migrate: add migration script back

migrate/README.md

@@ -0,0 +1,29 @@
+# Migrate from early version of redir
+
+Caution: Because of the limitation of early version of `redir`, i.e.
+it did not record visit pattern per-click. Therefore, after the migration,
+the PV will be losted and will receive the same number of UV.
+
+## Step 1: Dump Data from Redis
+
+```sh
+cd dump && mkdir ips alias # now at redir/migrate/dump
+go run redis-dump.go       # require Go 1.16
+```
+
+Note: change `redis://0.0.0.0:6379/9` to the target address.
+
+## Step 2: Restore Data to MongoDB
+
+Get mongodb instance running, then restore the data via:
+
+```sh
+cd ..                   # now at redir/migrate
+go run mongo-restore.go # require Go 1.16
+```
+
+Note: change `mongodb://0.0.0.0:27017` to the target address.
+
+## License
+
+MIT © 2021 [Changkun Ou](https://changkun.de)

migrate/dump/go.mod

@@ -0,0 +1,5 @@
+module migrate
+
+go 1.16
+
+require github.com/go-redis/redis/v8 v8.7.1

migrate/dump/go.sum

@@ -0,0 +1,97 @@
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migrate/dump/redis-dump.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"github.com/go-redis/redis/v8"
+)
+
+const (
+	prefixalias = "redir:alias:"
+	prefixip    = "redir:ip:"
+)
+
+func main() {
+	opt, err := redis.ParseURL("redis://0.0.0.0:6379/9")
+	if err != nil {
+		log.Fatalf("failed to create opt store: %v", err)
+	}
+	cli := redis.NewClient(opt)
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+
+	fmt.Println("start...")
+
+	// dump aliases
+	aliases, err := cli.Keys(ctx, prefixalias+"*").Result()
+	for _, a := range aliases {
+		data, err := cli.Get(ctx, a).Result()
+		if err != nil {
+			log.Fatalf("failed to read the alias: %v", err)
+		}
+		err = os.WriteFile("alias/"+a+".yml", []byte(data), os.ModePerm)
+		if err != nil {
+			log.Fatalf("failed to write data: %v", err)
+		}
+	}
+	fmt.Println("finish alias: ", len(aliases))
+
+	// dump ips
+	ips, err := cli.Keys(ctx, prefixip+"*").Result()
+	for _, ip := range ips {
+		data, err := cli.Get(ctx, ip).Result()
+		if err != nil {
+			log.Fatalf("failed to read the alias: %v", err)
+		}
+		err = os.WriteFile("ips/"+ip+".yml", []byte(data), os.ModePerm)
+		if err != nil {
+			log.Fatalf("failed to write data: %v", err)
+		}
+	}
+
+	fmt.Println("finish ips: ", len(ips))
+}

migrate/go.mod

@@ -0,0 +1,5 @@
+module migrate
+
+go 1.16
+
+require go.mongodb.org/mongo-driver v1.4.6