Created
July 21, 2022 15:27
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get drand round number and timestamp in CSV format
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package main | |
import ( | |
"context" | |
"encoding/csv" | |
"encoding/hex" | |
"fmt" | |
"os" | |
"strconv" | |
"time" | |
"github.com/drand/drand/chain" | |
"github.com/drand/drand/client/http" | |
) | |
func main() { | |
chainHash := "8990e7a9aaed2ffed73dbd7092123d6f289930540d7651336225dc172e51b2ce" | |
hash, err := hex.DecodeString(chainHash) | |
if err != nil { | |
panic(fmt.Errorf("decoding chain hash: %w", err)) | |
} | |
client, err := http.New("https://api.drand.sh/", hash, nil) | |
if err != nil { | |
panic(err) | |
} | |
info, err := client.Info(context.Background()) | |
if err != nil { | |
panic(err) | |
} | |
records := []string{"round", "ts"} | |
currentRound := chain.CurrentRound(time.Now().Unix(), info.Period, info.GenesisTime) | |
w := csv.NewWriter(os.Stdout) | |
w.Write(records) | |
for n := 0; n < 10; n++ { | |
round := currentRound - uint64(n) | |
roundTime := chain.TimeOfRound(info.Period, info.GenesisTime, round) | |
records = []string{strconv.Itoa(int(round)), strconv.Itoa(int(roundTime))} | |
if err := w.Write(records); err != nil { | |
panic(err) | |
} | |
} | |
w.Flush() | |
if err := w.Error(); err != nil { | |
panic(err) | |
} | |
} |
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