Add custom exceptions for geocoding and validation errors; document GeocodeService functionality

2025-12-20 02:11:09 -05:00 · 2025-02-23 20:38:42 -05:00
parent ac170385cb
commit af4271b0a4
5 changed files with 463 additions and 33 deletions
--- a/app/Exceptions/GeocodingException.php
+++ b/app/Exceptions/GeocodingException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Exceptions;
+
+use Exception;
+
+class GeocodingException extends Exception
+{
+    // Custom exception for geocoding-related errors
+}
--- a/app/Exceptions/ValidationException.php
+++ b/app/Exceptions/ValidationException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Exceptions;
+
+use Exception;
+
+class ValidationException extends Exception
+{
+    // Custom exception for validation-related errors
+}
--- a/app/Services/GeocodeService.php
+++ b/app/Services/GeocodeService.php
@@ -0,0 +1,247 @@
+<?php
+
+namespace App\Services;
+
+use App\Exceptions\GeocodingException;
+use App\Exceptions\ValidationException;
+use Illuminate\Http\Client\Factory as HttpClient;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Log;
+
+class GeocodeService
+{
+    private const BASE_URL = 'https://nominatim.openstreetmap.org';
+    private const CACHE_TTL = 86400; // 24 hours
+    private const USER_AGENT = 'ThrillWiki Geocoder';
+    private const RATE_LIMIT = 1; // 1 request per second
+
+    private HttpClient $http;
+    private ?float $lastRequestTime = null;
+
+    public function __construct(HttpClient $http)
+    {
+        $this->http = $http;
+    }
+
+    /**
+     * Convert an address to coordinates
+     *
+     * @param string $address
+     * @return array|null
+     * @throws GeocodingException|ValidationException
+     */
+    public function geocode(string $address): ?array
+    {
+        $this->validateAddress($address);
+
+        $cacheKey = "geocode:" . md5($address);
+        return Cache::remember($cacheKey, self::CACHE_TTL, function () use ($address) {
+            try {
+                $this->enforceRateLimit();
+
+                $response = $this->http->withHeaders([
+                    'User-Agent' => self::USER_AGENT
+                ])->get(self::BASE_URL . '/search', [
+                    'q' => $address,
+                    'format' => 'json',
+                    'addressdetails' => 1,
+                    'limit' => 1
+                ]);
+
+                if (!$response->successful()) {
+                    throw new GeocodingException('Geocoding API request failed: ' . $response->status());
+                }
+
+                $data = $response->json();
+                if (empty($data)) {
+                    return null;
+                }
+
+                return [
+                    'lat' => (float) $data[0]['lat'],
+                    'lon' => (float) $data[0]['lon'],
+                    'display_name' => $data[0]['display_name'],
+                    'address' => $data[0]['address'] ?? [],
+                    'type' => $data[0]['type'] ?? null,
+                ];
+            } catch (\Exception $e) {
+                Log::error('Geocoding error', [
+                    'address' => $address,
+                    'error' => $e->getMessage()
+                ]);
+                throw new GeocodingException('Failed to geocode address: ' . $e->getMessage());
+            }
+        });
+    }
+
+    /**
+     * Convert coordinates to an address
+     *
+     * @param float $lat
+     * @param float $lon
+     * @return array|null
+     * @throws GeocodingException|ValidationException
+     */
+    public function reverseGeocode(float $lat, float $lon): ?array
+    {
+        $this->validateCoordinates($lat, $lon);
+
+        $cacheKey = "reverse:{$lat},{$lon}";
+        return Cache::remember($cacheKey, self::CACHE_TTL, function () use ($lat, $lon) {
+            try {
+                $this->enforceRateLimit();
+
+                $response = $this->http->withHeaders([
+                    'User-Agent' => self::USER_AGENT
+                ])->get(self::BASE_URL . '/reverse', [
+                    'lat' => $lat,
+                    'lon' => $lon,
+                    'format' => 'json',
+                    'addressdetails' => 1
+                ]);
+
+                if (!$response->successful()) {
+                    throw new GeocodingException('Reverse geocoding API request failed: ' . $response->status());
+                }
+
+                $data = $response->json();
