vchunikhin commented on code in PR #22556:
URL: https://github.com/apache/beam/pull/22556#discussion_r955976273


##########
learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go:
##########
@@ -0,0 +1,51 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+       "context"
+       "fmt"
+       "log"
+       "os"
+
+       "beam.apache.org/learning/tour-of-beam/backend/internal/fs_content"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+       "cloud.google.com/go/datastore"
+)
+
+var repo storage.Iface
+
+func init() {
+       client, err := datastore.NewClient(context.Background(), "")

Review Comment:
   It seems that we can remove the second parameter here because the default 
value of string is an empty string



##########
learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go:
##########
@@ -0,0 +1,51 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+       "context"
+       "fmt"
+       "log"
+       "os"
+
+       "beam.apache.org/learning/tour-of-beam/backend/internal/fs_content"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+       "cloud.google.com/go/datastore"
+)
+
+var repo storage.Iface
+
+func init() {
+       client, err := datastore.NewClient(context.Background(), "")
+       if err != nil {
+               log.Fatalf("new datastore client: %v", err)
+       }
+       repo = &storage.DatastoreDb{Client: client}
+}
+
+func main() {
+       learningRoot := os.Getenv("TOB_LEARNING_ROOT")

Review Comment:
   While you don't use viper lib i recommend you set "TOB_LEARNING_ROOT" as a 
constant here and anywhere in the project for environment variables at all 



##########
learning/tour-of-beam/backend/function.go:
##########
@@ -0,0 +1,93 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package tob
+
+import (
+       "context"
+       "encoding/json"
+       "fmt"
+       "log"
+       "net/http"
+       "os"
+
+       tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/service"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+
+       "cloud.google.com/go/datastore"
+       "github.com/GoogleCloudPlatform/functions-framework-go/functions"
+)
+
+var svc service.IContent
+
+func init() {
+       // dependencies
+       // required:
+       // * TOB_MOCK: respond with static samples
+       // OR
+       // * DATASTORE_PROJECT_ID: cloud project id
+       // optional:
+       // * DATASTORE_EMULATOR_HOST: emulator host/port (ex. 0.0.0.0:8888)
+       if os.Getenv("TOB_MOCK") > "" {
+               svc = &service.Mock{}
+       } else {
+               client, err := datastore.NewClient(context.Background(), "")
+               if err != nil {
+                       log.Fatalf("new datastore client: %v", err)
+               }
+               svc = &service.Svc{Repo: &storage.DatastoreDb{Client: client}}
+       }
+
+       // functions framework
+       functions.HTTP("sdkList", sdkList)

Review Comment:
   Maybe... can we develop the function that return the name of function and 
this function itself by reflection?
   I want to avoid the extra action required from a developer, namely, write 
function name always 
   
   yee... i'm lazy, i know :)



##########
learning/tour-of-beam/backend/internal/entity.go:
##########
@@ -0,0 +1,69 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+type Unit struct {
+       Id   string `json:"unitId"`
+       Name string `json:"name"`
+
+       // optional
+       Description       string   `json:"description,omitempty"`
+       Hints             []string `json:"hints,omitempty"`
+       TaskSnippetId     string   `json:"taskSnippetId,omitempty"`
+       SolutionSnippetId string   `json:"solutionSnippetId,omitempty"`
+       TaskName          string   `json:"-"`
+       SolutionName      string   `json:"-"`
+
+       // optional, user-specific
+       UserSnippetId string `json:"userSnippetId,omitempty"`
+       IsCompleted   string `json:"is_completed,omitempty"`

Review Comment:
   use camelCase everywhere, don't use "is_completed" here



##########
learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go:
##########
@@ -0,0 +1,51 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+       "context"
+       "fmt"
+       "log"
+       "os"
+
+       "beam.apache.org/learning/tour-of-beam/backend/internal/fs_content"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+       "cloud.google.com/go/datastore"
+)
+
+var repo storage.Iface
+
+func init() {
+       client, err := datastore.NewClient(context.Background(), "")
+       if err != nil {
+               log.Fatalf("new datastore client: %v", err)
+       }
+       repo = &storage.DatastoreDb{Client: client}
+}
+
+func main() {
+       learningRoot := os.Getenv("TOB_LEARNING_ROOT")
+       fmt.Printf("Parsing learning-content at %q\n", learningRoot)

Review Comment:
   logs should be written with lower case



##########
learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go:
##########
@@ -0,0 +1,51 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+       "context"
+       "fmt"
+       "log"
+       "os"
+
+       "beam.apache.org/learning/tour-of-beam/backend/internal/fs_content"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+       "cloud.google.com/go/datastore"
+)
+
+var repo storage.Iface
+
+func init() {
+       client, err := datastore.NewClient(context.Background(), "")
+       if err != nil {
+               log.Fatalf("new datastore client: %v", err)
+       }
+       repo = &storage.DatastoreDb{Client: client}

Review Comment:
   Yes, we're able to code like that but i'd create a constructor for this 
structure, up to you



##########
learning/tour-of-beam/backend/cmd/ci_cd/ci_cd.go:
##########
@@ -0,0 +1,51 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+       "context"
+       "fmt"
+       "log"
+       "os"
+
+       "beam.apache.org/learning/tour-of-beam/backend/internal/fs_content"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+       "cloud.google.com/go/datastore"
+)
+
+var repo storage.Iface
+
+func init() {
+       client, err := datastore.NewClient(context.Background(), "")
+       if err != nil {
+               log.Fatalf("new datastore client: %v", err)
+       }
+       repo = &storage.DatastoreDb{Client: client}
+}
+
+func main() {
+       learningRoot := os.Getenv("TOB_LEARNING_ROOT")
+       fmt.Printf("Parsing learning-content at %q\n", learningRoot)
+       trees, err := fs_content.CollectLearningTree(learningRoot)
+       if err != nil {
+               log.Fatal(err)
+       }
+
+       fmt.Printf("collected %v sdks\n", len(trees))
+       if err = repo.SaveContentTrees(context.Background(), trees); err != nil 
{

