greentic-component 0.5.2

High-level component loader and store for Greentic components
Documentation 
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use displaydoc::Display;

#[cfg(feature = "abi")]
use crate::abi::AbiError;
use crate::capabilities::CapabilityError;
#[cfg(feature = "describe")]
use crate::describe::DescribeError;
use crate::limits::LimitError;
#[cfg(feature = "loader")]
use crate::loader::LoadError;
use crate::manifest::ManifestError;
use crate::schema::SchemaIntrospectionError;
use crate::signing::SigningError;

#[derive(Debug, Display, thiserror::Error)]
pub enum ComponentError {
    /// manifest failure: {0}
    Manifest(#[from] ManifestError),
    /// schema introspection failure: {0}
    SchemaIntrospection(#[from] SchemaIntrospectionError),
    /// ABI failure: {0}
    #[cfg(feature = "abi")]
    Abi(#[from] AbiError),
    /// describe failure: {0}
    #[cfg(feature = "describe")]
    Describe(#[from] DescribeError),
    /// load failure: {0}
    #[cfg(feature = "loader")]
    Load(#[from] LoadError),
    /// capability failure: {0}
    Capability(#[from] CapabilityError),
    /// limit failure: {0}
    Limits(#[from] LimitError),
    /// signing failure: {0}
    Signing(#[from] SigningError),
    /// io failure: {0}
    Io(#[from] std::io::Error),
    /// doctor failure: {0}
    Doctor(String),
    /// operation schema empty: {component}/{operation} {direction} ({suggestion})
    SchemaQualityEmpty {
        component: String,
        operation: String,
        direction: &'static str,
        suggestion: String,
    },
}

impl ComponentError {
    pub fn code(&self) -> &'static str {
        match self {
            ComponentError::Manifest(_) => "manifest-invalid",
            ComponentError::SchemaIntrospection(_) => "schema-introspection",
            #[cfg(feature = "abi")]
            ComponentError::Abi(err) => match err {
                crate::abi::AbiError::WorldMismatch { .. } => "world-mismatch",
                crate::abi::AbiError::MissingWasiTarget => "wasi-target-missing",
                _ => "abi-error",
            },
            #[cfg(feature = "describe")]
            ComponentError::Describe(err) => match err {
                crate::describe::DescribeError::NotFound(_) => "describe-missing",
                crate::describe::DescribeError::Json { .. } => "describe-invalid",
                crate::describe::DescribeError::Io { .. } => "describe-io",
                crate::describe::DescribeError::Metadata(_) => "describe-metadata",
            },
            #[cfg(feature = "loader")]
            ComponentError::Load(_) => "component-load",
            ComponentError::Capability(_) => "capability-error",
            ComponentError::Limits(_) => "limits-error",
            ComponentError::Signing(_) => "hash-mismatch",
            ComponentError::Io(_) => "io-error",
            ComponentError::Doctor(_) => "doctor-failure",
            ComponentError::SchemaQualityEmpty { .. } => "E_OP_SCHEMA_EMPTY",
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn code_maps_key_error_variants_to_stable_strings() {
        assert_eq!(
            ComponentError::Doctor("oops".into()).code(),
            "doctor-failure"
        );
        assert_eq!(
            ComponentError::SchemaQualityEmpty {
                component: "demo".into(),
                operation: "run".into(),
                direction: "input",
                suggestion: "add fields".into(),
            }
            .code(),
            "E_OP_SCHEMA_EMPTY"
        );
        assert_eq!(
            ComponentError::Capability(CapabilityError::invalid("host.http", "denied")).code(),
            "capability-error"
        );
        assert_eq!(
            ComponentError::Signing(SigningError::HashMismatch {
                expected: "a".into(),
                found: "b".into(),
            })
            .code(),
            "hash-mismatch"
        );
    }

    #[test]
    fn code_distinguishes_abi_and_describe_subclasses() {
        #[cfg(feature = "abi")]
        {
            assert_eq!(
                ComponentError::Abi(AbiError::MissingWasiTarget).code(),
                "wasi-target-missing"
            );
        }
        #[cfg(feature = "describe")]
        {
            assert_eq!(
                ComponentError::Describe(DescribeError::NotFound("describe".into())).code(),
                "describe-missing"
            );
        }
        #[cfg(feature = "loader")]
        {
            assert_eq!(
                ComponentError::Load(LoadError::NotFound("demo".into())).code(),
                "component-load"
            );
        }
    }
}