145 lines
3.2 KiB
Go
145 lines
3.2 KiB
Go
package nomad
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import (
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"fmt"
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"math"
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"math/big"
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"math/rand"
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"net"
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"os"
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"path/filepath"
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"runtime"
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"strconv"
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"time"
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crand "crypto/rand"
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"github.com/hashicorp/serf/serf"
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)
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// ensurePath is used to make sure a path exists
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func ensurePath(path string, dir bool) error {
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if !dir {
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path = filepath.Dir(path)
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}
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return os.MkdirAll(path, 0755)
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}
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// RuntimeStats is used to return various runtime information
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func RuntimeStats() map[string]string {
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return map[string]string{
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"kernel.name": runtime.GOOS,
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"arch": runtime.GOARCH,
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"version": runtime.Version(),
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"max_procs": strconv.FormatInt(int64(runtime.GOMAXPROCS(0)), 10),
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"goroutines": strconv.FormatInt(int64(runtime.NumGoroutine()), 10),
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"cpu_count": strconv.FormatInt(int64(runtime.NumCPU()), 10),
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}
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}
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// serverParts is used to return the parts of a server role
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type serverParts struct {
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Name string
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Region string
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Datacenter string
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Port int
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Bootstrap bool
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Expect int
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Version int
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Addr net.Addr
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}
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func (s *serverParts) String() string {
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return fmt.Sprintf("%s (Addr: %s) (DC: %s)",
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s.Name, s.Addr, s.Datacenter)
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}
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// Returns if a member is a Nomad server. Returns a boolean,
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// and a struct with the various important components
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func isNomadServer(m serf.Member) (bool, *serverParts) {
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if m.Tags["role"] != "nomad" {
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return false, nil
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}
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region := m.Tags["region"]
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datacenter := m.Tags["dc"]
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_, bootstrap := m.Tags["bootstrap"]
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expect := 0
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expect_str, ok := m.Tags["expect"]
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var err error
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if ok {
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expect, err = strconv.Atoi(expect_str)
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if err != nil {
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return false, nil
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}
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}
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port_str := m.Tags["port"]
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port, err := strconv.Atoi(port_str)
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if err != nil {
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return false, nil
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}
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vsn_str := m.Tags["vsn"]
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vsn, err := strconv.Atoi(vsn_str)
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if err != nil {
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return false, nil
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}
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addr := &net.TCPAddr{IP: m.Addr, Port: port}
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parts := &serverParts{
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Name: m.Name,
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Region: region,
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Datacenter: datacenter,
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Port: port,
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Bootstrap: bootstrap,
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Expect: expect,
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Addr: addr,
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Version: vsn,
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}
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return true, parts
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}
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// Returns a random stagger interval between 0 and the duration
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func randomStagger(intv time.Duration) time.Duration {
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return time.Duration(uint64(rand.Int63()) % uint64(intv))
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}
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// shuffleStrings randomly shuffles the list of strings
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func shuffleStrings(list []string) {
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for i := range list {
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j := rand.Intn(i + 1)
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list[i], list[j] = list[j], list[i]
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}
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}
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// maxUint64 returns the maximum value
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func maxUint64(a, b uint64) uint64 {
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if a >= b {
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return a
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}
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return b
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}
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// rateScaledInterval is used to choose an interval to perform an action in order
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// to target an aggregate number of actions per second across the whole cluster.
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func rateScaledInterval(rate float64, min time.Duration, n int) time.Duration {
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interval := time.Duration(float64(time.Second) * float64(n) / rate)
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if interval < min {
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return min
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}
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return interval
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}
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// seedRandom seeds the global random variable using a cryptographically random
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// seed. It returns an error if determing the random seed fails.
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func seedRandom() error {
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n, err := crand.Int(crand.Reader, big.NewInt(math.MaxInt64))
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if err != nil {
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return err
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}
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rand.Seed(n.Int64())
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return nil
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}
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