Zig API Reference

Zig API Reference v0.17.0¶

Functions¶

schema_query_only()¶

Create a simple schema configuration with only Query type.

This is a convenience function for schemas that only have queries.

Returns:

A QueryOnlyConfig with default settings

Signature:

pub fn schema_query_only() []u8

Example:

const result = schema_query_only();

Returns: []u8

schema_query_mutation()¶

Create a schema configuration with Query and Mutation types.

This is a convenience function for schemas with queries and mutations but no subscriptions.

Returns:

A QueryMutationConfig with default settings

Signature:

pub fn schema_query_mutation() []u8

Example:

const result = schema_query_mutation();

Returns: []u8

schema_full()¶

Create a schema configuration with all three root types.

This is a convenience function for fully-featured schemas.

Returns:

A FullSchemaConfig with default settings

Signature:

pub fn schema_full() []u8

Example:

const result = schema_full();

Returns: []u8

Types¶

ApiKeyAuthConfig¶

Per-route API key authentication requirement.

Mirrors spikard_http.ApiKeyConfig for the same reason JwtAuthConfig mirrors spikard_http.JwtConfig: spikard-core cannot depend on spikard-http.

ApiKeyConfig¶

API Key authentication configuration

AsyncApiConfig¶

AsyncAPI HTTP endpoint configuration

AuthorizationConfig¶

Per-route roles/scopes/permissions authorization requirement.

spikard_http.auth.Claims does not yet carry roles, scopes, or permissions, so nothing can enforce this today. This type only defines the requirement shape; a later phase must extend Claims (or an equivalent claims-decoding path) to populate them before enforcement is possible.

Deserialization goes through AuthorizationConfigRepr rather than a derive so the fixture's singular {"required_role": "admin"} shape (fixtures/problem_details.json's problem_details_403_forbidden) populates required_roles instead of being silently dropped as an unrecognized field — a config that parses to "no constraint" from real authorization data is a vacuous-pass bug, not a compatibility shim. deny_unknown_fields on the repr means any other unrecognized key is a loud deserialize error instead.

BackgroundJobMetadata¶

BackgroundTaskConfig¶

Configuration for in-process background task execution.

CompressionConfig¶

Compression configuration shared across runtimes

ContactInfo¶

Contact information

CorsConfig¶

CORS configuration for a route

DynamicSchemaConfig¶

Configuration for building and executing a dynamic-SDL schema.

FieldErrorSpec¶

A field-level error to inject at a specific response path.

path is the dot-separated sequence of field names from the operation root to the field that should fail, e.g. "user" for a top-level field or "order.customer" for a nested one.

FullSchemaConfig¶

Configuration for fully-featured schemas with Query, Mutation, and Subscription types

GraphQlRouteConfig¶

Configuration for GraphQL routes

Provides a builder pattern for configuring GraphQL route parameters for the Spikard HTTP server's routing system.

Methods¶

new()¶

Create a new GraphQL route configuration with defaults

Default values:

• path: "/graphql"
• method: "POST"
• enable_playground: false

Signature:

pub fn new_graph_ql_route_config() GraphQLRouteConfig

Example:

const result = new_graph_ql_route_config();

Returns: GraphQLRouteConfig

path()¶

Set the HTTP path for the GraphQL endpoint

Signature:

pub fn path(self: *const GraphQlRouteConfig, path: []const u8) GraphQLRouteConfig

Example:

const result = instance.path("value");

Parameters:

Returns: GraphQLRouteConfig

method()¶

Set the HTTP method for the GraphQL endpoint

Signature:

pub fn method(self: *const GraphQlRouteConfig, method: []const u8) GraphQLRouteConfig

Example:

const result = instance.method("value");

Parameters:

Returns: GraphQLRouteConfig

enable_playground()¶

Enable or disable the GraphQL Playground UI

Signature:

pub fn enable_playground(self: *const GraphQlRouteConfig, enable: bool) GraphQLRouteConfig

Example:

const result = instance.enable_playground(true);

Parameters:

