# Packages
Package cache is a package that unifies the definition of caching, supporting both redis and local caching.
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Package dao is the data access object, the code for database operation is unified here.
Package database provides database client initialization.
Package ecode is the package that unifies the definition of http error codes or grpc error codes here.
Package handler is a package of http request processing business logic.
Package model contains the data models used in the application.
Package routers is a package dedicated to registering routes, and supports both manual route registration and automatic route registration.
Package rpcclient is the rpc client package, used to connect to grpc server, rich plugin support by default, such as service discovery, load balancing, link tracking and so on.
Package server is a package that holds the http or grpc service.
Package service A grpc server-side or client-side package that handles business logic.
Package types define the structure of request parameters and return results in this package.