drasi-source-mock 0.1.2

Mock source plugin for Drasi
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// Copyright 2025 The Drasi Authors.
//
// 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.

//! Configuration for the mock source.
//!
//! The mock source generates synthetic data for testing and development purposes.

use serde::{Deserialize, Serialize};

/// Mock source configuration
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct MockSourceConfig {
    /// Type of data to generate: "counter", "sensor", or "generic"
    #[serde(default = "default_data_type")]
    pub data_type: String,

    /// Interval between data generation in milliseconds
    #[serde(default = "default_interval_ms")]
    pub interval_ms: u64,
}

fn default_data_type() -> String {
    "generic".to_string()
}

fn default_interval_ms() -> u64 {
    5000
}

impl Default for MockSourceConfig {
    fn default() -> Self {
        Self {
            data_type: default_data_type(),
            interval_ms: default_interval_ms(),
        }
    }
}

impl MockSourceConfig {
    /// Valid data types for mock source.
    pub const VALID_DATA_TYPES: [&'static str; 3] = ["counter", "sensor", "generic"];

    /// Validate the configuration and return an error if invalid.
    ///
    /// # Errors
    ///
    /// Returns an error if:
    /// - Data type is not one of "counter", "sensor", or "generic"
    /// - Interval is 0 (would cause continuous generation without pause)
    pub fn validate(&self) -> anyhow::Result<()> {
        if !Self::VALID_DATA_TYPES.contains(&self.data_type.as_str()) {
            return Err(anyhow::anyhow!(
                "Validation error: data_type '{}' is not valid. \
                 Valid options are: counter, sensor, generic",
                self.data_type
            ));
        }

        if self.interval_ms == 0 {
            return Err(anyhow::anyhow!(
                "Validation error: interval_ms cannot be 0. \
                 Please specify a positive interval in milliseconds (minimum 1)"
            ));
        }

        Ok(())
    }
}