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// Plugin is the interface for plugins to micro. It differs from go-micro in that it's for
// the micro API, Web, Sidecar, CLI. It's a method of building middleware for the HTTP side.
type Plugin interface {
// Global Flags
Flags() []cli.Flag
// Sub-commands
Commands() []cli.Command
// Handle is the middleware handler for HTTP requests. We pass in
// the existing handler so it can be wrapped to create a call chain.
Handler() Handler
// Init called when command line args are parsed.
// The initialised cli.Context is passed in.
Init(*cli.Context) error
// Name of the plugin
String() string
}
// Manager is the plugin manager which stores plugins and allows them to be retrieved.
// This is used by all the components of micro.
type Manager interface {
Plugins() map[string]Plugin
Register(name string, plugin Plugin) error
}
// Handler is the plugin middleware handler which wraps an existing http.Handler passed in.
// Its the responsibility of the Handler to call the next http.Handler in the chain.
type Handler func(http.Handler) http.Handler如何使用它
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