Solve the challenge

README.md

@@ -16,6 +16,8 @@ Concretely, we would like to see the following components added:
 - The addition of a new `AllComments` gRPC query method. This method's input should take a `post_slug` (a string), and returns all the comments on a post.
 - The addition of two CLI subcommands, `tx create-comment` and `query list-comments`, which call the `CreateComment` and `AllComments` service methods under the hood.
 
+See solution steps in [SOLUTION.md](SOLUTION.md)
+
 ## Requirements:
 
 - Go v1.17+: https://golang.org/

SOLUTION.md

@@ -0,0 +1,70 @@
+# Implementing task
+
+## Run node
+
+For first step command is from [here](https://docs.cosmos.network/v0.46/run-node/run-node.html)
+For next steps I followed this [instruction](https://docs.cosmos.network/v0.46/run-node/run-node.html)
+
+1. Build node
+
+    make build
+
+2. Init config of node with chain-id `my-test-chain`. `monadfix` is arbitrary string.
+
+        build/regen init monadfix --chain-id my-test-chain
+
+- `regen` used insted of `simd`
+- `--home` flag to specify dirictory of config. But then you should pass it to every command.
+
+3. Add account to network
+
+        build/regen keys add monadfix --keyring-backend test
+
+- where `monadfix` is custom name.
+
+4. Fetch address. We got `cosmos1728x3mclm0f980828tf74nq3vqvaxkkkdfwuc8`
+
+        build/regen keys show monadfix -a --keyring-backend test
+
+5. Add money to your address of your account. See address in step `4`
+
+        build/regen add-genesis-account cosmos1728x3mclm0f980828tf74nq3vqvaxkkkdfwuc8 100000000000stake
+
+6. Create validator
+
+        build/regen gentx monadfix 100000000stake --chain-id my-test-chain --keyring-backend test
+
+        build/regen collect-gentxs
+
+7. Update gas config in `app.toml`
+
+Modify `minimum-gas-prices` to `"0stake"`
+
+8. Run local blockchain network
+
+        build/regen start
+
+## Interact with blog
+
+0. Set chain-id
+
+        build/regen config chain-id my-test-chain
+
+1. Create post
+
+        build/regen tx blog create-post cosmos1728x3mclm0f980828tf74nq3vqvaxkkkdfwuc8 "first-post" "title" "body body body" --keyring-backend test -y
+
+2. List all posts
+
+        build/regen query blog list-post
+
+3. Comment has key is comprised by `comment` + `slug` + `_` + `uuidV7`.
+   Prefix `comment` is added by KVStore.
+
+4. Create comment
+
+          build/regen tx blog create-comment cosmos1728x3mclm0f980828tf74nq3vqvaxkkkdfwuc8 "first-slug" "comment comment" --keyring-backend test -y
+
+5. List comments of the particular slug
+
+          build/regen query blog list-comments "first-slug"

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/gorilla/mux v1.8.0
 	github.com/grpc-ecosystem/grpc-gateway v1.16.0
 	github.com/rakyll/statik v0.1.7
+	github.com/rs/zerolog v1.23.0
 	github.com/spf13/cast v1.3.1
 	github.com/spf13/cobra v1.2.1
 	github.com/stretchr/testify v1.7.0
@@ -89,7 +90,6 @@ require (
 	github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0 // indirect
 	github.com/regen-network/cosmos-proto v0.3.1 // indirect
 	github.com/rs/cors v1.7.0 // indirect
-	github.com/rs/zerolog v1.23.0 // indirect
 	github.com/sasha-s/go-deadlock v0.2.1-0.20190427202633-1595213edefa // indirect
 	github.com/spf13/afero v1.6.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
@@ -101,6 +101,7 @@ require (
 	github.com/tendermint/btcd v0.1.1 // indirect
 	github.com/tendermint/crypto v0.0.0-20191022145703-50d29ede1e15 // indirect
 	github.com/tendermint/go-amino v0.16.0 // indirect
+	github.com/uuid6/uuid6go-proto v0.2.1 // indirect
 	github.com/zondax/hid v0.9.0 // indirect
 	go.etcd.io/bbolt v1.3.5 // indirect
 	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 // indirect

