86 lines
2.4 KiB
Swift
86 lines
2.4 KiB
Swift
import Foundation
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import NIOCore
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/**
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Encapsulates a response from a device.
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*/
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struct DeviceResponse {
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/// Shorthand property for a timeout event.
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static var deviceTimedOut: DeviceResponse {
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.init(event: .deviceTimedOut)
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}
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/// Shorthand property for a disconnected event.
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static var deviceNotConnected: DeviceResponse {
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.init(event: .deviceNotConnected)
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}
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/// Shorthand property for an unexpected socket event.
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static var unexpectedSocketEvent: DeviceResponse {
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.init(event: .unexpectedSocketEvent)
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}
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/// Shorthand property for an invalid message.
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static var invalidMessageData: DeviceResponse {
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.init(event: .invalidMessageData)
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}
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/// Shorthand property for missing body data.
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static var noBodyData: DeviceResponse {
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.init(event: .noBodyData)
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}
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/// Shorthand property for a busy connection
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static var operationInProgress: DeviceResponse {
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.init(event: .operationInProgress)
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}
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/// The response to a key from the server
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let event: MessageResult
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/// The index of the next key to use
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let response: Message?
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/**
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Decode a message from a buffer.
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The buffer must contain `Message.length+1` bytes. The first byte denotes the event type,
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the remaining bytes contain the message.
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- Parameter buffer: The buffer where the message bytes are stored
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*/
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init?(_ buffer: ByteBuffer) {
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guard let byte = buffer.getBytes(at: 0, length: 1) else {
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print("No bytes received from device")
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return nil
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}
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guard let event = MessageResult(rawValue: byte[0]) else {
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print("Unknown response \(byte[0]) received from device")
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return nil
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}
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self.event = event
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guard let data = buffer.getSlice(at: 1, length: Message.length) else {
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self.response = nil
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return
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}
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self.response = Message(decodeFrom: data)
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}
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/**
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Create a response from an event without a message from the device.
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- Parameter event: The response from the device.
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*/
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init(event: MessageResult) {
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self.event = event
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self.response = nil
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}
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/// Get the reponse encoded in bytes.
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var encoded: Data {
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guard let message = response else {
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return Data([event.rawValue])
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}
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return Data([event.rawValue]) + message.encoded
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}
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}
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