Enum StreamError 

pub enum StreamError {
    ConnectionFailed {
        url: String,
        reason: String,
    },
    Disconnected {
        url: String,
    },
    ReconnectExhausted {
        url: String,
        attempts: u32,
    },
    ParseError {
        exchange: String,
        reason: String,
    },
    StaleFeed {
        feed_id: String,
        elapsed_ms: u64,
        threshold_ms: u64,
    },
    BookReconstructionFailed {
        symbol: String,
        reason: String,
    },
    BookCrossed {
        symbol: String,
        bid: String,
        ask: String,
    },
    Backpressure {
        channel: String,
        depth: usize,
        capacity: usize,
    },
    UnknownExchange(String),
    Io(String),
    WebSocket(String),
    RingBufferFull {
        capacity: usize,
    },
    RingBufferEmpty,
    AggregationError {
        reason: String,
    },
    NormalizationError {
        reason: String,
    },
    InvalidTick {
        reason: String,
    },
    LorentzConfigError {
        reason: String,
    },
}

Unified error type for all fin-stream pipeline operations.

Each variant carries enough context to reconstruct the failure site without inspecting internal state. The Display impl is machine-parseable: field values never contain the literal substring used as a delimiter.

Variants

ConnectionFailed

WebSocket connection failed.

Fields

url: String

The WebSocket URL that could not be reached.

reason: String

Human-readable description of the failure.

Disconnected

WebSocket disconnected unexpectedly.

Fields

url: String

The WebSocket URL that was disconnected.

ReconnectExhausted

Reconnection attempts exhausted.

Fields

url: String

The target URL for reconnection.

attempts: u32

Total number of reconnect attempts made.

ParseError

Tick deserialization failed.

Fields

exchange: String

Name of the exchange that sent the unparseable tick.

reason: String

Description of the parse failure.

StaleFeed

Feed is stale – no data received within staleness threshold.

Fields

feed_id: String

Identifier of the stale feed.

elapsed_ms: u64

Milliseconds since the last tick was received.

threshold_ms: u64

Configured staleness threshold in milliseconds.

BookReconstructionFailed

Order book reconstruction failed.

Fields

symbol: String

Symbol whose order book could not be reconstructed.

reason: String

Description of the reconstruction failure.

BookCrossed

Order book is crossed (bid >= ask).

Fields

symbol: String

Symbol with the crossed book.

bid: String

Best bid price as a string.

ask: String

Best ask price as a string.

Backpressure

Backpressure: the downstream channel is full.

Fields

channel: String

Name or URL of the backpressured channel.

depth: usize

Current number of items queued.

capacity: usize

Maximum capacity of the channel.

UnknownExchange(String)

Invalid exchange format.

Io(String)

I/O error.

WebSocket(String)

WebSocket protocol error.

RingBufferFull

SPSC ring buffer is full; the producer must back off or drop the item.

This variant is returned by crate::ring::SpscRing::push when the buffer has no free slots. It never panics.

Fields

capacity: usize

Configured usable capacity of the ring buffer (N - 1 slots).

RingBufferEmpty

SPSC ring buffer is empty; no item is available for the consumer.

This variant is returned by crate::ring::SpscRing::pop when there are no pending items. Callers should retry or park the consumer thread.

AggregationError

An error occurred during OHLCV bar aggregation.

Wraps structural errors such as receiving a tick for the wrong symbol or a timeframe with a zero-duration period.

Fields

reason: String

Description of the aggregation failure.

NormalizationError

An error occurred during coordinate normalization.

Typically indicates that the normalizer received a value outside the expected numeric range, or that the rolling window is not yet seeded.

Fields

reason: String

Description of the normalization failure.

InvalidTick

A tick failed structural validation before entering the pipeline.

Examples: negative price, zero quantity, timestamp in the past beyond the configured tolerance.

Fields

reason: String

Description of the validation failure.

LorentzConfigError

The Lorentz transform configuration is invalid.

The relativistic velocity parameter beta (v/c) must satisfy 0 <= beta < 1. A beta of exactly 1 (or above) would produce a division by zero in the Lorentz factor gamma = 1 / sqrt(1 - beta^2).

Fields

reason: String

Description of the configuration error.

Trait Implementations

impl Debug for StreamError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for StreamError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for StreamError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.