How to Manage Concurrent Customer Configuration Data with Incremental Updates and Avoid Data Loss?

Load Initial Data and Process Updates from Incremental Files

Problem Statement

This code manages a concurrent map that stores data for a customer configuration. During server startup, it loads data from specific files into the map. It also monitors for new files and updates the map with data from those files, clearing the old state.

The issue arises when the read method encounters an error. In this case, the entire map is cleared, leaving it empty even though the previous configuration data should be preserved.

Solution

The proposed solution simplifies the data management process:

• Create a CustomerConfig struct: This struct holds the data to be cached as a "snapshot."
• Define a loadConfig function: This function loads the configuration from the desired files.
• Establish a ConfigCache struct: This cache manager stores the current configuration and provides access to it. It ensures safe concurrent access and has the ability to refresh the cached configuration.
• Implement a refresher() function: This goroutine periodically checks for changes and loads new configurations if detected. It respects closeCh to halt if requested.
• Implement a GetConfig() method: This method provides read-only access to the current configuration.

Implementation Details

<code class="go">type CustomerConfig struct {
    Data map[string]bool

    // Add other properties if needed
    LoadedAt time.Time
}

func loadConfig() (*CustomerConfig, error) {
    cfg := &CustomerConfig{
        Data:     map[string]bool{},
        LoadedAt: time.Now(),
    }

    // Implement the file loading logic here
    // If an error occurs, return it

    // If successful, return the config
    return cfg, nil
}

type ConfigCache struct {
    configMu sync.RWMutex
    config   *CustomerConfig
    closeCh  chan struct{}
}

func NewConfigCache() (*ConfigCache, error) {
    cfg, err := loadConfig()
    if err != nil {
        return nil, fmt.Errorf("loading initial config failed: %w", err)
    }

    cc := &ConfigCache{
        config:  cfg,
        closeCh: make(chan struct{}),
    }

    // Launch goroutine to refresh config
    go cc.refresher()

    return cc, nil
}

func (cc *ConfigCache) refresher() {
    ticker := time.NewTicker(1 * time.Minute) // Every minute
    defer ticker.Stop()

    for {
        select {
        case <-ticker.C:
            // Implement the logic to detect changes
            changes := false
            if !changes {
                continue
            }

            cfg, err := loadConfig()
            if err != nil {
                log.Printf("Failed to load config: %v", err)
                continue
            }

            cc.configMu.Lock()
            cc.config = cfg
            cc.configMu.Unlock()

        case <-cc.closeCh:
            return
        }
    }
}

func (cc *ConfigCache) Stop() {
    close(cc.closeCh)
}

func (cc *ConfigCache) GetConfig() *CustomerConfig {
    cc.configMu.RLock()
    defer cc.configMu.RUnlock()
    return cc.config
}</code>

Usage

<code class="go">// Initialize the cache
cc, err := NewConfigCache()
if err != nil {
    // Handle the error
}

// Get the current configuration when needed
cfg := cc.GetConfig()

// Remember to stop the cache manager when appropriate
cc.Stop()</code>

This solution prevents the issue of losing the previous configuration and simplifies the handling of configuration updates.

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