Emcee

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import Foundation
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public enum RequestSenderError: Error, CustomStringConvertible {
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    case noData
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    case unexpectedResponse(Data)
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    case communicationError(Error)
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    case parseError(Error, Data)
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    case sessionIsClosed(URL)
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    case cannotIssueRequest(Error)
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    case credentialsNotUTF8
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    case badStatusCode(Int, body: Data?)
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    public var description: String {
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        switch self {
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        case .noData:
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            return "Unexpected response: No data received"
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        case .unexpectedResponse(let data):
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            let string = String(data: data, encoding: .utf8) ?? "\(data.count) bytes"
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            return "Unexpected response: \(string)"
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        case .communicationError(let underlyingError):
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            return "Response had an error: \(underlyingError)"
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        case .parseError(let error, let data):
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            let string = String(data: data, encoding: .utf8) ?? "\(data.count) bytes"
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            return "Failed to parse response: \(error). Data: \(string)"
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        case .sessionIsClosed(let url):
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            return "Cannot send request to '\(url)' because session is closed"
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        case .cannotIssueRequest(let error):
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            return "Failed to issue request: \(error)"
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        case .credentialsNotUTF8:
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            return "Use UTF8 ecnoding for request credentials"
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        case .badStatusCode(let code, let body):
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            if let body = body, let bodyString = String(data: body, encoding: .utf8) {
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                return "Bad status code \(code), body: \(bodyString)"
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            }
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            return "Bad status code: \(code)"
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        }
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    }
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}
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