Battlesnake/Byte-snake-engine
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Add static seed to royale rulset.

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This commit is contained in:
Brad Van Vugt 2020-07-29 13:14:42 -07:00
parent 64dfc6dd55
commit dcbc3aac5a
2 changed files with 19 additions and 76 deletions
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26
royale.go
View file

@ -2,13 +2,14 @@ package rules
import (
"errors"
"hash/crc32"
"math/rand"
)
type RoyaleRuleset struct {
StandardRuleset
Seed int64
Turn int32
ShrinkEveryNTurns int32
DamagePerTurn int32
@ -65,10 +66,7 @@ func (r *RoyaleRuleset) populateOutOfBounds(b *BoardState, turn int32) error {
return nil
}
randGenerator, err := r.getRandGenerator(b)
if err != nil {
return err
}
randGenerator := rand.New(rand.NewSource(r.Seed))
numShrinks := turn / r.ShrinkEveryNTurns
minX, maxX := int32(0), b.Width-1
@ -121,21 +119,3 @@ func (r *RoyaleRuleset) damageOutOfBounds(b *BoardState) error {
return nil
}
func (r *RoyaleRuleset) getRandGenerator(b *BoardState) (*rand.Rand, error) {
if len(b.Snakes) < 1 {
return nil, errors.New("royale mode requires at least one snake id")
}
// Use the "lowest" Snake ID as a random seed
seedStr := b.Snakes[0].ID
for i := 1; i < len(b.Snakes); i++ {
if b.Snakes[i].ID < seedStr {
seedStr = b.Snakes[i].ID
}
}
seed := int64(crc32.ChecksumIEEE([]byte(seedStr)))
return rand.New(rand.NewSource(seed)), nil
}

