/
merki.go
198 lines (181 loc) · 4.2 KB
/
merki.go
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package merki
import (
"encoding/csv"
"fmt"
"io"
"sort"
"time"
"github.com/guptarohit/asciigraph"
"github.com/joliv/spark"
)
type Merki struct {
delimiter rune
output io.Writer
}
func New(delimiter rune, o io.Writer) *Merki {
return &Merki{delimiter, o}
}
func (m *Merki) AddRecord(w io.Writer, record *Record) error {
wr := csv.NewWriter(w)
wr.Comma = m.delimiter
if err := wr.Write(record.getStrings(false)); err != nil {
return err
}
wr.Flush()
return wr.Error()
}
func getMeasureValues(r io.Reader, delimiter rune, measure string) ([]float64, error) {
var values []float64
err := ParseCallback(r, delimiter, func(record *Record, err error) (bool, error) {
if err != nil {
return true, err
}
if record.Measurement == measure {
values = append(values, record.Value)
}
return false, nil
})
return values, err
}
func (m *Merki) DrawGraph(r io.Reader, measure string) (string, error) {
values, err := getMeasureValues(r, m.delimiter, measure)
if err != nil || len(values) == 0 {
return "", err
}
graph := asciigraph.Plot(values, asciigraph.Width(80))
return graph, err
}
func (m *Merki) DrawSparkLine(r io.Reader, measure string) (string, error) {
values, err := getMeasureValues(r, m.delimiter, measure)
if err != nil {
return "", err
}
return spark.Line(values), nil
}
func (m *Merki) Measurements(r io.Reader) error {
measures := make(map[string]bool)
err := ParseCallback(r, m.delimiter, func(record *Record, err error) (bool, error) {
if err != nil {
return true, err
}
measures[record.Measurement] = true
return false, nil
})
if err != nil {
return err
}
for name := range measures {
if _, err = fmt.Fprintln(m.output, name); err != nil {
return err
}
}
return err
}
func (m *Merki) Latest(r io.Reader) error {
w := csv.NewWriter(m.output)
w.Comma = m.delimiter
list := make(map[string]*Record)
var ss sort.StringSlice
err := ParseCallback(r, m.delimiter, func(record *Record, err error) (bool, error) {
if err != nil {
return true, err
}
key := record.Measurement
val, ok := list[key]
if !ok {
list[key] = record
ss = append(ss, key)
} else if record.Date.After(val.Date) {
list[key] = record
}
return false, nil
})
if err != nil {
return err
}
ss.Sort()
for _, key := range ss {
r := list[key]
if err := w.Write(r.getStrings(true)); err != nil {
return err
}
}
w.Flush()
return w.Error()
}
func (m *Merki) Filter(r io.Reader, measure string, gi GroupingInterval, gt GroupingType) error {
w := csv.NewWriter(m.output)
w.Comma = m.delimiter
filter := newFilter(w, measure, gi, gt)
err := ParseCallback(r, m.delimiter, func(record *Record, err error) (bool, error) {
if err != nil {
return true, err
}
if err = filter.Add(record); err != nil {
return true, err
}
return false, nil
})
if err != nil {
return err
}
if err = filter.print(); err != nil {
return err
}
w.Flush()
return w.Error()
}
func formatDuration(d time.Duration, r RoundType) string {
if r == RoundDays {
return fmt.Sprintf(formatFloat, d.Hours()/24)
}
if r == RoundHours {
return fmt.Sprintf(formatFloat, d.Hours())
}
if r == RoundMinutes {
return fmt.Sprintf(formatFloat, d.Minutes())
}
return fmt.Sprintf("%d", int(d.Seconds()))
}
func (m *Merki) Interval(r io.Reader, measure string, round RoundType) error {
w := csv.NewWriter(m.output)
w.Comma = m.delimiter
var startTime *time.Time
var duration time.Duration
var lastRecord *Record
err := ParseCallback(r, m.delimiter, func(record *Record, err error) (bool, error) {
if err != nil {
return true, err
}
if record.Measurement == measure {
lastRecord = record
if startTime != nil {
duration = record.Date.Sub(*startTime)
if err := w.Write([]string{
record.Date.Format(formatDate),
measure,
formatDuration(duration, round),
}); err != nil {
return true, err
}
}
startTime = &record.Date
}
return false, nil
})
if err != nil {
return err
}
if startTime != nil && lastRecord != nil {
duration = time.Since(*startTime)
if err = w.Write([]string{
lastRecord.Date.Format(formatDate),
measure,
formatDuration(duration, round),
}); err != nil {
return err
}
}
w.Flush()
return w.Error()
}