Context Infof is a function provided by the Go App Engine that allows you to log structured information in your application logs via the context package. It is used to print formatted information to the log, with a context value associated with it.
// Import the log package import "google.golang.org/appengine/log"
func handler(w http.ResponseWriter, r *http.Request) { c := appengine.NewContext(r) log.Infof(c, "Here is some info for you: %v", someVariable) }
In this example, we import the log package from the app engine library and use the Infof function to log a formatted message with a context value. The context value is retrieved using the NewContext function from the app engine library.
Example 2:
Package library: "github.com/gorilla/handlers"
// Import the handlers package import "github.com/gorilla/handlers"
func handler(w http.ResponseWriter, r *http.Request) { c := appengine.NewContext(r) handlers.LoggingHandler(os.Stderr, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { log.Infof(c, "Here is some info for you: %v", someVariable) })).ServeHTTP(w, r) }
In this example, we use the LoggingHandler function from the handlers package to log a message with a context value. We pass in the os.Stderr output stream and a http.HandlerFunc with our Infof message. This logs a message to the console with the context value.
Overall, Context Infof is a simple and effective way to log structured information in your application's logs. It is part of the core app engine libraries and is designed to be easy to use and efficient.
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