tongtongstudio
eb18c59a54
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84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// Package config 提供轻量的运行时配置辅助能力。
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//
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// 后端只从环境变量读取配置；为方便本地开发（不依赖启动脚本注入），
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// 这里提供一个零依赖的 .env 加载器，供 server / migrate-schema 等命令共用。
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package config
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import (
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"bufio"
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"log"
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"os"
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"path/filepath"
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"strings"
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)
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// LoadDotEnv 从若干候选路径读取 .env 并注入进程环境变量。
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//
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// 规则：
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// - 已存在的环境变量优先，不会被覆盖（Docker/脚本注入的值始终生效）；
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// - 跳过空行与 # 注释，兼容 export 前缀与首尾引号；
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// - 找不到 .env 时静默跳过，不影响生产部署。
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func LoadDotEnv() {
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path := findDotEnvPath()
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if path == "" {
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return
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}
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file, err := os.Open(path)
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if err != nil {
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return
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}
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defer file.Close()
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log.Printf("已从 %s 加载 .env 配置（已存在的环境变量优先，不覆盖）", path)
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scanner := bufio.NewScanner(file)
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// 连接串可能较长，放宽单行上限
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scanner.Buffer(make([]byte, 0, 64*1024), 1024*1024)
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for scanner.Scan() {
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line := strings.TrimPrefix(scanner.Text(), "\ufeff") // 去掉可能的 UTF-8 BOM
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line = strings.TrimSpace(line)
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if line == "" || strings.HasPrefix(line, "#") {
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continue
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}
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line = strings.TrimSpace(strings.TrimPrefix(line, "export "))
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idx := strings.IndexByte(line, '=')
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if idx <= 0 {
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continue
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}
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key := strings.TrimSpace(line[:idx])
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value := strings.TrimSpace(line[idx+1:])
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if len(value) >= 2 && value[0] == '"' && value[len(value)-1] == '"' {
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value = value[1 : len(value)-1]
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}
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if key == "" {
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continue
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}
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if _, exists := os.LookupEnv(key); exists {
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continue
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}
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_ = os.Setenv(key, value)
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}
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}
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// findDotEnvPath 依次查找：显式指定的 CANVAS_ENV_FILE、当前目录、上级目录、上上级目录。
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func findDotEnvPath() string {
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if explicit := strings.TrimSpace(os.Getenv("CANVAS_ENV_FILE")); explicit != "" {
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if info, err := os.Stat(explicit); err == nil && !info.IsDir() {
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return explicit
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}
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}
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candidates := []string{
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".env",
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filepath.Join("..", ".env"),
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filepath.Join("..", "..", ".env"),
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}
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for _, candidate := range candidates {
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if info, err := os.Stat(candidate); err == nil && !info.IsDir() {
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return candidate
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}
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}
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return ""
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}
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