federation

type EntityFetchSpec struct {
	Subgraph       *Subgraph
	TypeName       string   // entity type, e.g. "User"
	KeyFields      []string // key field names, e.g. ["id"]
	RequiresFields []string // @requires fields to embed in representations beyond key fields
	Selection      string   // the selection body: "reviews {\n  title\n}\n" (kept for backward compat)
	Query          string   // full entity query with variable declarations; supersedes Selection when non-empty
	Variables      []string // operation variable names to forward beyond "representations"
	ParentPath     []string // JSON path to the parent in the merged data, e.g. ["user"]
	IsParentList   bool     // true when ParentPath resolves to a list
}

type EntityFetchSpecData struct {
	SubgraphEnum   string   `json:"subgraphEnum"`
	TypeName       string   `json:"typeName"`
	KeyFields      []string `json:"keyFields"`
	RequiresFields []string `json:"requiresFields,omitempty"`
	Selection      string   `json:"selection"`
	Query          string   `json:"query,omitempty"`
	Variables      []string `json:"variables,omitempty"`
	ParentPath     []string `json:"parentPath"`
	IsParentList   bool     `json:"isParentList,omitempty"`
}

type FetchSpec struct {
	Subgraph  *Subgraph
	Query     string
	Variables []string // variable names from the original operation used here
}

type FetchSpecData struct {
	SubgraphEnum string   `json:"subgraphEnum"`
	Query        string   `json:"query"`
	Variables    []string `json:"variables,omitempty"`
}

type FieldProjection struct {
	Key      string             // response key (alias or field name)
	Children []*FieldProjection // nil for scalar fields
}

type GraphQLError struct {
	Message    string                 `json:"message"`
	Locations  []map[string]int       `json:"locations,omitempty"`
	Path       []interface{}          `json:"path,omitempty"`
	Extensions map[string]interface{} `json:"extensions,omitempty"`
}

type GraphQLRequest struct {
	Query         string                 `json:"query"`
	OperationName string                 `json:"operationName,omitempty"`
	Variables     map[string]interface{} `json:"variables,omitempty"`
}

type GraphQLResponse struct {
	Data   json.RawMessage `json:"data"`
	Errors []GraphQLError  `json:"errors,omitempty"`
}

type Plan struct {
	// Fetches are the initial per-subgraph queries, safe to run in parallel.
	Fetches []*FetchSpec
	// EntityFetches run after Fetches in order; later steps may depend on earlier ones.
	EntityFetches []*EntityFetchSpec
	// Projection holds the user-requested field tree, used to strip planner-added
	// fields (key fields, __typename, @requires pre-fetch fields) from the final response.
	Projection []*FieldProjection
}

type PlanSpec struct {
	Fetches       []*FetchSpecData       `json:"fetches"`
	EntityFetches []*EntityFetchSpecData `json:"entityFetches,omitempty"`
	Projection    []*FieldProjection     `json:"projection,omitempty"`
}

type Subgraph struct {
	EnumName string // join__Graph enum value, e.g. "ACCOUNTS"
	Name     string // human name from @join__graph, e.g. "accounts"
	URL      string // service URL
}

type Supergraph struct {
	// contains filtered or unexported fields
}