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