resilify_http library

Opt-in package:http integration for resilify.

Pulls in package:http as a transitive dependency. Import only if you intend to use HttpResultHandler. For richer features (interceptors, file transfers) prefer the Dio integration.

Classes

CircuitBreaker

Wraps an unreliable operation with the circuit-breaker resilience pattern: after failureThreshold consecutive failures the breaker "opens" and fast-fails calls for resetTimeout; one probe call is then admitted, and its outcome decides whether the breaker closes or reopens.

Error<T>

The failed variant of a Result.

Failure

An immutable, structured description of why an operation failed.

HttpResultHandler

A thin, opt-in adapter that wraps package:http calls in Result values.

Result<T>

A type-safe representation of an operation that either produced a value of type T (Success) or failed with a Failure (Error).

ResultCache<K, V>

An in-memory cache for Result values with optional TTL expiry.

ResultDeduplicator<K, V>

Ensures only one Future<Result<V>> is in flight per key at any time.

RetryHelper

Static helpers for retrying Result-returning async operations.

Success<T>

The successful variant of a Result.

Enums

CircuitBreakerState

State of a CircuitBreaker.

FailureKind

Categorical tag describing what kind of thing went wrong, independent of any HTTP status code or human-readable message.

FailureType

Structural category of a Failure.

Extensions

FlattenResultX on Result<Result<T>>

Collapses a nested Result into a single layer. If the outer is an Error, it is returned unchanged; otherwise the inner Result is returned.

FutureResultX on Future<Result<T>>

Async helpers on Future<Result<T>>.

FutureToResultX on Future<T>

Bridges a regular Future<T> (which signals failure by throwing) into a Future<Result<T>> without writing Result.tryRunAsync(() => future) at every call site.

ResultAsyncX on Result<T>

Async transformations applied directly to a Result (not a future).

ResultListX on Result<List<T>>

Extensions that operate on the elements inside a successful list result.

ResultX on Result<T>

Synchronous helpers on Result.

StreamResultX on Stream<Result<T>>

Extensions for working with streams of Result values without unwrapping each event manually.

Typedefs

JsonParser<T> = T Function(Object? json)

Decodes an already-decoded JSON value (typically Map<String, dynamic> or List<dynamic>) into a typed model T.

LogCallback = void Function(String line)

Sink for log lines emitted by resilify interceptors and handlers.

Exceptions / Errors

ResultUnwrapException

Thrown by ResultX.getOrThrow when called on an Error.