138 lines
2.9 KiB
Go
138 lines
2.9 KiB
Go
package rpc
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import (
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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/context"
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)
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const (
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flagSelect = "select"
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)
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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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RunE: printBlock,
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}
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cmd.Flags().StringP(client.FlagNode, "n", "tcp://localhost:46657", "Node to connect to")
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// TODO: change this to false when we can
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cmd.Flags().Bool(client.FlagTrustNode, true, "Don't verify proofs for responses")
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cmd.Flags().StringSlice(flagSelect, []string{"header", "tx"}, "Fields to return (header|txs|results)")
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return cmd
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}
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func getBlock(height *int64) ([]byte, error) {
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// get the node
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ctx := context.NewCoreContextFromViper()
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node, err := ctx.GetNode()
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if err != nil {
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return nil, err
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}
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// TODO: actually honor the --select flag!
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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(height)
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if err != nil {
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return nil, err
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}
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// TODO move maarshalling into cmd/rest functions
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// output, err := tmwire.MarshalJSON(res)
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output, err := cdc.MarshalJSON(res)
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if err != nil {
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return nil, err
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}
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return output, nil
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}
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// get the current blockchain height
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func GetChainHeight() (int64, error) {
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node, err := context.NewCoreContextFromViper().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()
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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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// CMD
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func printBlock(cmd *cobra.Command, args []string) error {
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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(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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// REST
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// REST handler to get a block
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func BlockRequestHandler(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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w.WriteHeader(400)
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w.Write([]byte("ERROR: 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()
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if height > chainHeight {
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w.WriteHeader(404)
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w.Write([]byte("ERROR: 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(&height)
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if err != nil {
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w.WriteHeader(500)
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w.Write([]byte(err.Error()))
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return
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}
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w.Write(output)
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}
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// REST handler to get the latest block
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func LatestBlockRequestHandler(w http.ResponseWriter, r *http.Request) {
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height, err := GetChainHeight()
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if err != nil {
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w.WriteHeader(500)
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w.Write([]byte(err.Error()))
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return
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}
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output, err := getBlock(&height)
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if err != nil {
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w.WriteHeader(500)
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w.Write([]byte(err.Error()))
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return
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}
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w.Write(output)
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}
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