Enum Error 

#[non_exhaustive]
pub enum Error {
    Io(Error),
    Json(Error),
    InvalidUsername {
        input: String,
        reason: String,
    },
    InvalidSite {
        reason: String,
    },
    HttpSetup {
        message: String,
    },
    BrowserSetup {
        message: String,
    },
}

Errors produced by the Adler engine.

New variants are added as subsystems land. The enum is #[non_exhaustive] so growth is not a breaking change.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Io(Error)

I/O error while reading or writing local data (sites file, cache, etc.).

Json(Error)

Failed to (de)serialize JSON — typically a site-definitions file.

InvalidUsername

The supplied string is not a valid username.

The original input is preserved so callers can echo it back to the user without re-deriving it from the error message.

Fields

input: String

The string the caller attempted to use as a username.

reason: String

Human-readable failure reason.

InvalidSite

A loaded site definition failed validation (bad template, empty marker, …).

Fields

reason: String

Human-readable failure reason, including the site name when available.

HttpSetup

Building the HTTP client failed (TLS init, bad config, …).

Per-request errors do not surface here — they become MatchKind::Uncertain so a single flaky site can’t abort a full run.

Fields

message: String

Underlying error description (reqwest’s error chain rendered).

BrowserSetup

Constructing a browser backend failed (no local Chrome, bad Browserbase credentials, etc.). Per-fetch browser failures become MatchKind::Uncertain — only setup surfaces here.

Fields

message: String

Underlying error description.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.