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Use a more standardized project layout

Browse Source 
In #2, mrngm made the point that we should move to a more
standardized project structure. This commit does exactly that.
The new project structure is based on the repository listed at
<https://github.com/golang-standards/project-layout>.

Fixes #2.
This commit is contained in:
Daan Sprenkels 2019-09-10 17:52:45 +02:00
parent 471a9c69db
commit 544c093c35
9 changed files with 103 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

0
text/index.txt → assets/text/index.txt
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31
cmd/rushlink/rushlink.go → cmd/rushlink/main.go
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@ -8,7 +8,10 @@ import (
"github.com/gorilla/mux"
"github.com/pkg/errors"
bolt "go.etcd.io/bbolt"
"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
"gitea.hashru.nl/dsprenkels/rushlink/internal/handlers"
"gitea.hashru.nl/dsprenkels/rushlink/internal/metrics"
)
type ParsedArguments struct {
@ -16,7 +19,6 @@ type ParsedArguments struct {
}
var appConfig ParsedArguments
var db *bolt.DB
func main() {
// Parse the arguments and construct the ParsedArguments
@ -26,29 +28,18 @@ func main() {
}
appConfig = *appConfigRef
// Open the bolt database
db, err = bolt.Open(appConfig.databaseName, 0666, &bolt.Options{Timeout: 1 * time.Second})
if err != nil {
decoratedErr := errors.Wrapf(err, "failed to open database at '%v'", appConfig.databaseName)
log.Fatal(decoratedErr)
}
defer db.Close()
err = db.Update(migrateDatabase)
if err != nil {
decoratedErr := errors.Wrapf(err, "failed to migrate database")
log.Fatal(decoratedErr)
}
db.Init(appConfig.databaseName)
// Export prometheus metrics
go startMetricsServer()
go metrics.StartMetricsServer()
// Initialize Gorilla router
router := mux.NewRouter()
router.HandleFunc("/", indexGetHandler).Methods("GET")
router.HandleFunc("/", indexPostHandler).Methods("POST")
router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}", pasteGetHandler).Methods("GET")
router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}/nr", pasteGetHandlerNoRedirect).Methods("GET")
router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}/meta", pasteGetHandlerMeta).Methods("GET")
router.HandleFunc("/", handlers.IndexGetHandler).Methods("GET")
router.HandleFunc("/", handlers.IndexPostHandler).Methods("POST")
router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}", handlers.PasteGetHandler).Methods("GET")
router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}/nr", handlers.PasteGetHandlerNoRedirect).Methods("GET")
router.HandleFunc("/{key:[A-Za-z0-9-_]{4,}}/meta", handlers.PasteGetHandlerMeta).Methods("GET")
// Start the server
srv := &http.Server{

54
cmd/rushlink/metrics.go
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@ -1,54 +0,0 @@
package main
import (
"log"
"net/http"
"time"
bolt "go.etcd.io/bbolt"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const (
METRICS_ADDR = "127.0.0.1:58614"
)
var (
shortenUrlsTotal = promauto.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "rushlink",
Subsystem: "shorten",
Name: "urls_total",
Help: "The current amount of shortened urls in the database.",
}, func() float64 {
var metric float64
if err := db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte("shorten"))
if bucket == nil {
return errors.New("bucket 'shorten' could not be found")
}
metric = float64(bucket.Stats().KeyN)
return nil
}); err != nil {
log.Printf("error: %v", errors.Wrap(err, "fetching shorten_urls_total metric"))
return 0
}
return metric
})
)
func startMetricsServer() {
router := mux.NewRouter()
router.Handle("/metrics", promhttp.Handler()).Methods("GET")
srv := &http.Server{
Handler: router,
Addr: METRICS_ADDR,
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
log.Fatal(srv.ListenAndServe())
}

