly close the connection. It sends close reason `1006` / "closed abnormally".
To recreate, set up a geth ws proxy and send a WS ping or keep-alive ping. From my experience, the CL node will respond with a pong, but then instantly close the connection.
Full error given when ping is sent:
```
2018-10-03T09:16:51Z [ERROR] Error in new head subscription, disconnected services/head_tracker.go:186 err=write tcp 172.17.0.3:48322->192.168.65.2:4000: i/o timeout stacktrace=github.com/smartcontractkit/chainlink/logger.Errorw
/go/src/github.com/smartcontractkit/chainlink/logger/logger.go:107
github.com/smartcontractkit/chainlink/services.(*HeadTracker).subscribeToNewHeads.func1
/go/src/github.com/smartcontractkit/chainlink/services/head_tracker.go:186
2018-10-03T09:16:51Z [INFO] Reconnecting to node ws://host.docker.internal:4000/ in 1s services/head_tracker.go:237
2018-10-03T09:16:52Z [ERROR] Error reconnecting to ws://host.docker.internal:4000/ services/head_tracker.go:241 err=write tcp 172.17.0.3:48322->192.168.65.2:4000: i/o timeout stacktrace=github.com/smartcontractkit/chainlink/logger.Errorw
/go/src/github.com/smartcontractkit/chainlink/logger/logger.go:107
github.com/smartcontractkit/chainlink/services.(*HeadTracker).reconnectLoop
/go/src/github.com/smartcontractkit/chainlink/services/head_tracker.go:241
github.com/smartcontractkit/chainlink/services.(*HeadTracker).subscribeToNewHeads.func1
/go/src/github.com/smartcontractkit/chainlink/services/head_tracker.go:187
```
Here's a PoC for the ws proxy in NodeJS: https://gist.github.com/boxhock/c71dcb7f036a3d35dc4adfde05c79e0e
This will fail by default because `keepalive: false` is commented out (timeout is 20s). It will also fail if you uncomment the ping function.
Just for reference, ping and pong will send the `0x9` and `0xA` opcodes.
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