Review Comment:
   It's the second point where you use context.Background() in this file. The 
best way to declare one context above and use him anywhere. Don't create extra 
contexts



##########
learning/tour-of-beam/backend/function.go:
##########
@@ -0,0 +1,93 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package tob
+
+import (
+       "context"
+       "encoding/json"
+       "fmt"
+       "log"
+       "net/http"
+       "os"
+
+       tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/service"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+
+       "cloud.google.com/go/datastore"
+       "github.com/GoogleCloudPlatform/functions-framework-go/functions"
+)
+
+var svc service.IContent
+
+func init() {
+       // dependencies
+       // required:
+       // * TOB_MOCK: respond with static samples
+       // OR
+       // * DATASTORE_PROJECT_ID: cloud project id
+       // optional:
+       // * DATASTORE_EMULATOR_HOST: emulator host/port (ex. 0.0.0.0:8888)
+       if os.Getenv("TOB_MOCK") > "" {

Review Comment:
   Why did you use '>' here?



##########
learning/tour-of-beam/backend/cmd/main.go:
##########
@@ -0,0 +1,36 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+       "log"
+       "os"
+
+       // Blank-import the function package so the init() runs
+       _ "beam.apache.org/learning/tour-of-beam/backend"
+       "github.com/GoogleCloudPlatform/functions-framework-go/funcframework"
+)
+
+func main() {
+       // Use PORT environment variable, or default to 8080.
+       port := "8080"

Review Comment:
   Should be as a constant in the file



##########
learning/tour-of-beam/backend/function.go:
##########
@@ -0,0 +1,93 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package tob
+
+import (
+       "context"
+       "encoding/json"
+       "fmt"
+       "log"
+       "net/http"
+       "os"
+
+       tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/service"
+       "beam.apache.org/learning/tour-of-beam/backend/internal/storage"
+
+       "cloud.google.com/go/datastore"
+       "github.com/GoogleCloudPlatform/functions-framework-go/functions"
+)
+
+var svc service.IContent
+
+func init() {
+       // dependencies
+       // required:
+       // * TOB_MOCK: respond with static samples
+       // OR
+       // * DATASTORE_PROJECT_ID: cloud project id
+       // optional:
+       // * DATASTORE_EMULATOR_HOST: emulator host/port (ex. 0.0.0.0:8888)
+       if os.Getenv("TOB_MOCK") > "" {
+               svc = &service.Mock{}
+       } else {
+               client, err := datastore.NewClient(context.Background(), "")
+               if err != nil {
+                       log.Fatalf("new datastore client: %v", err)
+               }
+               svc = &service.Svc{Repo: &storage.DatastoreDb{Client: client}}
+       }
+
+       // functions framework
+       functions.HTTP("sdkList", sdkList)
+       functions.HTTP("getContentTree", getContentTree)
+       //functions.HTTP("getUnitContent", getUnitContent)
+}
+
+func finalizeErrResponse(w http.ResponseWriter, status int, code, message 
string) {
+       w.WriteHeader(status)
+       resp := tob.CodeMessage{Code: code, Message: message}
+       _ = json.NewEncoder(w).Encode(resp)
+}
+
+func sdkList(w http.ResponseWriter, r *http.Request) {
+       fmt.Fprintln(w, `{"names": ["Java", "Python", "Go"]}`)
+}
+
+func getContentTree(w http.ResponseWriter, r *http.Request) {
+       w.Header().Add("Content-Type", "application/json")
+       if r.Method != "GET" {
+               w.WriteHeader(http.StatusMethodNotAllowed)
+               return
+       }
+
+       sdkStr := r.URL.Query().Get("sdk")
+       sdk := tob.FromString(sdkStr)
+       if sdk == tob.SDK_UNDEFINED {
+               finalizeErrResponse(w, http.StatusBadRequest, "BAD_FORMAT", 
fmt.Sprintf("Bad sdk: %v", sdkStr))

Review Comment:
   use constants here too for these messages as "BAD_FORMAT" and 
"INTERNAL_ERROR"



##########
learning/tour-of-beam/backend/go.mod:
##########
@@ -0,0 +1,60 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+module beam.apache.org/learning/tour-of-beam/backend
+
+go 1.18
+
+require (
+       github.com/GoogleCloudPlatform/functions-framework-go v1.5.3
+       gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+       cloud.google.com/go v0.102.1 // indirect

Review Comment:
   It looks that you should run "mod tidy" again because this command, as i 
know, groups dependencies into direct and indirect



##########
learning/tour-of-beam/backend/internal/storage/adapter.go:
##########
@@ -0,0 +1,146 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import (
+       "fmt"
+
+       tob "beam.apache.org/learning/tour-of-beam/backend/internal"
+       "cloud.google.com/go/datastore"
+)
+
+func sdk2Key(sdk tob.Sdk) string {

Review Comment:
   Mmm.... maybe sdkToKey or just toKey will be better
   I just don't like use "2" instead of to :)



##########
learning/tour-of-beam/backend/internal/entity.go:
##########
@@ -0,0 +1,69 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal

Review Comment:
   Are you sure that it's ok that the internal package associated with 
entities? Maybe should we create a model package or smth like that?



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