rtsp_runtime/
error.rs

1//! Error types for the RTSP session engine.
2//!
3//! Structured [`thiserror`] errors covering the failure surface of the sans-IO
4//! engine: RTSP message parse/serialize, state-machine violations (RFC 2326
5//! Appendix A — see `docs/state-machines.md`),
6//! CSeq correlation, missing/invalid `Session`, `Transport` header parsing
7//! (§12.39 — `docs/transport-header.md`),
8//! interleaved framing (§10.12 — `docs/interleaved-framing.md`),
9//! and authentication (§14 — `docs/auth.md`).
10
11use crate::Method;
12use crate::state::SessionState;
13
14/// Result alias for the engine's fallible operations.
15pub type Result<T> = core::result::Result<T, Error>;
16
17/// Errors produced by the RTSP session engine.
18#[non_exhaustive]
19#[derive(Debug, thiserror::Error)]
20pub enum Error {
21    /// The RTSP message could not be parsed by the underlying `rtsp-types` codec.
22    #[error("failed to parse RTSP message: {0}")]
23    MessageParse(String),
24
25    /// The RTSP message could not be serialized by the underlying codec.
26    #[error("failed to serialize RTSP message: {0}")]
27    MessageWrite(String),
28
29    /// A method was invoked (client) or received (server) that is not permitted
30    /// in the current session state. The server maps this to `455 Method Not
31    /// Valid In This State` (RFC 2326 §11.3.6, Appendix A).
32    #[error("method {method:?} not valid in state {state:?}")]
33    MethodNotValidInState {
34        /// The offending method.
35        method: Method,
36        /// The state the object was in when the method was attempted.
37        state: SessionState,
38    },
39
40    /// A response arrived carrying a `CSeq` that does not match any outstanding
41    /// request.
42    #[error("no pending request for CSeq {0}")]
43    UnknownCSeq(u32),
44
45    /// A response arrived with no parseable `CSeq` header.
46    #[error("response is missing a CSeq header")]
47    MissingCSeq,
48
49    /// An operation required an established session id but none was negotiated
50    /// (no SETUP response has been processed yet).
51    #[error("no session established (SETUP not completed)")]
52    MissingSession,
53
54    /// The `Transport` header value could not be parsed per RFC 2326 §12.39.
55    #[error("invalid Transport header: {0}")]
56    TransportParse(String),
57
58    /// A header value could not be serialized safely (control character in a value,
59    /// or a name that is not an RFC 2326 §15.1 token / session-id character).
60    #[error("cannot serialize header: {0}")]
61    HeaderSerialize(String),
62
63    /// The `Session` header value could not be parsed per RFC 2326 §12.37.
64    #[error("invalid Session header: {0}")]
65    SessionParse(String),
66
67    /// An interleaved `$` frame was malformed (RFC 2326 §10.12).
68    #[error("invalid interleaved frame: {0}")]
69    InterleavedFrame(String),
70
71    /// Authentication failed: no credentials were configured, the challenge
72    /// could not be parsed, or the digest computation failed (RFC 2326 §14).
73    #[error("authentication failure: {0}")]
74    Auth(String),
75
76    /// The request required a request URI but none was set.
77    #[error("request URI required but not set")]
78    MissingRequestUri,
79
80    /// A socket IO operation failed in the async adapter (feature `tokio`).
81    #[error("socket IO error: {0}")]
82    Io(String),
83
84    /// A bounded wait in the async adapter expired (feature `tokio`).
85    #[error("timed out waiting for {what}")]
86    Timeout {
87        /// Which bounded wait expired: `"connect"`, `"handshake"`, `"read"` or `"write"`.
88        what: &'static str,
89    },
90
91    /// A TLS operation failed in the async adapter (feature `tls`): bad server
92    /// name, handshake, or certificate configuration (`rtsps://`, RFC 2326 §19).
93    #[error("TLS error: {0}")]
94    Tls(String),
95
96    /// The server answered `454 Session Not Found` (RFC 2326 §11.3.2) to a
97    /// request on our session — the session is gone (timed out, or torn down
98    /// server-side), so the caller must re-`SETUP`. Surfaced by the send-only
99    /// push drain (a `GET_PARAMETER` keepalive is the usual trigger) instead
100    /// of being silently discarded.
101    #[error("RTSP session not found (454 {method:?}): the session is gone; re-SETUP")]
102    SessionNotFound {
103        /// The method whose request the server rejected with 454.
104        method: Method,
105    },
106}
107
108impl From<std::io::Error> for Error {
109    fn from(e: std::io::Error) -> Self {
110        Error::Io(e.to_string())
111    }
112}
rtsp_runtime/error.rs

rtsp_runtime/
error.rs
