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prefixed_state.go
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/
prefixed_state.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package queue
import (
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/utils/hashing"
"github.com/ava-labs/avalanchego/utils/wrappers"
)
// Constants
const (
stackSizeID byte = iota
stackID
jobID
blockingID
)
var (
stackSize = []byte{stackSizeID}
)
type prefixedState struct{ state }
func (ps *prefixedState) SetStackSize(db database.Database, size uint32) error {
return ps.state.SetInt(db, stackSize, size)
}
func (ps *prefixedState) StackSize(db database.Database) (uint32, error) {
return ps.state.Int(db, stackSize)
}
func (ps *prefixedState) SetStackIndex(db database.Database, index uint32, job Job) error {
p := wrappers.Packer{Bytes: make([]byte, 1+wrappers.IntLen)}
p.PackByte(stackID)
p.PackInt(index)
return ps.state.SetJob(db, p.Bytes, job)
}
func (ps *prefixedState) DeleteStackIndex(db database.Database, index uint32) error {
p := wrappers.Packer{Bytes: make([]byte, 1+wrappers.IntLen)}
p.PackByte(stackID)
p.PackInt(index)
return db.Delete(p.Bytes)
}
func (ps *prefixedState) StackIndex(db database.Database, index uint32) (Job, error) {
p := wrappers.Packer{Bytes: make([]byte, 1+wrappers.IntLen)}
p.PackByte(stackID)
p.PackInt(index)
return ps.state.Job(db, p.Bytes)
}
func (ps *prefixedState) SetJob(db database.Database, job Job) error {
p := wrappers.Packer{Bytes: make([]byte, 1+hashing.HashLen)}
p.PackByte(jobID)
id := job.ID()
p.PackFixedBytes(id[:])
return ps.state.SetJob(db, p.Bytes, job)
}
func (ps *prefixedState) HasJob(db database.Database, id ids.ID) (bool, error) {
p := wrappers.Packer{Bytes: make([]byte, 1+hashing.HashLen)}
p.PackByte(jobID)
p.PackFixedBytes(id[:])
return db.Has(p.Bytes)
}
func (ps *prefixedState) DeleteJob(db database.Database, id ids.ID) error {
p := wrappers.Packer{Bytes: make([]byte, 1+hashing.HashLen)}
p.PackByte(jobID)
p.PackFixedBytes(id[:])
return db.Delete(p.Bytes)
}
func (ps *prefixedState) Job(db database.Database, id ids.ID) (Job, error) {
p := wrappers.Packer{Bytes: make([]byte, 1+hashing.HashLen)}
p.PackByte(jobID)
p.PackFixedBytes(id[:])
return ps.state.Job(db, p.Bytes)
}
func (ps *prefixedState) AddBlocking(db database.Database, id ids.ID, blocking ids.ID) error {
p := wrappers.Packer{Bytes: make([]byte, 1+hashing.HashLen)}
p.PackByte(blockingID)
p.PackFixedBytes(id[:])
return ps.state.AddID(db, p.Bytes, blocking)
}
func (ps *prefixedState) DeleteBlocking(db database.Database, id ids.ID, blocking []ids.ID) error {
p := wrappers.Packer{Bytes: make([]byte, 1+hashing.HashLen)}
p.PackByte(blockingID)
p.PackFixedBytes(id[:])
for _, blocked := range blocking {
if err := ps.state.RemoveID(db, p.Bytes, blocked); err != nil {
return err
}
}
return nil
}
func (ps *prefixedState) Blocking(db database.Database, id ids.ID) ([]ids.ID, error) {
p := wrappers.Packer{Bytes: make([]byte, 1+hashing.HashLen)}
p.PackByte(blockingID)
p.PackFixedBytes(id[:])
return ps.state.IDs(db, p.Bytes)
}