Confused in the below code lines

[anpolychrono]

I am bit confused with the lines under the comment "wake up the function ?", why you are calling the newRequest() again and then you are calling the http.Do() twice ?

file : petstore.go

func (c *Client) do(ctx context.Context, req *http.Request, v interface{}) error {
	// Add the context to the request.
	req = req.WithContext(ctx)
	log.Printf("[DEBUG] go-petstore request: %v", req)
	
	// wake up the function?
	tempReq, _ := c.newRequest("GET","pets",nil)
	c.http.Do(tempReq)
		  
	// Execute the request and check the response.
	resp, err := c.http.Do(req)

[scottwinkler]

Hello Andreas,
thank you for reading my book. you have found some of the code i am less proud of. this was a hack i did to get the api to work on AWS lambda. See lambda has a cold start which can be a few seconds. During that time it has to first start up the gin server, and is therefore not able to process the request. Instead, it hangs for the full 30 seconds before returning nothing. What this does is make a request to "wake up" the lambda function, then the next request will surely succeed. Not great, but the best i was able to come up with. If you know of a better way, I would be happy to have your PR.

Regards,
Scott

[anpolychrono]

Hi Scott, That's great. I thought it was something related with GO net/http internals which I didn't get. This hack proves that it is always better to develop your own SDK client instead of an autogenerated one from swagger-tools or similar. I really enjoy your book, had a couple of projects in Terraform before a couple of years and started with the "Terraform Up and Running" which was the only available at the moment which helped a lot, with the "Terraform in Action" I understood a lot of the internals in Terraform, how to organize a project etc. But I believe developing your own custom provider gives a lot of satisfaction - especially to me because I am trying to learn Go at the same time. Thank you for the response and your time, AndreasPo

…

On Tue, Mar 15, 2022 at 5:37 PM Scott Winkler ***@***.***> wrote: Hello Andreas, thank you for reading my book. you have found some of the code i am less proud of. this was a hack i did to get the api to work on AWS lambda. See lambda has a cold start which can be a few seconds. During that time it has to first start up the gin server, and is therefore not able to process the request. Instead, it hangs for the full 30 seconds before returning nothing. What this does is make a request to "wake up" the lambda function, then the next request will surely succeed. Not great, but the best i was able to come up with. If you know of a better way, I would be happy to have your PR. Regards, Scott — Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAOAHHVQMZT7KMX2ZCLR4S3VACVFHANCNFSM5QYE4TPQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

-- *Polychronopoulos I. Andreas *

[scottwinkler]

Thank you for your kind words. I hope to write a version two of the book someday. If you have not already done so, I would appreciate if you could please leave a positive review, it really helps me out.

[anpolychrono]

I can't recall if I have already written a review, however I can't find out from the Manning site where I should click for a book review.

…

On Tue, Mar 15, 2022 at 8:40 PM Scott Winkler ***@***.***> wrote: Thank you for your kind words. I hope to write a version two of the book someday. If you have not already done so, I would appreciate if you could please leave a positive review, it really helps me out. — Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAOAHHWMSQS5KX3TB6N4IHLVADKSJANCNFSM5QYE4TPQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

-- *Polychronopoulos I. Andreas *