feat(cli): add read voucher command

cmd/cartesi-rollups-cli/root/read/read.go

@@ -8,6 +8,7 @@ import (
 	"github.com/cartesi/rollups-node/cmd/cartesi-rollups-cli/root/read/inputs"
 	"github.com/cartesi/rollups-node/cmd/cartesi-rollups-cli/root/read/notice"
 	"github.com/cartesi/rollups-node/cmd/cartesi-rollups-cli/root/read/notices"
+	"github.com/cartesi/rollups-node/cmd/cartesi-rollups-cli/root/read/voucher"
 	"github.com/spf13/cobra"
 )
 
@@ -21,4 +22,5 @@ func init() {
 	Cmd.AddCommand(inputs.Cmd)
 	Cmd.AddCommand(notice.Cmd)
 	Cmd.AddCommand(notices.Cmd)
+	Cmd.AddCommand(voucher.Cmd)
 }

cmd/cartesi-rollups-cli/root/read/voucher/voucher.go

@@ -0,0 +1,57 @@
+// (c) Cartesi and individual authors (see AUTHORS)
+// SPDX-License-Identifier: Apache-2.0 (see LICENSE)
+
+package voucher
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/Khan/genqlient/graphql"
+	"github.com/cartesi/rollups-node/pkg/readerclient"
+	"github.com/spf13/cobra"
+)
+
+var Cmd = &cobra.Command{
+	Use:     "voucher",
+	Short:   "Reads a voucher",
+	Example: examples,
+	Run:     run,
+}
+
+const examples = `# Read voucher 5 from input 6:
+cartesi-rollups-cli read voucher --voucher-index 5 --input-index 6`
+
+var (
+	voucherIndex    int
+	inputIndex      int
+	graphqlEndpoint string
+)
+
+func init() {
+	Cmd.Flags().IntVar(&voucherIndex, "voucher-index", 0,
+		"index of the voucher")
+
+	cobra.CheckErr(Cmd.MarkFlagRequired("voucher-index"))
+
+	Cmd.Flags().IntVar(&inputIndex, "input-index", 0,
+		"index of the input")
+
+	cobra.CheckErr(Cmd.MarkFlagRequired("input-index"))
+
+	Cmd.Flags().StringVar(&graphqlEndpoint, "graphql-endpoint", "http://0.0.0.0:4000/graphql",
+		"address used to connect to graphql")
+}
+
+func run(cmd *cobra.Command, args []string) {
+	ctx := cmd.Context()
+	client := graphql.NewClient(graphqlEndpoint, nil)
+
+	resp, err := readerclient.GetVoucher(ctx, client, voucherIndex, inputIndex)
+	cobra.CheckErr(err)
+
+	val, err := json.MarshalIndent(resp, "", "    ")
+	cobra.CheckErr(err)
+
+	fmt.Print(string(val))
+}

pkg/readerclient/generate/voucher.graphql

@@ -0,0 +1,23 @@
+query getVoucher($voucherIndex: Int!, $inputIndex: Int!) {
+  voucher(voucherIndex: $voucherIndex, inputIndex: $inputIndex) {
+    index
+    payload
+    destination
+    proof {
+      validity {
+        inputIndexWithinEpoch
+        outputIndexWithinInput
+        outputHashesRootHash
+        vouchersEpochRootHash
+        noticesEpochRootHash
+        machineStateHash
+        outputHashInOutputHashesSiblings
+        outputHashesInEpochSiblings
+      }
+      context
+    }
+    input {
+      index
+    }
+  }
+}

pkg/readerclient/genqlient.yaml

@@ -10,6 +10,7 @@ operations:
 - generate/notice.graphql
 - generate/notices.graphql
 - generate/input_notices.graphql
+- generate/voucher.graphql
 generated: generated.go
 package: readerclient