Struct CrossSubgraphValidator 

pub struct CrossSubgraphValidator { /* private fields */ }

Validator for cross-subgraph federation consistency

Validates that multiple federated subgraphs form a valid federation by checking:

• @key directive consistency across all subgraphs
• @external field ownership rules
• @shareable field consistency

Named subgraphs are used in error messages for clear debugging context.

Implementations

impl CrossSubgraphValidator

pub fn new(subgraphs: Vec<(String, FederationMetadata)>) -> Self

Create a new cross-subgraph validator with named subgraphs

Arguments

• subgraphs: Vector of (subgraph_name, metadata) tuples

Subgraph names are used in error messages to identify problem sources.

pub fn validate_consistency(&self) -> Result<(), Vec<CompositionError>>

Validate consistency across all subgraphs

Performs comprehensive cross-subgraph validation and collects all errors before returning. This allows callers to see all problems at once.

Errors

Returns Err with vector of all consistency errors found. Returns Ok(()) if all validation passes.

Trait Implementations

impl Debug for CrossSubgraphValidator

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

Formats the value using the given formatter.