Struct Error

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pub struct Error {
    pub etype: ErrorType,
    pub esource: ErrorSource,
    pub retry: RetryType,
    pub cause: Option<Box<dyn Error + Sync + Send>>,
    pub context: Option<ImmutStr>,
}

Expand description

The struct that represents an error

Fields§

§etype: ErrorType

the type of error

§esource: ErrorSource

the source of error: from upstream, downstream or internal

§retry: RetryType

if the error is retry-able

§cause: Option<Box<dyn Error + Sync + Send>>

chain to the cause of this error

§context: Option<ImmutStr>

an arbitrary string that explains the context when the error happens

Implementations§

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impl Error

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pub fn create( etype: ErrorType, esource: ErrorSource, context: Option<ImmutStr>, cause: Option<Box<dyn Error + Sync + Send>>, ) -> Box<Error>

Simply create the error. See other functions that provide less verbose interfaces.

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pub fn new(e: ErrorType) -> Box<Error>

Create an error with the given type

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pub fn because<S, E>(e: ErrorType, context: S, cause: E) -> Box<Error>
where S: Into<ImmutStr>, E: Into<Box<dyn Error + Sync + Send>>,

Create an error with the given type, a context string and the causing error. This method is usually used when there the error is caused by another error.

use pingora_error::{Error, ErrorType, Result};

fn b() -> Result<()> {
    // ...
    Ok(())
}
fn do_something() -> Result<()> {
    // a()?;
    b().map_err(|e| Error::because(ErrorType::InternalError, "b failed after a", e))
}

Choose carefully between simply surfacing the causing error versus Because() here. Only use Because() when there is extra context that is not capture by the causing error itself.

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pub fn e_because<T, S, E>( e: ErrorType, context: S, cause: E, ) -> Result<T, Box<Error>>
where S: Into<ImmutStr>, E: Into<Box<dyn Error + Sync + Send>>,

Short for Err(Self::because)

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pub fn explain<S>(e: ErrorType, context: S) -> Box<Error>
where S: Into<ImmutStr>,

Create an error with context but no direct causing error

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pub fn e_explain<T, S>(e: ErrorType, context: S) -> Result<T, Box<Error>>
where S: Into<ImmutStr>,

Short for Err(Self::explain)

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pub fn new_up(e: ErrorType) -> Box<Error>

The new_{up, down, in} functions are to create new errors with source {upstream, downstream, internal}

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pub fn new_down(e: ErrorType) -> Box<Error>

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pub fn new_in(e: ErrorType) -> Box<Error>

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pub fn new_str(s: &'static str) -> Box<Error>

Create a new custom error with the static string

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pub fn as_up(&mut self)

The as_{up, down, in} functions are to change the current errors with source {upstream, downstream, internal}

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pub fn as_down(&mut self)

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pub fn as_in(&mut self)

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pub fn into_up(self: Box<Error>) -> Box<Error>

The into_{up, down, in} are the same as as_* but takes self and also return self

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pub fn into_down(self: Box<Error>) -> Box<Error>

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pub fn into_in(self: Box<Error>) -> Box<Error>

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pub fn into_err<T>(self: Box<Error>) -> Result<T, Box<Error>>

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pub fn set_cause<C>(&mut self, cause: C)
where C: Into<Box<dyn Error + Sync + Send>>,

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pub fn set_context<T>(&mut self, context: T)
where T: Into<ImmutStr>,

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pub fn more_context<T>(self: Box<Error>, context: T) -> Box<Error>
where T: Into<ImmutStr>,

Create a new error from self, with the same type and source and put self as the cause

use pingora_error::Result;

 fn b() -> Result<()> {
    // ...
    Ok(())
}

fn do_something() -> Result<()> {
    // a()?;
    b().map_err(|e| e.more_context("b failed after a"))
}

This function is less verbose than Because. But it only work for Error while Because works for all types of errors who implement std::error::Error trait.

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