feat: enhance CQRS implementation with generic request and response t…

…ypes, add new error for invalid request response, and introduce Query interface

.golangci.yml

@@ -0,0 +1,315 @@
+## Golden config for golangci-lint v1.61.0
+
+run:
+  # Timeout for analysis, e.g. 30s, 5m.
+  # Default: 1m
+  timeout: 3m
+
+# This file contains only configs which differ from defaults.
+# All possible options can be found here https://github.com/golangci/golangci-lint/blob/master/.golangci.reference.yml
+linters-settings:
+  cyclop:
+    # The maximal code complexity to report.
+    # Default: 10
+    max-complexity: 30
+    # The maximal average package complexity.
+    # If it's higher than 0.0 (float) the check is enabled
+    # Default: 0.0
+    package-average: 10.0
+
+  errcheck:
+    # Report about not checking of errors in type assertions: `a := b.(MyStruct)`.
+    # Such cases aren't reported by default.
+    # Default: false
+    check-type-assertions: true
+
+  exhaustive:
+    # Program elements to check for exhaustiveness.
+    # Default: [ switch ]
+    check:
+      - switch
+      - map
+
+  exhaustruct:
+    # List of regular expressions to exclude struct packages and their names from checks.
+    # Regular expressions must match complete canonical struct package/name/structname.
+    # Default: []
+    exclude:
+      # std libs
+      - "^net/http.Client$"
+      - "^net/http.Cookie$"
+      - "^net/http.Request$"
+      - "^net/http.Response$"
+      - "^net/http.Server$"
+      - "^net/http.Transport$"
+      - "^net/url.URL$"
+      - "^os/exec.Cmd$"
+      - "^reflect.StructField$"
+      # public libs
+      - "^github.com/Shopify/sarama.Config$"
+      - "^github.com/Shopify/sarama.ProducerMessage$"
+      - "^github.com/mitchellh/mapstructure.DecoderConfig$"
+      - "^github.com/prometheus/client_golang/.+Opts$"
+      - "^github.com/spf13/cobra.Command$"
+      - "^github.com/spf13/cobra.CompletionOptions$"
+      - "^github.com/stretchr/testify/mock.Mock$"
+      - "^github.com/testcontainers/testcontainers-go.+Request$"
+      - "^github.com/testcontainers/testcontainers-go.FromDockerfile$"
+      - "^golang.org/x/tools/go/analysis.Analyzer$"
+      - "^google.golang.org/protobuf/.+Options$"
+      - "^gopkg.in/yaml.v3.Node$"
+
+  funlen:
+    # Checks the number of lines in a function.
+    # If lower than 0, disable the check.
+    # Default: 60
+    lines: 100
+    # Checks the number of statements in a function.
+    # If lower than 0, disable the check.
+    # Default: 40
+    statements: 50
+    # Ignore comments when counting lines.
+    # Default false
+    ignore-comments: true
+
+  gocognit:
+    # Minimal code complexity to report.
+    # Default: 30 (but we recommend 10-20)
+    min-complexity: 20
+
+  gocritic:
+    # Settings passed to gocritic.
+    # The settings key is the name of a supported gocritic checker.
+    # The list of supported checkers can be find in https://go-critic.github.io/overview.
+    settings:
+      captLocal:
+        # Whether to restrict checker to params only.
+        # Default: true
+        paramsOnly: false
+      underef:
+        # Whether to skip (*x).method() calls where x is a pointer receiver.
+        # Default: true
+        skipRecvDeref: false
+
+  gomodguard:
+    blocked:
+      # List of blocked modules.
+      # Default: []
+      modules:
+        - github.com/golang/protobuf:
+            recommendations:
+              - google.golang.org/protobuf
+            reason: "see https://developers.google.com/protocol-buffers/docs/reference/go/faq#modules"
+        - github.com/satori/go.uuid:
+            recommendations:
+              - github.com/google/uuid
+            reason: "satori's package is not maintained"
+        - github.com/gofrs/uuid:
+            recommendations:
+              - github.com/gofrs/uuid/v5
+            reason: "gofrs' package was not go module before v5"
+
+  govet:
+    # Enable all analyzers.
+    # Default: false
+    enable-all: true
+    # Disable analyzers by name.
+    # Run `go tool vet help` to see all analyzers.
+    # Default: []
+    disable:
+      - fieldalignment # too strict
+    # Settings per analyzer.
+    settings:
+      shadow:
+        # Whether to be strict about shadowing; can be noisy.
+        # Default: false
+        strict: true
+
+  inamedparam:
+    # Skips check for interface methods with only a single parameter.
+    # Default: false
+    skip-single-param: true
+
+  mnd:
+    # List of function patterns to exclude from analysis.
+    # Values always ignored: `time.Date`,
+    # `strconv.FormatInt`, `strconv.FormatUint`, `strconv.FormatFloat`,
