use thiserror::Error;
use std::path::PathBuf;
#[derive(Error, Debug)]
pub enum ShimmyError {
#[error("Model not found: {name}")]
ModelNotFound { name: String },
#[error("Model loading failed: {path}")]
ModelLoadError {
path: PathBuf,
#[source]
source: anyhow::Error,
},
#[error("Generation failed: {reason}")]
GenerationError { reason: String },
#[error("Invalid configuration: {field} = {value}")]
ConfigError { field: String, value: String },
#[error("Backend not available: {backend}")]
BackendNotAvailable { backend: String },
#[error("Template rendering failed: {template}")]
TemplateError {
template: String,
#[source]
source: Box<dyn std::error::Error + Send + Sync>,
},
#[error("Async runtime error")]
AsyncError(#[from] tokio::task::JoinError),
#[error("IO error")]
IoError(#[from] std::io::Error),
#[error("Serialization error")]
SerdeError(#[from] serde_json::Error),
}
pub type Result<T> = std::result::Result<T, ShimmyError>;
impl From<anyhow::Error> for ShimmyError {
fn from(err: anyhow::Error) -> Self {
ShimmyError::GenerationError {
reason: err.to_string()
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::error::Error as StdError;
use std::io::{Error as IoError, ErrorKind};
use anyhow::anyhow;
#[test]
fn test_model_not_found_error() {
let error = ShimmyError::ModelNotFound {
name: "test-model".to_string(),
};
assert_eq!(error.to_string(), "Model not found: test-model");
assert!(format!("{:?}", error).contains("ModelNotFound"));
assert!(format!("{:?}", error).contains("test-model"));
}
#[test]
fn test_model_load_error() {
let path = PathBuf::from("/path/to/model.bin");
let source_error = anyhow!("Failed to read file");
let error = ShimmyError::ModelLoadError {
path: path.clone(),
source: source_error,
};
assert_eq!(error.to_string(), "Model loading failed: /path/to/model.bin");
assert!(format!("{:?}", error).contains("ModelLoadError"));
assert!(format!("{:?}", error).contains("model.bin"));
assert!(error.source().is_some());
assert_eq!(error.source().unwrap().to_string(), "Failed to read file");
}
#[test]
fn test_generation_error() {
let error = ShimmyError::GenerationError {
reason: "Token limit exceeded".to_string(),
};
assert_eq!(error.to_string(), "Generation failed: Token limit exceeded");
assert!(format!("{:?}", error).contains("GenerationError"));
assert!(format!("{:?}", error).contains("Token limit exceeded"));
}
#[test]
fn test_config_error() {
let error = ShimmyError::ConfigError {
field: "temperature".to_string(),
value: "invalid".to_string(),
};
assert_eq!(error.to_string(), "Invalid configuration: temperature = invalid");
assert!(format!("{:?}", error).contains("ConfigError"));
assert!(format!("{:?}", error).contains("temperature"));
assert!(format!("{:?}", error).contains("invalid"));
}
#[test]
fn test_backend_not_available_error() {
let error = ShimmyError::BackendNotAvailable {
backend: "ollama".to_string(),
};
assert_eq!(error.to_string(), "Backend not available: ollama");
assert!(format!("{:?}", error).contains("BackendNotAvailable"));
assert!(format!("{:?}", error).contains("ollama"));
}
#[test]
fn test_template_error() {
let template_name = "chat_template".to_string();
let source_error: Box<dyn StdError + Send + Sync> =
Box::new(std::io::Error::new(ErrorKind::InvalidData, "Invalid template syntax"));
let error = ShimmyError::TemplateError {
template: template_name.clone(),
source: source_error,
};
assert_eq!(error.to_string(), "Template rendering failed: chat_template");
assert!(format!("{:?}", error).contains("TemplateError"));
assert!(format!("{:?}", error).contains("chat_template"));
assert!(error.source().is_some());
assert!(error.source().unwrap().to_string().contains("Invalid template syntax"));
}
#[test]
fn test_async_error_from_join_error() {
let rt = tokio::runtime::Runtime::new().unwrap();
let join_handle = rt.spawn(async {
panic!("Task panicked");
});
let join_error = rt.block_on(join_handle).unwrap_err();
let error = ShimmyError::AsyncError(join_error);
assert_eq!(error.to_string(), "Async runtime error");
assert!(format!("{:?}", error).contains("AsyncError"));
assert!(error.source().is_some());
}
#[test]
fn test_io_error_conversion() {
let io_error = IoError::new(ErrorKind::NotFound, "File not found");
let error = ShimmyError::IoError(io_error);
assert_eq!(error.to_string(), "IO error");
assert!(format!("{:?}", error).contains("IoError"));
assert!(error.source().is_some());
assert!(error.source().unwrap().to_string().contains("File not found"));
}
#[test]
fn test_io_error_from_conversion() {
let io_error = IoError::new(ErrorKind::PermissionDenied, "Permission denied");
let error: ShimmyError = io_error.into();
match error {
ShimmyError::IoError(_) => {},
_ => panic!("Expected IoError variant"),
}
assert_eq!(error.to_string(), "IO error");
