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const { DynamoDBDocumentClient, PutCommand, GetCommand, QueryCommand, UpdateCommand, DeleteCommand } = require('@aws-sdk/lib-dynamodb');
const { v4: uuidv4 } = require('uuid');
/**
* EventStorage - Manages event data in DynamoDB
*
* Provides persistent storage for community events with automatic cleanup and reminder tracking.
* Uses DynamoDB for scalability and automatic TTL-based cleanup of old events.
*
* Storage design rationale:
* - DynamoDB provides serverless scaling for varying community sizes
* - TTL automatically removes old events without manual cleanup
* - Composite keys enable efficient querying by guild and time ranges
* - Document model allows flexible event metadata without schema changes
*/
class EventStorage {
constructor(tableName, region = 'us-west-2') {
// Create DynamoDB v3 client
const client = new DynamoDBClient({
region,
maxAttempts: 3,
requestTimeout: 30000
});
this.docClient = DynamoDBDocumentClient.from(client);
this.tableName = tableName || process.env.DYNAMODB_EVENTS_TABLE || 'discord-events-main';
console.log(`EventStorage initialized with table: ${this.tableName}`);
}
/**
* Create a new event
*/
async createEvent(guildId, eventData) {
const eventId = uuidv4();
const now = new Date().toISOString();
// Calculate TTL for automatic cleanup (30 days after event date)
// This prevents the table from growing indefinitely with historical events
const eventDate = new Date(eventData.eventDate);
const ttlDate = new Date(eventDate.getTime() + (30 * 24 * 60 * 60 * 1000));
const ttl = Math.floor(ttlDate.getTime() / 1000);
const event = {
guild_id: guildId,
event_id: eventId,
name: eventData.name,
description: eventData.description || '',
region: eventData.region,
location: eventData.location || '',
event_date: eventData.eventDate, // Should already be ISO string from EventManager validation
link: eventData.link || '',
created_by: eventData.createdBy,
created_at: now,
reminder_status: 'pending', // pending, week_sent, day_sent, completed
ttl: ttl
};
try {
console.log('Creating event in DynamoDB:', { eventId, name: event.name });
const command = new PutCommand({
TableName: this.tableName,
Item: event,
ConditionExpression: 'attribute_not_exists(event_id)' // Prevent overwrites
});
await this.docClient.send(command);
console.log('✅ Event created successfully in DynamoDB');
return event;
} catch (error) {
console.error('Error creating event in DynamoDB:', error);
throw new Error('Failed to create event');
}
}
/**
* Get event by ID
*/
async getEvent(guildId, eventId) {
try {
const command = new GetCommand({
TableName: this.tableName,
Key: {
guild_id: guildId,
event_id: eventId
}
});
const result = await this.docClient.send(command);
return result.Item || null;
} catch (error) {
console.error(`Error getting event ${eventId}:`, error);
throw error;
}
}
/**
* Get events by region
*/
async getEventsByRegion(guildId, region) {
try {
const command = new QueryCommand({
TableName: this.tableName,
IndexName: 'region-index',
KeyConditionExpression: 'guild_id = :guildId AND #region = :region',
ExpressionAttributeNames: {
'#region': 'region'
},
ExpressionAttributeValues: {
':guildId': guildId,
':region': region
},
ScanIndexForward: true // Sort by range key ascending
});
const result = await this.docClient.send(command);
return result.Items || [];
} catch (error) {
console.error(`Error getting events for region ${region}:`, error);
return [];
}
}
/**
* Get upcoming events for reminders (next 7 days)
*/
async getUpcomingEvents(guildId) {
try {
const now = new Date().toISOString();
const weekFromNow = new Date(Date.now() + (7 * 24 * 60 * 60 * 1000)).toISOString();
const command = new QueryCommand({
TableName: this.tableName,
IndexName: 'date-index',
KeyConditionExpression: 'guild_id = :guildId AND event_date BETWEEN :now AND :weekFromNow',
ExpressionAttributeValues: {
':guildId': guildId,
':now': now,
':weekFromNow': weekFromNow
}
});
const result = await this.docClient.send(command);
return result.Items || [];
} catch (error) {
console.error('Error getting upcoming events:', error);
return [];
}
}
/**
* Get all future events (no time limit) - for command listings
*/
async getAllUpcomingEvents(guildId, limit = 50) {
try {
const now = new Date().toISOString();
const command = new QueryCommand({
TableName: this.tableName,
IndexName: 'date-index',