69
royale_test.go
View file

@ -23,18 +23,8 @@ func TestRoyaleDefaultSanity(t *testing.T) {
require.NoError(t, err)
}
func TestRoyaleOutOfBoundsNoSnakes(t *testing.T) {
b := &BoardState{}
r := RoyaleRuleset{
ShrinkEveryNTurns: 10,
DamagePerTurn: 10,
}
err := r.populateOutOfBounds(b, 100)
require.Equal(t, errors.New("royale mode requires at least one snake id"), err)
}
func TestRoyaleOutOfBounds(t *testing.T) {
seed := int64(25543234525)
tests := []struct {
Width int32
Height int32
@ -66,11 +56,11 @@ func TestRoyaleOutOfBounds(t *testing.T) {
},
{
Width: 3, Height: 3, Turn: 31, ShrinkEveryNTurns: 10,
ExpectedOutOfBounds: []Point{{0, 0}, {0, 1}, {0, 2}, {1, 0}, {1, 1}, {1, 2}, {2, 2}},
ExpectedOutOfBounds: []Point{{0, 0}, {0, 1}, {0, 2}, {1, 1}, {1, 2}, {2, 1}, {2, 2}},
},
{
Width: 3, Height: 3, Turn: 42, ShrinkEveryNTurns: 10,
ExpectedOutOfBounds: []Point{{0, 0}, {0, 1}, {0, 2}, {1, 0}, {1, 1}, {1, 2}, {2, 0}, {2, 2}},
ExpectedOutOfBounds: []Point{{0, 0}, {0, 1}, {0, 2}, {1, 0}, {1, 1}, {1, 2}, {2, 0}, {2, 1}, {2, 2}},
},
{
Width: 3, Height: 3, Turn: 53, ShrinkEveryNTurns: 10,
@ -90,9 +80,9 @@ func TestRoyaleOutOfBounds(t *testing.T) {
b := &BoardState{
Width: test.Width,
Height: test.Height,
Snakes: []Snake{{ID: "test-snake"}},
}
r := RoyaleRuleset{
Seed: seed,
Turn: test.Turn,
ShrinkEveryNTurns: test.ShrinkEveryNTurns,
}
@ -209,16 +199,18 @@ func TestRoyaleDamagePerTurn(t *testing.T) {
}
func TestRoyalDamageNextTurn(t *testing.T) {
b := &BoardState{Width: 10, Height: 10, Snakes: []Snake{{ID: "one", Health: 100, Body: []Point{{1, 0}}}}}
r := RoyaleRuleset{ShrinkEveryNTurns: 10, DamagePerTurn: 30}
m := []SnakeMove{{ID: "one", Move: "right"}}
seed := int64(45897034512311)
b := &BoardState{Width: 10, Height: 10, Snakes: []Snake{{ID: "one", Health: 100, Body: []Point{{9, 1}}}}}
r := RoyaleRuleset{Seed: seed, ShrinkEveryNTurns: 10, DamagePerTurn: 30}
m := []SnakeMove{{ID: "one", Move: "up"}}
r.Turn = 10
n, err := r.CreateNextBoardState(b, m)
require.NoError(t, err)
require.Equal(t, NotEliminated, n.Snakes[0].EliminatedCause)
require.Equal(t, int32(99), n.Snakes[0].Health)
require.Equal(t, Point{2, 0}, n.Snakes[0].Body[0])
require.Equal(t, Point{9, 0}, n.Snakes[0].Body[0])
require.Equal(t, 10, len(r.OutOfBounds)) // X = 0
r.Turn = 20
@ -226,51 +218,22 @@ func TestRoyalDamageNextTurn(t *testing.T) {
require.NoError(t, err)
require.Equal(t, NotEliminated, n.Snakes[0].EliminatedCause)
require.Equal(t, int32(99), n.Snakes[0].Health)
require.Equal(t, Point{2, 0}, n.Snakes[0].Body[0])
require.Equal(t, 19, len(r.OutOfBounds)) // Y = 0
require.Equal(t, Point{9, 0}, n.Snakes[0].Body[0])
require.Equal(t, 20, len(r.OutOfBounds)) // X = 9
r.Turn = 21
n, err = r.CreateNextBoardState(b, m)
require.NoError(t, err)
require.Equal(t, NotEliminated, n.Snakes[0].EliminatedCause)
require.Equal(t, int32(69), n.Snakes[0].Health)
require.Equal(t, Point{2, 0}, n.Snakes[0].Body[0])
require.Equal(t, 19, len(r.OutOfBounds))
require.Equal(t, Point{9, 0}, n.Snakes[0].Body[0])
require.Equal(t, 20, len(r.OutOfBounds))
b.Snakes[0].Health = 15
n, err = r.CreateNextBoardState(b, m)
require.NoError(t, err)
require.Equal(t, EliminatedByStarvation, n.Snakes[0].EliminatedCause)
require.Equal(t, int32(0), n.Snakes[0].Health)
require.Equal(t, Point{2, 0}, n.Snakes[0].Body[0])
require.Equal(t, 19, len(r.OutOfBounds))
}
func TestRoyalGetRandGenerator(t *testing.T) {
tests := []struct {
SnakeIDs []string
Error error
firstInt int
}{
{[]string{}, errors.New("royale mode requires at least one snake id"), 0},
{[]string{"1"}, nil, 1400170195406563237},
{[]string{"1", "2", "3", "4", "5"}, nil, 1400170195406563237},
{[]string{"5", "4", "3", "2", "1"}, nil, 1400170195406563237},
{[]string{"3", "4", "1", "5", "2"}, nil, 1400170195406563237},
{[]string{"3", "4", "5", "2"}, nil, 5139088052943840554},
}
for _, test := range tests {
b := &BoardState{}
for _, id := range test.SnakeIDs {
b.Snakes = append(b.Snakes, Snake{ID: id})
}
r := RoyaleRuleset{}
generator, err := r.getRandGenerator(b)
require.Equal(t, test.Error, err)
if err == nil {
require.Equal(t, test.firstInt, generator.Int())
}
}
require.Equal(t, Point{9, 0}, n.Snakes[0].Body[0])
require.Equal(t, 20, len(r.OutOfBounds))
}