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64 lines
1.2 KiB
64 lines
1.2 KiB
package env
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import (
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"os"
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"strings"
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"sync"
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)
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var (
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privateMutex sync.RWMutex
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envOff bool
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)
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// SetEnvOff - turns off env lookup
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func SetEnvOff() {
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privateMutex.Lock()
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defer privateMutex.Unlock()
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envOff = true
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}
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// SetEnvOn - turns on env lookup
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func SetEnvOn() {
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privateMutex.Lock()
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defer privateMutex.Unlock()
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envOff = false
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}
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// IsSet returns if the given env key is set.
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func IsSet(key string) bool {
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_, ok := os.LookupEnv(key)
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return ok
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}
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// Get retrieves the value of the environment variable named
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// by the key. If the variable is present in the environment the
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// value (which may be empty) is returned. Otherwise it returns
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// the specified default value.
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func Get(key, defaultValue string) string {
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privateMutex.RLock()
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ok := envOff
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privateMutex.RUnlock()
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if ok {
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return defaultValue
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}
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if v, ok := os.LookupEnv(key); ok {
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return v
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}
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return defaultValue
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}
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// List all envs with a given prefix.
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func List(prefix string) (envs []string) {
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for _, env := range os.Environ() {
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if strings.HasPrefix(env, prefix) {
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values := strings.SplitN(env, "=", 2)
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if len(values) == 2 {
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envs = append(envs, values[0])
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}
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}
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}
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return envs
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}
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