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package main | |
import ( | |
"cloud.google.com/go/datastore" | |
"fmt" | |
"golang.org/x/net/context" | |
"log" | |
"net/http" | |
"os" | |
"time" | |
) | |
type Entity struct { | |
Value string | |
} | |
func main() { | |
http.HandleFunc("/", handle) | |
port := os.Getenv("PORT") | |
if port == "" { | |
port = "8080" | |
log.Printf("Defaulting to port %s", port) | |
} | |
log.Printf("Listening on port %s", port) | |
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), nil)) | |
} | |
func timer(start time.Time, name string) { | |
elapsed := time.Since(start) | |
log.Printf("%s took %s", name, elapsed) | |
} | |
var dsClient *datastore.Client | |
func makeClient(ctx context.Context) (*datastore.Client, error) { | |
defer timer(time.Now(), "makeClient") | |
if dsClient == nil { | |
var err error | |
dsClient, err = datastore.NewClient(ctx, "my-project") | |
if err != nil { | |
return nil, err | |
} | |
} | |
return dsClient, nil | |
} | |
func put(ctx context.Context, dsClient *datastore.Client) (*datastore.Key, error) { | |
defer timer(time.Now(), "put") | |
key := datastore.IDKey("RandomEntity", 0, nil) | |
key.Namespace = "test-datatest" | |
entity := &Entity{ | |
Value: "hello world", | |
} | |
return dsClient.Put(ctx, key, entity) | |
} | |
func get(ctx context.Context, dsClient *datastore.Client, key *datastore.Key) (*Entity, error) { | |
defer timer(time.Now(), "get") | |
e := &Entity{} | |
return e, dsClient.Get(ctx, key, e) | |
} | |
func handle(w http.ResponseWriter, r *http.Request) { | |
defer timer(time.Now(), "request") | |
ctx := r.Context() | |
client, err := makeClient(ctx) | |
if err != nil { | |
fmt.Fprintf(w, "client error %v\n", err) | |
return | |
} | |
for i := 0; i < 3; i++ { | |
key, err := put(ctx, client) | |
if err != nil { | |
fmt.Fprintf(w, "put error %v\n", err) | |
return | |
} | |
_, err = get(ctx, client, key) | |
if err != nil { | |
fmt.Fprintf(w, "get error %v\n", err) | |
return | |
} | |
} | |
fmt.Fprintln(w, "Hello, world!") | |
} |
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