Struct LoadBalancerFilter 

pub struct LoadBalancerFilter { /* private fields */ }

Selects an upstream endpoint using the cluster’s configured strategy.

Supported strategies:

• round_robin (default): cycles through endpoints in order, respecting weights via endpoint expansion.
• least_connections: picks the endpoint with the fewest active in-flight requests; decrements the counter on on_response.
• consistent_hash: hashes a configurable request header (or the URI path when the header is absent) to pin requests to a stable endpoint.

YAML configuration

filter: load_balancer
clusters:
  - name: backend
    endpoints: ["10.0.0.1:80"]

Example

use praxis_filter::LoadBalancerFilter;

let yaml: serde_yaml::Value = serde_yaml::from_str(
    r#"
clusters:
  - name: backend
    endpoints: ["10.0.0.1:80"]
"#,
)
.unwrap();
let filter = LoadBalancerFilter::from_config(&yaml).unwrap();
assert_eq!(filter.name(), "load_balancer");

Implementations

impl LoadBalancerFilter

pub fn new(clusters: &[Cluster]) -> Self

Create a load balancer from a list of cluster definitions.

pub fn from_config(config: &Value) -> Result<Box<dyn HttpFilter>, FilterError>

Create a load balancer from parsed YAML config.

Errors

Returns FilterError if the cluster config is invalid.

Trait Implementations

impl HttpFilter for LoadBalancerFilter

fn name(&self) -> &'static str

Unique name identifying this filter type (e.g. "router", "rate_limit").

fn on_request<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, ctx: &'life1 mut HttpFilterContext<'life2>, ) -> Pin<Box<dyn Future<Output = Result<FilterAction, FilterError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Called for each incoming request, in pipeline order.

fn on_response<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, ctx: &'life1 mut HttpFilterContext<'life2>, ) -> Pin<Box<dyn Future<Output = Result<FilterAction, FilterError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Called for each response, in reverse pipeline order.

fn request_body_access(&self) -> BodyAccess

Declares what access this filter needs to request bodies.

fn response_body_access(&self) -> BodyAccess

Declares what access this filter needs to response bodies.

fn request_body_mode(&self) -> BodyMode

Declares the delivery mode for request body chunks.

fn response_body_mode(&self) -> BodyMode

Declares the delivery mode for response body chunks.

fn needs_request_context(&self) -> bool

Whether this filter needs the original request context during body phases.

fn apply_insecure_options(&self, _options: &InsecureOptions)

Apply global InsecureOptions to this filter.

fn compression_config(&self) -> Option<&CompressionConfig>

Returns the compression configuration if this filter enables response compression.

fn on_request_body<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, ctx: &'life1 mut HttpFilterContext<'life2>, body: &'life3 mut Option<Bytes>, end_of_stream: bool, ) -> Pin<Box<dyn Future<Output = Result<FilterAction, FilterError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait,

Called for each chunk of request body data, in pipeline order.

fn on_response_body( &self, ctx: &mut HttpFilterContext<'_>, body: &mut Option<Bytes>, end_of_stream: bool, ) -> Result<FilterAction, FilterError>

Called for each chunk of response body data, in reverse pipeline order.