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package mapr
import (
"context"
"errors"
"fmt"
"io/ioutil"
"os"
"sort"
"strconv"
"strings"
"github.com/mimecast/dtail/internal/io/logger"
)
// GroupSet represents a map of aggregate sets. The group sets
// are requierd by the "group by" mapr clause, whereas the
// group set map keys are the values of the "group by" arguments.
// E.g. "group by $cid" would create one aggregate set and one map
// entry per customer id.
type GroupSet struct {
sets map[string]*AggregateSet
}
// NewGroupSet returns a new empty group set.
func NewGroupSet() *GroupSet {
g := GroupSet{}
g.InitSet()
return &g
}
// String representation of the group set.
func (g *GroupSet) String() string {
return fmt.Sprintf("GroupSet(%v)", g.sets)
}
// InitSet makes the group set empty (initialize).
func (g *GroupSet) InitSet() {
g.sets = make(map[string]*AggregateSet)
}
// GetSet gets a specific aggregate set from the group set.
func (g *GroupSet) GetSet(groupKey string) *AggregateSet {
set, ok := g.sets[groupKey]
if !ok {
set = NewAggregateSet()
g.sets[groupKey] = set
}
return set
}
// Serialize the group set (e.g. to send it over the wire).
func (g *GroupSet) Serialize(ctx context.Context, ch chan<- string) {
for groupKey, set := range g.sets {
set.Serialize(ctx, groupKey, ch)
}
}
// Result returns a nicely formated result of the query from the group set.
func (g *GroupSet) Result(query *Query) (string, int, error) {
return g.limitedResult(query, query.Limit, "\t", " ", false)
}
// WriteResult writes the result to an outfile.
func (g *GroupSet) WriteResult(query *Query) error {
if !query.HasOutfile() {
return errors.New("No outfile specified")
}
// -1: Don't limit the result, include all data sets
result, _, err := g.limitedResult(query, -1, "", ",", true)
if err != nil {
return err
}
logger.Info("Writing outfile", query.Outfile)
tmpOutfile := fmt.Sprintf("%s.tmp", query.Outfile)
if err := ioutil.WriteFile(tmpOutfile, []byte(result), 0644); err != nil {
return err
}
if err := os.Rename(tmpOutfile, query.Outfile); err != nil {
os.Remove(tmpOutfile)
return err
}
return nil
}
// Return a nicely formated result of the query from the group set.
func (g *GroupSet) limitedResult(query *Query, limit int, lineStarter, fieldSeparator string, addHeader bool) (string, int, error) {
type result struct {
groupKey string
resultStr string
orderBy float64
}
var resultSlice []result
for groupKey, set := range g.sets {
var sb strings.Builder
r := result{groupKey: groupKey}
lastIndex := len(query.Select) - 1
for i, sc := range query.Select {
storage := sc.FieldStorage
orderByThis := storage == query.OrderBy
switch sc.Operation {
case Count:
value := set.FValues[storage]
sb.WriteString(fmt.Sprintf("%d", int(value)))
if orderByThis {
r.orderBy = value
}
case Len:
fallthrough
case Sum:
fallthrough
case Min:
fallthrough
case Max:
value := set.FValues[storage]
sb.WriteString(fmt.Sprintf("%f", value))
if orderByThis {
r.orderBy = value
}
case Last:
value := set.SValues[storage]
if orderByThis {
f, err := strconv.ParseFloat(value, 64)
if err == nil {
r.orderBy = f
}
}
sb.WriteString(value)
case Avg:
value := set.FValues[storage] / float64(set.Samples)
sb.WriteString(fmt.Sprintf("%f", value))
if orderByThis {
r.orderBy = value
}
default:
return "", 0, fmt.Errorf("Unknown aggregation method '%v'", sc.Operation)
}
if i != lastIndex {
sb.WriteString(fieldSeparator)
}
}
r.resultStr = sb.String()
resultSlice = append(resultSlice, r)
}
if query.OrderBy != "" {
if query.ReverseOrder {
sort.SliceStable(resultSlice, func(i, j int) bool {
return resultSlice[i].orderBy < resultSlice[j].orderBy
})
} else {
sort.SliceStable(resultSlice, func(i, j int) bool {
return resultSlice[i].orderBy > resultSlice[j].orderBy
})
}
}
var sb strings.Builder
// Write header first
if addHeader {
lastIndex := len(query.Select) - 1
sb.WriteString(lineStarter)
for i, sc := range query.Select {
sb.WriteString(sc.FieldStorage)
if i != lastIndex {
sb.WriteString(fieldSeparator)
}
}
sb.WriteString("\n")
}
// And now write the data
for i, r := range resultSlice {
if i == limit {
break
}
sb.WriteString(lineStarter)
sb.WriteString(r.resultStr)
sb.WriteString("\n")
}
return sb.String(), len(resultSlice), nil
}
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