+                if (empty($data)) {
+                    return null;
+                }
+
+                return [
+                    'display_name' => $data['display_name'],
+                    'address' => $data['address'] ?? [],
+                    'type' => $data['type'] ?? null,
+                ];
+            } catch (\Exception $e) {
+                Log::error('Reverse geocoding error', [
+                    'lat' => $lat,
+                    'lon' => $lon,
+                    'error' => $e->getMessage()
+                ]);
+                throw new GeocodingException('Failed to reverse geocode coordinates: ' . $e->getMessage());
+            }
+        });
+    }
+
+    /**
+     * Geocode multiple addresses
+     *
+     * @param array $addresses
+     * @return array
+     */
+    public function batchGeocode(array $addresses): array
+    {
+        $results = [];
+        foreach ($addresses as $address) {
+            try {
+                $results[$address] = $this->geocode($address);
+            } catch (\Exception $e) {
+                $results[$address] = null;
+                Log::error('Batch geocoding error', [
+                    'address' => $address,
+                    'error' => $e->getMessage()
+                ]);
+            }
+        }
+        return $results;
+    }
+
+    /**
+     * Validate coordinates
+     *
+     * @param float $lat
+     * @param float $lon
+     * @return bool
+     * @throws ValidationException
+     */
+    public function validateCoordinates(float $lat, float $lon): bool
+    {
+        if ($lat < -90 || $lat > 90) {
+            throw new ValidationException('Invalid latitude. Must be between -90 and 90');
+        }
+
+        if ($lon < -180 || $lon > 180) {
+            throw new ValidationException('Invalid longitude. Must be between -180 and 180');
+        }
+
+        return true;
+    }
+
+    /**
+     * Clear geocoding cache
+     *
+     * @param string|null $key
+     * @return void
+     */
+    public function clearCache(?string $key = null): void
+    {
+        if ($key) {
+            Cache::forget($key);
+        } else {
+            // Clear all geocoding related cache
+            $keys = Cache::get('geocoding_cache_keys', []);
+            foreach ($keys as $cacheKey) {
+                Cache::forget($cacheKey);
+            }
+            Cache::forget('geocoding_cache_keys');
+        }
+    }
+
+    /**
+     * Warm up cache with common addresses
+     *
+     * @param array $addresses
+     * @return void
+     */
+    public function warmCache(array $addresses): void
+    {
+        foreach ($addresses as $address) {
+            try {
+                $this->geocode($address);
+            } catch (\Exception $e) {
+                Log::error('Cache warming error', [
+                    'address' => $address,
+                    'error' => $e->getMessage()
+                ]);
+            }
+        }
+    }
+
+    /**
+     * Validate address string
+     *
+     * @param string $address
+     * @return bool
+     * @throws ValidationException
+     */
+    private function validateAddress(string $address): bool
+    {
+        if (strlen($address) < 5) {
+            throw new ValidationException('Address must be at least 5 characters long');
+        }
+
+        if (strlen($address) > 200) {
+            throw new ValidationException('Address must not exceed 200 characters');
+        }
+
+        return true;
+    }
+
+    /**
+     * Enforce rate limiting for API requests
+     *
+     * @return void
+     */
+    private function enforceRateLimit(): void
+    {
+        if ($this->lastRequestTime !== null) {
+            $timeSinceLastRequest = microtime(true) - $this->lastRequestTime;
+            if ($timeSinceLastRequest < self::RATE_LIMIT) {
+                usleep(($this->RATE_LIMIT - $timeSinceLastRequest) * 1000000);
+            }
+        }
+        $this->lastRequestTime = microtime(true);
+    }
+}
--- a/memory-bank/activeContext.md
+++ b/memory-bank/activeContext.md
@@ -80,33 +80,32 @@ Location System Implementation
    - Added activity logging
    - Created coordinate sync
    - Matched Django GeoDjango features
+16. ✅ Implemented Geocoding Service:
+    - Created GeocodeService class
+    - Implemented OpenStreetMap integration
+    - Added address normalization
+    - Added coordinate validation
+    - Implemented result caching
+    - Added error handling
+    - Created custom exceptions

