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block.go
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block.go
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package cli
import (
"context"
"encoding/json"
"os"
"strconv"
"gopkg.in/yaml.v2"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/client/flags"
"github.com/spf13/cobra"
tmcli "github.com/tendermint/tendermint/libs/cli"
)
// BlockCommand returns the verified block data for a given heights
func BlockCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "block [height]",
Short: "Get verified data for a the block at given height",
Args: cobra.MaximumNArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
clientCtx, err := client.GetClientQueryContext(cmd)
if err != nil {
return err
}
var height *int64
// optional height
if len(args) > 0 {
h, err := strconv.Atoi(args[0])
if err != nil {
return err
}
if h > 0 {
tmp := int64(h)
height = &tmp
}
}
// get the node
node, err := clientCtx.GetNode()
if err != nil {
return err
}
// header -> BlockchainInfo
// header, tx -> Block
// results -> BlockResults
res, err := node.Block(context.Background(), height)
if err != nil {
return err
}
return PrintOutput(clientCtx, res)
},
}
cmd.Flags().StringP(tmcli.OutputFlag, "o", "json", "Output format (text|json)")
cmd.Flags().String(flags.FlagNode, "tcp://localhost:26657", "<host>:<port> to Tendermint RPC interface for this chain")
return cmd
}
func PrintOutput(ctx client.Context, any interface{}) error {
out, err := json.MarshalIndent(any, "", " ")
if err != nil {
return err
}
if ctx.OutputFormat == "text" {
// handle text format by decoding and re-encoding JSON as YAML
var j interface{}
err := json.Unmarshal(out, &j)
if err != nil {
return err
}
out, err = yaml.Marshal(j)
if err != nil {
return err
}
}
writer := ctx.Output
if writer == nil {
writer = os.Stdout
}
if _, err := writer.Write(out); err != nil {
return err
}
if ctx.OutputFormat != "text" {
// append new-line for formats besides YAML
_, err = writer.Write([]byte("\n"))
if err != nil {
return err
}
}
return nil
}