+    # `strconv.ParseInt`, `strconv.ParseUint`, `strconv.ParseFloat`.
+    # Default: []
+    ignored-functions:
+      - args.Error
+      - flag.Arg
+      - flag.Duration.*
+      - flag.Float.*
+      - flag.Int.*
+      - flag.Uint.*
+      - os.Chmod
+      - os.Mkdir.*
+      - os.OpenFile
+      - os.WriteFile
+      - prometheus.ExponentialBuckets.*
+      - prometheus.LinearBuckets
+
+  nakedret:
+    # Make an issue if func has more lines of code than this setting, and it has naked returns.
+    # Default: 30
+    max-func-lines: 0
+
+  nolintlint:
+    # Exclude following linters from requiring an explanation.
+    # Default: []
+    allow-no-explanation: [funlen, gocognit, lll]
+    # Enable to require an explanation of nonzero length after each nolint directive.
+    # Default: false
+    require-explanation: true
+    # Enable to require nolint directives to mention the specific linter being suppressed.
+    # Default: false
+    require-specific: true
+
+  perfsprint:
+    # Optimizes into strings concatenation.
+    # Default: true
+    strconcat: false
+
+  rowserrcheck:
+    # database/sql is always checked
+    # Default: []
+    packages:
+      - github.com/jmoiron/sqlx
+
+  sloglint:
+    # Enforce not using global loggers.
+    # Values:
+    # - "": disabled
+    # - "all": report all global loggers
+    # - "default": report only the default slog logger
+    # https://github.com/go-simpler/sloglint?tab=readme-ov-file#no-global
+    # Default: ""
+    no-global: "all"
+    # Enforce using methods that accept a context.
+    # Values:
+    # - "": disabled
+    # - "all": report all contextless calls
+    # - "scope": report only if a context exists in the scope of the outermost function
+    # https://github.com/go-simpler/sloglint?tab=readme-ov-file#context-only
+    # Default: ""
+    context: "scope"
+
+  tenv:
+    # The option `all` will run against whole test files (`_test.go`) regardless of method/function signatures.
+    # Otherwise, only methods that take `*testing.T`, `*testing.B`, and `testing.TB` as arguments are checked.
+    # Default: false
+    all: true
+
+linters:
+  disable-all: true
+  enable:
+    ## enabled by default
+    - errcheck # checking for unchecked errors, these unchecked errors can be critical bugs in some cases
+    - gosimple # specializes in simplifying a code
+    - govet # reports suspicious constructs, such as Printf calls whose arguments do not align with the format string
+    - ineffassign # detects when assignments to existing variables are not used
+    - staticcheck # is a go vet on steroids, applying a ton of static analysis checks
+    - typecheck # like the front-end of a Go compiler, parses and type-checks Go code
+    - unused # checks for unused constants, variables, functions and types
+    ## disabled by default
+    - asasalint # checks for pass []any as any in variadic func(...any)
+    - asciicheck # checks that your code does not contain non-ASCII identifiers
+    - bidichk # checks for dangerous unicode character sequences
+    - bodyclose # checks whether HTTP response body is closed successfully
+    - canonicalheader # checks whether net/http.Header uses canonical header
+    - copyloopvar # detects places where loop variables are copied (Go 1.22+)
+    - cyclop # checks function and package cyclomatic complexity
+    - dupl # tool for code clone detection
+    - durationcheck # checks for two durations multiplied together
+    - errname # checks that sentinel errors are prefixed with the Err and error types are suffixed with the Error
+    - errorlint # finds code that will cause problems with the error wrapping scheme introduced in Go 1.13
+    - exhaustive # checks exhaustiveness of enum switch statements
+    - fatcontext # detects nested contexts in loops
+    - forbidigo # forbids identifiers
+    - funlen # tool for detection of long functions
+    - gocheckcompilerdirectives # validates go compiler directive comments (//go:)
+    - gochecknoglobals # checks that no global variables exist
+    - gochecknoinits # checks that no init functions are present in Go code
+    - gochecksumtype # checks exhaustiveness on Go "sum types"
+    - gocognit # computes and checks the cognitive complexity of functions
+    - goconst # finds repeated strings that could be replaced by a constant
+    - gocritic # provides diagnostics that check for bugs, performance and style issues
+    - gocyclo # computes and checks the cyclomatic complexity of functions
+    - godot # checks if comments end in a period
+    - goimports # in addition to fixing imports, goimports also formats your code in the same style as gofmt
