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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"encoding/json"
"fmt"
"io"
"net/http"
"reflect"
"strconv"
)
type promMetricFetcher struct {
promHost string
}
type promValueResult struct {
timestamp float64
value float64
}
func makePromMetricFetcher(host string) *promMetricFetcher {
return &promMetricFetcher{
promHost: host,
}
}
func (r *promMetricFetcher) getMetric(query string) (results []promValueResult, err error) {
queryURL := fmt.Sprintf("http://%s:9090/api/v1/query", r.promHost)
req, err := http.NewRequest("GET", queryURL, nil)
if err != nil {
return
}
q := req.URL.Query()
q.Add("query", query)
req.URL.RawQuery = q.Encode()
httpClient := http.Client{}
resp, err := httpClient.Do(req /*req.WithContext(ctx)*/)
if err != nil {
return
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("http error code received %v", resp.StatusCode)
}
bytes, err := io.ReadAll(resp.Body)
if err != nil {
return
}
var resultsMap map[string]interface{}
pathMap := make(map[string]interface{})
err = json.Unmarshal(bytes, &resultsMap)
if err != nil {
return
}
r.parseMap("", resultsMap, pathMap)
for i := 0; ; i++ {
// ensure that we have /data/result[X]/value[0] and /data/result[X]/value[1]
tsName := fmt.Sprintf("/data/result[%d]/value[0]", i)
valName := fmt.Sprintf("/data/result[%d]/value[1]", i)
_, hasTs := pathMap[tsName]
_, hasVal := pathMap[valName]
if !hasTs || !hasVal {
break
}
var tsFloat, valFloat float64
if flt, ok := pathMap[tsName].(float64); !ok {
break
} else {
tsFloat = flt
}
switch concreteVal := pathMap[valName].(type) {
case float64:
valFloat = concreteVal
case uint64:
valFloat = float64(concreteVal)
case int64:
valFloat = float64(concreteVal)
case string:
valFloat, _ = strconv.ParseFloat(concreteVal, 64)
default:
fmt.Printf("failed : %v %v\n", pathMap[valName], reflect.TypeOf(pathMap[valName]))
return
}
results = append(results, promValueResult{
timestamp: tsFloat,
value: valFloat,
})
}
return results, nil
}
func (r *promMetricFetcher) parseMap(path string, aMap map[string]interface{}, pathMap map[string]interface{}) {
for key, val := range aMap {
switch concreteVal := val.(type) {
case map[string]interface{}:
r.parseMap(path+"/"+key, val.(map[string]interface{}), pathMap)
case []interface{}:
r.parseArray(path+"/"+key, val.([]interface{}), pathMap)
default:
//fmt.Println(path+"/"+key, ":", concreteVal)
pathMap[path+"/"+key] = concreteVal
}
}
}
func (r *promMetricFetcher) parseArray(path string, anArray []interface{}, pathMap map[string]interface{}) {
for i, val := range anArray {
switch concreteVal := val.(type) {
case map[string]interface{}:
r.parseMap(fmt.Sprintf("%s[%d]", path, i), val.(map[string]interface{}), pathMap)
case []interface{}:
r.parseArray(fmt.Sprintf("%s[%d]", path, i), val.([]interface{}), pathMap)
default:
//fmt.Println(fmt.Sprintf("%s[%d]", path, i), concreteVal)
pathMap[fmt.Sprintf("%s[%d]", path, i)] = concreteVal
}
}
}
func (r *promMetricFetcher) getSingleValue(results []promValueResult) (result float64, err error) {
if len(results) > 1 {
return 0.0, fmt.Errorf("unexpected number of results %v", results)
}
if len(results) == 0 {
return 0.0, nil
}
return results[0].value, nil
}
//curl http://telemetry.algodev.network:9090/api/v1/query\?query\=max\(algod_ledger_round\)
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