func testIncremental(t *testing.T, h hash.Hash32, result uint32, which string) {
h.Reset()
var parts = []string{
"h",
"ell",
"o",
"he",
"llo",
"hellohello",
}
for _, p := range parts {
l, _ := h.Write([]byte(p))
if l != len(p) {
t.Errorf("Write(%d bytes) = %d, want %d\n", len(p), l, len(p))
}
}
h32 := h.Sum32()
if h32 != result {
t.Errorf("%s: incremental failed: got %08x", which, h32)
}
h.Reset()
h.Write([]byte("hellohellohellohello"))
h32 = h.Sum32()
if h32 != result {
t.Errorf("%s: failed: got %08x", which, h32)
}
}
func testIncremental(t *testing.T, h hash.Hash32, result uint32, which string) {
h.Reset()
h.Write([]byte("hello"))
h.Write([]byte("h"))
h.Write([]byte("e"))
h.Write([]byte("l"))
h.Write([]byte("l"))
h.Write([]byte("o"))
h.Write([]byte("hellohello"))
h32 := h.Sum32()
if h32 != result {
t.Errorf("%s: incremental failed: got %08x", which, h32)
}
h.Reset()
h.Write([]byte("hellohellohellohello"))
h32 = h.Sum32()
if h32 != result {
t.Errorf("%s: failed: got %08x", which, h32)
}
}
func TestRef(t *testing.T) {
for _, elem := range data {
var h32 hash.Hash32 = New32()
h32.Write([]byte(elem.s))
if v := h32.Sum32(); v != elem.h32 {
t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
}
if v := Sum32([]byte(elem.s)); v != elem.h32 {
t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
}
var h64 hash.Hash64 = New64()
h64.Write([]byte(elem.s))
if v := h64.Sum64(); v != elem.h64_1 {
t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h64_1)
}
var h128 Hash128 = New128()
h128.Write([]byte(elem.s))
if v1, v2 := h128.Sum128(); v1 != elem.h64_1 || v2 != elem.h64_2 {
t.Errorf("'%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
}
if v1, v2 := Sum128([]byte(elem.s)); v1 != elem.h64_1 || v2 != elem.h64_2 {
t.Errorf("'%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
}
}
}
func commonBench(b *testing.B, h hash.Hash32, golden []_Golden) {
for i := 0; i < b.N; i++ {
for _, g := range golden {
h.Reset()
h.Write([]byte(g.in))
h.Sum32()
}
}
}
func imageHash(h hash.Hash32, dir *Directory, img *Image) int {
h.Reset()
h.Write([]byte(dir.RelPat()))
h.Write([]byte(img.Name()))
bytes, err := img.FileTime().MarshalBinary()
if err == nil {
h.Write(bytes)
}
return int(h.Sum32())
}
func TestRef(t *testing.T) {
for _, elem := range data {
var h32 hash.Hash32 = New32()
h32.Write([]byte(elem.s))
if v := h32.Sum32(); v != elem.h32 {
t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
}
var h32_byte hash.Hash32 = New32()
h32_byte.Write([]byte(elem.s))
target := fmt.Sprintf("%08x", elem.h32)
if p := fmt.Sprintf("%x", h32_byte.Sum(nil)); p != target {
t.Errorf("'%s': %s (want %s)", elem.s, p, target)
}
if v := Sum32([]byte(elem.s)); v != elem.h32 {
t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
}
var h64 hash.Hash64 = New64()
h64.Write([]byte(elem.s))
if v := h64.Sum64(); v != elem.h64_1 {
t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h64_1)
}
var h64_byte hash.Hash64 = New64()
h64_byte.Write([]byte(elem.s))
target = fmt.Sprintf("%016x", elem.h64_1)
if p := fmt.Sprintf("%x", h64_byte.Sum(nil)); p != target {
t.Errorf("Sum64: '%s': %s (want %s)", elem.s, p, target)
}
if v := Sum64([]byte(elem.s)); v != elem.h64_1 {
t.Errorf("Sum64: '%s': 0x%x (want 0x%x)", elem.s, v, elem.h64_1)
}
var h128 Hash128 = New128()
h128.Write([]byte(elem.s))
if v1, v2 := h128.Sum128(); v1 != elem.h64_1 || v2 != elem.h64_2 {
t.Errorf("New128: '%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
}
var h128_byte Hash128 = New128()
h128_byte.Write([]byte(elem.s))
target = fmt.Sprintf("%016x%016x", elem.h64_1, elem.h64_2)
if p := fmt.Sprintf("%x", h128_byte.Sum(nil)); p != target {
t.Errorf("New128: '%s': %s (want %s)", elem.s, p, target)
}
if v1, v2 := Sum128([]byte(elem.s)); v1 != elem.h64_1 || v2 != elem.h64_2 {
t.Errorf("Sum128: '%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
}
}
}
// FilesPathToPartition hashes a file path to a partition.
