Created
July 23, 2019 06:54
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ECS Demo App
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package main | |
import ( | |
"net/http" | |
"encoding/json" | |
"math/rand" | |
"os" | |
"os/signal" | |
"syscall" | |
"time" | |
"context" | |
"log" | |
"github.com/gorilla/mux" | |
) | |
type Dog struct { | |
Name string `json:"name"` | |
Age int `json:"age"` | |
Toy *Toy `json:"toy,omitempty"` | |
} | |
type Toy struct { | |
Name string `json:"name"` | |
Color string `json:"color"` | |
} | |
var dogNames = []string{"Rex", "Max", "Molly", "Loki", "Jax"} | |
var toyNames = []string{"Tennis Ball", "Rope", "Bear", "Dumbell"} | |
var toyColors = []string{"Red", "Yellow", "Blue", "Green", "Brown"} | |
func main() { | |
r := mux.NewRouter() | |
r.HandleFunc("/dogs/{name}", handleGetDog).Methods("GET") | |
r.HandleFunc("/dogs", handleGetDogs).Methods("GET") | |
server := &http.Server{ | |
Handler: r, | |
Addr: ":8080", | |
ReadTimeout: 5 * time.Second, | |
WriteTimeout: 5 * time.Second, | |
} | |
go func() { | |
log.Println("Starting server") | |
if err := server.ListenAndServe(); err != nil { | |
log.Fatal(err) | |
} | |
}() | |
waitForShutdown(server) | |
} | |
func handleGetDog(w http.ResponseWriter, r *http.Request) { | |
vars := mux.Vars(r) | |
name := vars["name"] | |
dog := Dog { | |
Name: name, | |
Age: rand.Intn(20), | |
Toy: &Toy{ | |
Name: toyNames[rand.Intn(len(toyNames))], | |
Color: toyColors[rand.Intn(len(toyColors))], | |
}, | |
} | |
res, err := json.Marshal(dog) | |
if (err != nil) { | |
panic(err) | |
} | |
w.Header().Set("Content-Type", "application/json") | |
w.Write(res) | |
} | |
func handleGetDogs(w http.ResponseWriter, r *http.Request) { | |
dogs := []Dog{} | |
for _, dogName := range dogNames { | |
dogs = append(dogs, | |
Dog{ | |
Name: dogName, | |
Age: rand.Intn(20), | |
}, | |
) | |
} | |
res, err := json.Marshal(dogs) | |
if (err != nil) { | |
panic(err) | |
} | |
w.Header().Set("Content-Type", "application/json") | |
w.Write(res) | |
} | |
func waitForShutdown(server *http.Server) { | |
interruptChan := make(chan os.Signal, 1) | |
signal.Notify(interruptChan, os.Interrupt, syscall.SIGINT, syscall.SIGTERM) | |
<-interruptChan | |
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5) | |
defer cancel() | |
server.Shutdown(ctx) | |
log.Println("Shutting down") | |
os.Exit(0) | |
} |
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