impl From<&RemoteLashlangToolBinding> for lash_core::LashlangToolBinding {
fn from(value: &RemoteLashlangToolBinding) -> Self {
let RemoteLashlangToolBinding {
module_path,
operation,
authority_type,
aliases,
} = value;
let mut binding =
lash_core::LashlangToolBinding::new(module_path.clone(), operation.clone());
if let Some(authority_type) = authority_type.as_ref() {
binding = binding.with_authority_type(authority_type.clone());
}
binding.with_aliases(aliases.clone())
}
}
impl From<lash_core::SchemaProjectionOverride> for RemoteSchemaProjectionOverride {
fn from(value: lash_core::SchemaProjectionOverride) -> Self {
let lash_core::SchemaProjectionOverride { profile, schema } = value;
Self { profile, schema }
}
}
impl From<RemoteSchemaProjectionOverride> for lash_core::SchemaProjectionOverride {
fn from(value: RemoteSchemaProjectionOverride) -> Self {
let RemoteSchemaProjectionOverride { profile, schema } = value;
Self { profile, schema }
}
}
impl From<RemoteToolAvailability> for lash_core::ToolAvailability {
fn from(value: RemoteToolAvailability) -> Self {
match value {
RemoteToolAvailability::Off => Self::Off,
RemoteToolAvailability::Searchable => Self::Searchable,
RemoteToolAvailability::Callable => Self::Callable,
RemoteToolAvailability::Showcased => Self::Showcased,
}
}
}
impl From<lash_core::ToolAvailability> for RemoteToolAvailability {
fn from(value: lash_core::ToolAvailability) -> Self {
match value {
lash_core::ToolAvailability::Off => Self::Off,
lash_core::ToolAvailability::Searchable => Self::Searchable,
lash_core::ToolAvailability::Callable => Self::Callable,
lash_core::ToolAvailability::Showcased => Self::Showcased,
}
}
}
impl From<RemoteToolActivation> for lash_core::ToolActivation {
fn from(value: RemoteToolActivation) -> Self {
match value {
RemoteToolActivation::Always => Self::Always,
RemoteToolActivation::Internal => Self::Internal,
}
}
}
impl From<RemoteToolScheduling> for lash_core::ToolScheduling {
fn from(value: RemoteToolScheduling) -> Self {
match value {
RemoteToolScheduling::Parallel => Self::Parallel,
RemoteToolScheduling::Serial => Self::Serial,
}
}
}
impl From<RemoteToolOutputContract> for lash_core::ToolOutputContract {
fn from(value: RemoteToolOutputContract) -> Self {
match value {
RemoteToolOutputContract::Static => Self::Static,
RemoteToolOutputContract::FromInputSchema {
input_field,
default_schema,
} => Self::FromInputSchema {
input_field,
default_schema,
},
}
}
}
impl From<RemoteToolArgumentProjectionPolicy> for lash_core::ToolArgumentProjectionPolicy {
fn from(value: RemoteToolArgumentProjectionPolicy) -> Self {
match value {
RemoteToolArgumentProjectionPolicy::MaterializeProjectedValues => {
Self::MaterializeProjectedValues
}
RemoteToolArgumentProjectionPolicy::PreserveProjectedRefsInField { field } => {
Self::PreserveProjectedRefsInField { field }
}
}
}
}
impl From<RemoteToolRetryPolicy> for lash_core::ToolRetryPolicy {
fn from(value: RemoteToolRetryPolicy) -> Self {
match value {
RemoteToolRetryPolicy::Never => Self::Never,
RemoteToolRetryPolicy::Safe {
max_attempts,
base_delay_ms,
max_delay_ms,
} => Self::Safe {
max_attempts,
base_delay_ms,
max_delay_ms,
},
RemoteToolRetryPolicy::Idempotent {
max_attempts,
base_delay_ms,
max_delay_ms,
} => Self::Idempotent {
max_attempts,
base_delay_ms,
max_delay_ms,
},
}
}
}
impl TryFrom<&RemoteToolGrant> for ToolDefinition {
