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nodestate.go
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/
nodestate.go
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package config
import (
"fmt"
"os"
"strconv"
"strings"
)
var DEFAULT_PRIMARY_PORT = 5000
var DEFAULT_BACKUP_PORT = 50000
var ROLE_ENV_VAR = "ROLE"
var PORT_ENV_VAR = "PORT"
var BACKUP_PORT_ENV_VAR = "BACKUP_PORT"
var ROLE = ""
func IsPrimary() bool {
if ROLE != "" {
return ROLE == "primary"
}
role, gotten := os.LookupEnv(ROLE_ENV_VAR)
if !gotten {
fmt.Fprintln(os.Stderr, "No ROLE environment variable")
os.Exit(1)
}
role = strings.TrimSpace(role)
ROLE = role
if role == "primary" {
return true
}
if role != "backup" {
fmt.Fprint(os.Stderr, role)
fmt.Fprint(os.Stderr, "backup")
fmt.Fprintf(
os.Stderr,
"Invalid ROLE environment variable, needs primary/backup got: %s\n",
role,
)
os.Exit(1)
}
return false
}
func GetName() string {
if IsPrimary() {
return "primary"
}
return "backup"
}
func GetPort() int {
portStr, gotten := os.LookupEnv(PORT_ENV_VAR)
if !gotten {
return getDefaultPort()
}
port, err := strconv.Atoi(strings.TrimSpace(portStr))
if err != nil {
return getDefaultPort()
}
return port
}
func getDefaultPort() int {
if IsPrimary() {
return DEFAULT_PRIMARY_PORT
}
return DEFAULT_BACKUP_PORT
}
func GetBackupPort() int {
portStr, gotten := os.LookupEnv(BACKUP_PORT_ENV_VAR)
if !gotten {
return DEFAULT_BACKUP_PORT
}
port, err := strconv.Atoi(strings.TrimSpace(portStr))
if err != nil {
return DEFAULT_BACKUP_PORT
}
return port
}