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haretypes.go
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haretypes.go
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package hare
import (
"bytes"
"fmt"
"hash/fnv"
"math"
"sort"
"sync"
"github.com/spacemeshos/go-spacemesh/common/types"
)
type messageType byte
// declare all known message types.
const (
status messageType = 0
proposal messageType = 1
commit messageType = 2
notify messageType = 3
pre messageType = 10
certify messageType = 11
)
const (
preRound uint32 = math.MaxUint32
certifyRound uint32 = math.MaxUint32 >> 1
)
// declare round identifiers.
const (
statusRound uint32 = iota
proposalRound
commitRound
notifyRound
)
const defaultSetSize = 200
func (mType messageType) String() string {
switch mType {
case status:
return "Status"
case proposal:
return "Proposal"
case commit:
return "Commit"
case notify:
return "Notify"
case pre:
return "PreRound"
case certify:
return "Certification"
default:
return "Unknown message type"
}
}
// Set represents a unique set of values.
type Set struct {
valuesMu sync.RWMutex
values map[types.BlockID]struct{}
id uint32
isIDValid bool
}
// NewDefaultEmptySet creates an empty set with the default size.
func NewDefaultEmptySet() *Set {
return NewEmptySet(defaultSetSize)
}
// NewEmptySet creates an empty set with the provided size.
func NewEmptySet(size int) *Set {
s := &Set{}
s.initWithSize(size)
s.id = 0
s.isIDValid = false
return s
}
// NewSetFromValues creates a set of the provided values.
// Note: duplicated values are ignored.
func NewSetFromValues(values ...types.BlockID) *Set {
s := &Set{}
s.initWithSize(len(values))
for _, v := range values {
s.Add(v)
}
s.id = 0
s.isIDValid = false
return s
}
// NewSet creates a set from the provided array of values.
// Note: duplicated values are ignored.
func NewSet(data []types.BlockID) *Set {
s := &Set{}
s.isIDValid = false
s.initWithSize(len(data))
for _, bid := range data {
s.add(bid)
}
return s
}
// Clone creates a copy of the set.
func (s *Set) Clone() *Set {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
clone := NewEmptySet(len(s.values))
for bid := range s.values {
clone.Add(bid)
}
return clone
}
// Contains returns true if the provided value is contained in the set, false otherwise.
func (s *Set) Contains(id types.BlockID) bool {
return s.contains(id)
}
// Add a value to the set.
// It has no effect if the value already exists in the set.
func (s *Set) Add(id types.BlockID) {
s.valuesMu.Lock()
defer s.valuesMu.Unlock()
if _, exist := s.values[id]; exist {
return
}
s.isIDValid = false
s.values[id] = struct{}{}
}
// Remove a value from the set.
// It has no effect if the value doesn't exist in the set.
func (s *Set) Remove(id types.BlockID) {
s.valuesMu.Lock()
defer s.valuesMu.Unlock()
if _, exist := s.values[id]; !exist {
return
}
s.isIDValid = false
delete(s.values, id)
}
// Equals returns true if the provided set represents this set, false otherwise.
func (s *Set) Equals(g *Set) bool {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
g.valuesMu.RLock()
defer g.valuesMu.RUnlock()
if len(s.values) != len(g.values) {
return false
}
for bid := range s.values {
if _, exist := g.values[bid]; !exist {
return false
}
}
return true
}
// ToSlice returns the array representation of the set.
func (s *Set) ToSlice() []types.BlockID {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
// order keys
keys := make([]types.BlockID, len(s.values))
i := 0
for k := range s.values {
keys[i] = k
i++
}
sort.Slice(keys, func(i, j int) bool { return bytes.Compare(keys[i].Bytes(), keys[j].Bytes()) == -1 })
l := make([]types.BlockID, 0, len(s.values))
for i := range keys {
l = append(l, keys[i])
}
return l
}
func (s *Set) updateID() {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
// order keys
keys := make([]types.BlockID, len(s.values))
i := 0
for k := range s.values {
keys[i] = k
i++
}
sort.Slice(keys, func(i, j int) bool { return bytes.Compare(keys[i].Bytes(), keys[j].Bytes()) == -1 })
// calc
h := fnv.New32()
for i := 0; i < len(keys); i++ {
h.Write(keys[i].Bytes())
}
// update
s.id = h.Sum32()
s.isIDValid = true
}
// ID returns the ObjectID of the set.
func (s *Set) ID() uint32 {
if !s.isIDValid {
s.updateID()
}
return s.id
}
func (s *Set) String() string {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
// TODO: should improve
b := new(bytes.Buffer)
for v := range s.values {
fmt.Fprintf(b, "%v,", v.String())
}
if b.Len() >= 1 {
return b.String()[:b.Len()-1]
}
return b.String()
}
// IsSubSetOf returns true if s is a subset of g, false otherwise.
func (s *Set) IsSubSetOf(g *Set) bool {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
for v := range s.values {
if !g.Contains(v) {
return false
}
}
return true
}
// Intersection returns the intersection a new set which represents the intersection of s and g.
func (s *Set) Intersection(g *Set) *Set {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
both := NewEmptySet(len(s.values))
for v := range s.values {
if g.Contains(v) {
both.Add(v)
}
}
return both
}
// Union returns a new set which represents the union set of s and g.
func (s *Set) Union(g *Set) *Set {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
g.valuesMu.RLock()
defer g.valuesMu.RUnlock()
union := NewEmptySet(len(s.values) + len(g.values))
for v := range s.values {
union.Add(v)
}
for v := range g.values {
union.Add(v)
}
return union
}
// Complement returns a new set that represents the complement of s relatively to the world u.
func (s *Set) Complement(u *Set) *Set {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
comp := NewEmptySet(len(u.values))
for v := range u.values {
if !s.Contains(v) {
comp.Add(v)
}
}
return comp
}
// Subtract g from s.
func (s *Set) Subtract(g *Set) {
g.valuesMu.RLock()
defer g.valuesMu.RUnlock()
for v := range g.values {
s.Remove(v)
}
}
// Size returns the number of elements in the set.
func (s *Set) Size() int {
return s.len()
}
func (s *Set) init() {
s.valuesMu.Lock()
defer s.valuesMu.Unlock()
s.values = make(map[types.BlockID]struct{})
}
func (s *Set) initWithSize(size int) {
s.valuesMu.Lock()
defer s.valuesMu.Unlock()
s.values = make(map[types.BlockID]struct{}, size)
}
func (s *Set) len() int {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
return len(s.values)
}
func (s *Set) contains(id types.BlockID) bool {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
_, ok := s.values[id]
return ok
}
func (s *Set) add(id types.BlockID) {
s.valuesMu.Lock()
defer s.valuesMu.Unlock()
s.values[id] = struct{}{}
}
func (s *Set) remove(id types.BlockID) {
s.valuesMu.Lock()
defer s.valuesMu.Unlock()
delete(s.values, id)
}
func (s *Set) elements() []types.BlockID {
s.valuesMu.RLock()
defer s.valuesMu.RUnlock()
result := make([]types.BlockID, 0, len(s.values))
for id := range s.values {
result = append(result, id)
}
return result
}