1
go.mod
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@ -3,6 +3,7 @@ module gitea.hashru.nl/dsprenkels/rushlink
go 1.12
require (
github.com/go-bindata/go-bindata v3.1.2+incompatible // indirect
github.com/gorilla/mux v1.7.3
github.com/pkg/errors v0.8.1
github.com/prometheus/client_golang v1.1.0

1
go.sum
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@ -6,6 +6,7 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-bindata/go-bindata v3.1.2+incompatible/go.mod h1:xK8Dsgwmeed+BBsSy2XTopBn/8uK2HWuGSnA11C3Joo=
github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=

19
cmd/rushlink/db.go → internal/db/db.go
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@ -1,13 +1,18 @@
package main
package db
import (
"fmt"
"log"
"time"
"gitea.hashru.nl/dsprenkels/rushlink/gobmarsh"
"github.com/pkg/errors"
bolt "go.etcd.io/bbolt"
"gitea.hashru.nl/dsprenkels/rushlink/pkg/gobmarsh"
)
var DB *bolt.DB
// The current database version
//
// If we alter the database format, we bump this number and write a new
@ -25,6 +30,16 @@ const BUCKET_PASTES = "pastes"
// CURRENT_MIGRATE_VERSION, the database has to be migrated.
const KEY_MIGRATE_VERSION = "migrate_version"
// Open the bolt database
func Init(name string) error {
var err error
DB, err = bolt.Open(name, 0666, &bolt.Options{Timeout: 1 * time.Second})
if err != nil {
return errors.Wrapf(err, "failed to open database at '%v'", name)
}
return DB.Update(migrateDatabase)
}
// Initialize and migrate the database to the current version
func migrateDatabase(tx *bolt.Tx) error {
dbVersion, err := dbVersion(tx)

