[#1129] policer: Pull required EC chunks

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/replicator/pull.go

@@ -0,0 +1,72 @@
+package replicator
+
+import (
+	"context"
+	"errors"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/engine"
+	getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
+	tracingPkg "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/tracing"
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+	"go.uber.org/zap"
+)
+
+var errFailedToGetObjectFromAnyNode = errors.New("failed to get object from any node")
+
+func (p *Replicator) HandlePullTask(ctx context.Context, task Task) {
+	p.metrics.IncInFlightRequest()
+	defer p.metrics.DecInFlightRequest()
+	defer func() {
+		p.log.Debug(logs.ReplicatorFinishWork, zap.String("type", "pull"))
+	}()
+
+	ctx, span := tracing.StartSpanFromContext(ctx, "Replicator.HandlePullTask",
+		trace.WithAttributes(
+			attribute.Stringer("address", task.Addr),
+			attribute.Int("nodes_count", len(task.Nodes)),
+		))
+	defer span.End()
+
+	var obj *objectSDK.Object
+
+	for _, node := range task.Nodes {
+		var err error
+		obj, err = p.remoteGetter.Get(ctx, getsvc.RemoteGetPrm{
+			Address: task.Addr,
+			Node:    node,
+		})
+		if err == nil {
+			break
+		}
+		var endpoints []string
+		node.IterateNetworkEndpoints(func(s string) bool {
+			endpoints = append(endpoints, s)
+			return false
+		})
+		p.log.Error(logs.ReplicatorCouldNotGetObjectFromRemoteStorage,
+			zap.Stringer("object", task.Addr),
+			zap.Error(err),
+			zap.Strings("endpoints", endpoints),
+			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
+	}
+
+	if obj == nil {
+		p.log.Error(logs.ReplicatorCouldNotGetObjectFromRemoteStorage,
+			zap.Stringer("object", task.Addr),
+			zap.Error(errFailedToGetObjectFromAnyNode),
+			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
+		return
+	}
+
+	err := engine.Put(ctx, p.localStorage, obj)
+	if err != nil {
+		p.log.Error(logs.ReplicatorCouldNotPutObjectToLocalStorage,
+			zap.Stringer("object", task.Addr),
+			zap.Error(err),
+			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
+	}
+}