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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 (
"bufio"
"fmt"
"io"
"os"
)
type roundPoller struct {
telemetryHost string
}
func readHostFile(telemetryHostFile string) (bytes []byte, err error) {
file, err := os.Open(telemetryHostFile)
if err != nil {
return nil, err
}
defer file.Close()
reader := bufio.NewReader(file)
line, _, _ := reader.ReadLine()
if err == io.EOF {
return []byte(line), nil
}
if err != io.EOF && err != nil {
return nil, err
}
return []byte(line), nil
}
func makeRoundPoller(telemetryHostFile string) *roundPoller {
if telemetryHostFile == "" {
return nil
}
hostNameBytes, err := readHostFile(telemetryHostFile)
if err != nil {
fmt.Printf("Failed to read '%s' : %v\n", telemetryHostFile, err)
return nil
}
return &roundPoller{
telemetryHost: string(hostNameBytes),
}
}
func (r *roundPoller) getRound() (round uint64, err error) {
fetcher := makePromMetricFetcher(r.telemetryHost)
results, err := fetcher.getMetric("max(algod_ledger_round)")
if err != nil {
return 0, err
}
result, err := fetcher.getSingleValue(results)
if err != nil {
return 0, err
}
val := uint64(result)
return val, nil
}
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