package subnetevents import ( "errors" "fmt" "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/subnet" subnetid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/subnet/id" "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user" ) // Put represents a notification about FrostFS subnet creation. // Generated by a contract when intending to create a subnet. type Put interface { // Contains the ID of the subnet to be created. eventWithID // ReadCreator reads the user ID of the subnet creator. // Returns an error if the ID is missing. ReadCreator(id *user.ID) error // ReadInfo reads information about a subnet to be created. ReadInfo(info *subnet.Info) error } // PutValidator asserts intent to create a subnet. type PutValidator struct{} // errDiffOwner is returned when the subnet owners differ. var errDiffOwner = errors.New("diff subnet owners") // errDiffID is returned when the subnet IDs differ. var errDiffID = errors.New("diff subnet IDs") // Assert processes the attempt to create a subnet. It approves the creation through nil return. // // All read errors of Put are forwarded. // // It returns an error on: // - zero subnet creation; // - empty ID or different from the one wired into info; // - empty owner ID or different from the one wired into info. func (x PutValidator) Assert(event Put) error { var err error // read ID var id subnetid.ID if err = event.ReadID(&id); err != nil { return fmt.Errorf("read ID: %w", err) } // prevent zero subnet creation if subnetid.IsZero(id) { return zeroSubnetOp{ op: "creation", } } // read creator's user ID in FrostFS system var creator user.ID if err = event.ReadCreator(&creator); err != nil { return fmt.Errorf("read creator: %w", err) } // read information about the subnet var info subnet.Info if err = event.ReadInfo(&info); err != nil { return fmt.Errorf("read info: %w", err) } // check if the explicit ID equals to the one from info if !subnet.AssertReference(info, id) { return errDiffID } // check if the explicit creator equals to the one from info if !subnet.AssertOwnership(info, creator) { return errDiffOwner } return nil }