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use thiserror::Error;
/// Errors that occur during agent operations.
///
/// Errors are categorized into:
///
/// - **Configuration errors**: `InvalidConfig`, `UnknownConfig`, `NoConfig`
/// - **Value errors**: `InvalidValue`, `InvalidArrayValue`
/// - **Agent management errors**: `AgentNotFound`, `AgentAlreadyExists`
/// - **Connection errors**: `ConnectionNotFound`, `ConnectionAlreadyExists`
/// - **I/O errors**: `IoError`, `SerializationError`, `JsonParseError`
/// - **Retryable / provider errors**: `RateLimited`, `Overloaded`, `Timeout`, `ContextOverflow`, `Cancelled`
#[derive(Clone, Debug, Error)]
pub enum AgentError {
/// Invalid value in an array element.
#[error("Invalid {0} value in array")]
InvalidArrayValue(String),
/// Agent definition is invalid.
#[error("{0}: Agent definition \"{1}\" is invalid")]
InvalidDefinition(String, String),
/// Invalid port name.
#[error("Invalid port: {0}")]
InvalidPin(String),
/// Invalid preset name.
#[error("Invalid preset name: {0}")]
InvalidPresetName(String),
/// Invalid value for the expected type.
#[error("Invalid {0} value")]
InvalidValue(String),
/// Agent definition is missing a required field.
#[error("{0}: Agent definition \"{1}\" is missing")]
MissingDefinition(String, String),
/// Failed to rename a preset.
#[error("Failed to rename preset: {0}")]
RenamePresetFailed(String),
/// Unknown agent definition kind.
#[error("Unknown agent def kind: {0}")]
UnknownDefKind(String),
/// Unknown agent definition name.
#[error("Unknown agent def name: {0}")]
UnknownDefName(String),
/// Agent definition is not implemented.
#[error("Agent definition \"{0}\" is not implemented")]
NotImplemented(String),
/// An agent with this ID already exists.
#[error("Agent {0} already exists")]
AgentAlreadyExists(String),
/// Failed to create an agent.
#[error("Failed to create agent {0}")]
AgentCreationFailed(String),
/// Agent with the specified ID was not found.
#[error("Agent {0} not found")]
AgentNotFound(String),
/// Source agent in a connection was not found.
#[error("Source agent {0} not found")]
SourceAgentNotFound(String),
/// Duplicate ID detected.
#[error("Duplicate id: {0}")]
DuplicateId(String),
/// Connection source handle is empty.
#[error("Source handle is empty")]
EmptySourceHandle,
/// Connection target handle is empty.
#[error("Target handle is empty")]
EmptyTargetHandle,
/// A connection between these ports already exists.
#[error("Connection already exists")]
ConnectionAlreadyExists,
/// Connection with the specified ID was not found.
#[error("Connection {0} not found")]
ConnectionNotFound(String),
/// Preset with the specified name was not found.
#[error("Preset {0} not found")]
PresetNotFound(String),
/// Agent definition was not found.
#[error("Agent {0} definition not found")]
AgentDefinitionNotFound(String),
/// Agent message sender was not found.
#[error("Agent tx for {0} not found")]
AgentTxNotFound(String),
/// Failed to send a message to an agent.
#[error("Failed to send message: {0}")]
SendMessageFailed(String),
/// Serialization or deserialization error.
#[error("Failed to serialize/deserialize: {0}")]
SerializationError(String),
/// Message sender is not initialized.
#[error("Message sender not initialized")]
TxNotInitialized,
/// I/O error.
#[error("IO error: {0}")]
IoError(String),
/// JSON parsing error.
#[error("JSON parsing error: {0}")]
JsonParseError(String),
/// Invalid file extension (expected JSON).
#[error("Invalid file extension: expected JSON")]
InvalidFileExtension,
/// File name is empty.
#[error("Empty file name")]
EmptyFileName,
/// Failed to get file stem from path.
#[error("Failed to get file stem from path")]
FileSystemError,
/// Invalid configuration value.
#[error("Configuration error: {0}")]
InvalidConfig(String),
/// No configuration is available for this agent.
#[error("No configuration available")]
NoConfig,
/// Configuration key does not exist.
#[error("Unknown configuration: {0}")]
UnknownConfig(String),
/// No global configuration is available.
#[error("No global configuration available")]
NoGlobalConfig,
/// Port (pin) was not found.
#[error("Pin not found: {0}")]
PinNotFound(String),
/// Request was rejected because the provider rate limit was exceeded.
///
/// `retry_after` carries the provider's suggested wait duration when a
/// `Retry-After` header is present.
#[error("Rate limited: {message}")]
RateLimited {
message: String,
retry_after: Option<std::time::Duration>,
},
/// Provider is temporarily overloaded (e.g. HTTP 529).
#[error("Provider overloaded: {0}")]
Overloaded(String),
/// Request did not complete within the allotted time.
#[error("Request timed out: {0}")]
Timeout(String),
/// Request exceeded the model's context window.
#[error("Context overflow: {0}")]
ContextOverflow(String),
/// Operation was cancelled before completion.
#[error("Cancelled")]
Cancelled,
/// Generic agent error.
#[error("Agent error: {0}")]
Other(String),
}
impl AgentError {
/// Returns `true` for errors that are transient and may succeed on retry.
pub fn is_retryable(&self) -> bool {
matches!(
self,
Self::RateLimited { .. } | Self::Overloaded(_) | Self::Timeout(_)
)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn retryable_variants_are_retryable() {
assert!(
AgentError::RateLimited {
message: "slow down".into(),
retry_after: None,
}
.is_retryable()
);
assert!(AgentError::Overloaded("busy".into()).is_retryable());
assert!(AgentError::Timeout("deadline exceeded".into()).is_retryable());
}
#[test]
fn non_retryable_variants_are_not_retryable() {
assert!(!AgentError::ContextOverflow("too long".into()).is_retryable());
assert!(!AgentError::Cancelled.is_retryable());
assert!(!AgentError::InvalidValue("bad".into()).is_retryable());
assert!(!AgentError::IoError("disk full".into()).is_retryable());
}
}