feat: create polaris config (#2170)

* feat: create polaris config

* feat: improve code

* feat: modify config file path

Co-authored-by: John Guo <john@johng.cn>

example/config/polaris/boot/boot.go

@@ -0,0 +1,32 @@
+package boot
+
+import (
+	"github.com/gogf/gf/contrib/config/polaris/v2"
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/os/gctx"
+)
+
+func init() {
+	var (
+		ctx       = gctx.GetInitCtx()
+		namespace = "default"
+		fileGroup = "goframe"
+		fileName  = "config.yaml"
+		path      = "testdata/polaris.yaml"
+		logDir    = "/tmp/polaris/log"
+	)
+	// Create polaris Client that implements gcfg.Adapter.
+	adapter, err := polaris.New(ctx, polaris.Config{
+		Namespace: namespace,
+		FileGroup: fileGroup,
+		FileName:  fileName,
+		Path:      path,
+		LogDir:    logDir,
+		Watch:     true,
+	})
+	if err != nil {
+		g.Log().Fatalf(ctx, `%+v`, err)
+	}
+	// Change the adapter of default configuration instance.
+	g.Cfg().SetAdapter(adapter)
+}

example/config/polaris/main.go

@@ -0,0 +1,20 @@
+package polaris
+
+import (
+	_ "github.com/gogf/gf/example/config/polaris/boot"
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/os/gctx"
+)
+
+func main() {
+	var ctx = gctx.GetInitCtx()
+
+	// Available checks.
+	g.Dump(g.Cfg().Available(ctx))
+
+	// All key-value configurations.
+	g.Dump(g.Cfg().Data(ctx))
+
+	// Retrieve certain value by key.
+	g.Dump(g.Cfg().MustGet(ctx, "server.address"))
+}

example/config/polaris/testdata/polaris.yaml

@@ -0,0 +1,11 @@
+global:
+  serverConnector:
+    addresses:
+      - 183.47.111.80:8091
+config:
+  configConnector:
+    addresses:
+      - 183.47.111.80:8093
+consumer:
+  localCache:
+    persistDir: "/tmp/polaris/backup"