appconfiguration 0.1.0-rc.0

The IBM Cloud App Configuration Rust SDK is used to perform feature flag and property evaluation based on the configuration on IBM Cloud App Configuration service.
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// (C) Copyright IBM Corp. 2024.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::collections::HashMap;

use crate::errors::{ConfigurationAccessError, Result};
use crate::models::{Configuration, Feature, Property, Segment};

#[derive(Debug, Default)]
pub(crate) struct ConfigurationSnapshot {
    pub(crate) features: HashMap<String, Feature>,
    pub(crate) properties: HashMap<String, Property>,
    pub(crate) segments: HashMap<String, Segment>,
}

impl ConfigurationSnapshot {
    pub fn get_feature(&self, feature_id: &str) -> Result<&Feature> {
        self.features.get(feature_id).ok_or_else(|| {
            ConfigurationAccessError::FeatureNotFound {
                feature_id: feature_id.to_string(),
            }
            .into()
        })
    }

    pub fn get_property(&self, property_id: &str) -> Result<&Property> {
        self.properties.get(property_id).ok_or_else(|| {
            ConfigurationAccessError::PropertyNotFound {
                property_id: property_id.to_string(),
            }
            .into()
        })
    }

    pub fn new(environment_id: &str, configuration: Configuration) -> Result<Self> {
        let environment = configuration
            .environments
            .into_iter()
            .find(|e| e.environment_id == environment_id)
            .ok_or(ConfigurationAccessError::EnvironmentNotFound {
                environment_id: environment_id.to_string(),
            })?;
        // FIXME: why not filtering for collection here?

        let mut features = HashMap::new();
        for feature in environment.features {
            features.insert(feature.feature_id.clone(), feature);
        }

        let mut properties = HashMap::new();
        for property in environment.properties {
            properties.insert(property.property_id.clone(), property);
        }

        let mut segments = HashMap::new();
        for segment in configuration.segments {
            segments.insert(segment.segment_id.clone(), segment.clone());
        }
        Ok(ConfigurationSnapshot {
            features,
            properties,
            segments,
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::errors::Error;
    use crate::models::tests::example_configuration_enterprise;
    use crate::models::Configuration;
    use rstest::*;

    #[rstest]
    fn test_filter_configurations(example_configuration_enterprise: Configuration) {
        let result =
            ConfigurationSnapshot::new("does_for_sure_not_exist", example_configuration_enterprise);
        assert!(result.is_err());

        assert!(matches!(
                result.unwrap_err(),
                Error::ConfigurationAccessError(ref e)
                if matches!(e, ConfigurationAccessError::EnvironmentNotFound { ref environment_id} if environment_id == "does_for_sure_not_exist")));
    }
}