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- User Guide
- Product Introduction
- Purchase Guide
- Getting Started
- User Guide
- Quota Management
- Managing Functions
- Web Function Management
- Log Management
- Concurrence Management
- Trigger Management
- A Custom Domain Name
- Version Management
- Alias Management
- Permission Management
- Managing Monitors and Alarms
- Network Configuration
- Layer Management
- Execution Configuration
- Extended Storage Management
- DNS Caching Configuration
- Resource Managed Mode Management
- Triggers
- Development Guide
- Developer Tools
- Code Development
- Web Framework Development
- Deploying Framework on Command Line
- Quickly Deploying Egg Framework
- Quickly Deploying Express Framework
- Quickly Deploying Flask Framework
- Quickly Deploying Koa Framework
- Quickly Deploying Laravel Framework
- Quickly Deploying Nest.js Framework
- Quickly Deploying Next.js Framework
- Quickly Deploying Nuxt.js Framework
- Quickly Deploying Django Framework
- Practical Tutorial
- Overview
- Solutions with Tencent Cloud Services
- Business Development
- ServerlessFramework Practices
- API Gateway
- TRTC Practices
- COS Practices
- CKafka Practice
- CLS
- CLB Practice
- MPS
- CDN
- CDWPG
- VOD
- SMS
- ES
- Scheduled Task
- Video Processing
- Success Stories
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Trigger APIs
- Function APIs
- CopyFunction
- Invoke
- UpdateFunctionConfiguration
- UpdateFunctionCode
- ListFunctions
- GetFunctionLogs
- GetFunction
- DeleteFunction
- CreateFunction
- PublishVersion
- ListVersionByFunction
- GetFunctionAddress
- DeleteAlias
- UpdateAlias
- ListAliases
- GetAlias
- CreateAlias
- PutTotalConcurrencyConfig
- PutReservedConcurrencyConfig
- PutProvisionedConcurrencyConfig
- GetReservedConcurrencyConfig
- GetProvisionedConcurrencyConfig
- DeleteReservedConcurrencyConfig
- DeleteProvisionedConcurrencyConfig
- UpdateFunctionEventInvokeConfig
- GetFunctionEventInvokeConfig
- InvokeFunction
- GetRequestStatus
- Namespace APIs
- Layer Management APIs
- Async Event Management APIs
- Other APIs
- Function and Layer Status Description
- Data Types
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- SDK Documentation
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- Glossary
Implementation Scenario
Note:
1. Two COS buckets must be used. If you use the same bucket as both source and target buckets, each thumbnail uploaded to the source bucket may trigger another object creation event that will invoke the function again and thus cause an infinite loop.
2. Make sure that the function and the COS bucket are in the same region.
In this tutorial, suppose that:
A user is going to upload a photo to a specific COS bucket.
You need to create a thumbnail for every image uploaded by the user.
The created thumbnails need to be stored in another COS bucket.
Implementation Overview
The implementation process of this function is as follows:
You create the event source mapping between the function and the COS buckets.
The user uploads an object to the source COS bucket (object creation event).
The COS bucket detects the object creation event.
COS invokes the function and passes the event data as parameters to the function, thus publishing the
cos:ObjectCreated:\\* event to the function.The SCF platform receives the invocation request and executes the function.
The function gets the bucket name and filename from the received event data, gets the file from the source bucket, uses the graphic database to create a thumbnail, and saves the thumbnail in the target bucket.
Note: after going through this tutorial, your account will have the following resources:
A SCF function used to create thumbnails.
Two COS buckets: the source bucket for storing uploaded original images and the target bucket for storing cropped images.
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