[shutdown_channel]Non-final channels cannot be shut down.

Bug Report

Current Behavior

Non-final channels cannot be shut down.

{"jsonrpc":"2.0","error":{"code":-32000,"message":"Invalid state: Trying to send shutdown message while in invalid state SigningCommitment(SigningCommitmentFlags(OUR_COMMITMENT_SIGNED_SENT))","data":{"channel_id":"0x4a8005b38889afa484fb0527e85ecaa39c01a8b2020257a58d2feb9f3f1a3d74","close_script":{"code_hash":"0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8","hash_type":"type","args":"0x1731fdaaf19200d0f278a84bfb09de751449e101"},"force":null,"fee_rate":"0x3fc"}},"id":42}Closing channel_id: 0x0bf33a8529b95345e759e47f7978522aa863a5ee99518aac6c6adef0bd055e97
{"jsonrpc":"2.0","error":{"code":-32000,"message":"Invalid state: Trying to send shutdown message while in invalid state CollaboratingFundingTx(CollaboratingFundingTxFlags(AWAITING_REMOTE_TX_COLLABORATION_MSG))","data":{"channel_id":"0x0bf33a8529b95345e759e47f7978522aa863a5ee99518aac6c6adef0bd055e97","close_script":{"code_hash":"0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8","hash_type":"type","args":"0x1731fdaaf19200d0f278a84bfb09de751449e101"},"force":null,"fee_rate":"0x3fc"}},"id":42}Closing channel_id: 0xc3887d17c51a8306e1ca034f3117d4e830de29922c49c8f29718b1e67252a1e8
{"jsonrpc":"2.0","error":{"code":-32000,"message":"Invalid state: Trying to send shutdown message while in invalid state NegotiatingFunding(NegotiatingFundingFlags(OUR_INIT_SENT | THEIR_INIT_SENT))","data":{"channel_id":"0xc3887d17c51a8306e1ca034f3117d4e830de29922c49c8f29718b1e67252a1e8","close_script":{"code_hash":"0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8","hash_type":"type","args":"0x1731fdaaf19200d0f278a84bfb09de751449e101"},"force":null,"fee_rate":"0x3fc"}},"id":42}

Expected Behavior

Non-final channels can be shut down.

Environment

• fiber version: fnn 0.1.0
• Ckb Chain: testnet
• Operating system: Ubuntu 20.04
• Arch: Linux ip-172-31-100-41 6.8.0-1016-aws #17-Ubuntu SMP Mon Sep 2 13:48:07 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
• Installation: Built from source

Additional context/Screenshots

2024-10-25T07:47:36.689055Z ERROR fnn::fiber::channel: Error while processing channel command: InvalidState("Trying to send shutdown message while in invalid state SigningCommitment(SigningCommitmentFlags(OUR_COMMITMENT_SIGNED_SENT))")
    at src/fiber/channel.rs:1599
    in ractor::actor::Actor with id: "0.104", name: "Channel-95 QmbkDSCvXe1f6ofaBcC9TiuNQBGAThzMUpJWduqqfETgkr <-> QmRErF9SRUUb4XdABffAM3yA1pgGdTKnKZrRa5a7bjfB2d"

  2024-10-25T07:47:36.689232Z ERROR fnn::rpc::channel: channel request params ShutdownChannelParams { channel_id: Hash256(0xfc682003f6dcccadf190cb0b76b7e68e1b2a18804aad41d643714a38af5cb9f1), close_script: Script { code_hash: H256 ( [ 0x9b, 0xd7, 0xe0, 0x6f, 0x3e, 0xcf, 0x4b, 0xe0, 0xf2, 0xfc, 0xd2, 0x18, 0x8b, 0x23, 0xf1, 0xb9, 0xfc, 0xc8, 0x8e, 0x5d, 0x4b, 0x65, 0xa8, 0x63, 0x7b, 0x17, 0x72, 0x3b, 0xbd, 0xa3, 0xcc, 0xe8 ] ), hash_type: Type, args: JsonBytes(b"\x171\xfd\xaa\xf1\x92\0\xd0\xf2x\xa8K\xfb\t\xdeu\x14I\xe1\x01") }, force: None, fee_rate: 1020 } => error: "Invalid state: Trying to send shutdown message while in invalid state SigningCommitment(SigningCommitmentFlags(OUR_COMMITMENT_SIGNED_SENT))"
    at src/rpc/channel.rs:453 

Start at the shutdown handling reported in src/fiber/channel.rs:1599 and the RPC entry point at src/rpc/channel.rs:453. Reproduce shutdown requests for channels in the listed SigningCommitment, CollaboratingFundingTx, and NegotiatingFunding states, then trace their state handling. Done means non-final channels can be shut down without the reported InvalidState errors.