[ffresty] [metric] HTTP Response Time and Complete Gauge Support #160
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@@ -4,4 +4,6 @@ coverage.txt | |
| **/debug.test | ||
| .DS_Store | ||
| __debug* | ||
| .vscode/*.log | ||
| *.iml | ||
| .idea/ | ||
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@@ -40,7 +40,14 @@ | |
| "golang.org/x/time/rate" | ||
| ) | ||
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| const ( | ||
| metricsHTTPResponsesTotal = "http_responses_total" | ||
| metricsNetworkErrorsTotal = "network_errors_total" | ||
| metricsHTTPResponseTime = "http_response_time_seconds" | ||
| ) | ||
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| type retryCtxKey struct{} | ||
| type hostCtxKey struct{} | ||
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| type retryCtx struct { | ||
| id string | ||
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@@ -98,27 +105,21 @@ | |
| if err != nil { | ||
| return err | ||
| } | ||
| metricsManager.NewCounterMetricWithLabels(ctx, metricsHTTPResponsesTotal, "HTTP response", []string{"status", "error", "host", "method"}, false) | ||
| metricsManager.NewCounterMetricWithLabels(ctx, metricsNetworkErrorsTotal, "Network error", []string{"host", "method"}, false) | ||
| metricsManager.NewSummaryMetricWithLabels(ctx, metricsHTTPResponseTime, "HTTP response time", []string{"status", "host", "method"}, false) | ||
|
There was a problem hiding this comment. @onelapahead what's your consideration between There was a problem hiding this comment. Histogram is more costly in terms of cardinality bc of all the buckets you make. So this felt light enough to only calculate average response time across a few basic dimensions. Would love to toggle btwn histogram and summaries based on certain settings eventually, but that was a bigger change than I had an appetite for. |
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| } | ||
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| // create hooks | ||
| onErrorMetricsHook := func(req *resty.Request, _ error) { | ||
| // whilst there it is a possibility to get an response returned in the error here (and resty doc for OnError shows this) it seems to be a special case and the statuscode in such cases was not set. | ||
| // therefore we log all cases as network_error we may in future find reason to extract more detail from the error | ||
| metricsManager.IncCounterMetricWithLabels(ctx, metricsNetworkErrorsTotal, map[string]string{"host": req.Context().Value(hostCtxKey{}).(string), "method": req.Method}, nil) | ||
| } | ||
| RegisterGlobalOnError(onErrorMetricsHook) | ||
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| onSuccessMetricsHook := func(_ *resty.Client, resp *resty.Response) { | ||
| metricsManager.IncCounterMetricWithLabels(ctx, metricsHTTPResponsesTotal, map[string]string{"status": fmt.Sprintf("%d", resp.RawResponse.StatusCode), "error": "false", "host": resp.Request.Context().Value(hostCtxKey{}).(string), "method": resp.Request.Method}, nil) | ||
| } | ||
| RegisterGlobalOnSuccess(onSuccessMetricsHook) | ||
| return nil | ||
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@@ -142,13 +143,17 @@ | |
| } | ||
| rCtx := resp.Request.Context() | ||
| rc := rCtx.Value(retryCtxKey{}).(*retryCtx) | ||
| elapsed := time.Since(rc.start) | ||
| level := logrus.DebugLevel | ||
| status := resp.StatusCode() | ||
| if status >= 300 { | ||
| level = logrus.ErrorLevel | ||
| } | ||
| log.L(rCtx).Logf(level, "<== %s %s [%d] (%dms)", resp.Request.Method, resp.Request.URL, status, time.Since(rc.start).Milliseconds()) | ||
| if metricsManager != nil { | ||
| metricsManager.ObserveSummaryMetricWithLabels(rCtx, metricsHTTPResponseTime, elapsed.Seconds(), map[string]string{"status": fmt.Sprintf("%d", status), "host": rCtx.Value(hostCtxKey{}).(string), "method": resp.Request.Method}, nil) | ||
| } | ||
| // TODO use req.TraceInfo() for richer metrics at the DNS and transport layer | ||
| } | ||
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| func OnError(req *resty.Request, err error) { | ||
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@@ -193,7 +198,7 @@ | |
| // | ||
| // You can use the normal Resty builder pattern, to set per-instance configuration | ||
| // as required. | ||
| func NewWithConfig(ctx context.Context, ffrestyConfig Config) (client *resty.Client) { | ||
| if ffrestyConfig.HTTPCustomClient != nil { | ||
| if httpClient, ok := ffrestyConfig.HTTPCustomClient.(*http.Client); ok { | ||
| client = resty.NewWithClient(httpClient) | ||
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@@ -232,10 +237,10 @@ | |
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| rateLimiterMap[client] = GetRateLimiter(ffrestyConfig.ThrottleRequestsPerSecond, ffrestyConfig.ThrottleBurst) | ||
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| _url := strings.TrimSuffix(ffrestyConfig.URL, "/") | ||
| if _url != "" { | ||
| client.SetBaseURL(_url) | ||
| log.L(ctx).Debugf("Created REST client to %s", _url) | ||
| } | ||
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| if ffrestyConfig.ProxyURL != "" { | ||
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@@ -244,7 +249,7 @@ | |
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| client.SetTimeout(time.Duration(ffrestyConfig.HTTPRequestTimeout)) | ||
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| client.OnBeforeRequest(func(c *resty.Client, req *resty.Request) error { | ||
| if rateLimiterMap[client] != nil { | ||
| // Wait for permission to proceed with the request | ||
| err := rateLimiterMap[client].Wait(req.Context()) | ||
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@@ -253,6 +258,26 @@ | |
| } | ||
| } | ||
| rCtx := req.Context() | ||
| // Record host in context to avoid redundant parses in hooks | ||
| var u *url.URL | ||
| if req.URL != "" { | ||
| u, _ = url.Parse(req.URL) | ||
| } | ||
| // The req.URL might have only set a path i.e. /home, fallbacking to the base URL of the client. | ||
| // So if the URL is nil, that's likely the case and we'll derive the host from the configured | ||
| // based instead. | ||
| if u == nil && _url != "" { | ||
| u, _ = url.Parse(_url) | ||
| } | ||
| if u == nil && c.BaseURL != "" { | ||
| u, _ = url.Parse(c.BaseURL) | ||
| } | ||
| if u != nil && u.Host != "" { | ||
| host := u.Host | ||
| rCtx = context.WithValue(rCtx, hostCtxKey{}, host) | ||
| } else { | ||
| rCtx = context.WithValue(rCtx, hostCtxKey{}, "unknown") | ||
| } | ||
| rc := rCtx.Value(retryCtxKey{}) | ||
| if rc == nil { | ||
| // First attempt | ||
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@@ -289,8 +314,9 @@ | |
| } | ||
| } | ||
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| log.L(rCtx).Debugf("==> %s %s%s", req.Method, _url, req.URL) | ||
| log.L(rCtx).Tracef("==> (body) %+v", req.Body) | ||
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| return nil | ||
| }) | ||
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Some size metrics for data transmitted would be useful to add as well.