Use golangci-lint

.github/workflows/golangci-lint.yml

@@ -0,0 +1,56 @@
+name: golangci-lint
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+permissions:
+  contents: read
+  # Optional: allow read access to pull request. Use with `only-new-issues` option.
+  pull-requests: read
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version: '1.21'
+          cache: true
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          # Require: The version of golangci-lint to use.
+          # When `install-mode` is `binary` (default) the value can be v1.2 or v1.2.3 or `latest` to use the latest version.
+          # When `install-mode` is `goinstall` the value can be v1.2.3, `latest`, or the hash of a commit.
+          version: v1.54.2
+
+          # Optional: working directory, useful for monorepos
+          # working-directory: somedir
+
+          # Optional: golangci-lint command line arguments.
+          #
+          # Note: By default, the `.golangci.yml` file should be at the root of the repository.
+          # The location of the configuration file can be changed by using `--config=`
+          # args: --timeout=30m --config=/my/path/.golangci.yml --issues-exit-code=0
+
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true
+
+          # Optional: if set to true, then all caching functionality will be completely disabled,
+          #           takes precedence over all other caching options.
+          # skip-cache: true
+
+          # Optional: if set to true, then the action won't cache or restore ~/go/pkg.
+          # skip-pkg-cache: true
+
+          # Optional: if set to true, then the action won't cache or restore ~/.cache/go-build.
+          # skip-build-cache: true
+
+          # Optional: The mode to install golangci-lint. It can be 'binary' or 'goinstall'.
+          # install-mode: "goinstall"

