Edge service retries

[BrooksCunningham]

The intention of this PR is to make the function CreateOrUpdateEdgeDeploymentService() more resilient by adding a limited number of retries. This way if the edge service is not ready yet, requests will continue to be made until successful or the maximum number of statically defined number of retries is exceeded.

The function doRequestDetailed() was also added to provide access to the entire response object, which includes the response status, headers, and body. The response status is useful to various case switches to break out of the retry logic.

I have done 2 tests which both involve attempting to create and link and NGWAF edge service to a VCL service.

package main

import (
	"log"
	"os"
	"time"

	sigsci "github.com/signalsciences/go-sigsci"
)

func main() {
	corp := os.Getenv("NGWAF_CORP")
	site := os.Getenv("NGWAF_SITE")
	email := os.Getenv("NGWAF_EMAIL")
	token := os.Getenv("NGWAF_TOKEN")

	fastly_sid := "" //your sid here
	fastly_api_key := os.Getenv("FASTLY_API_KEY")
	ActivateVersion := true
	PercentEnabled := 100

	const sleep_time = 2 * time.Second

	sc := sigsci.NewTokenClient(email, token)

	sc.SetFastlyKey(fastly_api_key)

	log.Println("Creating edge deployment with updated API")

	log.Println(sc.CreateOrUpdateEdgeDeployment(corp, site))

	CreateOrUpdateEdgeDeploymentServiceBody := sigsci.CreateOrUpdateEdgeDeploymentServiceBody{
		ActivateVersion: &ActivateVersion,
		PercentEnabled:  PercentEnabled,
	}
	log.Println(sc.CreateOrUpdateEdgeDeploymentService(corp, site, fastly_sid, CreateOrUpdateEdgeDeploymentServiceBody))

}

1. For the first test, which was designed to fail, I tried calling on a SID that did not exist by leaving fastly_sid blank. Below is that result.

2023/06/26 12:58:59 Creating edge deployment with updated API
2023/06/26 12:59:41 <nil>
2023/06/26 13:08:07 <nil>

No modificaitons were made to the VCL as expected.

2. For my second test, I create a VCL service and used a valid Fastly SID in the above script. Below is that output.

2023/06/26 13:10:15 Creating edge deployment with updated API
2023/06/26 13:11:10 <nil>
2023/06/26 13:11:39 <nil>

The expected modificaitons were made to the VCL with the edge inspector linked.

Please let me know if there are other tests that would provide better coverage.

[BrooksCunningham]

@mattg-sigsci @shawnps Please let me know what I can do to help move this PR forward. Thank you for the help on this.

[mattg-sigsci]

Approved pending resolution of the conversation in Slack.