Returns: GraphQLRouteConfig

description()¶

Set a custom description for documentation

Signature:

pub fn description(self: *const GraphQlRouteConfig, description: []const u8) GraphQLRouteConfig

Example:

const result = instance.description("value");

Parameters:

Returns: GraphQLRouteConfig

get_path()¶

Get the configured path

Signature:

pub fn get_path(self: *const GraphQlRouteConfig) []u8

Example:

const result = instance.get_path();

Returns: []u8

get_method()¶

Get the configured method

Signature:

pub fn get_method(self: *const GraphQlRouteConfig) []u8

Example:

const result = instance.get_method();

Returns: []u8

is_playground_enabled()¶

Check if playground is enabled

Signature:

pub fn is_playground_enabled(self: *const GraphQlRouteConfig) bool

Example:

const result = instance.is_playground_enabled();

Returns: bool

get_description()¶

Get the description if set

Signature:

pub fn get_description(self: *const GraphQlRouteConfig) ?[]u8

Example:

const result = instance.get_description();

Returns: ?[]u8

GraphQlSubscriptionSnapshot¶

Snapshot of a GraphQL subscription exchange over WebSocket.

Derives Serialize so language bindings (e.g. the JNI backend) can marshal it across the FFI boundary via serde_json without a hand-written wrapper.

GrpcConfig¶

Configuration for gRPC support

Controls how the server handles gRPC requests, including compression, timeouts, and protocol settings.

Stream Limits¶

This configuration enforces message-level size limits but delegates concurrent stream limiting to the HTTP/2 transport layer:

• Message Size Limits: The max_message_size field is enforced per individual message (request or response) in both unary and streaming RPCs. When a single message exceeds this limit, the request is rejected with PAYLOAD_TOO_LARGE (HTTP 413).

• Concurrent Stream Limits: The max_concurrent_streams is an advisory configuration passed to the HTTP/2 layer for connection-level stream negotiation. The HTTP/2 transport automatically enforces this limit and returns GOAWAY frames when exceeded. Applications should not rely on custom enforcement of this limit.

• Stream Response Size Limits: The max_stream_response_bytes field caps the total encoded bytes emitted across a server-streaming or bidi-streaming response. When the cumulative size exceeds the limit, the stream is terminated with tonic.Status.resource_exhausted. Defaults to null (unbounded).

IntoHandler¶

Convert user-facing handler functions into the low-level Handler trait.

Methods¶

into_handler()¶

Convert this value into a shared request handler.

Signature:

pub fn into_handler(self: *const IntoHandler) Handler

Example:

const result = instance.into_handler();

Returns: Handler

JsonRpcConfig¶

JSON-RPC server configuration

JsonRpcMethodInfo¶

JSON-RPC method metadata for routes that support JSON-RPC

This struct captures the metadata needed to expose HTTP routes as JSON-RPC methods, enabling discovery and documentation of RPC-compatible endpoints.

JwtAuthConfig¶

Per-route JWT authentication requirement.

spikard-http defines the canonical JwtConfig used by ServerConfig.jwt_auth, but spikard-core cannot depend on spikard-http (the dependency runs the other way), so that type cannot be reused here. This mirrors its fields so a later enforcement phase in spikard-http can convert between the two without losing information.

secret and public_key are both optional because asymmetric algorithms (RS256, ES256, ...) verify against a public key rather than a shared secret; see fixtures/auth.json's jwt_config_algorithm_rs256, which carries public_key and no secret at all. Exactly one is expected to be populated for a given algorithm, but that cross-field invariant is left to a later enforcement phase rather than the type itself.

JwtConfig¶

JWT authentication configuration

LicenseInfo¶

License information

LifecycleHookRef¶

A single lifecycle hook reference within a LifecycleHooksConfig phase.

Matches the fixture shape exactly (fixtures/lifecycle_hooks.json, fixtures/di.json): each entry is an object with a required name and handler, an optional list of dependency keys, and an optional free-form config blob (e.g. {"max_requests": 10, "window_seconds": 60} for a rate-limiting hook). deny_unknown_fields turns future fixture drift into a loud error.

LifecycleHooksConfig¶

Per-route selection of registered lifecycle hooks.

