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main.go
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main.go
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// Copyright 2017 Fortio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// histogram : reads values from stdin and outputs an histogram
package main
import (
"bufio"
"encoding/json"
"flag"
"fmt"
"os"
"strconv"
"fortio.org/fortio/stats"
"fortio.org/log"
)
func main() {
var (
offsetFlag = flag.Float64("offset", 0.0, "Offset for the data")
dividerFlag = flag.Float64("divider", 1, "Divider/scaling for the data")
percentilesFlag = flag.String("p", "50,75,99,99.9", "List of pXX to calculate")
jsonFlag = flag.Bool("json", false, "Json output")
)
flag.Parse()
h := stats.NewHistogram(*offsetFlag, *dividerFlag)
percList, err := stats.ParsePercentiles(*percentilesFlag)
if err != nil {
log.Fatalf("Unable to extract percentiles from -p: %v", err)
}
scanner := bufio.NewScanner(os.Stdin)
linenum := 1
for scanner.Scan() {
line := scanner.Text()
v, err := strconv.ParseFloat(line, 64)
if err != nil {
log.Fatalf("Can't parse line %d: %v", linenum, err)
}
h.Record(v)
linenum++
}
if err := scanner.Err(); err != nil {
log.Fatalf("Err reading standard input %v", err)
}
if *jsonFlag {
b, err := json.MarshalIndent(h.Export().CalcPercentiles(percList), "", " ")
if err != nil {
log.Fatalf("Unable to create Json: %v", err)
}
fmt.Print(string(b))
} else {
h.Print(os.Stdout, "Histogram", percList)
}
}