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CNCF/devstatscode

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env.go 2.54 KB
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package devstatscode
import (
"bufio"
"fmt"
"os"
"sort"
"strings"
"time"
)
var gEnvMap map[string]string = make(map[string]string)
// EnvSyncer - support auto updating env variables via "env.env" file
func EnvSyncer() {
for {
time.Sleep(30 * time.Second)
UpdateEnv(true)
}
}
// UpdateEnv - update (eventually) env using env.env file
func UpdateEnv(useLog bool) {
ef, err := os.Open("env.env")
if err != nil {
return
}
defer ef.Close()
sc := bufio.NewScanner(ef)
for sc.Scan() {
line := sc.Text()
ary := strings.Split(line, "=")
if len(ary) < 2 {
continue
}
k := strings.TrimSpace(ary[0])
if k == "" {
continue
}
// v := strings.TrimSpace(ary[1])
v := strings.TrimSpace(strings.Join(ary[1:], "="))
os.Setenv(k, v)
cv, ok := gEnvMap[k]
if !ok || cv != v {
if useLog {
if IsLogInitialized() {
Printf("new environment overwrite: '%s' --> '%s'\n", k, v)
}
} else {
fmt.Printf("new environment overwrite: '%s' --> '%s'\n", k, v)
}
}
gEnvMap[k] = v
}
}
// EnvReplace - replace all environment variables starting with "prefix"
// with contents of variables with "suffix" added - if defined
// If prefix is "DB_" and suffix is "_SRC" then:
// So if there is "DB_HOST_SRC" variable defined - it will replace "DB_HOST" and so on
func EnvReplace(prefix, suffix string) map[string]string {
if suffix == "" {
return map[string]string{}
}
oldEnv := make(map[string]string)
var environ []string
for _, e := range os.Environ() {
environ = append(environ, e)
}
sort.Strings(environ)
pLen := len(prefix)
for _, e := range environ {
l := pLen
eLen := len(e)
if l > eLen {
l = eLen
}
if pLen == 0 || e[0:l] == prefix {
pair := strings.Split(e, "=")
eSuff := os.Getenv(pair[0] + suffix)
if eSuff != "" {
oldEnv[pair[0]] = pair[1]
FatalOnError(os.Setenv(pair[0], eSuff))
}
}
}
sLen := len(suffix)
for _, e := range environ {
pair := strings.Split(e, "=")
eLen := len(pair[0])
lS := eLen - sLen
if lS <= 0 {
continue
}
lP := pLen
if lP > eLen {
lP = eLen
}
if (pLen == 0 || e[0:lP] == prefix) && pair[0][lS:] == suffix {
eName := pair[0][:lS]
_, ok := oldEnv[eName]
if !ok {
oldEnv[eName] = Unset
FatalOnError(os.Setenv(eName, pair[1]))
}
}
}
return oldEnv
}
// EnvRestore - restores all environment variables given in the map
func EnvRestore(env map[string]string) {
for envName, envValue := range env {
if envValue == Unset {
FatalOnError(os.Unsetenv(envName))
} else {
FatalOnError(os.Setenv(envName, envValue))
}
}
}
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https://gitee.com/cncf/devstatscode.git
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cncf
devstatscode
devstatscode
master

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