+    - gomoddirectives # manages the use of 'replace', 'retract', and 'excludes' directives in go.mod
+    - gomodguard # allow and block lists linter for direct Go module dependencies. This is different from depguard where there are different block types for example version constraints and module recommendations
+    - goprintffuncname # checks that printf-like functions are named with f at the end
+    - gosec # inspects source code for security problems
+    - intrange # finds places where for loops could make use of an integer range
+    - lll # reports long lines
+    - loggercheck # checks key value pairs for common logger libraries (kitlog,klog,logr,zap)
+    - makezero # finds slice declarations with non-zero initial length
+    - mirror # reports wrong mirror patterns of bytes/strings usage
+    - mnd # detects magic numbers
+    - musttag # enforces field tags in (un)marshaled structs
+    - nakedret # finds naked returns in functions greater than a specified function length
+    - nestif # reports deeply nested if statements
+    - nilerr # finds the code that returns nil even if it checks that the error is not nil
+    - nilnil # checks that there is no simultaneous return of nil error and an invalid value
+    - noctx # finds sending http request without context.Context
+    - nolintlint # reports ill-formed or insufficient nolint directives
+    - nonamedreturns # reports all named returns
+    - nosprintfhostport # checks for misuse of Sprintf to construct a host with port in a URL
+    - perfsprint # checks that fmt.Sprintf can be replaced with a faster alternative
+    - predeclared # finds code that shadows one of Go's predeclared identifiers
+    - promlinter # checks Prometheus metrics naming via promlint
+    - protogetter # reports direct reads from proto message fields when getters should be used
+    - reassign # checks that package variables are not reassigned
+    - revive # fast, configurable, extensible, flexible, and beautiful linter for Go, drop-in replacement of golint
+    - rowserrcheck # checks whether Err of rows is checked successfully
+    - sloglint # ensure consistent code style when using log/slog
+    - spancheck # checks for mistakes with OpenTelemetry/Census spans
+    - sqlclosecheck # checks that sql.Rows and sql.Stmt are closed
+    - stylecheck # is a replacement for golint
+    - tenv # detects using os.Setenv instead of t.Setenv since Go1.17
+    - testableexamples # checks if examples are testable (have an expected output)
+    - testifylint # checks usage of github.com/stretchr/testify
+    - testpackage # makes you use a separate _test package
+    - tparallel # detects inappropriate usage of t.Parallel() method in your Go test codes
+    - unconvert # removes unnecessary type conversions
+    - unparam # reports unused function parameters
+    - usestdlibvars # detects the possibility to use variables/constants from the Go standard library
+    - wastedassign # finds wasted assignment statements
+    - whitespace # detects leading and trailing whitespace
+    - decorder # checks declaration order and count of types, constants, variables and functions
+    - exhaustruct # [highly recommend to enable] checks if all structure fields are initialized
+    - gci # controls golang package import order and makes it always deterministic
+    - interfacebloat # checks the number of methods inside an interface
+    - ireturn # accept interfaces, return concrete types
+    - prealloc # [premature optimization, but can be used in some cases] finds slice declarations that could potentially be preallocated
+    - tagalign # checks that struct tags are well aligned
+    - varnamelen # [great idea, but too many false positives] checks that the length of a variable's name matches its scope
+    - wrapcheck # checks that errors returned from external packages are wrapped
+    - zerologlint # detects the wrong usage of zerolog that a user forgets to dispatch zerolog.Event
+    - containedctx # detects struct contained context.Context field
+    - grouper # analyzes expression groups
+    - tagliatelle # checks the struct tags
+    #- maintidx # measures the maintainability index of each function
+
+issues:
+  # Maximum count of issues with the same text.
+  # Set to 0 to disable.
+  # Default: 3
+  max-same-issues: 50
+
+  exclude-rules:
+    - source: "(noinspection|TODO)"
+      linters: [godot]
+    - source: "//noinspection"
+      linters: [gocritic]
+    - path: "_test\\.go"
+      linters:
+        - bodyclose
+        - dupl
+        - funlen
+        - goconst
+        - gosec
+        - noctx
+        - wrapcheck

