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annotate src/error.rs @ 0:a65053246c29

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author Martin Habovstiak <martin.habovstiak@gmail.com>
date Thu, 26 Nov 2020 22:53:35 +0100
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1 //! Error types that can occur when dealing with `SocketAddr`
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2 //!
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3 //! This module separates the error types from root module to avoid clutter.
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5
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6 use thiserror::Error;
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7 use std::io;
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8
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9 /// Error that can occur during parsing of `SocketAddr` from a string
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10 ///
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11 /// This encapsulates possible errors that can occur when parsing the input.
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12 /// It is currently opaque because the representation is not certain yet.
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13 /// It can be displayed using the standard `Error` trait.
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14 #[derive(Debug, Error)]
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15 #[error(transparent)]
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16 pub struct ParseError(#[from] pub(crate) ParseErrorInner);
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17
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18 #[derive(Debug, Error)]
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19 pub(crate) enum ParseErrorInner {
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20 #[error("failed to parse socket address")]
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21 SocketAddr(std::net::AddrParseError),
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22 #[error("invalid character '{c}' in systemd socket name {string} at position {pos}")]
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23 InvalidCharacter { string: String, c: char, pos: usize, }
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24 }
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25
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26 /// Error that can occur during parsing of `SocketAddr` from a `OsStr`/`OsString`
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27 ///
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28 /// As opposed to parsing from `&str` or `String`, parsing from `OsStr` can fail due to one more
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29 /// reason: invalid UTF-8. This error type expresses this possibility and is returned whenever such
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30 /// conversion is attempted. It is not opaque because the possible variants are pretty much
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31 /// certain, but it may contain `ParseError` which is opaque.
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32 ///
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33 /// This error can be displayed using standard `Error` trait.
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34 /// See `ParseError` for more information.
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35 #[derive(Debug, Error)]
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36 pub enum ParseOsStrError {
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37 /// The input was not a valid UTF-8 string
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38 #[error("the address is not a valid UTF-8 string")]
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39 InvalidUtf8,
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40 /// The input was a valid UTF-8 string but the address was invalid
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41 #[error(transparent)]
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42 InvalidAddress(#[from] ParseError),
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43 }
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44
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45 /// Error that can occur during binding of a socket
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46 ///
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47 /// This encapsulates possible errors that can occur when binding a socket or receiving a socket
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48 /// from systemd.
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49 /// It is currently opaque because the representation is not certain yet.
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50 /// It can be displayed using the standard `Error` trait.
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51 #[derive(Debug, Error)]
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52 #[error(transparent)]
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53 pub struct BindError(#[from] pub(crate) BindErrorInner);
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54
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55 #[derive(Debug, Error)]
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56 pub(crate) enum BindErrorInner {
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57 #[error("failed to bind {addr}")]
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58 BindFailed { addr: std::net::SocketAddr, #[source] error: io::Error, },
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59 #[error("failed to receive descriptors with names")]
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60 ReceiveDescriptors(#[source] crate::systemd_sockets::Error),
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61 #[error("missing systemd socket {0} - a typo or an attempt to bind twice")]
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62 MissingDescriptor(String),
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63 #[error("the systemd socket {0} is not an internet socket")]
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64 NotInetSocket(String),
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65 }
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66
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67 /// Error that can happen when binding Tokio socket.
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68 ///
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69 /// As opposed to `std` and `async_std` sockets, tokio sockets can fail to convert.
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70 /// This error type expresses this possibility.
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71 #[cfg(any(feature = "tokio_0_2", feature = "tokio_0_3"))]
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72 #[derive(Debug, Error)]
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73 #[error(transparent)]
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74 pub enum TokioBindError {
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75 /// Either binding of socket or receiving systemd socket failed
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76 Bind(#[from] BindError),
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77 /// Conversion from std `std::net::TcpListener` to `tokio::net::TcpListener` failed
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78 Convert(#[from] TokioConversionError),
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79 }
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80
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81 /// Error that can happen when converting Tokio socket.
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82 ///
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83 /// As opposed to `std` and `async_std` sockets, tokio sockets can fail to convert.
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84 /// This error type encapsulates conversion error together with additional information so that it
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85 /// can be displayed nicely. The encapsulation also allows for future-proofing.
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86 #[cfg(any(feature = "tokio_0_2", feature = "tokio_0_3"))]
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87 #[derive(Debug, Error)]
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88 #[error("failed to convert std socket {addr} into tokio socket")]
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89 pub struct TokioConversionError {
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90 pub(crate) addr: crate::SocketAddrInner,
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91 #[source]
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92 pub(crate) error: io::Error,
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93 }
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94