assert!(error.source().is_some());
}
#[test]
fn test_serde_error_conversion() {
let json_str = r#"{"invalid": json syntax}"#;
let serde_error = serde_json::from_str::<serde_json::Value>(json_str).unwrap_err();
let error = ShimmyError::SerdeError(serde_error);
assert_eq!(error.to_string(), "Serialization error");
assert!(format!("{:?}", error).contains("SerdeError"));
assert!(error.source().is_some());
}
#[test]
fn test_serde_error_from_conversion() {
let invalid_json = r#"{"missing_quote: "value"}"#;
let serde_error = serde_json::from_str::<serde_json::Value>(invalid_json).unwrap_err();
let error: ShimmyError = serde_error.into();
match error {
ShimmyError::SerdeError(_) => {},
_ => panic!("Expected SerdeError variant"),
}
assert_eq!(error.to_string(), "Serialization error");
}
#[test]
fn test_anyhow_error_conversion() {
let anyhow_error = anyhow!("Something went wrong");
let error = ShimmyError::from(anyhow_error);
match &error {
ShimmyError::GenerationError { reason } => {
assert_eq!(reason, "Something went wrong");
},
_ => panic!("Expected GenerationError variant"),
}
assert_eq!(error.to_string(), "Generation failed: Something went wrong");
}
#[test]
fn test_anyhow_error_from_conversion() {
let anyhow_error = anyhow!("Custom error message");
let error: ShimmyError = anyhow_error.into();
match &error {
ShimmyError::GenerationError { reason } => {
assert_eq!(reason, "Custom error message");
},
_ => panic!("Expected GenerationError variant"),
}
}
#[test]
fn test_result_type_alias() {
fn returns_shimmy_result() -> Result<String> {
Ok("success".to_string())
}
fn returns_shimmy_error() -> Result<String> {
Err(ShimmyError::ModelNotFound {
name: "missing-model".to_string(),
})
}
assert!(returns_shimmy_result().is_ok());
assert_eq!(returns_shimmy_result().unwrap(), "success");
assert!(returns_shimmy_error().is_err());
let error = returns_shimmy_error().unwrap_err();
assert!(matches!(error, ShimmyError::ModelNotFound { .. }));
}
#[test]
fn test_error_debug_formatting() {
let errors = vec![
ShimmyError::ModelNotFound { name: "test".to_string() },
ShimmyError::GenerationError { reason: "failed".to_string() },
ShimmyError::ConfigError {
field: "field".to_string(),
value: "value".to_string()
},
ShimmyError::BackendNotAvailable { backend: "backend".to_string() },
];
for error in errors {
let debug_str = format!("{:?}", error);
assert!(!debug_str.is_empty());
assert!(debug_str.len() > 10); }
}
#[test]
fn test_error_display_formatting() {
let test_cases = vec![
(
ShimmyError::ModelNotFound { name: "llama".to_string() },
"Model not found: llama"
),
(
ShimmyError::GenerationError { reason: "timeout".to_string() },
"Generation failed: timeout"
),
(
ShimmyError::ConfigError {
field: "max_tokens".to_string(),
value: "-1".to_string()
},
"Invalid configuration: max_tokens = -1"
),
(
ShimmyError::BackendNotAvailable { backend: "openai".to_string() },
"Backend not available: openai"
),
];
for (error, expected_message) in test_cases {
assert_eq!(error.to_string(), expected_message);
}
}
#[test]
fn test_error_source_chain() {
let root_cause = anyhow!("Root cause error");
let model_error = ShimmyError::ModelLoadError {
path: PathBuf::from("test.bin"),
source: root_cause,
};
assert!(model_error.source().is_some());
assert_eq!(model_error.source().unwrap().to_string(), "Root cause error");
let io_error: Box<dyn StdError + Send + Sync> =
Box::new(IoError::new(ErrorKind::NotFound, "Template file not found"));
let template_error = ShimmyError::TemplateError {
template: "missing.template".to_string(),
source: io_error,
};
assert!(template_error.source().is_some());
assert!(template_error.source().unwrap().to_string().contains("Template file not found"));
}
#[test]
fn test_error_variants_exhaustiveness() {
let errors = vec![
ShimmyError::ModelNotFound { name: "test".to_string() },
ShimmyError::ModelLoadError {
path: PathBuf::from("test.bin"),
source: anyhow!("test error"),
},
ShimmyError::GenerationError { reason: "test".to_string() },
ShimmyError::ConfigError {
field: "test".to_string(),
value: "test".to_string(),
},
ShimmyError::BackendNotAvailable { backend: "test".to_string() },
ShimmyError::TemplateError {
template: "test".to_string(),
source: Box::new(IoError::new(ErrorKind::Other, "test")),
},
ShimmyError::IoError(IoError::new(ErrorKind::Other, "test")),
ShimmyError::SerdeError(serde_json::from_str::<i32>("invalid").unwrap_err()),
];
for error in errors {
match error {
ShimmyError::ModelNotFound { .. } => {},
ShimmyError::ModelLoadError { .. } => {},
ShimmyError::GenerationError { .. } => {},
ShimmyError::ConfigError { .. } => {},
ShimmyError::BackendNotAvailable { .. } => {},
ShimmyError::TemplateError { .. } => {},
ShimmyError::AsyncError(_) => {},
ShimmyError::IoError(_) => {},
ShimmyError::SerdeError(_) => {},
}
}
}
}