resourceidprocessor

resourceidprocessor.cs

       public class ResourceIdProcessor : ActivityProcessor
        {
            private  readonly AsyncLocal<string> resourceId = new AsyncLocal<string>();
            private readonly IHttpContextAccessor httpContextAccessor;

            public ResourceIdProcessor(IHttpContextAccessor httpContextAccessor)
            {
                resourceId = null;
            }

            public override void OnStart(Activity activity)
            {
                if (this.resourceId.Value != null)
                {
                    activity.AddTag("resourceId", this.resourceId.Value);
                }
                else
                {
                    activity.AddTag("resourceId", this.GetResourceId());
                }
            }

            public string GetResourceId()
            {
                var ctx = this.httpContextAccessor.HttpContext;
                if (ctx == null)
                {
                    return string.Empty;
                }

                return this.GetResourceId(ctx);
            }

            private string GetResourceId(HttpContext context)
            {
                // HttpContext.Current on ASP.NET classic

                // use HttpContext to calculate resource id
                // this code runs before any middleware, no way to get any callback before that
                return "/SUBSCRIPTIONS/123/RESOURCEGROUPS/MY-RG/PROVIDERS/MICROSOFT.NAMESPACE/TYPE/MY-RESOURCE";
            }
        }