ServerConfig.lifecycle_hooks holds Arc<dyn LifecycleHook> function pointers and is marked #[serde(skip)] / #[alef(skip)] because closures cannot be serialized or cross the FFI boundary. A per-route field with that same shape would be invisible to alef, and therefore invisible to every binding — defeating the purpose of exposing it here. This descriptor carries LifecycleHookRef entries instead: each one names a registered hook (plus its declared dependencies and optional config), so a later enforcement phase can resolve those names against the server's registered LifecycleHooks and run the matches for this route. The five fields mirror the five hook phases documented in the tower-middleware-and-lifecycle project convention (onRequest, preValidation, preHandler, onResponse, onError).

OpenApiConfig¶

OpenAPI configuration

ParseRequest¶

Request body for POST /asyncapi/parse

ParseResult¶

Full parse result returned by POST /asyncapi/parse

ParsedChannel¶

A single channel extracted from an AsyncAPI spec

ParsedMessage¶

A resolved message (name + JSON Schema)

ParsedOperation¶

A single operation extracted from an AsyncAPI spec

ProblemDetails¶

RFC 9457 Problem Details for HTTP APIs

A machine-readable format for specifying errors in HTTP API responses. Per RFC 9457, all fields are optional. The type field defaults to "about:blank" if not specified.

Content-Type¶

Responses using this struct should set:

Content-Type: application/problem+json

{
  "type": "<https://spikard.dev/errors/validation-error>",
  "title": "Request Validation Failed",
  "status": 422,
  "detail": "2 validation errors in request body",
  "errors": [...]
}

QueryMutationConfig¶

Configuration for schemas with Query and Mutation types

QueryOnlyConfig¶

Configuration for schemas with only Query type

RateLimitConfig¶

Rate limiting configuration shared across runtimes

Request¶

RequestIdConfig¶

Per-route request-id generation/propagation override.

Modeled as a struct rather than Option<bool> on RouteMetadata because the wire shape is an object, not a bare boolean: fixtures/request_id.json's request_id_middleware_can_be_disabled sends {"enabled": false}, which Option<bool> cannot deserialize at all ("invalid type: map, expected a boolean") — the very fixture whose purpose is proving the middleware can be disabled was the one that failed to parse.

Response¶

HTTP Response with custom status code, headers, and content

ResponseSnapshot¶

Snapshot of an Axum response used by higher-level language bindings.

RouteBuilder¶

Builder for defining a route.

Methods¶

new()¶

Create a new builder for the provided HTTP method and path.

Signature:

pub fn new_route_builder(method: Method, path: []const u8) RouteBuilder

Example:

const result = new_route_builder(.{}, "value");

Parameters:

Returns: RouteBuilder

handler_name()¶

Assign an explicit handler name.

Signature:

pub fn handler_name(self: *const RouteBuilder, name: []const u8) RouteBuilder

Example:

const result = instance.handler_name("value");

Parameters:

Returns: RouteBuilder

request_schema_json()¶

Provide a raw JSON schema for the request body.

Signature:

pub fn request_schema_json(self: *const RouteBuilder, schema: []const u8) RouteBuilder

Example:

const result = instance.request_schema_json(.{});

Parameters:

Returns: RouteBuilder

response_schema_json()¶

Provide a raw JSON schema for the response body.

Signature:

pub fn response_schema_json(self: *const RouteBuilder, schema: []const u8) RouteBuilder

Example:

const result = instance.response_schema_json(.{});

Parameters:

Returns: RouteBuilder

params_schema_json()¶

Provide a raw JSON schema for request parameters.

Signature:

pub fn params_schema_json(self: *const RouteBuilder, schema: []const u8) RouteBuilder

Example:

const result = instance.params_schema_json(.{});

Parameters:

Returns: RouteBuilder

file_params_json()¶

Provide multipart file parameter configuration.

Signature:

pub fn file_params_json(self: *const RouteBuilder, schema: []const u8) RouteBuilder

Example:

const result = instance.file_params_json(.{});

Parameters:

Returns: RouteBuilder

cors()¶

Attach a CORS configuration for this route.