go.sum

@@ -719,8 +719,6 @@ github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0/go.mod h1:bCqn
 github.com/regen-network/cosmos-proto v0.3.1 h1:rV7iM4SSFAagvy8RiyhiACbWEGotmqzywPxOvwMdxcg=
 github.com/regen-network/cosmos-proto v0.3.1/go.mod h1:jO0sVX6a1B36nmE8C9xBFXpNwWejXC7QqCOnH3O0+YM=
 github.com/regen-network/protobuf v1.3.2-alpha.regen.4 h1:c9jEnU+xm6vqyrQe3M94UFWqiXxRIKKnqBOh2EACmBE=
-github.com/regen-network/protobuf v1.3.2-alpha.regen.4 h1:c9jEnU+xm6vqyrQe3M94UFWqiXxRIKKnqBOh2EACmBE=
-github.com/regen-network/protobuf v1.3.2-alpha.regen.4/go.mod h1:/J8/bR1T/NXyIdQDLUaq15LjNE83nRzkyrLAMcPewig=
 github.com/regen-network/protobuf v1.3.2-alpha.regen.4/go.mod h1:/J8/bR1T/NXyIdQDLUaq15LjNE83nRzkyrLAMcPewig=
 github.com/rjeczalik/notify v0.9.1/go.mod h1:rKwnCoCGeuQnwBtTSPL9Dad03Vh2n40ePRrjvIXnJho=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
@@ -834,6 +832,8 @@ github.com/ugorji/go/codec v1.1.7 h1:2SvQaVZ1ouYrrKKwoSk2pzd4A9evlKJb9oTL+OaLUSs
 github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+github.com/uuid6/uuid6go-proto v0.2.1 h1:wuHy43Hy7CnWnWOkQGthek1YO43SQD+A/X+YaDH5B3Q=
+github.com/uuid6/uuid6go-proto v0.2.1/go.mod h1:SFdogh0w3t8piuOBD4PXotblZWBqP2wospaF7txygWQ=
 github.com/vishvananda/netlink v1.1.0/go.mod h1:cTgwzPIzzgDAYoQrMm0EdrjRUBkTqKYppBueQtXaqoE=
 github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17pCcGlemwknint6hfoeCVQrEMVwxRLRjXpq+BU=
 github.com/vmihailenco/msgpack/v5 v5.1.4/go.mod h1:C5gboKD0TJPqWDTVTtrQNfRbiBwHZGo8UTqP/9/XvLI=

proto/blog/v1/query.proto

@@ -9,6 +9,7 @@ import "blog/v1/types.proto";
 // Query defines the gRPC querier service.
 service Query {
   rpc AllPosts(QueryAllPostsRequest) returns (QueryAllPostsResponse);
+  rpc PostComments(QueryPostCommentsRequest) returns (QueryPostCommentsResponse);
 }
 
 message QueryAllPostsRequest {
@@ -20,3 +21,14 @@ message QueryAllPostsResponse {
 
   cosmos.base.query.v1beta1.PageResponse pagination = 2;
 }
+
+message QueryPostCommentsRequest {
+  cosmos.base.query.v1beta1.PageRequest pagination = 1;
+  string slug = 2;
+}
+
+message QueryPostCommentsResponse {
+  repeated Comment comments = 1;
+
+  cosmos.base.query.v1beta1.PageResponse pagination = 2;
+}

proto/blog/v1/tx.proto

@@ -6,6 +6,7 @@ option go_package = "github.com/regen-network/bec/x/blog";
 // Msg is the blog.v1 Msg service
 service Msg {
   rpc CreatePost(MsgCreatePost) returns (MsgCreatePostResponse);
+  rpc CreateComment(MsgCreateComment) returns (MsgCreateCommentResponse);
 }
 