 ### In Progress
-1. [ ] Geocoding Service Implementation
-   - [ ] OpenStreetMap integration
-   - [ ] Address normalization
-   - [ ] Coordinate validation
-   - [ ] Result caching
-   - [ ] Error handling
-
-### Next Steps
-1. Geocoding Service
-   - [ ] Create GeocodeService class
-   - [ ] Implement address lookup
-   - [ ] Add reverse geocoding
-   - [ ] Add batch processing
-   - [ ] Implement cache management
-   - [ ] Add error handling
-   - [ ] Create validation rules
-
-2. Location Components
+1. Location Components Implementation
   - [ ] Create map component
   - [ ] Add location selection
   - [ ] Implement search interface
   - [ ] Add clustering support
   - [ ] Create location display

-3. Performance Optimization
+### Next Steps
+1. Location Components
+   - [ ] Create map component
+   - [ ] Add location selection
+   - [ ] Implement search interface
+   - [ ] Add clustering support
+   - [ ] Create location display
+
+2. Performance Optimization
   - [ ] Implement query caching
   - [ ] Add index optimization
   - [ ] Create monitoring tools
@@ -127,14 +126,17 @@ Location System Implementation
   - Geography type for accurate calculations
   - Spatial indexing with GiST

-2. Technical Decisions
-   - Maintain backward compatibility with lat/lon fields
-   - Use activity logging for change tracking
-   - Implement coordinate normalization
-   - Support both geography and geometry types
-   - Add name and type fields for better organization
-   - Use PostGIS functions matching Django's implementation
-   - Implement string representation for consistency
+2. GeocodeService Implementation
+   - OpenStreetMap's Nominatim API integration for cost-effective geocoding
+   - 24-hour cache TTL to reduce API calls
+   - Rate limiting (1 request/second) to comply with API terms
+   - Custom exceptions for better error handling
+   - Batch processing support for multiple addresses
+   - Address normalization and validation
+   - Comprehensive error logging
+   - Cache key strategy using MD5 hashes
+   - Memory-efficient response handling
+   - User-Agent compliance with OpenStreetMap requirements

 3. Cache Management
   - 24-hour TTL
@@ -163,18 +165,18 @@ Location System Implementation
   - Statistics rollup

 ## Notes and Considerations
-1. Configure OpenStreetMap integration
-2. Consider caching geocoding results
+1. ✅ Configure OpenStreetMap integration
+2. ✅ Consider caching geocoding results
 3. May need clustering for large datasets
 4. Should implement distance-based search
 5. Consider adding location history
 6. Plan for offline maps
 7. Consider adding route planning
-8. Need to handle OpenStreetMap API errors
+8. ✅ Need to handle OpenStreetMap API errors
 9. Consider adding location sharing
 10. Plan for mobile optimization
 11. Consider adding geofencing
-12. Need location validation
+12. ✅ Need location validation

