mutating func sendChannelClose()

in Sources/NIOSSH/Child Channels/ChildChannelStateMachine.swift [390:417]
21 lines of code
7 McCabe index (conditional complexity)

    mutating func sendChannelClose(_ message: SSHMessage.ChannelCloseMessage) throws {
        // We can send channel close at any point after the channel is active.
        switch self.state {
        case .active(channelID: let channelID),
             .halfClosedLocal(channelID: let channelID):
            precondition(message.recipientChannel == channelID.peerChannelID)
            self.state = .closedLocally(channelID: channelID, receivedPeerEOF: false)

        case .halfClosedRemote(channelID: let channelID),
             .quiescent(channelID: let channelID):
            precondition(message.recipientChannel == channelID.peerChannelID)
            self.state = .closedLocally(channelID: channelID, receivedPeerEOF: true)

        case .closedRemotely(channelID: let channelID, sentEOF: _):
            precondition(message.recipientChannel == channelID.peerChannelID)
            self.state = .closed(channelID: channelID)

        case .idle:
            // In the idle state we haven't either sent a channel open or received one. This is not really possible.
            preconditionFailure("Somehow received channel EOF for idle channel")

        case .requestedLocally, .requestedRemotely:
            throw NIOSSHError.protocolViolation(protocolName: "channel", violation: "Sent close before channel was open.")

        case .closedLocally, .closed:
            throw NIOSSHError.protocolViolation(protocolName: "channel", violation: "Sent close on closed channel.")
        }
    }