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ring: Use static types for ingester descriptions in HTTP responses #78

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Nov 26, 2021
Merged

ring: Use static types for ingester descriptions in HTTP responses #78

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42 changes: 23 additions & 19 deletions ring/http.go
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Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,24 @@ func (r *Ring) forget(ctx context.Context, id string) error {
return r.KVClient.CAS(ctx, r.key, unregister)
}

type ingesterDesc struct {
ID string `json:"id"`
State string `json:"state"`
Address string `json:"address"`
HeartbeatTimestamp string `json:"timestamp"`
RegisteredTimestamp string `json:"registered_timestamp"`
Zone string `json:"zone"`
Tokens []uint32 `json:"tokens"`
NumTokens int `json:"-"`
Ownership float64 `json:"-"`
}

type httpResponse struct {
Ingesters []ingesterDesc `json:"shards"`
Now time.Time `json:"now"`
ShowTokens bool `json:"-"`
}

func (r *Ring) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if req.Method == http.MethodPost {
ingesterID := req.FormValue("forget")
Expand Down Expand Up @@ -132,7 +150,7 @@ func (r *Ring) ServeHTTP(w http.ResponseWriter, req *http.Request) {
sort.Strings(ingesterIDs)

now := time.Now()
ingesters := []interface{}{}
var ingesters []ingesterDesc
_, owned := r.countTokens()
for _, id := range ingesterIDs {
ing := r.ringDesc.Ingesters[id]
Expand All @@ -148,17 +166,7 @@ func (r *Ring) ServeHTTP(w http.ResponseWriter, req *http.Request) {
registeredTimestamp = ing.GetRegisteredAt().String()
}

ingesters = append(ingesters, struct {
ID string `json:"id"`
State string `json:"state"`
Address string `json:"address"`
HeartbeatTimestamp string `json:"timestamp"`
RegisteredTimestamp string `json:"registered_timestamp"`
Zone string `json:"zone"`
Tokens []uint32 `json:"tokens"`
NumTokens int `json:"-"`
Ownership float64 `json:"-"`
}{
ingesters = append(ingesters, ingesterDesc{
ID: id,
State: state,
Address: ing.Addr,
Expand All @@ -173,11 +181,7 @@ func (r *Ring) ServeHTTP(w http.ResponseWriter, req *http.Request) {

tokensParam := req.URL.Query().Get("tokens")

renderHTTPResponse(w, struct {
Ingesters []interface{} `json:"shards"`
Now time.Time `json:"now"`
ShowTokens bool `json:"-"`
}{
renderHTTPResponse(w, httpResponse{
Ingesters: ingesters,
Now: now,
ShowTokens: tokensParam == "true",
Expand All @@ -186,7 +190,7 @@ func (r *Ring) ServeHTTP(w http.ResponseWriter, req *http.Request) {

// RenderHTTPResponse either responds with json or a rendered html page using the passed in template
// by checking the Accepts header
func renderHTTPResponse(w http.ResponseWriter, v interface{}, t *template.Template, r *http.Request) {
func renderHTTPResponse(w http.ResponseWriter, v httpResponse, t *template.Template, r *http.Request) {
accept := r.Header.Get("Accept")
if strings.Contains(accept, "application/json") {
writeJSONResponse(w, v)
Expand All @@ -200,7 +204,7 @@ func renderHTTPResponse(w http.ResponseWriter, v interface{}, t *template.Templa
}

// WriteJSONResponse writes some JSON as a HTTP response.
func writeJSONResponse(w http.ResponseWriter, v interface{}) {
func writeJSONResponse(w http.ResponseWriter, v httpResponse) {
w.Header().Set("Content-Type", "application/json")

data, err := json.Marshal(v)
Expand Down