type Error = RemoteProtocolError;
fn try_from(value: &RemoteToolGrant) -> Result<Self, Self::Error> {
value.validate()?;
let RemoteToolGrant {
protocol_version: _,
id,
name,
description,
input_schema,
output_schema,
input_schema_projections,
output_schema_projections,
output_contract,
examples,
availability,
activation,
argument_projection,
scheduling,
retry_policy,
lashlang_binding,
} = value;
let mut definition = ToolDefinition::raw_with_id(
id.clone()
.unwrap_or_else(|| format!("remote-tool:{}", value.call_path().unwrap())),
name.clone(),
description.clone(),
input_schema.clone(),
output_schema.clone(),
)
.with_lashlang_binding(
lashlang_binding
.as_ref()
.expect("validated lashlang binding")
.into(),
)
.with_examples(examples.clone())
.with_output_contract(output_contract.clone().into());
if let Some(availability) = *availability {
definition = definition
.with_availability(lash_core::ToolAvailabilityConfig::same(availability.into()));
}
if let Some(activation) = *activation {
definition = definition.with_activation(activation.into());
}
if let Some(argument_projection) = argument_projection.clone() {
definition = definition.with_argument_projection(argument_projection.into());
}
if let Some(scheduling) = *scheduling {
definition = definition.with_scheduling(scheduling.into());
}
if let Some(retry_policy) = *retry_policy {
definition = definition.with_retry_policy(retry_policy.into());
}
for projection in input_schema_projections {
definition = definition.with_input_schema_projection(
projection.profile.clone(),
projection.schema.clone(),
);
}
for projection in output_schema_projections {
definition = definition.with_output_schema_projection(
projection.profile.clone(),
projection.schema.clone(),
);
}
Ok(definition)
}
}
impl RemoteToolCallResponse {
pub fn into_tool_result(self) -> ToolResult {
match self {
Self::Success {
protocol_version: _,
value,
} => ToolResult::ok(value),
Self::Failure {
protocol_version: _,
code,
message,
raw,
retry_after_ms,
} => {
let mut failure = if let Some(after_ms) = retry_after_ms {
lash_core::ToolFailure::safe_retry(
lash_core::ToolFailureClass::Execution,
code,
message,
Some(after_ms),
)
} else {
lash_core::ToolFailure::tool(
lash_core::ToolFailureClass::Execution,
code,
message,
)
};
failure.raw = raw.map(lash_core::ToolValue::from);
ToolResult::failure(failure)
}
Self::Cancelled {
protocol_version: _,
message,
raw,
} => {
if let Some(raw) = raw {
ToolResult::cancelled_with_raw(message, raw)
} else {
ToolResult::cancelled(message)
}
}
Self::Pending {
protocol_version: _,
deadline_ms,
on_timeout,
on_cancel,
} => {
let mut pending = lash_core::PendingCompletion::new();
if let Some(deadline_ms) = deadline_ms {
pending.deadline = Some(std::time::Duration::from_millis(deadline_ms));
}
pending.on_timeout = match on_timeout {
RemoteTimeoutBehavior::ErrorAsResult => {
lash_core::TimeoutBehavior::ErrorAsResult
}
RemoteTimeoutBehavior::FailTurn => lash_core::TimeoutBehavior::FailTurn,
};
pending.on_cancel = match on_cancel {
RemoteCancelHint::Ignore => lash_core::CancelHint::Ignore,
RemoteCancelHint::CancelExternalWork => {
lash_core::CancelHint::CancelExternalWork
}
};
ToolResult::pending(pending)
}
}
}
}
pub trait RemoteToolTransport: Send + Sync + 'static {
fn send<'a>(
&'a self,
request: RemoteToolCallRequest,
) -> Pin<
Box<dyn Future<Output = Result<RemoteToolCallResponse, RemoteProtocolError>> + Send + 'a>,
