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toml.go
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toml.go
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package gen
import (
"errors"
"fmt"
"strings"
"time"
"github.com/spf13/cast"
)
type SeriesLimit int64
func (s *SeriesLimit) UnmarshalTOML(data interface{}) error {
v, ok := data.(int64)
if !ok {
return errors.New("series-limit: invalid value")
}
if v < 0 {
return errors.New("series-limit: must be ≥ 0")
}
*s = SeriesLimit(v)
return nil
}
type sample float64
func (s *sample) UnmarshalTOML(data interface{}) error {
v, ok := data.(float64)
if !ok {
return errors.New("sample: must be a float")
}
if v <= 0 || v > 1.0 {
return errors.New("sample: must be 0 < sample ≤ 1.0")
}
*s = sample(v)
return nil
}
type duration struct {
time.Duration
}
func (d *duration) UnmarshalTOML(data interface{}) error {
text, ok := data.(string)
if !ok {
return fmt.Errorf("invalid duration, expect a Go duration as a string: %T", data)
}
return d.UnmarshalText([]byte(text))
}
func (d *duration) UnmarshalText(text []byte) error {
s := string(text)
var err error
d.Duration, err = time.ParseDuration(s)
if err != nil {
return err
}
if d.Duration == 0 {
d.Duration, err = time.ParseDuration("1" + s)
if err != nil {
return err
}
}
if d.Duration <= 0 {
return fmt.Errorf("invalid duration, must be > 0: %s", d.Duration)
}
return nil
}
type precision byte
const (
precisionMillisecond precision = iota // default
precisionNanosecond
precisionMicrosecond
precisionSecond
precisionMinute
precisionHour
)
var precisionToDuration = [...]time.Duration{
time.Millisecond,
time.Nanosecond,
time.Microsecond,
time.Second,
time.Minute,
time.Minute * 60,
time.Nanosecond,
time.Nanosecond,
}
func (p *precision) ToDuration() time.Duration {
return precisionToDuration[*p&0x7]
}
func (p *precision) UnmarshalTOML(data interface{}) error {
d, ok := data.(string)
if !ok {
return fmt.Errorf("invalid precision, expect one of (ns, us, ms, s, m, h): %T", data)
}
d = strings.ToLower(d)
switch d {
case "ns", "nanosecond":
*p = precisionNanosecond
case "us", "microsecond", "µs":
*p = precisionMicrosecond
case "ms", "millisecond":
*p = precisionMillisecond
case "s", "second":
*p = precisionSecond
case "m", "minute":
*p = precisionMinute
case "h", "hour":
*p = precisionHour
default:
return fmt.Errorf("invalid precision, expect one of (ns, ms, s, m, h): %s", d)
}
return nil
}
func (t *Tag) UnmarshalTOML(data interface{}) error {
d, ok := data.(map[string]interface{})
if !ok {
return nil
}
if n, ok := d["name"].(string); !ok || n == "" {
return errors.New("tag: missing or invalid value for name")
} else {
t.Name = n
}
// infer source
if _, ok := d["source"]; !ok {
return fmt.Errorf("missing source for tag %q", t.Name)
}
switch v := d["source"].(type) {
case int64, string, float64, bool:
if src, err := decodeTagConstantSource(v); err != nil {
return err
} else {
t.Source = src
}
case []interface{}:
if src, err := decodeTagArraySource(v); err != nil {
return err
} else {
t.Source = src
}
case map[string]interface{}:
if src, err := decodeTagSource(v); err != nil {
return err
} else {
t.Source = src
}
default:
return fmt.Errorf("invalid source for tag %q: %T", t.Name, v)
}
return nil
}
func decodeTagConstantSource(data interface{}) (TagSource, error) {
switch data.(type) {
case int64, string, float64, bool:
if src, err := cast.ToStringE(data); err != nil {
return nil, err
} else {
return &TagArraySource{Values: []string{src}}, nil
}
}
return nil, errors.New("invalid constant tag source")
}
func decodeTagArraySource(data []interface{}) (TagSource, error) {
if len(data) == 0 {
return nil, errors.New("empty array source")
}
if src, err := cast.ToStringSliceE(data); err != nil {
return nil, err
} else {
return &TagArraySource{Values: src}, nil
}
}
func decodeTagSource(data map[string]interface{}) (TagSource, error) {
typ, ok := data["type"].(string)
if !ok {
return nil, errors.New("missing type field")
}
switch typ {
case "sequence":
return decodeTagSequenceSource(data)
case "file":
return decodeTagFileSource(data)
default:
return nil, fmt.Errorf("invalid type field %q", typ)
}
}
func decodeTagFileSource(data map[string]interface{}) (TagSource, error) {
var s TagFileSource
if v, ok := data["path"].(string); ok {
s.Path = v
} else {
return nil, errors.New("file: missing path")
}
return &s, nil
}
func decodeTagSequenceSource(data map[string]interface{}) (TagSource, error) {
var s TagSequenceSource
if v, ok := data["format"].(string); ok {
// TODO(sgc): validate format string
s.Format = v
} else {
s.Format = "value%s"
}
if v, ok := data["start"]; ok {
