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http.go
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http.go
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package ring
import (
"context"
"fmt"
"html/template"
"math"
"net/http"
"sort"
"time"
"github.com/go-kit/kit/log/level"
"github.com/cortexproject/cortex/pkg/util"
)
const pageContent = `
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Cortex Ring Status</title>
</head>
<body>
<h1>Cortex Ring Status</h1>
<p>Current time: {{ .Now }}</p>
<form action="" method="POST">
<input type="hidden" name="csrf_token" value="$__CSRF_TOKEN_PLACEHOLDER__">
<table width="100%" border="1">
<thead>
<tr>
<th>Instance ID</th>
<th>Availability Zone</th>
<th>State</th>
<th>Address</th>
<th>Last Heartbeat</th>
<th>Tokens</th>
<th>Ownership</th>
<th>Actions</th>
</tr>
</thead>
<tbody>
{{ range $i, $ing := .Ingesters }}
{{ if mod $i 2 }}
<tr>
{{ else }}
<tr bgcolor="#BEBEBE">
{{ end }}
<td>{{ .ID }}</td>
<td>{{ .Zone }}</td>
<td>{{ .State }}</td>
<td>{{ .Address }}</td>
<td>{{ .Timestamp }}</td>
<td>{{ .NumTokens }}</td>
<td>{{ .Ownership }}%</td>
<td><button name="forget" value="{{ .ID }}" type="submit">Forget</button></td>
</tr>
{{ end }}
</tbody>
</table>
<br>
{{ if .ShowTokens }}
<input type="button" value="Hide Tokens" onclick="window.location.href = '?tokens=false' " />
{{ else }}
<input type="button" value="Show Tokens" onclick="window.location.href = '?tokens=true'" />
{{ end }}
{{ if .ShowTokens }}
{{ range $i, $ing := .Ingesters }}
<h2>Instance: {{ .ID }}</h2>
<p>
Tokens:<br />
{{ range $token := .Tokens }}
{{ $token }}
{{ end }}
</p>
{{ end }}
{{ end }}
</form>
</body>
</html>`
var pageTemplate *template.Template
func init() {
t := template.New("webpage")
t.Funcs(template.FuncMap{"mod": func(i, j int) bool { return i%j == 0 }})
pageTemplate = template.Must(t.Parse(pageContent))
}
func (r *Ring) forget(ctx context.Context, id string) error {
unregister := func(in interface{}) (out interface{}, retry bool, err error) {
if in == nil {
return nil, false, fmt.Errorf("found empty ring when trying to unregister")
}
ringDesc := in.(*Desc)
ringDesc.RemoveIngester(id)
return ringDesc, true, nil
}
return r.KVClient.CAS(ctx, r.key, unregister)
}
func (r *Ring) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if req.Method == http.MethodPost {
ingesterID := req.FormValue("forget")
if err := r.forget(req.Context(), ingesterID); err != nil {
level.Error(util.WithContext(req.Context(), util.Logger)).Log("msg", "error forgetting instance", "err", err)
}
// Implement PRG pattern to prevent double-POST and work with CSRF middleware.
// https://en.wikipedia.org/wiki/Post/Redirect/Get
// http.Redirect() would convert our relative URL to absolute, which is not what we want.
// Browser knows how to do that, and it also knows real URL. Furthermore it will also preserve tokens parameter.
// Note that relative Location URLs are explicitly allowed by specification, so we're not doing anything wrong here.
w.Header().Set("Location", "#")
w.WriteHeader(http.StatusFound)
return
}
r.mtx.RLock()
defer r.mtx.RUnlock()
ingesterIDs := []string{}
for id := range r.ringDesc.Ingesters {
ingesterIDs = append(ingesterIDs, id)
}
sort.Strings(ingesterIDs)
ingesters := []interface{}{}
_, owned := countTokens(r.ringDesc, r.ringTokens)
for _, id := range ingesterIDs {
ing := r.ringDesc.Ingesters[id]
timestamp := time.Unix(ing.Timestamp, 0)
state := ing.State.String()
if !r.IsHealthy(&ing, Reporting) {
state = unhealthy
}
ingesters = append(ingesters, struct {
ID string `json:"id"`
State string `json:"state"`
Address string `json:"address"`
Timestamp string `json:"timestamp"`
Zone string `json:"zone"`
Tokens []uint32 `json:"tokens"`
NumTokens int `json:"-"`
Ownership float64 `json:"-"`
}{
ID: id,
State: state,
Address: ing.Addr,
Timestamp: timestamp.String(),
Tokens: ing.Tokens,
Zone: ing.Zone,
NumTokens: len(ing.Tokens),
Ownership: (float64(owned[id]) / float64(math.MaxUint32)) * 100,
})
}
tokensParam := req.URL.Query().Get("tokens")
util.RenderHTTPResponse(w, struct {
Ingesters []interface{} `json:"shards"`
Now time.Time `json:"now"`
ShowTokens bool `json:"-"`
}{
Ingesters: ingesters,
Now: time.Now(),
ShowTokens: tokensParam == "true",
}, pageTemplate, req)
}