 // MsgCreatePost is the Msg/CreatePost request type.
@@ -18,3 +19,13 @@ message MsgCreatePost {
 
 // MsgCreatePostResponse is the Msg/CreatePost response type.
 message MsgCreatePostResponse {}
+
+// MsgCreateComment is the Msg/CreateComment request type.
+message MsgCreateComment {
+  string slug = 1;
+  string author = 2;
+  string body = 3;
+}
+
+// MsgCreateCommentResponse is the Msg/CreateComment response type.
+message MsgCreateCommentResponse {}

proto/blog/v1/types.proto

@@ -11,3 +11,12 @@ message Post {
   string title = 3;
   string body = 4;
 }
+
+message Comment {
+  // slug is a short human-readable string for the post, used as unique
+  // identifier for the post.
+  string slug = 1;
+  string author = 2;
+  string body = 3;
+}
+

x/blog/client/cli/query.go

@@ -23,7 +23,10 @@ func GetQueryCmd() *cobra.Command {
 		RunE:                       client.ValidateCmd,
 	}
 
-	cmd.AddCommand(CmdAllPosts())
+	cmd.AddCommand(
+		CmdAllPosts(),
+		CmdPostComments(),
+	)
 
 	return cmd
 }
@@ -63,3 +66,44 @@ func CmdAllPosts() *cobra.Command {
 
 	return cmd
 }
+
+func CmdPostComments() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "list-comments [slug]",
+		Short: "list all comments of the post",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+
+			argsSlug := string(args[0])
+
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+
+			pageReq, err := client.ReadPageRequest(cmd.Flags())
+			if err != nil {
+				return err
+			}
+
+			queryClient := blog.NewQueryClient(clientCtx)
+
+			params := &blog.QueryPostCommentsRequest{
+				Pagination: pageReq,
+				Slug:       argsSlug,
+			}
+
+			res, err := queryClient.PostComments(cmd.Context(), params)
+			if err != nil {
+				return err
+			}
+
+			return clientCtx.PrintProto(res)
+		},
+	}
+
+	flags.AddQueryFlagsToCmd(cmd)
+	flags.AddPaginationFlagsToCmd(cmd, "blog")
+
+	return cmd
+}

x/blog/client/cli/tx.go

@@ -21,7 +21,10 @@ func GetTxCmd() *cobra.Command {
 		RunE:                       client.ValidateCmd,
 	}
 
-	cmd.AddCommand(CmdCreatePost())
+	cmd.AddCommand(
+		CmdCreatePost(),
+		CmdCreateComment(),
+	)
 
 	return cmd
 }
@@ -61,3 +64,37 @@ func CmdCreatePost() *cobra.Command {
 
 	return cmd
 }
+
+func CmdCreateComment() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "create-comment [author] [slug] [body]",
+		Short: "Creates a new comment",
+		Args:  cobra.ExactArgs(3),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			err := cmd.Flags().Set(flags.FlagFrom, args[0])
+			if err != nil {
+				return err
+			}
+
+			argsSlug := string(args[1])
+			argsBody := string(args[2])
+
+			clientCtx, err := client.GetClientTxContext(cmd)
+			if err != nil {
+				return err
+			}
+
+			msg := &blog.MsgCreateComment{
+				Author: clientCtx.GetFromAddress().String(),
+				Slug:   argsSlug,
+				Body:   argsBody,
+			}
+
+			return tx.GenerateOrBroadcastTxCLI(clientCtx, cmd.Flags(), msg)
+		},
+	}
+
+	flags.AddTxFlagsToCmd(cmd)
+
+	return cmd
+}

x/blog/keys.go

@@ -4,7 +4,8 @@ const (
 	ModuleName = "blog"
 	StoreKey   = ModuleName
 
-	PostKey = "post"
+	PostKey    = "post"
+	CommentKey = "comment"
 )
 
 func KeyPrefix(p string) []byte {