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JSON: Fix complex64 encoding precision #1011

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merged 4 commits into from Sep 10, 2021
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Merged

JSON: Fix complex64 encoding precision #1011

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6b69a5a
JSON encoder: Test several corner cases
abhinav Sep 10, 2021
af0cbd1
JSON encoder: Use correct precision for Complex64
abhinav Sep 10, 2021
7255fee
CHANGELOG: Add entry for this bugfix
abhinav Sep 10, 2021
e272362
benchmark cost of encoding float32, complex64
abhinav Sep 10, 2021
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8 changes: 6 additions & 2 deletions CHANGELOG.md
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Expand Up @@ -4,11 +4,15 @@ All notable changes to this project will be documented in this file.
This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).

## Unreleased
* No changes yet.

Bugfixes:
* [#1011][]: JSON: Fix inaccurate precision when encoding float64.

[#1011]: https://github.com/uber-go/zap/pull/1011

## 1.19.1 (8 Sep 2021)

### Fixed
Bugfixes:
* [#1001][]: JSON: Fix complex number encoding with negative imaginary part. Thanks to @hemantjadon.
* [#1003][]: JSON: Fix inaccurate precision when encoding float32.

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58 changes: 33 additions & 25 deletions zapcore/json_encoder.go
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Expand Up @@ -118,6 +118,11 @@ func (enc *jsonEncoder) AddComplex128(key string, val complex128) {
enc.AppendComplex128(val)
}

func (enc *jsonEncoder) AddComplex64(key string, val complex64) {
enc.addKey(key)
enc.AppendComplex64(val)
}

func (enc *jsonEncoder) AddDuration(key string, val time.Duration) {
enc.addKey(key)
enc.AppendDuration(val)
Expand Down Expand Up @@ -225,20 +230,23 @@ func (enc *jsonEncoder) AppendByteString(val []byte) {
enc.buf.AppendByte('"')
}

func (enc *jsonEncoder) AppendComplex128(val complex128) {
// appendComplex appends the encoded form of the provided complex128 value.
// precision specifies the encoding precision for the real and imaginary
// components of the complex number.
func (enc *jsonEncoder) appendComplex(val complex128, precision int) {
enc.addElementSeparator()
// Cast to a platform-independent, fixed-size type.
r, i := float64(real(val)), float64(imag(val))
enc.buf.AppendByte('"')
// Because we're always in a quoted string, we can use strconv without
// special-casing NaN and +/-Inf.
enc.buf.AppendFloat(r, 64)
enc.buf.AppendFloat(r, precision)
// If imaginary part is less than 0, minus (-) sign is added by default
// by AppendFloat.
if i >= 0 {
enc.buf.AppendByte('+')
}
enc.buf.AppendFloat(i, 64)
enc.buf.AppendFloat(i, precision)
enc.buf.AppendByte('i')
enc.buf.AppendByte('"')
}
Expand Down Expand Up @@ -301,28 +309,28 @@ func (enc *jsonEncoder) AppendUint64(val uint64) {
enc.buf.AppendUint(val)
}

