Add Continuation Token Support For Releases (#113)

* Added temp list for response values

* Generate continuation token url from header value

* Cycle through continuation tokens until none received

* Add counter variable to metric

* Unmarshal into  first time round

* Tidy up

* Remove counter

* Remove list len print cmd

* Removed extra length output

* Fixed casing on Dockerfile `as` statements

---------

Co-authored-by: Charlie B <[email protected]>

Author: cbat98

Dockerfile

@@ -1,7 +1,7 @@
 #############################################
 # Build
 #############################################
-FROM --platform=$BUILDPLATFORM golang:1.23-alpine as build
+FROM --platform=$BUILDPLATFORM golang:1.23-alpine AS build
 
 RUN apk upgrade --no-cache --force
 RUN apk add --update build-base make git
@@ -21,7 +21,7 @@ RUN GOOS=${TARGETOS} GOARCH=${TARGETARCH} make build
 #############################################
 # Test
 #############################################
-FROM gcr.io/distroless/static as test
+FROM gcr.io/distroless/static AS test
 USER 0:0
 WORKDIR /app
 COPY --from=build /go/src/github.com/webdevops/azure-devops-exporter/azure-devops-exporter .
@@ -30,7 +30,7 @@ RUN ["./azure-devops-exporter", "--help"]
 #############################################
 # Final-static
 #############################################
-FROM gcr.io/distroless/static as final-static
+FROM gcr.io/distroless/static AS final-static
 ENV LOG_JSON=1
 WORKDIR /
 COPY --from=test /app .

azure-devops-client/release.go

@@ -185,6 +185,7 @@ func (c *AzureDevopsClient) ListReleaseHistory(project string, minTime time.Time
 		url.QueryEscape(minTime.Format(time.RFC3339)),
 		url.QueryEscape(int64ToString(c.LimitReleasesPerProject)),
 	)
+
 	response, err := c.restVsrm().R().Get(url)
 	if err := c.checkResponse(response, err); err != nil {
 		error = err
@@ -197,5 +198,33 @@ func (c *AzureDevopsClient) ListReleaseHistory(project string, minTime time.Time
 		return
 	}
 
+	continuationToken := response.Header().Get("x-ms-continuationtoken")
+
+	for continuationToken != "" {
+		continuationUrl := fmt.Sprintf(
+			"%v&continuationToken=%v",
+			url,
+			continuationToken,
+		)
+
+		response, err = c.restVsrm().R().Get(continuationUrl)
+		if err := c.checkResponse(response, err); err != nil {
+			error = err
+			return
+		}
+
+		var tmpList ReleaseList
+		err = json.Unmarshal(response.Body(), &tmpList)
+		if err != nil {
+			error = err
+			return
+		}
+
+		list.Count += tmpList.Count
+		list.List = append(list.List, tmpList.List...)
+
+		continuationToken = response.Header().Get("x-ms-continuationtoken")
+	}
+
 	return
 }