From 189507dc89958daab0e04d5674a0b1f69f15056d Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Thu, 23 Jun 2022 17:21:43 +0300
Subject: [PATCH] [#1541] neofs-cli: allow to print `shards list` output in
 JSON

Eventually more parameters will be supported (#1390) and after blobstor
configuration refactoring the output will certainly change. Implement
the simplest approach now.

Marshaling the result directly results in too ugly names and they cannot
be easily customized. Marshaling the results via `jsonpb` is better but
is not that flexible in terms of what we want to output.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
---
 cmd/neofs-cli/modules/control/shards_list.go | 59 +++++++++++++++-----
 1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/cmd/neofs-cli/modules/control/shards_list.go b/cmd/neofs-cli/modules/control/shards_list.go
index 8a4a550e..7244ebd0 100644
--- a/cmd/neofs-cli/modules/control/shards_list.go
+++ b/cmd/neofs-cli/modules/control/shards_list.go
@@ -1,6 +1,8 @@
 package control
 
 import (
+	"bytes"
+	"encoding/json"
 	"fmt"
 
 	"github.com/mr-tron/base58"
@@ -25,6 +27,7 @@ func initControlShardsListCmd() {
 	flags := listShardsCmd.Flags()
 
 	flags.String(controlRPC, controlRPCDefault, controlRPCUsage)
+	flags.Bool(commonflags.JSON, false, "Print shard info as a JSON array")
 }
 
 func listShards(cmd *cobra.Command, _ []string) {
@@ -47,24 +50,37 @@ func listShards(cmd *cobra.Command, _ []string) {
 
 	verifyResponse(cmd, resp.GetSignature(), resp.GetBody())
 
-	prettyPrintShards(cmd, resp.GetBody().GetShards())
+	isJSON, _ := cmd.Flags().GetBool(commonflags.JSON)
+	if isJSON {
+		prettyPrintShardsJSON(cmd, resp.GetBody().GetShards())
+	} else {
+		prettyPrintShards(cmd, resp.GetBody().GetShards())
+	}
+}
+
+func prettyPrintShardsJSON(cmd *cobra.Command, ii []*control.ShardInfo) {
+	out := make([]map[string]interface{}, 0, len(ii))
+	for _, i := range ii {
+		out = append(out, map[string]interface{}{
+			"shard_id":    base58.Encode(i.Shard_ID),
+			"mode":        shardModeToString(i.GetMode()),
+			"metabase":    i.GetMetabasePath(),
+			"blobstor":    i.GetBlobstorPath(),
+			"writecache":  i.GetWritecachePath(),
+			"error_count": i.GetErrorCount(),
+		})
+	}
+
+	buf := bytes.NewBuffer(nil)
+	enc := json.NewEncoder(buf)
+	enc.SetIndent("", "  ")
+	common.ExitOnErr(cmd, "cannot shard info to JSON: %w", enc.Encode(out))
+
+	cmd.Print(buf.String()) // pretty printer emits newline, to no need for Println
 }
 
 func prettyPrintShards(cmd *cobra.Command, ii []*control.ShardInfo) {
 	for _, i := range ii {
-		var mode string
-
-		switch i.GetMode() {
-		case control.ShardMode_READ_WRITE:
-			mode = "read-write"
-		case control.ShardMode_READ_ONLY:
-			mode = "read-only"
-		case control.ShardMode_DEGRADED:
-			mode = "degraded"
-		default:
-			mode = "unknown"
-		}
-
 		pathPrinter := func(name, path string) string {
 			if path == "" {
 				return ""
@@ -79,7 +95,20 @@ func prettyPrintShards(cmd *cobra.Command, ii []*control.ShardInfo) {
 			pathPrinter("Write-cache", i.GetWritecachePath())+
 			fmt.Sprintf("Error count: %d\n", i.GetErrorCount()),
 			base58.Encode(i.Shard_ID),
-			mode,
+			shardModeToString(i.GetMode()),
 		)
 	}
 }
+
+func shardModeToString(m control.ShardMode) string {
+	switch m {
+	case control.ShardMode_READ_WRITE:
+		return "read-write"
+	case control.ShardMode_READ_ONLY:
+		return "read-only"
+	case control.ShardMode_DEGRADED:
+		return "degraded"
+	default:
+		return "unknown"
+	}
+}