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36a1fdca6c
This allows consistently using errors.Is() for verifying whether the given error wraps some other known error.
87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
package graphite
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import (
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// embed functions.json file
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_ "embed"
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/httputils"
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)
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// FunctionsHandler implements /functions handler.
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//
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// See https://graphite.readthedocs.io/en/latest/functions.html#function-api
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func FunctionsHandler(w http.ResponseWriter, r *http.Request) error {
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grouped := httputils.GetBool(r, "grouped")
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group := r.FormValue("group")
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result := make(map[string]interface{})
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for funcName, fi := range funcs {
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if group != "" && fi.Group != group {
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continue
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}
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if grouped {
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v := result[fi.Group]
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if v == nil {
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v = make(map[string]*funcInfo)
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result[fi.Group] = v
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}
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m := v.(map[string]*funcInfo)
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m[funcName] = fi
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} else {
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result[funcName] = fi
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}
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}
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return writeJSON(result, w, r)
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}
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// FunctionDetailsHandler implements /functions/<func_name> handler.
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//
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// See https://graphite.readthedocs.io/en/latest/functions.html#function-api
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func FunctionDetailsHandler(funcName string, w http.ResponseWriter, r *http.Request) error {
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result := funcs[funcName]
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if result == nil {
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return fmt.Errorf("cannot find function %q", funcName)
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}
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return writeJSON(result, w, r)
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}
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func writeJSON(result interface{}, w http.ResponseWriter, r *http.Request) error {
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data, err := json.Marshal(result)
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if err != nil {
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return fmt.Errorf("cannot marshal response to JSON: %w", err)
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}
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jsonp := r.FormValue("jsonp")
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contentType := getContentType(jsonp)
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w.Header().Set("Content-Type", contentType)
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if jsonp != "" {
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fmt.Fprintf(w, "%s(", jsonp)
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}
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w.Write(data)
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if jsonp != "" {
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fmt.Fprintf(w, ")")
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}
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return nil
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}
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//go:embed functions.json
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var funcsJSON []byte
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type funcInfo struct {
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Name string `json:"name"`
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Function string `json:"function"`
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Description string `json:"description"`
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Module string `json:"module"`
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Group string `json:"group"`
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Params json.RawMessage `json:"params"`
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}
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var funcs = func() map[string]*funcInfo {
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var m map[string]*funcInfo
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if err := json.Unmarshal(funcsJSON, &m); err != nil {
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// Do not use logger.Panicf, since it isn't ready yet.
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panic(fmt.Errorf("cannot parse funcsJSON: %w", err))
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}
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return m
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}()
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