aggregate/version.go

@@ -7,10 +7,6 @@ type Version int
 // based on the uncommitted events.
 // If there are no uncommitted events, it returns the current version.
 func UncommittedVersion[ID comparable](agg Aggregate[ID]) int {
-	if len(agg.AggregateChanges()) == 0 {
-		return int(agg.AggregateVersion())
-	}
-
 	changes := agg.AggregateChanges()
 	if len(changes) == 0 {
 		return int(agg.AggregateVersion())

cqrs/bus.go

@@ -7,36 +7,37 @@ import (
 
 const HeaderKey = "cqrs_header"
 
-type bus struct {
+type InMemoryBus struct {
 	handlers    sync.Map
 	middlewares []Middleware
 }
 
-func NewBus() *bus {
-	return &bus{
-		handlers: sync.Map{},
+func NewInMemoryBus() *InMemoryBus {
+	return &InMemoryBus{
+		handlers:    sync.Map{},
+		middlewares: []Middleware{},
 	}
 }
 
-func (b *bus) Close() {
-	b.handlers.Range(func(key, value interface{}) bool {
+func (b *InMemoryBus) Close() {
+	b.handlers.Range(func(key, _ interface{}) bool {
 		b.handlers.Delete(key)
 		return true
 	})
 }
 
-func (b *bus) Exists(name string) bool {
+func (b *InMemoryBus) Exists(name string) bool {
 	_, ok := b.handlers.Load(name)
 	return ok
 }
 
 // Use adds a middleware to all handlers registered in the bus.
-func (b *bus) Use(middleware func(func(context.Context, interface{}) (interface{}, error)) func(context.Context, interface{}) (interface{}, error)) {
+func (b *InMemoryBus) Use(middleware Middleware) {
 	b.middlewares = append(b.middlewares, middleware)
 }
 
 // Dispatch dispatches a request to the bus.
-func (b *bus) Dispatch(
+func (b *InMemoryBus) Dispatch(
 	ctx context.Context,
 	name string,
 	request interface{},
@@ -55,7 +56,7 @@ func (b *bus) Dispatch(
 	return h(ctx, request)
 }
 
-func (b *bus) RegisterHandler(
+func (b *InMemoryBus) RegisterHandler(
 	ctx context.Context,
 	name string,
 	handler HandlerFuncAny,
@@ -75,6 +76,6 @@ func (b *bus) RegisterHandler(
 	return nil
 }
 
-func (b *bus) UnregisterHandler(ctx context.Context, name string) {
+func (b *InMemoryBus) UnregisterHandler(ctx context.Context, name string) {
 	b.handlers.Delete(name)
 }