34
cmd/rushlink/handlers.go → internal/handlers/handlers.go
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@ -1,8 +1,8 @@
package main
package handlers
//go:generate go get github.com/go-bindata/go-bindata
//go:generate go get -u github.com/go-bindata/go-bindata/...
//go:generate go-bindata -pkg $GOPACKAGE text/
//go:generate go-bindata -pkg $GOPACKAGE -prefix ../../assets ../../assets/...
import (
"bytes"
@ -19,10 +19,12 @@ import (
"time"
"unicode"
"gitea.hashru.nl/dsprenkels/rushlink/gobmarsh"
"github.com/gorilla/mux"
"github.com/pkg/errors"
bolt "go.etcd.io/bbolt"
"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
"gitea.hashru.nl/dsprenkels/rushlink/pkg/gobmarsh"
)
type PasteType int
@ -82,13 +84,13 @@ func (t PasteState) String() (string, error) {
}
}
func indexGetHandler(w http.ResponseWriter, r *http.Request) {
func IndexGetHandler(w http.ResponseWriter, r *http.Request) {
if err := indexTemplate.Execute(w, nil); err != nil {
panic(err)
}
}
func indexPostHandler(w http.ResponseWriter, r *http.Request) {
func IndexPostHandler(w http.ResponseWriter, r *http.Request) {
if err := r.ParseMultipartForm(50 * 1000 * 1000); err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Internal server error: %v\n", err)
@ -115,18 +117,18 @@ func indexPostHandler(w http.ResponseWriter, r *http.Request) {
return
}
shortenPostHandler(w, r)
ShortenPostHandler(w, r)
}
func pasteGetHandler(w http.ResponseWriter, r *http.Request) {
func PasteGetHandler(w http.ResponseWriter, r *http.Request) {
pasteGetHandlerInner(w, r, false, false)
}
func pasteGetHandlerNoRedirect(w http.ResponseWriter, r *http.Request) {
func PasteGetHandlerNoRedirect(w http.ResponseWriter, r *http.Request) {
pasteGetHandlerInner(w, r, true, false)
}
func pasteGetHandlerMeta(w http.ResponseWriter, r *http.Request) {
func PasteGetHandlerMeta(w http.ResponseWriter, r *http.Request) {
pasteGetHandlerInner(w, r, false, true)
}
@ -134,7 +136,7 @@ func pasteGetHandlerInner(w http.ResponseWriter, r *http.Request, noRedirect, sh
vars := mux.Vars(r)
key := vars["key"]
var storedPaste *StoredPaste
if err := db.View(func(tx *bolt.Tx) error {
if err := db.DB.View(func(tx *bolt.Tx) error {
var err error
storedPaste, err = getURL(tx, []byte(key))
return err
@ -204,7 +206,7 @@ func pasteGetHandlerInner(w http.ResponseWriter, r *http.Request, noRedirect, sh
}
}
func shortenPostHandler(w http.ResponseWriter, r *http.Request) {
func ShortenPostHandler(w http.ResponseWriter, r *http.Request) {
rawurl := r.PostForm.Get("shorten")
userURL, err := url.ParseRequestURI(rawurl)
if err != nil {
@ -224,7 +226,7 @@ func shortenPostHandler(w http.ResponseWriter, r *http.Request) {
}
var storedPaste *StoredPaste
if err := db.Update(func(tx *bolt.Tx) error {
if err := db.DB.Update(func(tx *bolt.Tx) error {
ownerKey, ok := getOwnerTokenFromRequest(r)
if ok == false {
// Owner key not supplied or invalid, generate a new one
@ -262,9 +264,9 @@ func shortenPostHandler(w http.ResponseWriter, r *http.Request) {
// Retrieve a URL from the database
func getURL(tx *bolt.Tx, key []byte) (*StoredPaste, error) {
shortenBucket := tx.Bucket([]byte(BUCKET_PASTES))
shortenBucket := tx.Bucket([]byte(db.BUCKET_PASTES))
if shortenBucket == nil {
return nil, fmt.Errorf("bucket %v does not exist", BUCKET_PASTES)
return nil, fmt.Errorf("bucket %v does not exist", db.BUCKET_PASTES)
}
storedBytes := shortenBucket.Get(key)
if storedBytes == nil {
@ -279,9 +281,9 @@ func getURL(tx *bolt.Tx, key []byte) (*StoredPaste, error) {
//
// Returns the new ID if the url was successfully shortened
func shortenURL(tx *bolt.Tx, userURL *url.URL, ownerKey [16]byte) (*StoredPaste, error) {
shortenBucket := tx.Bucket([]byte(BUCKET_PASTES))
shortenBucket := tx.Bucket([]byte(db.BUCKET_PASTES))
if shortenBucket == nil {
return nil, fmt.Errorf("bucket %v does not exist", BUCKET_PASTES)
return nil, fmt.Errorf("bucket %v does not exist", db.BUCKET_PASTES)
}
// Generate a key until it is not in the database, this occurs in O(log N),

55
internal/metrics/metrics.go Normal file
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@ -0,0 +1,55 @@
package metrics
import (
"log"
"net/http"
"time"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
bolt "go.etcd.io/bbolt"
"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
)
const (
METRICS_ADDR = "127.0.0.1:58614"
)
func StartMetricsServer() {
var (
_ = promauto.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "rushlink",
Subsystem: "shorten",
Name: "urls_total",
Help: "The current amount of shortened urls in the database.",
}, func() float64 {
var metric float64
if err := db.DB.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte("shorten"))
if bucket == nil {
return errors.New("bucket 'shorten' could not be found")
}
metric = float64(bucket.Stats().KeyN)
return nil
}); err != nil {
log.Printf("error: %v", errors.Wrap(err, "fetching shorten_urls_total metric"))
return 0
}
return metric
})
)
router := mux.NewRouter()
router.Handle("/metrics", promhttp.Handler()).Methods("GET")
srv := &http.Server{
Handler: router,
Addr: METRICS_ADDR,
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
log.Fatal(srv.ListenAndServe())
}

0
gobmarsh/marshal.go → pkg/gobmarsh/marshal.go
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