Proxy Callback Interface for Webhook Event Recovery
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Solution Overview
Problem
Webhooks are ephemeral, making it difficult to recover lost notification messages, debug clients with bugs, and handle burst notifications due to single endpoint limitations, and they often struggle with security due to firewall constraints.
Innovation Solution
A proxy server is introduced to manage callback notifications by storing records in a database, allowing clients to query for missed events and providing multiple callback endpoints, thus overcoming the limitations of traditional webhooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional webhooks are used with a single endpoint, then the system structure remains simple, but the system cannot handle burst notifications and lacks reliability for event recovery
Solution Approach 1:
A proxy server is introduced as an intermediary component between event sources and webhook endpoints. The proxy server receives webhook notifications, stores them in a database, and manages multiple endpoints, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The proxy server pre-stores webhook notification records in a database before they are needed. This allows clients to query and retrieve missed events later, enabling event recovery and debugging capabilities in advance rather than waiting for failures to occur.
2Loss of information
If webhook notifications are stored in a database with multiple endpoints, then event recovery and debugging become possible, but the system complexity increases
Solution Approach 1:
The proxy server performs multiple functions: receiving webhook notifications, storing them in a database, managing multiple endpoints, and enabling client queries. This multi-functional approach consolidates complexity into a single component rather than distributing it across multiple separate systems.
Solution Approach 2:
The proxy server creates and maintains copies of webhook notification records in a database. These copies preserve the original notification data, allowing clients to retrieve and analyze missed events without affecting the original webhook delivery mechanism.
3Reliability
If a single webhook endpoint is used, then the configuration is simple, but the system cannot provide redundancy and fails under firewall constraints
Solution Approach 1:
The webhook endpoint functionality is segmented into multiple independent endpoints managed by the proxy server. This segmentation allows the system to provide redundancy and bypass firewall constraints by using multiple paths, while the proxy server abstracts the complexity of managing these segments.
Solution Approach 2:
The proxy server acts as an intermediary that manages multiple endpoint configurations, handling the complexity of redundancy and firewall navigation. Clients interact with a single proxy interface while the proxy manages the underlying multiple endpoints, maintaining ease of operation while improving reliability.
Data Source
AI summary
In an example, a proxy server includes a proxy callback interface supporting a plurality of webhook channels, each channel of the plurality of webhook channels being identified by a respective webhook channel address. The proxy callback interface receives a webhook call, the webhook call including a specific webhook channel address identifying a specific webhook channel, and payload callback data. The proxy server also includes a database interface to store a callback record that includes the payload callback data in a proxy server database. The proxy server also includes a query interface to receive a callback query, the callback query identifying the specific webhook channel address. The query interface further identifies a plurality of callback records, associated with the specific webhook channel address, that were stored within the proxy server database subsequent to receipt of a previously-received callback query, and returns the plurality of callback records, responsive to the callback query.