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Merge pull request #115 from kitfoman/add-external-probes
Extend DNS resolver to include TCP and HTTP checks for external targets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| // Copyright 2018 Bloomberg Finance L.P. | ||
| // | ||
| // 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 goldpinger | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/tls" | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "net/url" | ||
| "time" | ||
| ) | ||
|
|
||
| func doDNSProbe(addr string, timeout time.Duration) error { | ||
| resolver := net.Resolver{} | ||
| ctx, cancel := context.WithTimeout(context.Background(), timeout) | ||
| defer cancel() | ||
| ips, err := resolver.LookupHost(ctx, addr) | ||
| if len(ips) == 0 { | ||
| return fmt.Errorf("%s was resolved to 0 ips", addr) | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| func doTCPProbe(addr string, timeout time.Duration) error { | ||
| conn, err := net.DialTimeout("tcp", addr, timeout) | ||
| if conn != nil { | ||
| defer conn.Close() | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| func doHTTPProbe(addr string, timeout time.Duration) error { | ||
| client := http.Client{Timeout: timeout} | ||
| u, err := url.Parse(addr) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if u.Scheme != "http" && u.Scheme != "https" { | ||
| return fmt.Errorf("invalid url scheme: '%s' in address", u.Scheme) | ||
| } | ||
| if u.Scheme == "https" { | ||
| client.Transport = &http.Transport{ | ||
| TLSClientConfig: &tls.Config{ | ||
| InsecureSkipVerify: true, | ||
| }, | ||
| } | ||
| } | ||
| resp, err := client.Get(addr) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| defer resp.Body.Close() | ||
| if resp.StatusCode != 200 { | ||
| return fmt.Errorf("%s returned non-200 resp: %d", addr, resp.StatusCode) | ||
| } | ||
| return err | ||
| } |
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