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//! Outbound dispatcher (feature `outbound`).
//!
//! Typed API for `nexo/dispatch` JSON-RPC requests the microapp
//! sends to the daemon. **v0 stub** — the daemon-side runtime
//! is not wired yet; until then every method returns
//! [`DispatchError::Transport`] with a clear "82.3.b runtime not
//! ready" message so calling code is forced to handle the
//! error path.
use thiserror::Error;
/// Acknowledgment returned by a successful dispatch.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DispatchAck {
/// Provider-stamped message id, when available.
pub msg_id: Option<String>,
}
/// Reasons a dispatch can fail.
///
/// Operator-facing diagnostic — `#[non_exhaustive]` so future
/// failure modes (e.g. `IdempotencyConflict`) land as semver-minor.
#[non_exhaustive]
#[derive(Debug, Error, Clone, PartialEq, Eq)]
pub enum DispatchError {
/// `(channel, account_id)` pair is not in the extension's
/// declared `[outbound_bindings]` allowlist.
#[error("unauthorized binding `{channel}:{account_id}`")]
UnauthorizedBinding {
/// Channel that was attempted.
channel: String,
/// Account id that was attempted.
account_id: String,
},
/// No adapter registered for the requested channel.
#[error("channel `{0}` adapter not registered")]
ChannelUnavailable(String),
/// Per-extension rate limit hit.
#[error("rate limit exceeded")]
RateLimitExceeded,
/// Validation failed (missing required field, malformed
/// input, etc.).
#[error("validation error: {0}")]
ValidationError(String),
/// Transport-level failure — broker offline, JSON-RPC wire
/// error, daemon-side panic.
#[error("transport: {0}")]
Transport(String),
}
/// Outbound dispatcher.
///
/// Constructed internally by the SDK; microapps access it via
/// `ctx.outbound()` from a tool handler.
#[derive(Debug, Clone)]
pub struct OutboundDispatcher {
/// v0 stub flag. Future versions wire up the JSON-RPC
/// request-from-extension transport; until then every method
/// returns `Transport("82.3.b runtime not ready")`.
stub: bool,
}
impl OutboundDispatcher {
/// Build a stub dispatcher. v0 — every send returns
/// `DispatchError::Transport`.
pub fn new_stub() -> Self {
Self { stub: true }
}
/// Dispatch a plain-text outbound message.
///
/// v0: returns `DispatchError::Transport("82.3.b runtime not
/// ready")`. The real implementation arrives with daemon-side
/// support.
pub async fn send_text(
&self,
channel: &str,
account_id: &str,
to: &str,
text: &str,
) -> Result<DispatchAck, DispatchError> {
let _ = (channel, account_id, to, text);
if self.stub {
return Err(DispatchError::Transport(
"82.3.b runtime not ready".to_string(),
));
}
Ok(DispatchAck { msg_id: None })
}
/// Dispatch a media outbound message.
///
/// v0 stub — see [`Self::send_text`].
pub async fn send_media(
&self,
channel: &str,
account_id: &str,
to: &str,
media_url: &str,
caption: Option<&str>,
) -> Result<DispatchAck, DispatchError> {
let _ = (channel, account_id, to, media_url, caption);
if self.stub {
return Err(DispatchError::Transport(
"82.3.b runtime not ready".to_string(),
));
}
Ok(DispatchAck { msg_id: None })
}
}
#[cfg(test)]
mod tests {
use super::*;
#[tokio::test]
async fn send_text_stub_returns_transport_error() {
let d = OutboundDispatcher::new_stub();
let r = d.send_text("whatsapp", "personal", "+5491100", "hi").await;
assert!(matches!(r, Err(DispatchError::Transport(_))));
}
#[tokio::test]
async fn send_media_stub_returns_transport_error() {
let d = OutboundDispatcher::new_stub();
let r = d
.send_media("whatsapp", "personal", "+5491100", "http://x", None)
.await;
assert!(matches!(r, Err(DispatchError::Transport(_))));
}
#[test]
fn dispatch_error_unauthorized_binding_renders_message() {
let e = DispatchError::UnauthorizedBinding {
channel: "whatsapp".into(),
account_id: "x".into(),
};
assert!(format!("{e}").contains("unauthorized binding"));
}
}