refactor: TunshellSession ~> TunshellClient

[de-sh]

Closes #

Changes

• Rename TunshellSession to TunshellClient
• Create an error type
• Remove unused _config and echo_stdout
• Refactor code to improve readabilitiy

Why?

For maintainability

Trials Performed

Start a tunshell session from stage:

  2023-08-23T03:55:35.200529Z  INFO uplink::base::mqtt: Action = Action { device_id: None, action_id: "1457", kind: "process", name: "launch_shell", payload: "{\"encryption\":\"JKyD8e86uifeBdJdf6ZuLM\",\"relay\":\"eu.relay.tunshell.com\",\"session\":\"PyqjSk1RBHKax2Soh6OXPG\"}" }

  2023-08-23T03:55:35.200776Z  INFO uplink::base::bridge: Received action: Action { device_id: None, action_id: "1457", kind: "process", name: "launch_shell", payload: "{\"encryption\":\"JKyD8e86uifeBdJdf6ZuLM\",\"relay\":\"eu.relay.tunshell.com\",\"session\":\"PyqjSk1RBHKax2Soh6OXPG\"}" }

  2023-08-23T03:55:35.200918Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "1457", device_id: None, sequence: 0, timestamp: 1692762935200, state: "Received", progress: 0, errors: [], done_response: None }

  2023-08-23T03:55:35.201006Z DEBUG uplink::base::bridge::stream: Sequence number anomaly! [0, 0

  2023-08-23T03:55:35.201043Z TRACE uplink::base::bridge::stream: Flushing stream name: action_status, topic: /tenants/demo/devices/1001/action/status

  2023-08-23T03:55:35.201217Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "1457", device_id: None, sequence: 0, timestamp: 1692762935201, state: "ShellSpawned", progress: 90, errors: [], done_response: None }

  2023-08-23T03:55:35.201201Z TRACE uplink::base::serializer: Data received on stream: action_status; message count = 1; batching latency = 0

  2023-08-23T03:55:35.201279Z DEBUG uplink::base::bridge::stream: Sequence number anomaly! [0, 0

  2023-08-23T03:55:35.201317Z TRACE uplink::base::bridge::stream: Flushing stream name: action_status, topic: /tenants/demo/devices/1001/action/status

  2023-08-23T03:55:35.201331Z DEBUG uplink::base::serializer: publishing on /tenants/demo/devices/1001/action/status with size = 105

  2023-08-23T03:55:35.201394Z TRACE uplink::base::serializer: Data received on stream: action_status; message count = 1; batching latency = 0

  2023-08-23T03:55:35.201421Z DEBUG uplink::base::serializer: publishing on /tenants/demo/devices/1001/action/status with size = 110

  2023-08-23T03:55:35.201551Z DEBUG uplink::base::mqtt: Outgoing = Publish(5)

Connecting to relay server...
  2023-08-23T03:55:35.201643Z DEBUG uplink::base::mqtt: Outgoing = Publish(6)

  2023-08-23T03:55:35.321139Z DEBUG uplink::base::mqtt: Incoming = PubAck(PubAck { pkid: 5 })

  2023-08-23T03:55:35.321175Z DEBUG uplink::base::mqtt: Incoming = PubAck(PubAck { pkid: 6 })

Waiting for peer to join...