Created
March 5, 2019 12:31
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Example of using Tendermint HTTP client to subscribe for new block headers
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package main | |
import ( | |
"context" | |
"os" | |
"os/signal" | |
"syscall" | |
"github.com/tendermint/tendermint/libs/log" | |
tmclient "github.com/tendermint/tendermint/rpc/client" | |
tmtypes "github.com/tendermint/tendermint/types" | |
) | |
func main() { | |
logger := log.NewTMLogger(log.NewSyncWriter(os.Stdout)) | |
client := tmclient.NewHTTP("tcp://localhost:26657", "/websocket") | |
client.SetLogger(logger) | |
err := client.Start() | |
if err != nil { | |
logger.Error("Failed to start a client", "err", err) | |
os.Exit(1) | |
} | |
defer client.Stop() | |
query := "tm.event = 'NewBlockHeader'" | |
out, err := client.Subscribe(context.Background(), "test", query) | |
if err != nil { | |
logger.Error("Failed to subscribe to query", "err", err, "query", query) | |
os.Exit(1) | |
} | |
quit := make(chan os.Signal, 1) | |
signal.Notify(quit, os.Interrupt, syscall.SIGTERM) | |
for { | |
select { | |
case result := <-out: | |
logger.Info("got new block header", | |
"height", result.Data.(tmtypes.EventDataNewBlockHeader).Header.Height) | |
case <-quit: | |
os.Exit(0) | |
} | |
} | |
} |
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