func (enc *jsonEncoder) AddComplex64(k string, v complex64) { enc.AddComplex128(k, complex128(v)) }
func (enc *jsonEncoder) AddInt(k string, v int) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddInt32(k string, v int32) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddInt16(k string, v int16) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddInt8(k string, v int8) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddUint(k string, v uint) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUint32(k string, v uint32) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUint16(k string, v uint16) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUint8(k string, v uint8) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUintptr(k string, v uintptr) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AppendComplex64(v complex64) { enc.AppendComplex128(complex128(v)) }
func (enc *jsonEncoder) AppendFloat64(v float64) { enc.appendFloat(v, 64) }
func (enc *jsonEncoder) AppendFloat32(v float32) { enc.appendFloat(float64(v), 32) }
func (enc *jsonEncoder) AppendInt(v int) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendInt32(v int32) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendInt16(v int16) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendInt8(v int8) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendUint(v uint) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUint32(v uint32) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUint16(v uint16) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUint8(v uint8) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUintptr(v uintptr) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AddInt(k string, v int) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddInt32(k string, v int32) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddInt16(k string, v int16) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddInt8(k string, v int8) { enc.AddInt64(k, int64(v)) }
func (enc *jsonEncoder) AddUint(k string, v uint) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUint32(k string, v uint32) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUint16(k string, v uint16) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUint8(k string, v uint8) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AddUintptr(k string, v uintptr) { enc.AddUint64(k, uint64(v)) }
func (enc *jsonEncoder) AppendComplex64(v complex64) { enc.appendComplex(complex128(v), 32) }
func (enc *jsonEncoder) AppendComplex128(v complex128) { enc.appendComplex(complex128(v), 64) }
func (enc *jsonEncoder) AppendFloat64(v float64) { enc.appendFloat(v, 64) }
func (enc *jsonEncoder) AppendFloat32(v float32) { enc.appendFloat(float64(v), 32) }
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@sywhang sywhang Sep 10, 2021 •
edited

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Sorry, I should've probably commented on this when float32 encoding was being changed... But I think there may be a chance we're taking a performance hit here because now the payloads are not all 64-bits anymore, whereas before everything was 64 bits, so we may be taking a hit on alignment (and therefore cache locality+fragmentation for buffers in the pool).

Have we done any benchmarks with these changes? Just to be clear, I think incorrect encoding is still a bigger issue than a perf hit, but at least we should understand what impact it had. The perf impact may not be significant after all :)

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Fair. I'll add a benchmark and results.

func (enc *jsonEncoder) AppendInt(v int) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendInt32(v int32) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendInt16(v int16) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendInt8(v int8) { enc.AppendInt64(int64(v)) }
func (enc *jsonEncoder) AppendUint(v uint) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUint32(v uint32) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUint16(v uint16) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUint8(v uint8) { enc.AppendUint64(uint64(v)) }
func (enc *jsonEncoder) AppendUintptr(v uintptr) { enc.AppendUint64(uint64(v)) }