.golangci.yml

@@ -0,0 +1,194 @@
+# Options for analysis running.
+run:
+  # Number of CPUs to use when running golangci-lint.
+  # Default: the number of logical CPUs in the machine
+  concurrency: 4
+  # Timeout for analysis, e.g. 30s, 5m.
+  # Default: 1m
+  timeout: 5m
+  # Exit code when at least one issue was found.
+  # Default: 1
+  issues-exit-code: 2
+  # Include test files or not.
+  # Default: true
+  tests: false
+  # List of build tags, all linters use it.
+  # Default: []
+  build-tags: []
+  # Which dirs to skip: issues from them won't be reported.
+  # Can use regexp here: `generated.*`, regexp is applied on full path,
+  # including the path prefix if one is set.
+  # Default dirs are skipped independently of this option's value (see skip-dirs-use-default).
+  # "/" will be replaced by current OS file path separator to properly work on Windows.
+  # Default: []
+  skip-dirs:
+    - protobuf
+    - examples
+  # Enables skipping of directories:
+  # - vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
+  # Default: true
+  skip-dirs-use-default: false
+  # Which files to skip: they will be analyzed, but issues from them won't be reported.
+  # There is no need to include all autogenerated files,
+  # we confidently recognize autogenerated files.
+  # If it's not, please let us know.
+  # "/" will be replaced by current OS file path separator to properly work on Windows.
+  # Default: []
+  skip-files: []
+  # If set, we pass it to "go list -mod={option}". From "go help modules":
+  # If invoked with -mod=readonly, the go command is disallowed from the implicit
+  # automatic updating of go.mod described above. Instead, it fails when any changes
+  # to go.mod are needed. This setting is most useful to check that go.mod does
+  # not need updates, such as in a continuous integration and testing system.
+  # If invoked with -mod=vendor, the go command assumes that the vendor
+  # directory holds the correct copies of dependencies and ignores
+  # the dependency descriptions in go.mod.
+  #
+  # Allowed values: readonly|vendor|mod
+  # Default: ""
+  modules-download-mode: readonly
+  # Allow multiple parallel golangci-lint instances running.
+  # If false, golangci-lint acquires file lock on start.
+  # Default: false
+  allow-parallel-runners: false
+  # Define the Go version limit.
+  # Mainly related to generics support since go1.18.
+  # Default: use Go version from the go.mod file, fallback on the env var `GOVERSION`, fallback on 1.17
+  go: '1.21'
+# output configuration options
+output:
+  # Format: colored-line-number|line-number|json|colored-tab|tab|checkstyle|code-climate|junit-xml|github-actions|teamcity
+  #
+  # Multiple can be specified by separating them by comma, output can be provided
+  # for each of them by separating format name and path by colon symbol.
+  # Output path can be either `stdout`, `stderr` or path to the file to write to.
+  # Example: "checkstyle:report.xml,json:stdout,colored-line-number"
+  #
+  # Default: colored-line-number
+  #format: json
+  # Print lines of code with issue.
+  # Default: true
+  #print-issued-lines: false
+  # Print linter name in the end of issue text.
+  # Default: true
+  #print-linter-name: false
+  # Make issues output unique by line.
+  # Default: true
+  #uniq-by-line: false
+  # Add a prefix to the output file references.
+  # Default: ""
+  #path-prefix: ""
+  # Sort results by: filepath, line and column.
+  # Default: false
+  sort-results: true
+linters:
+  enable-all: true
+  disable:
+    - scopelint
+    - nosnakecase
+    - ifshort
+    - depguard
+    - gci
+  # Run only fast linters from enabled linters set (first run won't be fast)
+  # Default: false
+  fast: true
+issues:
+  # List of regexps of issue texts to exclude.
+  #
+  # But independently of this option we use default exclude patterns,
+  # it can be disabled by `exclude-use-default: false`.
+  # To list all excluded by default patterns execute `golangci-lint run --help`
+  #
+  # Default: https://golangci-lint.run/usage/false-positives/#default-exclusions
+  exclude: []
+  # Excluding configuration per-path, per-linter, per-text and per-source
+  exclude-rules:
+    # Exclude some linters from running on tests files.
+    - path: _test\.go
+      linters:
+        - gocyclo
+        - errcheck
+        - dupl
+        - gosec
+    # Run some linter only for test files by excluding its issues for everything else.
+    - path-except: _test\.go
+      linters:
+        - forbidigo
+    # Exclude known linters from partially hard-vendored code,
+    # which is impossible to exclude via `nolint` comments.
+    # `/` will be replaced by current OS file path separator to properly work on Windows.
+    - path: internal/hmac/
+      text: "weak cryptographic primitive"
+      linters:
+        - gosec
+    # Exclude some `staticcheck` messages.
+    - linters:
+        - staticcheck
+      text: "SA9003:"
+    # Exclude `lll` issues for long lines with `go:generate`.
+    - linters:
+        - lll
+      source: "^//go:generate "
+  # Independently of option `exclude` we use default exclude patterns,
+  # it can be disabled by this option.
+  # To list all excluded by default patterns execute `golangci-lint run --help`.
+  # Default: true
+  #exclude-use-default: false
+  # If set to true exclude and exclude-rules regular expressions become case-sensitive.
+  # Default: false
+  exclude-case-sensitive: false
+  # The list of ids of default excludes to include or disable.
+  # https://golangci-lint.run/usage/false-positives/#default-exclusions
+  # Default: []
+  include: []
+  # Maximum issues count per one linter.
+  # Set to 0 to disable.
+  # Default: 50
+  max-issues-per-linter: 0
+  # Maximum count of issues with the same text.
+  # Set to 0 to disable.
+  # Default: 3
+  max-same-issues: 0
+  # Show only new issues: if there are unstaged changes or untracked files,
+  # only those changes are analyzed, else only changes in HEAD~ are analyzed.
+  # It's a super-useful option for integration of golangci-lint into existing large codebase.
+  # It's not practical to fix all existing issues at the moment of integration:
+  # much better don't allow issues in new code.
+  #
+  # Default: false
+  #new: true
+  # Show only new issues created after git revision `REV`.
+  # Default: ""
+  #new-from-rev: HEAD
+  # Show only new issues created in git patch with set file path.
+  # Default: ""
+  #new-from-patch: path/to/patch/file
+  # Fix found issues (if it's supported by the linter).
+  # Default: false
+  fix: true
+severity:
+  # Set the default severity for issues.
+  #
+  # If severity rules are defined and the issues do not match or no severity is provided to the rule
+  # this will be the default severity applied.
+  # Severities should match the supported severity names of the selected out format.
+  # - Code climate: https://docs.codeclimate.com/docs/issues#issue-severity
+  # - Checkstyle: https://checkstyle.sourceforge.io/property_types.html#SeverityLevel
+  # - GitHub: https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-error-message
+  # - TeamCity: https://www.jetbrains.com/help/teamcity/service-messages.html#Inspection+Instance
+  #
+  # Default: ""
+  default-severity: error
+  # If set to true `severity-rules` regular expressions become case-sensitive.
+  # Default: false
+  case-sensitive: true
+  # When a list of severity rules are provided, severity information will be added to lint issues.
+  # Severity rules have the same filtering capability as exclude rules
+  # except you are allowed to specify one matcher per severity rule.
+  # Only affects out formats that support setting severity information.
+  #
+  # Default: []
+  rules:
+    - linters:
+        - dupl
+      severity: info