func FilesPathToPartition(h hash.Hash32,
partitions []string, path string) string {
if len(partitions) <= 0 {
return ""
}
h.Reset()
io.WriteString(h, path)
i := h.Sum32() % uint32(len(partitions))
return partitions[i]
}
// Returns shard under given key
func (m ConcurrentMap) GetShard(key string) *ConcurrentMapShared {
hasherAsInterface := hashPool.Get()
var hasher hash.Hash32
if hasherAsInterface == nil {
hasher = fnv.New32()
} else {
hasher = hasherAsInterface.(hash.Hash32)
hasher.Reset()
}
hasher.Write([]byte(key))
sum := hasher.Sum32()
hashPool.Put(hasher)
return m[uint(sum)%uint(SHARD_COUNT)]
}
func testGolden(t *testing.T, h hash.Hash32, golden []_Golden, which string) {
for _, g := range golden {
h.Reset()
h.Write([]byte(g.in))
sum := h.Sum32()
if sum != g.out {
t.Errorf("%s(%s) = 0x%x want 0x%x", which, g.in, sum, g.out)
}
bsum := h.Sum(nil)
if len(bsum) != 4 {
t.Errorf("%s Sum(nil) returned %d bytes, wanted 4: %s\n", which, len(bsum), bsum)
}
s := binary.BigEndian.Uint32(bsum)
if s != sum {
t.Errorf("%s(%s).Sum(nil) = 0x%x want 0x%x", which, g.in, sum, g.out)
}
bsum = h.Sum([]byte{0x01, 0x02, 0x03, 0x04})
if len(bsum) != 8 {
t.Errorf("%s Sum(bsum) returned %d bytes, wanted 8: %x\n", which, len(bsum), bsum)
}
s = binary.BigEndian.Uint32(bsum[0:])
s2 := binary.BigEndian.Uint32(bsum[4:])
if s != 0x01020304 || s2 != sum {
t.Errorf("%s(%s).Sum(bsum) = %x (expected 0x01020304 %x )", which, g.in, bsum, sum)
}
}
}
// SeriesHash returns a hash of the metric, tags pair. The hash falls in uint16
// range.
func (c cmd) SeriesHash(hash hash.Hash32) int {
hash.Reset()
buf := c.Point()
// include Metric
i := bytes.IndexByte(buf, ' ')
hash.Write(buf[:i])
buf = buf[i+1:]
// exclude Time
i = bytes.IndexByte(buf, ' ')
buf = buf[i+1:]
// exclude Value
i = bytes.IndexByte(buf, ' ')
// include Tags
hash.Write(buf[i:])
// Sum
sum := hash.Sum32()
return int(uint16(sum))
}
// Hash32 is a convenience method for hashing a string against a hash.Hash32
func Hash32(s string, h hash.Hash32) uint32 {
h.Reset()
h.Write([]byte(s))
return h.Sum32()
}
var key []byte
BeforeEach(func() {
jhash = New()
key = []byte("Apple")
})
Describe("New", func() {
It("returns jenkhash", func() {
var h *jenkhash
Expect(jhash).To(BeAssignableToTypeOf(h))
})
It("initializes offset to 0", func() {
Expect(jhash.Sum32()).To(Equal(uint32(0)))
})
})
Describe("Write", func() {
It("returns key length", func() {
length, _ := jhash.Write(key)
Expect(length).To(Equal(5))
})
It("has no error", func() {
_, err := jhash.Write(key)
Expect(err).To(BeNil())
})
