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39 lines
1.1 KiB
Go
39 lines
1.1 KiB
Go
//go:build !production
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package application
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import (
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"errors"
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"github.com/wailsapp/wails/v3/internal/assetserver"
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"net/http"
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"time"
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)
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func (a *App) preRun() error {
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// Check for frontend server url
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frontendURL := assetserver.GetDevServerURL()
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if frontendURL != "" {
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// We want to check if the frontend server is running by trying to http get the url
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// and if it is not, we wait 500ms and try again for a maximum of 10 times. If it is
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// still not available, we return an error.
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// This is to allow the frontend server to start up before the backend server.
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client := http.Client{}
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a.Logger.Info("Waiting for frontend dev server to start...", "url", frontendURL)
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for i := 0; i < 10; i++ {
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_, err := client.Get(frontendURL)
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if err == nil {
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a.Logger.Info("Connected to frontend dev server!")
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return nil
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}
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// Wait 500ms
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time.Sleep(500 * time.Millisecond)
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if i%2 == 0 {
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a.Logger.Info("Retrying...")
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}
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}
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a.Logger.Info("failed!")
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return errors.New("unable to connect to frontend server. Please check it is running")
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}
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return nil
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}
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