133 lines
3.0 KiB
Go
133 lines
3.0 KiB
Go
package rpc
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import (
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"context"
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"fmt"
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"net/http"
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"strconv"
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"github.com/gorilla/mux"
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"github.com/spf13/cobra"
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"github.com/cosmos/cosmos-sdk/client"
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"github.com/cosmos/cosmos-sdk/client/flags"
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"github.com/cosmos/cosmos-sdk/codec/legacy"
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"github.com/cosmos/cosmos-sdk/types/rest"
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)
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//BlockCommand returns the verified block data for a given heights
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func BlockCommand() *cobra.Command {
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cmd := &cobra.Command{
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Use: "block [height]",
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Short: "Get verified data for a the block at given height",
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Args: cobra.MaximumNArgs(1),
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RunE: func(cmd *cobra.Command, args []string) error {
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clientCtx := client.GetClientContextFromCmd(cmd)
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var height *int64
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// optional height
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if len(args) > 0 {
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h, err := strconv.Atoi(args[0])
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if err != nil {
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return err
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}
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if h > 0 {
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tmp := int64(h)
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height = &tmp
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}
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}
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output, err := getBlock(clientCtx, height)
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if err != nil {
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return err
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}
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fmt.Println(string(output))
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return nil
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},
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}
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cmd.Flags().StringP(flags.FlagNode, "n", "tcp://localhost:26657", "Node to connect to")
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return cmd
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}
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func getBlock(clientCtx client.Context, height *int64) ([]byte, error) {
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// get the node
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node, err := clientCtx.GetNode()
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if err != nil {
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return nil, err
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}
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// header -> BlockchainInfo
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// header, tx -> Block
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// results -> BlockResults
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res, err := node.Block(context.Background(), height)
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if err != nil {
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return nil, err
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}
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return legacy.Cdc.MarshalJSON(res)
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}
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// get the current blockchain height
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func GetChainHeight(clientCtx client.Context) (int64, error) {
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node, err := clientCtx.GetNode()
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if err != nil {
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return -1, err
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}
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status, err := node.Status(context.Background())
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if err != nil {
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return -1, err
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}
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height := status.SyncInfo.LatestBlockHeight
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return height, nil
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}
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// REST handler to get a block
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func BlockRequestHandlerFn(clientCtx client.Context) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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height, err := strconv.ParseInt(vars["height"], 10, 64)
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if err != nil {
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rest.WriteErrorResponse(w, http.StatusBadRequest,
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"couldn't parse block height. Assumed format is '/block/{height}'.")
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return
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}
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chainHeight, err := GetChainHeight(clientCtx)
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if err != nil {
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rest.WriteErrorResponse(w, http.StatusInternalServerError, "failed to parse chain height")
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return
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}
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if height > chainHeight {
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rest.WriteErrorResponse(w, http.StatusNotFound, "requested block height is bigger then the chain length")
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return
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}
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output, err := getBlock(clientCtx, &height)
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if rest.CheckInternalServerError(w, err) {
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return
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}
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rest.PostProcessResponseBare(w, clientCtx, output)
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}
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}
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// REST handler to get the latest block
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func LatestBlockRequestHandlerFn(clientCtx client.Context) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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output, err := getBlock(clientCtx, nil)
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if rest.CheckInternalServerError(w, err) {
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return
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}
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rest.PostProcessResponseBare(w, clientCtx, output)
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}
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}
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