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Merge pull request #8003 from tinyspeck/am_vtadmin_experimental_table…
…tdebug [vtadmin] experimental tabletdebug
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| /* | ||
| Copyright 2021 The Vitess 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 experimental | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "text/template" | ||
|
|
||
| vtadminhttp "vitess.io/vitess/go/vt/vtadmin/http" | ||
|
|
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| vtadminpb "vitess.io/vitess/go/vt/proto/vtadmin" | ||
| ) | ||
|
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| // TabletDebugVarsPassthrough makes a passthrough request to a tablet's | ||
| // /debug/vars route, after looking up the tablet via VTAdmin's GetTablet | ||
| // rpc. | ||
| func TabletDebugVarsPassthrough(ctx context.Context, r vtadminhttp.Request, api *vtadminhttp.API) *vtadminhttp.JSONResponse { | ||
| vars := r.Vars() | ||
|
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| tablet, err := api.Server().GetTablet(ctx, &vtadminpb.GetTabletRequest{ | ||
| Hostname: vars["tablet"], | ||
| ClusterIds: r.URL.Query()["cluster"], | ||
| }) | ||
|
|
||
| if err != nil { | ||
| return vtadminhttp.NewJSONResponse(nil, err) | ||
| } | ||
|
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| debugVars, err := getDebugVars(ctx, api, tablet) | ||
| return vtadminhttp.NewJSONResponse(debugVars, err) | ||
| } | ||
|
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| func getDebugVars(ctx context.Context, api *vtadminhttp.API, tablet *vtadminpb.Tablet) (map[string]interface{}, error) { | ||
| tmpl, err := template.New("tablet-fqdn").Parse(api.Options().ExperimentalOptions.TabletFQDNTmpl) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| buf := bytes.NewBuffer(nil) | ||
| if err := tmpl.Execute(buf, tablet); err != nil { | ||
| return nil, err | ||
| } | ||
| _, _ = buf.WriteString("/debug/vars") | ||
|
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| url := buf.String() | ||
| req, err := http.NewRequestWithContext(ctx, "GET", url, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| resp, err := http.DefaultClient.Do(req) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| defer resp.Body.Close() | ||
|
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| data, err := ioutil.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| var debugVars map[string]interface{} | ||
| if err := json.Unmarshal(data, &debugVars); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return debugVars, nil | ||
| } |