feat: add precise diagnostics and optional client copy logging controls

examples/developerTools/README.md

@@ -0,0 +1,18 @@
+# 配置诊断、严格 HTTP 状态、类型预检和日志时区
+
+在框架根目录运行，不需要数据库、账号或外部服务。HTTP 示例只访问临时 localhost 服务：
+
+```sh
+go run ./examples/developerTools
+DEMO_LOG_TIME_ZONE=UTC go run ./examples/developerTools
+# 以下两条应非零退出，输出具体字段和环境变量名，不输出原值：
+DEMO_DB_PORT=70000 go run ./examples/developerTools
+DEMO_LOG_LEVEL=invalid go run ./examples/developerTools
+```
+
+- 配置只做校验，没有连接数据库。失败指向 `database.port` / `server.log.level`，并保留文件行列与变量名。
+- Logger 使用选定时区；只改变记录的时间戳，不修改全局 time.Local 和业务时间字段。
+- `copyx.Check[Input, Result]` 发现切片元素内的不兼容字段；加上显式 `strconv.Atoi` converter 后通过。预检不执行 converter，真实非法数字仍在 Copy 时返回错误。
+- JSON 调用显式 `WithSuccessStatuses(200)`，拒绝 201，框架仍负责关闭响应体。
+
+详见 [配置](../../CONFIG.md)、[日志](../../logx/README.md)、[HTTP 客户端](../../httpc/README.md)、[copyx](../../COPY.md)。

examples/developerTools/config.yaml

@@ -0,0 +1,7 @@
+# Validates database settings without connecting in this demonstration.
+database:
+  port: "${DEMO_DB_PORT:-3306}"
+server:
+  log:
+    level: "${DEMO_LOG_LEVEL:-info}"
+    timeZone: "${DEMO_LOG_TIME_ZONE:-Asia/Shanghai}"

examples/developerTools/main.go

@@ -0,0 +1,104 @@
+// Run from the framework root with: go run ./examples/developerTools
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strconv"
+	_ "time/tzdata" // This example embeds zones; production builds can use -tags timetzdata.
+
+	"git.yuntuo.hk/k2safe/go-omni/config"
+	"git.yuntuo.hk/k2safe/go-omni/copyx"
+	mysql "git.yuntuo.hk/k2safe/go-omni/database/mysql"
+	"git.yuntuo.hk/k2safe/go-omni/httpc"
+	"git.yuntuo.hk/k2safe/go-omni/logx"
+)
+
+type Config struct {
+	Database mysql.Config  `json:"database"`
+	Server   config.Config `json:"server"`
+}
+
+func Default() Config {
+	c := config.Default()
+	c.Log.Output = "stdout"
+	return Config{Database: mysql.DefaultConfig(), Server: c}
+}
+func (c Config) Validate() error {
+	if err := c.Database.Validate(); err != nil {
+		return config.AtField("database", err)
+	}
+	return config.AtField("server", c.Server.Validate())
+}
+
+type Input struct{ Values []TextValue }
+type TextValue struct{ Number string }
+type Result struct{ Values []NumberValue }
+type NumberValue struct{ Number int }
+
+func run(path string) error {
+	cfg, err := config.LoadProject(path, Default())
+	if err != nil {
+		return err
+	}
+	// Validation only: this example never opens a database.
+	logger, err := logx.New(cfg.Server.Log)
+	if err != nil {
+		return err
+	}
+	defer logger.Close()
+	logger.InfoContext(context.Background(), "instance time zone", "configuredZone", cfg.Server.Log.TimeZone)
+	if err := copyx.Check[Input, Result](); !errors.Is(err, copyx.ErrType) {
+		return fmt.Errorf("expected a type mismatch, got %v", err)
+	}
+	// Explicit Go converter owns the number conversion; no JSON mapping file.
+	options := []copyx.Option{copyx.WithConverter(strconv.Atoi)}
+	if err := copyx.Check[Input, Result](options...); err != nil {
+		return err
+	}
+	var output Result
+	if err := copyx.Copy(&output, Input{Values: []TextValue{{Number: "42"}}}, options...); err != nil {
+		return err
+	}
+	fmt.Printf("type check and copy succeeded: %d\n", output.Values[0].Number)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/created" {
+			w.WriteHeader(http.StatusCreated)
+		}
+		io.WriteString(w, `{"value":"example"}`)
+	}))
+	defer server.Close()
+	client, err := httpc.New(httpc.Config{DisableLogging: true})
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+	var reply struct {
+		Value string `json:"value"`
+	}
+	if err := client.JSON(context.Background(), http.MethodGet, server.URL, nil, &reply, httpc.WithSuccessStatuses(http.StatusOK)); err != nil {
+		return err
+	}
+	err = client.JSON(context.Background(), http.MethodGet, server.URL+"/created", nil, &reply, httpc.WithSuccessStatuses(http.StatusOK))
+	var status *httpc.StatusError
+	if !errors.As(err, &status) || status.StatusCode != http.StatusCreated {
+		return fmt.Errorf("expected status rejection, got %v", err)
+	}
+	fmt.Println("strict JSON: 200 accepted, 201 rejected")
+	return nil
+}
+func main() {
+	path := flag.String("config", "examples/developerTools/config.yaml", "selected configuration file")
+	flag.Parse()
+	if err := run(*path); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}

examples/managedService/go.mod

@@ -2,7 +2,7 @@ module example.com/managed
 
 go 1.22.0
 
-require git.yuntuo.hk/k2safe/go-omni v0.22.0-preview
+require git.yuntuo.hk/k2safe/go-omni v0.23.0-preview
 
 require (
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect

examples/userService/go.mod

@@ -3,7 +3,7 @@ module example.com/userService
 go 1.22.0
 
 require (
-	git.yuntuo.hk/k2safe/go-omni v0.22.0-preview
+	git.yuntuo.hk/k2safe/go-omni v0.23.0-preview
 	github.com/go-sql-driver/mysql v1.9.3
 )