if v, err := cast.ToInt64E(v); err != nil {
return nil, fmt.Errorf("tag.sequence: invalid start, %v", err)
} else if v < 0 {
return nil, fmt.Errorf("tag.sequence: start must be ≥ 0")
} else {
s.Start = v
}
}
if v, ok := data["count"]; ok {
if v, err := cast.ToInt64E(v); err != nil {
return nil, fmt.Errorf("tag.sequence: invalid count, %v", err)
} else if v < 0 {
return nil, fmt.Errorf("tag.sequence: count must be > 0")
} else {
s.Count = v
}
} else {
return nil, fmt.Errorf("tag.sequence: missing count")
}
return &s, nil
}
func (t *Field) UnmarshalTOML(data interface{}) error {
d, ok := data.(map[string]interface{})
if !ok {
return nil
}
if n, ok := d["name"].(string); !ok || n == "" {
return errors.New("field: missing or invalid value for name")
} else {
t.Name = n
}
if n, ok := d["count"]; !ok {
return errors.New("field: missing value for count")
} else if count, err := cast.ToInt64E(n); err != nil {
return fmt.Errorf("field: invalid count, %v", err)
} else if count <= 0 {
return errors.New("field: count must be > 0")
} else {
t.Count = count
}
if n, ok := d["time-precision"]; ok {
var tp precision
if err := tp.UnmarshalTOML(n); err != nil {
return err
}
t.TimePrecision = &tp
}
if n, ok := d["time-interval"]; ok {
var ti duration
if err := ti.UnmarshalTOML(n); err != nil {
return err
}
t.TimeInterval = &ti
t.TimePrecision = nil
}
if t.TimePrecision == nil && t.TimeInterval == nil {
var tp precision
t.TimePrecision = &tp
}
// infer source
if _, ok := d["source"]; !ok {
return fmt.Errorf("missing source for field %q", t.Name)
}
switch v := d["source"].(type) {
case int64, string, float64, bool:
t.Source = &FieldConstantValue{v}
case []interface{}:
if src, err := decodeFieldArraySource(v); err != nil {
return err
} else {
t.Source = src
}
case map[string]interface{}:
if src, err := decodeFieldSource(v); err != nil {
return err
} else {
t.Source = src
}
default:
// unknown
return fmt.Errorf("invalid source for tag %q: %T", t.Name, v)
}
return nil
}
func decodeFieldArraySource(data []interface{}) (FieldSource, error) {
if len(data) == 0 {
return nil, errors.New("empty array")
}
var (
src interface{}
err error
)
// use first value to determine slice type
switch data[0].(type) {
case int64:
src, err = toInt64SliceE(data)
case float64:
src, err = toFloat64SliceE(data)
case string:
src, err = cast.ToStringSliceE(data)
case bool:
src, err = cast.ToBoolSliceE(data)
default:
err = fmt.Errorf("unsupported field source data type: %T", data[0])
}
if err != nil {
return nil, err
}
return &FieldArraySource{Value: src}, nil
}
func decodeFieldSource(data map[string]interface{}) (FieldSource, error) {
typ, ok := data["type"].(string)
if !ok {
return nil, errors.New("missing type field")
}
switch typ {
case "rand<float>":
return decodeFloatRandomSource(data)
case "zipf<integer>":
return decodeIntegerZipfSource(data)
default:
return nil, fmt.Errorf("invalid type field %q", typ)
}
}
func decodeFloatRandomSource(data map[string]interface{}) (FieldSource, error) {
var s FieldFloatRandomSource
if v, ok := data["seed"]; ok {
if v, err := cast.ToInt64E(v); err != nil {
return nil, fmt.Errorf("rand<float>: invalid seed, %v", err)
} else {
s.Seed = v
}
}
if v, ok := data["min"]; ok {
if v, err := cast.ToFloat64E(v); err != nil {
return nil, fmt.Errorf("rand<float>: invalid min, %v", err)
} else {
s.Min = v
}
}
if v, ok := data["max"]; ok {
if v, err := cast.ToFloat64E(v); err != nil {
return nil, fmt.Errorf("rand<float>: invalid max, %v", err)
} else {
s.Max = v
}
} else {
s.Max = 1.0
}
if !(s.Min <= s.Max) {
return nil, errors.New("rand<float>: min ≤ max")
}
return &s, nil
}
func decodeIntegerZipfSource(data map[string]interface{}) (FieldSource, error) {
var s FieldIntegerZipfSource
if v, ok := data["seed"]; ok {
if v, err := cast.ToInt64E(v); err != nil {
return nil, fmt.Errorf("zipf<integer>: invalid seed, %v", err)
} else {
s.Seed = v
}
}
if v, ok := data["s"]; ok {
if v, err := cast.ToFloat64E(v); err != nil || v <= 1.0 {
return nil, fmt.Errorf("zipf<integer>: invalid value for s (s > 1), %v", err)
} else {
s.S = v
}
} else {
return nil, fmt.Errorf("zipf<integer>: missing value for s")
}
if v, ok := data["v"]; ok {
if v, err := cast.ToFloat64E(v); err != nil || v < 1.0 {
return nil, fmt.Errorf("zipf<integer>: invalid value for v (v ≥ 1), %v", err)
} else {
s.V = v
}
} else {
return nil, fmt.Errorf("zipf<integer>: missing value for v")
}
if v, ok := data["imax"]; ok {
if v, err := cast.ToUint64E(v); err != nil {
return nil, fmt.Errorf("zipf<integer>: invalid value for imax, %v", err)
} else {
s.IMAX = v
}
} else {
return nil, fmt.Errorf("zipf<integer>: missing value for imax")
}
return &s, nil
}