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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -49,3 +49,5 @@ modules: | |
| timeout: 5s | ||
| icmp: | ||
| ttl: 5 | ||
| websocket: | ||
| prober: websocket | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| // Copyright 2016 The Prometheus Authors | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package prober | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/tls" | ||
| "net/http" | ||
| "net/url" | ||
|
|
||
| "github.com/go-kit/log" | ||
| "github.com/go-kit/log/level" | ||
| "github.com/gorilla/websocket" | ||
| "github.com/prometheus/blackbox_exporter/config" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "golang.org/x/text/cases" | ||
| "golang.org/x/text/language" | ||
| ) | ||
|
|
||
| func ProbeWebsocket(ctx context.Context, target string, module config.Module, registry *prometheus.Registry, logger log.Logger) (success bool) { | ||
|
|
||
| targetURL, err := url.Parse(target) | ||
| if err != nil { | ||
| logger.Log("msg", "Could not parse target URL", "err", err) | ||
| return false | ||
| } | ||
|
|
||
| level.Debug(logger).Log("msg", "probing websocket", "target", targetURL.String()) | ||
|
|
||
| httpStatusCode := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "probe_http_status_code", | ||
| Help: "Response HTTP status code", | ||
| }) | ||
| isConnected := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "probe_is_upgraded", | ||
| Help: "Indicates if the websocket connection was successfully upgraded", | ||
| }) | ||
|
|
||
| registry.MustRegister(isConnected) | ||
| registry.MustRegister(httpStatusCode) | ||
|
|
||
| dialer := websocket.Dialer{ | ||
| TLSClientConfig: &tls.Config{ | ||
| InsecureSkipVerify: module.Websocket.HTTPClientConfig.InsecureSkipVerify, | ||
| }, | ||
| } | ||
|
|
||
| connection, resp, err := dialer.DialContext(ctx, targetURL.String(), constructHeadersFromConfig(module.Websocket.HTTPClientConfig, logger)) | ||
| if resp != nil { | ||
| httpStatusCode.Set(float64(resp.StatusCode)) | ||
| } | ||
| if err != nil { | ||
| logger.Log("msg", "Error dialing websocket", "err", err) | ||
| return false | ||
| } | ||
| defer connection.Close() | ||
|
|
||
| isConnected.Set(1) | ||
|
|
||
| if len(module.Websocket.QueryResponse) > 0 { | ||
| probeFailedDueToRegex := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "probe_failed_due_to_regex", | ||
| Help: "Indicates if probe failed due to regex", | ||
| }) | ||
| registry.MustRegister(probeFailedDueToRegex) | ||
|
|
||
| queryMatched := true | ||
| for _, qr := range module.Websocket.QueryResponse { | ||
| send := qr.Send | ||
|
|
||
| if qr.Expect.Regexp != nil { | ||
| var match []int | ||
| _, message, err := connection.ReadMessage() | ||
| if err != nil { | ||
| logger.Log("msg", "Error reading message", "err", err) | ||
| queryMatched = false | ||
| break | ||
| } | ||
| match = qr.Expect.Regexp.FindSubmatchIndex(message) | ||
| if match != nil { | ||
| level.Debug(logger).Log("msg", "regexp matched", "regexp", qr.Expect.Regexp, "line", message) | ||
| } else { | ||
| level.Error(logger).Log("msg", "Regexp did not match", "regexp", qr.Expect.Regexp, "line", message) | ||
| queryMatched = false | ||
| break | ||
| } | ||
| send = string(qr.Expect.Regexp.Expand(nil, []byte(send), message, match)) | ||
| } | ||
|
|
||
| if send != "" { | ||
| err = connection.WriteMessage(websocket.TextMessage, []byte(send)) | ||
| if err != nil { | ||
| queryMatched = false | ||
| logger.Log("msg", "Error sending message", "err", err) | ||
| break | ||
| } | ||
| level.Debug(logger).Log("msg", "message sent", "message", send) | ||
| } | ||
| } | ||
| if queryMatched { | ||
| probeFailedDueToRegex.Set(0) | ||
| } else { | ||
| probeFailedDueToRegex.Set(1) | ||
| } | ||
| } | ||
|
|
||
| return true | ||
| } | ||
|
|
||
| func constructHeadersFromConfig(config config.HTTPClientConfig, logger log.Logger) map[string][]string { | ||
| headers := http.Header{} | ||
| if config.BasicAuth.Username != "" || config.BasicAuth.Password != "" { | ||
| headers.Add("Authorization", config.BasicAuth.BasicAuthHeader()) | ||
| } else if config.BearerToken != "" { | ||
| headers.Add("Authorization", "Bearer "+config.BearerToken) | ||
| } | ||
| for key, value := range config.HTTPHeaders { | ||
| if _, ok := value.(string); ok { | ||
| headers.Add(key, value.(string)) | ||
| } else if _, ok := value.([]string); ok { | ||
| headers[cases.Title(language.English).String(key)] = append(headers[key], value.([]string)...) | ||
| } | ||
| } | ||
|
|
||
| level.Debug(logger).Log("msg", "Constructed headers", "headers", headers) | ||
| return headers | ||
| } |
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