Struct CallConfig 

pub struct CallConfig {

    pub function: String,
    pub module: String,
    pub result_var: String,
    pub async: bool,
    pub path: Option<String>,
    pub method: Option<String>,
    pub args: Vec<ArgMapping>,
    pub overrides: HashMap<String, CallOverride>,
    pub returns_result: bool,
    pub returns_void: bool,
    pub skip_languages: Vec<String>,
    pub result_is_simple: bool,
    pub result_is_vec: bool,
    pub result_is_array: bool,
    pub result_is_bytes: bool,
    pub result_is_option: bool,
    pub select_when: Option<SelectWhen>,
}

Configuration for the function call in each test.

Fields

function: String

The function name (alef applies language naming conventions).

module: String

The module/package where the function lives.

result_var: String

Variable name for the return value (default: “result”).

async: bool

Whether the function is async.

path: Option<String>

HTTP endpoint path for mock server routing (e.g., "/v1/chat/completions").

Required when fixtures use mock_response. The Rust e2e generator uses this to build the MockRoute that the mock server matches against.

method: Option<String>

HTTP method for mock server routing (default: "POST").

Used together with path when building MockRoute entries.

args: Vec<ArgMapping>

How fixture input fields map to function arguments.

overrides: HashMap<String, CallOverride>

Per-language overrides for module/function/etc.

returns_result: bool

Whether the function returns Result<T, E> in its native binding. Defaults to true. When false, generators that distinguish Result-returning from non-Result-returning calls (currently Rust) will skip the .expect("should succeed") unwrap and bind the raw return value directly.

returns_void: bool

Whether the function returns only an error/unit — i.e., Result<(), E>.

When combined with returns_result = true, Go generators emit err := func() (single return value) rather than _, err := func() (two return values). This is needed for functions like validate_host that return only error in Go.

skip_languages: Vec<String>

skip_languages

result_is_simple: bool

When true, the function returns a primitive (e.g. String, bool, i32) rather than a struct. Generators that would otherwise emit result.<field> will fall back to the bare result variable.

This is a property of the Rust core’s return type and therefore identical across every binding — set it on the call, not in per-language overrides. The same flag is also accepted under [e2e.calls.<name>.overrides.<lang>] for backwards compatibility, but the call-level value takes precedence.

result_is_vec: bool

When true, the function returns Vec<T> / Array<T>. Generators that support per-element field assertions (rust, csharp) iterate or index into the result; the typescript codegen indexes [0] to mirror csharp.

As with result_is_simple, this is a Rust-side property — set it on the call, not on per-language overrides. Per-language overrides remain supported for backwards compatibility.

result_is_array: bool

When true (combined with result_is_simple), the simple return is a slice/array (e.g., Vec<String> → string[] in TS).

result_is_bytes: bool

When true, the function returns a raw byte array (Vec<u8> → Uint8Array / []byte / byte[]).

result_is_option: bool

When true, the function returns Option<T>.

select_when: Option<SelectWhen>

Automatic fixture-routing condition.

When set, a fixture whose call field is None is routed to this named call config if the condition is satisfied. This avoids the need to tag every fixture with "call": "batch_scrape" when the fixture shape already identifies the call.

Example (alef.toml):

[e2e.calls.batch_scrape]
select_when = { input_has = "batch_urls" }

Trait Implementations

impl Clone for CallConfig

fn clone(&self) -> CallConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CallConfig

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

Formats the value using the given formatter.

impl Default for CallConfig

fn default() -> CallConfig

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CallConfig

fn deserialize<__D>( __deserializer: __D, ) -> Result<CallConfig, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for CallConfig

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.