Signature:

pub fn cors(self: *const RouteBuilder, cors: []const u8) RouteBuilder

Example:

const result = instance.cors(.{});

Parameters:

Returns: RouteBuilder

compression()¶

Attach a compression configuration for this route.

Signature:

pub fn compression(self: *const RouteBuilder, compression: []const u8) RouteBuilder

Example:

const result = instance.compression(.{});

Parameters:

Returns: RouteBuilder

body_limit()¶

Attach a per-route maximum request body size in bytes, overriding the server-global default.

Signature:

pub fn body_limit(self: *const RouteBuilder, max_bytes: u64) RouteBuilder

Example:

const result = instance.body_limit(42);

Parameters:

Returns: RouteBuilder

request_timeout()¶

Attach a per-route request timeout in seconds, overriding the server-global default.

Signature:

pub fn request_timeout(self: *const RouteBuilder, seconds: u64) RouteBuilder

Example:

const result = instance.request_timeout(42);

Parameters:

Returns: RouteBuilder

rate_limit()¶

Attach a per-route rate limiting configuration, overriding the server-global default.

Signature:

pub fn rate_limit(self: *const RouteBuilder, rate_limit: []const u8) RouteBuilder

Example:

const result = instance.rate_limit(.{});

Parameters:

Returns: RouteBuilder

request_id()¶

Force per-route request-id generation on or off, overriding the server-global default.

Takes a plain bool rather than RequestIdConfig directly: the wire/metadata type had to become a struct to represent {"enabled": false} (see RequestIdConfig's docs), but this builder is the ergonomic call site (.request_id(true)), so it keeps accepting a bool and wraps it into RequestIdConfig internally in Self.into_metadata.

Signature:

pub fn request_id(self: *const RouteBuilder, enabled: bool) RouteBuilder

Example:

const result = instance.request_id(true);

Parameters:

Returns: RouteBuilder

jwt_auth()¶

Require JWT authentication for this route.

Signature:

pub fn jwt_auth(self: *const RouteBuilder, config: []const u8) RouteBuilder

Example:

const result = instance.jwt_auth(.{});

Parameters:

Returns: RouteBuilder

api_key_auth()¶

Require API key authentication for this route.

Signature:

pub fn api_key_auth(self: *const RouteBuilder, config: []const u8) RouteBuilder

Example:

const result = instance.api_key_auth(.{});

Parameters:

Returns: RouteBuilder

authorization()¶

Attach a roles/scopes/permissions authorization requirement for this route.

Signature:

pub fn authorization(self: *const RouteBuilder, config: []const u8) RouteBuilder

Example:

const result = instance.authorization(.{});

Parameters:

Returns: RouteBuilder

lifecycle_hooks()¶

Select registered lifecycle hooks to run for this route.

Signature:

pub fn lifecycle_hooks(self: *const RouteBuilder, hooks: []const u8) RouteBuilder

Example:

const result = instance.lifecycle_hooks(.{});

Parameters:

Returns: RouteBuilder

jsonrpc_method()¶

Expose this route as a JSON-RPC method.

Signature:

pub fn jsonrpc_method(self: *const RouteBuilder, info: []const u8) RouteBuilder

Example:

const result = instance.jsonrpc_method(.{});

Parameters:

Returns: RouteBuilder

openrpc_spec()¶

Attach a literal OpenRPC method spec document for this route, overriding auto-derivation from the Self.jsonrpc_method metadata when present.

Signature:

pub fn openrpc_spec(self: *const RouteBuilder, spec: []const u8) RouteBuilder

Example:

const result = instance.openrpc_spec(.{});

Parameters:

Returns: RouteBuilder

sync()¶

Mark the route as synchronous.

Signature:

pub fn sync(self: *const RouteBuilder) RouteBuilder

Example:

const result = instance.sync();

Returns: RouteBuilder

handler_dependencies()¶

Declare the dependency keys that must be resolved before this handler runs.