cmd/protoc-gen-go-kvstore/internal/generators/generate.go

@@ -16,14 +16,41 @@ import (
 )
 
 func GenerateFile(gen *protogen.Plugin, file *protogen.File) {
-
 	templateCtx := kvstoreTemplateContext{
 		PackageName: string(file.GoPackageName),
 		GenVersion:  version.Version,
-		Pairs:       map[string]storagePair{},
+		Pairs:       extractKeyValuePairs(file),
+	}
+
+	value, err := Render(templateCtx)
+	if err != nil {
+		fmt.Printf("%s\n", err)
+
+		return
+	}
+
+	fmtValue, err := formatGoCode([]byte(value))
+	if err != nil {
+		panic(err)
+	}
+
+	filename := file.GeneratedFilenamePrefix + "_kvstore.pb.go"
+	g := gen.NewGeneratedFile(filename, file.GoImportPath)
+	_, err = g.Write(fmtValue)
+
+	if err != nil {
+		fmt.Printf("%s\n", err)
+
+		return
 	}
 
+	return
+}
+
+func extractKeyValuePairs(file *protogen.File) map[string]storagePair {
+	templatePairs := make(map[string]storagePair)
 	pairs, err := optparse.ExtractPairs(file.Messages)
+
 	if err != nil {
 		panic(err)
 	}
@@ -44,7 +71,7 @@ func GenerateFile(gen *protogen.Plugin, file *protogen.File) {
 			valueKind = pair.ValueDesc.Fields().Get(0).Kind()
 		}
 
-		templateCtx.Pairs[name] = storagePair{
+		templatePairs[name] = storagePair{
 			CodeSafeName: strcase.ToCamel(name),
 			KeySpecs: keySpecs{
 				Opts:        pair.KeyOptions,
@@ -61,26 +88,7 @@ func GenerateFile(gen *protogen.Plugin, file *protogen.File) {
 		}
 	}
 
-	value, err := Render(templateCtx)
-	if err != nil {
-		fmt.Printf("%s\n", err)
-		return
-	}
-
-	fmtValue, err := formatGoCode([]byte(value))
-	if err != nil {
-		panic(err)
-	}
-
-	filename := file.GeneratedFilenamePrefix + "_kvstore.pb.go"
-	g := gen.NewGeneratedFile(filename, file.GoImportPath)
-	_, err = g.Write(fmtValue)
-	if err != nil {
-		fmt.Printf("%s\n", err)
-		return
-	}
-
-	return
+	return templatePairs
 }
 
 func protoKindToGoType(k protoreflect.Kind) string {
@@ -98,19 +106,22 @@ func protoKindToGoType(k protoreflect.Kind) string {
 	case protoreflect.Uint64Kind:
 		return "uint64"
 	default:
+		//nolint:godox
 		// TODO: Handle all proto types
 		return ""
 	}
 }
 
 func formatGoCode(code []byte) ([]byte, error) {
-	formatted, err := format.Source([]byte(code))
+	formatted, err := format.Source(code)
 	if err != nil {
 		return []byte{}, err
 	}
 
+	//nolint:gomnd
 	options := &imports.Options{Comments: true, TabIndent: true, TabWidth: 8}
 	formatted, err = imports.Process("", formatted, options)
+
 	if err != nil {
 		return []byte{}, err
 	}

cmd/protoc-gen-go-kvstore/internal/generators/template.go

@@ -19,10 +19,16 @@ var rawTemplate string
 
 var funcs = template.FuncMap{
 	"funcCallArgs": func(varName string, v interface{}) string {
-		vv := v.([]string)
+		vv, ok := v.([]string)
+
+		if !ok {
+			return ""
+		}
+
 		vv = lo.Map(vv, func(item string, _ int) string {
 			return fmt.Sprintf("%s.%s", varName, item)
 		})
+
 		return strings.Join(vv, ", ")
 	},
 }
@@ -65,6 +71,7 @@ func Render(templateContext kvstoreTemplateContext) (string, error) {
 
 	builder := &bytes.Buffer{}
 	err := tmpl.Execute(builder, templateContext)
+
 	if err != nil {
 		return "", err
 	}