func (enc *jsonEncoder) Clone() Encoder {
clone := enc.clone()
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20 changes: 20 additions & 0 deletions zapcore/json_encoder_impl_test.go
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Expand Up @@ -121,32 +121,52 @@ func TestJSONEncoderObjectFields(t *testing.T) {
{"byteString", `"k":""`, func(e Encoder) { e.AddByteString("k", []byte{}) }},
{"byteString", `"k":""`, func(e Encoder) { e.AddByteString("k", nil) }},
{"complex128", `"k":"1+2i"`, func(e Encoder) { e.AddComplex128("k", 1+2i) }},
{"complex128/negative_i", `"k":"1-2i"`, func(e Encoder) { e.AddComplex128("k", 1-2i) }},
{"complex64", `"k":"1+2i"`, func(e Encoder) { e.AddComplex64("k", 1+2i) }},
{"complex64/negative_i", `"k":"1-2i"`, func(e Encoder) { e.AddComplex64("k", 1-2i) }},
{"complex64", `"k":"2.71+3.14i"`, func(e Encoder) { e.AddComplex64("k", 2.71+3.14i) }},
{"duration", `"k":0.000000001`, func(e Encoder) { e.AddDuration("k", 1) }},
{"duration/negative", `"k":-0.000000001`, func(e Encoder) { e.AddDuration("k", -1) }},
{"float64", `"k":1`, func(e Encoder) { e.AddFloat64("k", 1.0) }},
{"float64", `"k":10000000000`, func(e Encoder) { e.AddFloat64("k", 1e10) }},
{"float64", `"k":"NaN"`, func(e Encoder) { e.AddFloat64("k", math.NaN()) }},
{"float64", `"k":"+Inf"`, func(e Encoder) { e.AddFloat64("k", math.Inf(1)) }},
{"float64", `"k":"-Inf"`, func(e Encoder) { e.AddFloat64("k", math.Inf(-1)) }},
{"float64/pi", `"k":3.141592653589793`, func(e Encoder) { e.AddFloat64("k", math.Pi) }},
{"float32", `"k":1`, func(e Encoder) { e.AddFloat32("k", 1.0) }},
{"float32", `"k":2.71`, func(e Encoder) { e.AddFloat32("k", 2.71) }},
{"float32", `"k":0.1`, func(e Encoder) { e.AddFloat32("k", 0.1) }},
{"float32", `"k":10000000000`, func(e Encoder) { e.AddFloat32("k", 1e10) }},
{"float32", `"k":"NaN"`, func(e Encoder) { e.AddFloat32("k", float32(math.NaN())) }},
{"float32", `"k":"+Inf"`, func(e Encoder) { e.AddFloat32("k", float32(math.Inf(1))) }},
{"float32", `"k":"-Inf"`, func(e Encoder) { e.AddFloat32("k", float32(math.Inf(-1))) }},
{"float32/pi", `"k":3.1415927`, func(e Encoder) { e.AddFloat32("k", math.Pi) }},
{"int", `"k":42`, func(e Encoder) { e.AddInt("k", 42) }},
{"int64", `"k":42`, func(e Encoder) { e.AddInt64("k", 42) }},
{"int64/min", `"k":-9223372036854775808`, func(e Encoder) { e.AddInt64("k", math.MinInt64) }},
{"int64/max", `"k":9223372036854775807`, func(e Encoder) { e.AddInt64("k", math.MaxInt64) }},
{"int32", `"k":42`, func(e Encoder) { e.AddInt32("k", 42) }},
{"int32/min", `"k":-2147483648`, func(e Encoder) { e.AddInt32("k", math.MinInt32) }},
{"int32/max", `"k":2147483647`, func(e Encoder) { e.AddInt32("k", math.MaxInt32) }},
{"int16", `"k":42`, func(e Encoder) { e.AddInt16("k", 42) }},
{"int16/min", `"k":-32768`, func(e Encoder) { e.AddInt16("k", math.MinInt16) }},
{"int16/max", `"k":32767`, func(e Encoder) { e.AddInt16("k", math.MaxInt16) }},
{"int8", `"k":42`, func(e Encoder) { e.AddInt8("k", 42) }},
{"int8/min", `"k":-128`, func(e Encoder) { e.AddInt8("k", math.MinInt8) }},
{"int8/max", `"k":127`, func(e Encoder) { e.AddInt8("k", math.MaxInt8) }},
{"string", `"k":"v\\"`, func(e Encoder) { e.AddString(`k`, `v\`) }},
{"string", `"k":"v"`, func(e Encoder) { e.AddString("k", "v") }},
{"string", `"k":""`, func(e Encoder) { e.AddString("k", "") }},
{"time", `"k":1`, func(e Encoder) { e.AddTime("k", time.Unix(1, 0)) }},
{"uint", `"k":42`, func(e Encoder) { e.AddUint("k", 42) }},
{"uint64", `"k":42`, func(e Encoder) { e.AddUint64("k", 42) }},
{"uint64/max", `"k":18446744073709551615`, func(e Encoder) { e.AddUint64("k", math.MaxUint64) }},
{"uint32", `"k":42`, func(e Encoder) { e.AddUint32("k", 42) }},
{"uint32/max", `"k":4294967295`, func(e Encoder) { e.AddUint32("k", math.MaxUint32) }},
{"uint16", `"k":42`, func(e Encoder) { e.AddUint16("k", 42) }},
{"uint16/max", `"k":65535`, func(e Encoder) { e.AddUint16("k", math.MaxUint16) }},
{"uint8", `"k":42`, func(e Encoder) { e.AddUint8("k", 42) }},
{"uint8/max", `"k":255`, func(e Encoder) { e.AddUint8("k", math.MaxUint8) }},
{"uintptr", `"k":42`, func(e Encoder) { e.AddUintptr("k", 42) }},
{
desc: "object (success)",
Expand Down