lht 2.0.52

Lakehouse Tools for Snowflake and Salesforce

Lake House Tools (LHT) - Salesforce & Snowflake Integration

Bring Salesforce into the fold of your data cloud. LHT is a robust Python library that makes it really easy to extract data from Salesforce and reverse-extract your updates and transformations back into Salesforce. LHT uses Salesforce Bulk API 2.0 for all data synchronizations, providing efficient and consistent data extraction regardless of data volume.

🚀 Features

Intelligent Synchronization

• Bulk API 2.0: All syncs use Salesforce Bulk API 2.0 for efficient data extraction
• Incremental Sync: Smart detection of changed records since last sync based on LastModifiedDate
• Full Sync: Complete data synchronization for first-time syncs

Core Capabilities

• Salesforce Bulk API 2.0: Full support for bulk operations
• Snowflake Integration: Native Snowpark support
• Data Type Mapping: Automatic Salesforce to Snowflake type conversion
• Error Handling: Comprehensive error management and recovery
• Performance Optimization: Efficient processing for large datasets

📦 Installation

pip install lht

🎯 Quick Start

Prerequisites

1. Salesforce Setup

Option A: Developer Org (Recommended for Testing)

• Sign up for a Salesforce Developer Org (free)
• Important: Developer Pro or above is preferred for testing LHT
• Do NOT use your production Salesforce instance or production data

Option B: Trial Org

• Sign up for a Salesforce Trial (free)
• Choose a trial that includes the features you want to test

Option C: Sandbox

• If you have a Developer Pro+ license, create a sandbox from your production org
• Never test LHT in production

⚠️ Critical Requirements:

• Administrative access to the Salesforce instance

🔧 OAuth2.0 Setup Required:

1. Configure a Connected App for the OAuth2.0 Client Credentials Flow
   • Detailed Connected App Setup Instructions
   • Callback URL: Enter https://localhost/callback (not used in this flow but required)
   • Scopes: Add "Full" scopes for testing (modify for production use)
2. Retrieve Credentials: Once configured, get the Client ID and Client Secret and store them securely
3. Get Your Domain: From Setup, search for "My Domain" and copy the subdomain (everything before '.my.salesforce.com')
   • Note: Sandbox instances will include 'sandbox' in the subdomain
4. Store Securely: Keep Client ID, Client Secret, and subdomain together - you'll need them for LHT configuration

🚨 Salesforce Limitations: Since Salesforce was never really architected to deal with any meaningful amount of data, there will be limitations on what you can do:

• API rate limits: 15,000 API calls per 24-hour period (Enterprise), 100,000 (Unlimited)
• Bulk API limits: 10,000 records per batch, 10 concurrent jobs
• Query limits: SOQL queries limited to 50,000 records
• Storage limits: Varies by org type and edition
  • Salesforce Storage Limits
  • Sandbox Storage Limits

This is why we introduced LHT - to bridge these limitations and provide robust data integration capabilities.

2. Snowflake Setup

Free Trial Registration:

• Sign up for a Snowflake free trial (free)
• Choose a cloud provider (AWS, Azure, or GCP)
• Select a region close to your Salesforce org

⚠️ Critical Requirements:

• Account Admin privileges (required for initial setup)
• Security Admin privileges (required for user and role management)
• Database creation permissions
• Warehouse creation permissions

🔑 Minimum Snowflake Roles Needed:

-- Account Admin (automatically granted)
-- Security Admin
-- Database Admin
-- Warehouse Admin

Basic Intelligent Sync

from lht.salesforce.intelligent_sync import sync_sobject_intelligent

# Sync Account object intelligently
result = sync_sobject_intelligent(
    session=session,
    access_info=access_info,
    sobject="Account",
    schema="RAW",
    table="ACCOUNTS",
    match_field="ID"
)

print(f"Synced {result['actual_records']} records using {result['sync_method']}")

🔧 How It Works

Decision Matrix

The system automatically selects the optimal sync method:

Scenario	Records	Method	Description
First-time sync	< 1,000	regular_api_full	Use regular Salesforce API
First-time sync	1,000+	bulk_api_full	Use Bulk API 2.0
Incremental sync	< 1,000	regular_api_incremental	Use regular API with merge logic
Incremental sync	1,000+	bulk_api_incremental	Use Bulk API 2.0 with merge logic

Incremental Sync Logic

1. Check Table Existence: Determines if target table exists
2. Get Last Modified Date: Queries MAX(LASTMODIFIEDDATE) from existing table
3. Estimate Record Count: Counts records modified since last sync
4. Choose Method: Selects appropriate sync method based on count
5. Execute Sync: Runs the chosen method

📚 Documentation

• Intelligent Sync Guide: Comprehensive guide to the intelligent sync system
• Examples: Complete working examples

🔄 Sync Methods

1. Regular API Methods

• Use cases: Small datasets (< 1,000 records)
• Advantages: Fast for small datasets, real-time processing
• Disadvantages: API rate limits, memory intensive

2. Bulk API 2.0 Methods

• Use cases: Medium to large datasets (1,000+ records)
• Advantages: Handles large datasets efficiently, built-in retry logic
• Disadvantages: Requires job management, asynchronous processing

🛠️ Configuration

Custom Thresholds

from lht.salesforce.intelligent_sync import IntelligentSync

sync_system = IntelligentSync(session, access_info)
sync_system.BULK_API_THRESHOLD = 5000    # Use Bulk API for 5K+ records

Environment Setup

# Set appropriate warehouse size
session.sql("USE WAREHOUSE LARGE_WH").collect()

📊 Return Values

Sync functions return detailed information:

{
    'sobject': 'Account',
    'target_table': 'RAW.ACCOUNTS',
    'sync_method': 'bulk_api_incremental',
    'estimated_records': 1500,
    'actual_records': 1487,
    'sync_duration_seconds': 45.23,
    'last_modified_date': Timestamp('2024-01-15 10:30:00'),
    'sync_timestamp': Timestamp('2024-01-16 14:20:00'),
    'success': True,
    'error': None
}

🚨 Error Handling

The system includes comprehensive error handling for:

• Authentication errors
• Network issues
• Job failures
• Data errors

Errors are captured in the return value:

{
    'success': False,
    'error': 'Bulk API job failed with state: Failed',
    'records_processed': 0
}

🔧 Advanced Usage

Multiple Object Sync

objects_to_sync = [
    {"sobject": "Account", "table": "ACCOUNTS"},
    {"sobject": "Contact", "table": "CONTACTS"},
    {"sobject": "Opportunity", "table": "OPPORTUNITIES"}
]

results = []
for obj in objects_to_sync:
    result = sync_sobject_intelligent(
        session=session,
        access_info=access_info,
        sobject=obj['sobject'],
        schema="RAW",
        table=obj['table'],
        match_field="ID"
    )
    results.append(result)

Force Full Sync

# Useful for data refresh or after schema changes
result = sync_sobject_intelligent(
    session=session,
    access_info=access_info,
    sobject="Account",
    schema="RAW",
    table="ACCOUNTS",
    match_field="ID",
    force_full_sync=True  # Overwrites entire table
)

📈 Performance Considerations

Memory Usage

• Regular API: Loads all data in memory
• Bulk API: Processes in batches

Processing Time

• Small datasets (< 1K): Regular API fastest
• Medium to large datasets (1K+): Bulk API optimal

🤝 Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests
5. Submit a pull request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.