Signature:

pub fn handler_dependencies(self: *const RouteBuilder, dependencies: []const u8) RouteBuilder

Example:

const result = instance.handler_dependencies(&[_]u8{});

Parameters:

Returns: RouteBuilder

SchemaConfig¶

Configuration for GraphQL schema building.

Encapsulates all schema-level configuration options including introspection control, complexity limits, and depth limits.

ServerConfig¶

Server configuration

ServerInfo¶

Server information

SseEvent¶

An individual SSE event

Represents a single Server-Sent Event to be sent to a connected client. Events can have an optional type, ID, and retry timeout for advanced scenarios.

SSE Format¶

Events are serialized to the following text format:

event: event_type
data: {"json":"value"}
id: event-123
retry: 3000

StaticFilesConfig¶

Static file serving configuration

TestClient¶

Core test client for making HTTP requests to a Spikard application.

This struct wraps axum-test's TestServer and provides a language-agnostic interface for making HTTP requests, sending WebSocket connections, and handling Server-Sent Events. Language bindings wrap this to provide native API surfaces.

Methods¶

graphql_at()¶

Send a GraphQL query/mutation to a custom endpoint

Signature:

pub fn graphql_at(self: *const TestClient, endpoint: []const u8, query: []const u8, variables: ?[]const u8, operation_name: ?[]const u8) SnapshotError![]u8

Example:

const result = try instance.graphql_at("value", "value", .{}, "value");

Parameters:

Returns: []u8

Errors: Throws SnapshotError.

graphql()¶

Send a GraphQL query/mutation

Signature:

pub fn graphql(self: *const TestClient, query: []const u8, variables: ?[]const u8, operation_name: ?[]const u8) SnapshotError![]u8

Example:

const result = try instance.graphql("value", .{}, "value");

Parameters:

Returns: []u8

Errors: Throws SnapshotError.

graphql_subscription_at()¶

Send a GraphQL subscription (WebSocket) to a custom endpoint.

Uses the graphql-transport-ws protocol and captures the first next payload. After the first payload is received, this client sends complete to unsubscribe.

Signature:

pub fn graphql_subscription_at(self: *const TestClient, endpoint: []const u8, query: []const u8, variables: ?[]const u8, operation_name: ?[]const u8) SnapshotError!GraphQLSubscriptionSnapshot

Example:

const result = try instance.graphql_subscription_at("value", "value", .{}, "value");

Parameters:

Returns: GraphQLSubscriptionSnapshot

Errors: Throws SnapshotError.

graphql_subscription()¶

Send a GraphQL subscription (WebSocket).

Uses /graphql as the default subscription endpoint.

Signature:

pub fn graphql_subscription(self: *const TestClient, query: []const u8, variables: ?[]const u8, operation_name: ?[]const u8) SnapshotError!GraphQLSubscriptionSnapshot

Example:

const result = try instance.graphql_subscription("value", .{}, "value");

Parameters:

Returns: GraphQLSubscriptionSnapshot

Errors: Throws SnapshotError.

TestingSseEvent¶

A single Server-Sent Event.

UploadFile¶

Represents an uploaded file from multipart/form-data requests.

This struct provides efficient access to file content with automatic base64 decoding and implements standard I/O traits for compatibility.

ValidateRequest¶

Request body for POST /asyncapi/validate

ValidationResponse¶

Response body for POST /asyncapi/validate

Enums¶

Method¶

HTTP method

LifecycleHookPhase¶

The five lifecycle phases a hook can be registered against.

Used to resolve a per-route named hook selection (LifecycleHooksConfig in spikard-core.http) against the hooks actually registered on the server: a name is looked up within one specific phase's registered hooks, not across all five, so a hook registered for on_response can never be silently picked up by a route asking for on_request.

SecuritySchemeInfo¶

Security scheme types

SnapshotError¶

Possible errors while converting an Axum response into a snapshot.

WebSocketMessage¶

A WebSocket message that can be text or binary.

Errors¶

AppError¶

Error type for application builder operations.

GraphQlError¶

Errors that can occur during GraphQL operations

These errors are compatible with async-graphql error handling and can be converted to structured HTTP responses matching the project's error fixtures.

SchemaError¶

Error type for schema building operations

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