78 lines
1.5 KiB
Go
78 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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"net/http"
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"os"
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"reflect"
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"github.com/gin-gonic/gin"
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"github.com/pelletier/go-toml/v2"
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log "github.com/sirupsen/logrus"
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)
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var AppConfig Config
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func main() {
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if len(os.Args) != 2 {
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AppConfig.Mode = "env"
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} else {
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AppConfig.Mode = "argv"
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}
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err := InitConfig()
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if err != nil {
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log.Fatalf("Failed to init config: %v\n", err)
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}
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r := gin.Default()
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r.LoadHTMLGlob("templates/*")
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r.GET("/", func(c *gin.Context) {
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c.HTML(http.StatusOK, "index.html", gin.H{
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"title": "Welcome Page",
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"message": "Hello, Gin with HTML templates!",
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})
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})
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r.Run(":8080")
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}
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func InitConfig() error {
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if AppConfig.Mode == "argv" {
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content, err := os.ReadFile(os.Args[1])
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if err != nil {
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return err
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}
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toml.Unmarshal(content, &AppConfig)
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fmt.Printf("%+v\n", AppConfig)
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return nil
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} else if AppConfig.Mode == "env" {
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f := reflect.ValueOf(AppConfig)
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for i := 0; i < f.NumField(); i++ {
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field := f.Type().Field(i)
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tag := field.Tag
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env_var := tag.Get("env")
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fmt.Printf("Field: %v.\nEnvironment variable: %v.\n", field.Name, env_var)
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if env_var != "" {
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env_value, exists := os.LookupEnv(env_var)
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if !exists {
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return fmt.Errorf("there is no env variable %s", env_var)
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}
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err := setField(&AppConfig, field.Name, env_value)
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if err != nil {
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return fmt.Errorf("failed to set config field %s: %v", field.Name, err)
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}
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}
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}
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return nil
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} else {
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return fmt.Errorf("incorrect config mode")
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}
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}
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