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Security News
Deno 2.2 Improves Dependency Management and Expands Node.js Compatibility
Deno 2.2 enhances Node.js compatibility, improves dependency management, adds OpenTelemetry support, and expands linting and task automation for developers.
github.com/mailgun/scroll
Scroll is a lightweight library for building Go HTTP services at Mailgun. It is built on top of mux and adds:
Scroll is a work in progress. Use at your own risk.
go get github.com/mailgun/scroll
Building an application with Scroll is simple. Here's a server that listens for GET or POST requests to http://0.0.0.0:8080/resources/{resourceID}
and echoes back the resource ID provided in the URL.
package main
import (
"fmt"
"io/ioutil"
"net/http"
"os"
"strings"
"time"
"github.com/mailgun/holster/etcdutil"
"github.com/mailgun/metrics"
"github.com/mailgun/scroll"
"github.com/mailgun/scroll/vulcand"
)
const (
APPNAME = "example"
)
func Example() {
// These environment variables provided by the environment,
// we set them here to only to illustrate how `NewEtcdConfig()`
// uses the environment to create a new etcd config
os.Setenv("ETCD3_USER", "root")
os.Setenv("ETCD3_PASSWORD", "rootpw")
os.Setenv("ETCD3_ENDPOINT", "localhost:2379")
os.Setenv("ETCD3_SKIP_VERIFY", "true")
// If this is set to anything but empty string "", scroll will attempt
// to retrieve the applications config from '/mailgun/configs/{env}/APPNAME'
// and fill in the PublicAPI, ProtectedAPI, etc.. fields from that config
os.Setenv("MG_ENV", "")
// Create a new etc config from available environment variables
cfg, err := etcdutil.NewEtcdConfig(nil)
if err != nil {
fmt.Fprintf(os.Stderr, "while creating etcd config: %s\n", err)
return
}
hostname, err := os.Hostname()
if err != nil {
fmt.Fprintf(os.Stderr, "while obtaining hostname: %s\n", err)
return
}
// Send metrics to statsd @ localhost
mc, err := metrics.NewWithOptions("localhost:8125",
fmt.Sprintf("%s.%v", APPNAME, strings.Replace(hostname, ".", "_", -1)),
metrics.Options{UseBuffering: true, FlushPeriod: time.Second})
if err != nil {
fmt.Fprintf(os.Stderr, "while initializing metrics: %s\n", err)
return
}
app, err := scroll.NewAppWithConfig(scroll.AppConfig{
Vulcand: &vulcand.Config{Etcd: cfg},
PublicAPIURL: "http://api.mailgun.net:1212",
ProtectedAPIURL: "http://localhost:1212",
PublicAPIHost: "api.mailgun.net",
ProtectedAPIHost: "localhost",
Name: APPNAME,
ListenPort: 1212,
Client: mc,
})
if err != nil {
fmt.Fprintf(os.Stderr, "while initializing scroll: %s\n", err)
return
}
app.AddHandler(
scroll.Spec{
Methods: []string{"GET"},
Paths: []string{"/hello"},
Handler: func(w http.ResponseWriter, r *http.Request, params map[string]string) (interface{}, error) {
return scroll.Response{"message": "Hello World"}, nil
},
},
)
// Start serving requests
app.Run()
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