[#482] reputation/router: Move router to ./common

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/services/reputation/common/router/router.go

@@ -0,0 +1,80 @@
+package router
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-node/pkg/util/logger"
+)
+
+// Prm groups the required parameters of the Router's constructor.
+//
+// All values must comply with the requirements imposed on them.
+// Passing incorrect parameter values will result in constructor
+// failure (error or panic depending on the implementation).
+type Prm struct {
+	// Characteristics of the local node's server.
+	//
+	// Must not be nil.
+	LocalServerInfo ServerInfo
+
+	// Component for sending values to a fixed route point.
+	//
+	// Must not be nil.
+	RemoteWriterProvider RemoteWriterProvider
+
+	// Route planner.
+	//
+	// Must not be nil.
+	Builder Builder
+}
+
+// Router represents component responsible for routing
+// local trust values over the network.
+//
+// For each fixed pair (node peer, epoch) there is a
+// single value route on the network. Router provides the
+// interface for writing values to the next point of the route.
+//
+// For correct operation, Router must be created using
+// the constructor (New) based on the required parameters
+// and optional components. After successful creation,
+// the Router is immediately ready to work through API.
+type Router struct {
+	log *logger.Logger
+
+	remoteProvider RemoteWriterProvider
+
+	routeBuilder Builder
+
+	localSrvInfo ServerInfo
+}
+
+const invalidPrmValFmt = "invalid parameter %s (%T):%v"
+
+func panicOnPrmValue(n string, v interface{}) {
+	panic(fmt.Sprintf(invalidPrmValFmt, n, v, v))
+}
+
+func New(prm Prm, opts ...Option) *Router {
+	switch {
+	case prm.RemoteWriterProvider == nil:
+		panicOnPrmValue("RemoteWriterProvider", prm.RemoteWriterProvider)
+	case prm.Builder == nil:
+		panicOnPrmValue("Builder", prm.Builder)
+	case prm.LocalServerInfo == nil:
+		panicOnPrmValue("LocalServerInfo", prm.LocalServerInfo)
+	}
+
+	o := defaultOpts()
+
+	for i := range opts {
+		opts[i](o)
+	}
+
+	return &Router{
+		log:            o.log,
+		remoteProvider: prm.RemoteWriterProvider,
+		routeBuilder:   prm.Builder,
+		localSrvInfo:   prm.LocalServerInfo,
+	}
+}