Move duration and size to units pkg

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Michael Crosby 2014-05-12 16:40:19 -07:00
parent fa0e7c2ec2
commit 68928c3485
4 changed files with 143 additions and 0 deletions

2
units/MAINTAINERS Normal file
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Michael Crosby <michael@crosbymichael.com> (@crosbymichael)
Victor Vieux <vieux@docker.com> (@vieux)

31
units/duration.go Normal file
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package units
import (
"fmt"
"time"
)
// HumanDuration returns a human-readable approximation of a duration
// (eg. "About a minute", "4 hours ago", etc.)
func HumanDuration(d time.Duration) string {
if seconds := int(d.Seconds()); seconds < 1 {
return "Less than a second"
} else if seconds < 60 {
return fmt.Sprintf("%d seconds", seconds)
} else if minutes := int(d.Minutes()); minutes == 1 {
return "About a minute"
} else if minutes < 60 {
return fmt.Sprintf("%d minutes", minutes)
} else if hours := int(d.Hours()); hours == 1 {
return "About an hour"
} else if hours < 48 {
return fmt.Sprintf("%d hours", hours)
} else if hours < 24*7*2 {
return fmt.Sprintf("%d days", hours/24)
} else if hours < 24*30*3 {
return fmt.Sprintf("%d weeks", hours/24/7)
} else if hours < 24*365*2 {
return fmt.Sprintf("%d months", hours/24/30)
}
return fmt.Sprintf("%f years", d.Hours()/24/365)
}

56
units/size.go Normal file
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package units
import (
"fmt"
"regexp"
"strconv"
"strings"
)
// HumanSize returns a human-readable approximation of a size
// using SI standard (eg. "44kB", "17MB")
func HumanSize(size int64) string {
i := 0
var sizef float64
sizef = float64(size)
units := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
for sizef >= 1000.0 {
sizef = sizef / 1000.0
i++
}
return fmt.Sprintf("%.4g %s", sizef, units[i])
}
// Parses a human-readable string representing an amount of RAM
// in bytes, kibibytes, mebibytes or gibibytes, and returns the
// number of bytes, or -1 if the string is unparseable.
// Units are case-insensitive, and the 'b' suffix is optional.
func RAMInBytes(size string) (bytes int64, err error) {
re, error := regexp.Compile("^(\\d+)([kKmMgG])?[bB]?$")
if error != nil {
return -1, error
}
matches := re.FindStringSubmatch(size)
if len(matches) != 3 {
return -1, fmt.Errorf("Invalid size: '%s'", size)
}
memLimit, error := strconv.ParseInt(matches[1], 10, 0)
if error != nil {
return -1, error
}
unit := strings.ToLower(matches[2])
if unit == "k" {
memLimit *= 1024
} else if unit == "m" {
memLimit *= 1024 * 1024
} else if unit == "g" {
memLimit *= 1024 * 1024 * 1024
}
return memLimit, nil
}

54
units/size_test.go Normal file
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package units
import (
"strings"
"testing"
)
func TestHumanSize(t *testing.T) {
size := strings.Trim(HumanSize(1000), " \t")
expect := "1 kB"
if size != expect {
t.Errorf("1000 -> expected '%s', got '%s'", expect, size)
}
size = strings.Trim(HumanSize(1024), " \t")
expect = "1.024 kB"
if size != expect {
t.Errorf("1024 -> expected '%s', got '%s'", expect, size)
}
}
func TestRAMInBytes(t *testing.T) {
assertRAMInBytes(t, "32", false, 32)
assertRAMInBytes(t, "32b", false, 32)
assertRAMInBytes(t, "32B", false, 32)
assertRAMInBytes(t, "32k", false, 32*1024)
assertRAMInBytes(t, "32K", false, 32*1024)
assertRAMInBytes(t, "32kb", false, 32*1024)
assertRAMInBytes(t, "32Kb", false, 32*1024)
assertRAMInBytes(t, "32Mb", false, 32*1024*1024)
assertRAMInBytes(t, "32Gb", false, 32*1024*1024*1024)
assertRAMInBytes(t, "", true, -1)
assertRAMInBytes(t, "hello", true, -1)
assertRAMInBytes(t, "-32", true, -1)
assertRAMInBytes(t, " 32 ", true, -1)
assertRAMInBytes(t, "32 mb", true, -1)
assertRAMInBytes(t, "32m b", true, -1)
assertRAMInBytes(t, "32bm", true, -1)
}
func assertRAMInBytes(t *testing.T, size string, expectError bool, expectedBytes int64) {
actualBytes, err := RAMInBytes(size)
if (err != nil) && !expectError {
t.Errorf("Unexpected error parsing '%s': %s", size, err)
}
if (err == nil) && expectError {
t.Errorf("Expected to get an error parsing '%s', but got none (bytes=%d)", size, actualBytes)
}
if actualBytes != expectedBytes {
t.Errorf("Expected '%s' to parse as %d bytes, got %d", size, expectedBytes, actualBytes)
}
}