KeyConditionExpression: 'guild_id = :guildId AND event_date >= :now',
ExpressionAttributeValues: {
':guildId': guildId,
':now': now
},
Limit: limit,
ScanIndexForward: true // Chronological order (earliest first)
});
const result = await this.docClient.send(command);
return result.Items || [];
} catch (error) {
console.error('Error getting all upcoming events:', error);
return [];
}
}
/**
* Update event reminder status
*/
async updateReminderStatus(guildId, eventId, status) {
try {
const command = new UpdateCommand({
TableName: this.tableName,
Key: {
guild_id: guildId,
event_id: eventId
},
UpdateExpression: 'SET reminder_status = :status, updated_at = :now',
ExpressionAttributeValues: {
':status': status,
':now': new Date().toISOString()
}
});
await this.docClient.send(command);
console.log(`Updated reminder status for event ${eventId}: ${status}`);
} catch (error) {
console.error(`Error updating reminder status for event ${eventId}:`, error);
throw error;
}
}
/**
* Delete event
*/
async deleteEvent(guildId, eventId) {
try {
const command = new DeleteCommand({
TableName: this.tableName,
Key: {
guild_id: guildId,
event_id: eventId
}
});
await this.docClient.send(command);
console.log(`Deleted event ${eventId}`);
} catch (error) {
console.error(`Error deleting event ${eventId}:`, error);
throw error;
}
}
/**
* Get all events for guild (with pagination)
*/
async getAllEvents(guildId, limit = 50, lastEvaluatedKey = null) {
try {
const queryParams = {
TableName: this.tableName,
KeyConditionExpression: 'guild_id = :guildId',
ExpressionAttributeValues: {
':guildId': guildId
},
Limit: limit,
ScanIndexForward: false // Most recent first
};
// Only add ExclusiveStartKey if it's not null
if (lastEvaluatedKey) {
queryParams.ExclusiveStartKey = lastEvaluatedKey;
}
const command = new QueryCommand(queryParams);
const result = await this.docClient.send(command);
return {
events: result.Items || [],
lastEvaluatedKey: result.LastEvaluatedKey
};
} catch (error) {
console.error('Error getting all events:', error);
return { events: [], lastEvaluatedKey: null };
}
}
/**
* Get upcoming events for a specific region (next 3, includes events up to 1h after start)
*/
async getUpcomingEventsByRegion(guildId, region, limit = 3) {
try {
// Show events up to 1 hour after they started
const cutoffTime = new Date(Date.now() - (1 * 60 * 60 * 1000)).toISOString();
// Use date-index to efficiently query by date range, then filter by region
const command = new QueryCommand({
TableName: this.tableName,
IndexName: 'date-index',
KeyConditionExpression: 'guild_id = :guildId AND event_date >= :cutoffTime',
FilterExpression: '#region = :region',
ExpressionAttributeNames: {
'#region': 'region'
},
ExpressionAttributeValues: {
':guildId': guildId,
':region': region,
':cutoffTime': cutoffTime
},
ScanIndexForward: true // Earliest first
});
const result = await this.docClient.send(command);
const items = result.Items || [];
// Sort by event_date and limit to requested number
return items
.sort((a, b) => a.event_date.localeCompare(b.event_date))
.slice(0, limit);
} catch (error) {
console.error(`Error getting upcoming events for region ${region}:`, error);
return [];
}
}
/**
* Get upcoming events for a specific location (next 3, includes events up to 1h after start)
*/
async getUpcomingEventsByLocation(guildId, location, limit = 3) {
try {
// Show events up to 1 hour after they started
const cutoffTime = new Date(Date.now() - (1 * 60 * 60 * 1000)).toISOString();
// Use date-index to efficiently query by date range, then filter by location
const command = new QueryCommand({
TableName: this.tableName,
IndexName: 'date-index',
KeyConditionExpression: 'guild_id = :guildId AND event_date >= :cutoffTime',
FilterExpression: '#location = :location',
ExpressionAttributeNames: {
'#location': 'location'
},
ExpressionAttributeValues: {
':guildId': guildId,
':location': location,
':cutoffTime': cutoffTime
},
ScanIndexForward: true
});
const result = await this.docClient.send(command);
// Sort by event date since we can't use an index for location + date
const sortedEvents = (result.Items || []).sort((a, b) =>
new Date(a.event_date) - new Date(b.event_date)
);
return sortedEvents.slice(0, limit);
} catch (error) {
console.error(`Error getting upcoming events for location ${location}:`, error);
return [];
}
}
}
module.exports = EventStorage; |