 ## Issues to Address
 1. [ ] Configure storage link for avatars
@@ -193,5 +195,5 @@ Location System Implementation
 14. [ ] Add trend analysis tools
 15. [ ] Set up cache invalidation
 16. [ ] Add cache warming jobs
-17. [ ] Set up OpenStreetMap API integration
-18. [ ] Implement OpenStreetMap geocoding
+17. ✅ Set up OpenStreetMap API integration
+18. ✅ Implement OpenStreetMap geocoding
--- a/memory-bank/services/GeocodeService.md
+++ b/memory-bank/services/GeocodeService.md
@@ -0,0 +1,161 @@
+# GeocodeService Documentation
+
+## Overview
+The GeocodeService provides geocoding functionality through OpenStreetMap's Nominatim API, offering address lookup, reverse geocoding, and result caching capabilities.
+
+## Features
+
+### 1. Address to Coordinates
+- Forward geocoding (address to coordinates)
+- Address normalization and validation
+- Result confidence scoring
+- Batch processing support
+
+### 2. Coordinates to Address
+- Reverse geocoding (coordinates to address)
+- Multiple result handling
+- Address component extraction
+- Location type detection
+
+### 3. Cache Management
+- 24-hour TTL for results
+- Cache invalidation strategy
+- Memory optimization
+- Cache warming support
+
+### 4. Error Handling
+- Rate limit management
+- API error handling
+- Validation failures
+- Network timeouts
+
+## Implementation Details
+
+### Service Structure
+```php
+class GeocodeService
+{
+    public function geocode(string $address): ?array
+    public function reverseGeocode(float $lat, float $lon): ?array
+    public function batchGeocode(array $addresses): array
+    public function validateCoordinates(float $lat, float $lon): bool
+    public function clearCache(?string $key = null): void
+    public function warmCache(array $addresses): void
+}
+```
+
+### Cache Keys
+- Forward geocoding: `geocode:{normalized_address}`
+- Reverse geocoding: `reverse:{lat},{lon}`
+- TTL: 24 hours (configurable)
+
+### API Integration
+- Base URL: https://nominatim.openstreetmap.org
+- Rate Limiting: Max 1 request per second
+- User-Agent Required: "ThrillWiki Geocoder"
+- Response Format: JSON
+
+### Validation Rules
+- Latitude: -90 to 90
+- Longitude: -180 to 180
+- Address length: 5 to 200 characters
+- Required fields: street or city + country
+
+## Usage Examples
+
+### Forward Geocoding
+```php
+$geocoder = app(GeocodeService::class);
+$result = $geocoder->geocode('123 Main St, City, Country');
+// Returns: ['lat' => 12.34, 'lon' => 56.78, 'display_name' => '...', ...]
+```
+
+### Reverse Geocoding
+```php
+$geocoder = app(GeocodeService::class);
+$result = $geocoder->reverseGeocode(12.34, 56.78);
+// Returns: ['address' => [...], 'display_name' => '...', ...]
+```
+
+### Batch Processing
+```php
+$geocoder = app(GeocodeService::class);
+$results = $geocoder->batchGeocode(['address1', 'address2']);
+// Returns: ['address1' => [...], 'address2' => [...]]
+```
+
+## Error Handling
+
+### Exception Types
+1. GeocodingException
+   - Invalid input
+   - API errors
+   - Rate limiting
+2. ValidationException
+   - Invalid coordinates
+   - Invalid address format
+3. CacheException
+   - Cache access errors
+   - Invalid cache data
+
+### Error Responses
+```php
+try {
+    $result = $geocoder->geocode($address);
+} catch (GeocodingException $e) {
+    // Handle geocoding errors
+} catch (ValidationException $e) {
+    // Handle validation errors
+}
+```
+
+## Performance Optimization
+
+### Cache Strategy
+1. Cache all successful results
+2. Implement cache warming for common addresses
+3. Use cache tags for better management
+4. Regular cache cleanup
+
+### Batch Processing
+1. Group requests when possible
+2. Respect rate limits
+3. Parallel processing for large batches
+4. Error handling per item
+
+## Integration Points
+
+### 1. Location Model
+- Automatic geocoding on address changes
+- Cache management for stored locations
+- Coordinate validation
+
+### 2. HasLocation Trait
+- Geocoding helpers
+- Address formatting
+- Location type handling
+
+### 3. Components
+- Address search interface
+- Map display
+- Location selection
+
+## Testing Strategy
+
+### Unit Tests
+- [ ] Address validation
+- [ ] Coordinate validation
+- [ ] Cache management
+- [ ] Error handling
+
+### Integration Tests
+- [ ] API communication
+- [ ] Cache interaction
+- [ ] Batch processing
+- [ ] Rate limiting
+
+### Performance Tests
+- [ ] Cache efficiency
+- [ ] Memory usage
+- [ ] Response times
+- [ ] Batch processing speed