>;
}
pub struct RemoteToolProvider<T: RemoteToolTransport> {
manifests: Vec<ToolManifest>,
contracts: HashMap<String, Arc<ToolContract>>,
call_paths: HashMap<String, String>,
transport: T,
}
impl<T: RemoteToolTransport> RemoteToolProvider<T> {
pub fn new(grants: Vec<RemoteToolGrant>, transport: T) -> Result<Self, RemoteProtocolError> {
RemoteToolGrant::validate_all(&grants)?;
let mut manifests = Vec::with_capacity(grants.len());
let mut contracts = HashMap::with_capacity(grants.len());
let mut call_paths = HashMap::with_capacity(grants.len());
for grant in grants {
let definition = ToolDefinition::try_from(&grant)?;
let manifest = definition.manifest();
let executable = lash_core::LashlangToolBinding::required_for_remote(&manifest)
.map_err(|message| RemoteProtocolError::InvalidToolGrant {
tool_name: manifest.name.clone(),
message,
})?;
contracts.insert(manifest.name.clone(), Arc::new(definition.contract()));
call_paths.insert(manifest.name.clone(), executable.call_path());
manifests.push(manifest);
}
Ok(Self {
manifests,
contracts,
call_paths,
transport,
})
}
}
impl<T: RemoteToolTransport> ToolProvider for RemoteToolProvider<T> {
fn tool_manifests(&self) -> Vec<ToolManifest> {
self.manifests.clone()
}
fn resolve_manifest(&self, name: &str) -> Option<ToolManifest> {
self.manifests
.iter()
.find(|manifest| manifest.name == name)
.cloned()
}
fn resolve_contract(&self, name: &str) -> Option<Arc<ToolContract>> {
self.contracts.get(name).cloned()
}
fn execute<'life0, 'life1, 'async_trait>(
&'life0 self,
call: ToolCall<'life1>,
) -> Pin<Box<dyn Future<Output = ToolResult> + Send + 'async_trait>>
where
'life0: 'async_trait,
'life1: 'async_trait,
Self: 'async_trait,
{
Box::pin(async move {
if call
.context
.cancellation_token()
.is_some_and(|token| token.is_cancelled())
{
return ToolResult::cancelled("remote tool call cancelled before dispatch");
}
let Some(call_path) = self.call_paths.get(call.name) else {
return ToolResult::err_fmt(format_args!("unknown remote tool `{}`", call.name));
};
let completion_key = match call.context.completion_key().await {
Ok(key) => match serde_json::to_value(key) {
Ok(value) => value,
Err(err) => return ToolResult::err_fmt(err),
},
Err(err) => return ToolResult::err_fmt(err),
};
let mut headers = HashMap::new();
if let Some(tool_call_id) = call.context.tool_call_id() {
headers.insert("x-lash-tool-call-id".to_string(), tool_call_id.to_string());
}
let replay_key = call.context.replay_key().map(str::to_string).or_else(|| {
call.context.tool_call_id().map(|call_id| {
format!(
"lash-tool:{}:{call_id}:{}",
call.context.session_id(),
call.name
)
})
});
if let Some(replay_key) = replay_key.as_ref() {
headers.insert("x-lash-replay-key".to_string(), replay_key.clone());
}
let request = RemoteToolCallRequest {
protocol_version: REMOTE_PROTOCOL_VERSION,
tool_name: call.name.to_string(),
call_path: call_path.clone(),
args: call.args.clone(),
session_id: call.context.session_id().to_string(),
completion_key,
tool_call_id: call.context.tool_call_id().map(str::to_string),
replay_key,
attempt_number: call.context.attempt_number(),
max_attempts: call.context.max_attempts(),
headers,
};
match self.transport.send(request).await {
Ok(response) => match response.validate() {
Ok(()) => response.into_tool_result(),
Err(err) => ToolResult::err_fmt(err),
},
Err(err) => ToolResult::err_fmt(err),
}
})
}
}