138 lines
4.3 KiB
Go
138 lines
4.3 KiB
Go
package backendstatus
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"yms-daemon/internal/daemonapi"
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"yms-daemon/internal/deploymentconfig"
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"yms-daemon/internal/systemd"
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)
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// 诊断项稳定标识，供测试与 reconcile 识别，不参与展示。
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const (
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codeNativeActivePortOK = "native_nginx_active_port"
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codeNativeActiveUnitOK = "native_active_unit_running"
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codeNativeActiveUnitDown = "native_active_unit_not_running"
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codeNativeInactiveUnitOK = "native_inactive_unit_stopped"
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codeNativeInactiveRunning = "native_inactive_unit_running"
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codeNativeSlotJAROK = "native_slot_jar_link"
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codeNativeSlotJARDrift = "native_slot_jar_link_drift"
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)
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// diagnoseNative 对 native 后端做只读诊断。
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// native 没有部署单例记录，事实来源是宿主 Nginx 活动端口与 systemd 单元现场状态。
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func (d *Diagnoser) diagnoseNative(ctx context.Context) (daemonapi.Diagnosis, error) {
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findings, err := d.nativeGather(ctx)
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if err != nil {
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return daemonapi.Diagnosis{}, err
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}
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return toDiagnosis("backend", deploymentconfig.BackendTypeNative, findings), nil
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}
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// nativeGather 生成 native 后端的全部诊断项。
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func (d *Diagnoser) nativeGather(ctx context.Context) ([]finding, error) {
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before, err := d.gateway.Read()
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if err != nil {
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return nil, fmt.Errorf("read host Nginx configuration: %w", err)
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}
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activePort := before.ActivePort
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findings := make([]finding, 0, 6)
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findings = append(findings, finding{
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level: daemonapi.DiagnosisLevelOK,
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code: codeNativeActivePortOK,
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message: fmt.Sprintf("宿主 Nginx 指向后端端口 %d", activePort),
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})
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activeSlot, err := d.config.Backend.SlotForPort(activePort)
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if err != nil {
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return nil, err
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}
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inactiveSlot, err := d.config.Backend.SlotForPort(otherPort(activePort))
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if err != nil {
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return nil, err
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}
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activeUnit, err := d.units.Inspect(ctx, activeSlot.Unit)
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if err != nil {
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return nil, fmt.Errorf("inspect native active unit %s: %w", activeSlot.Unit, err)
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}
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if unitRunning(activeUnit) {
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findings = append(findings, finding{
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level: daemonapi.DiagnosisLevelOK,
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code: codeNativeActiveUnitOK,
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message: "活动单元 " + activeSlot.Unit + " 正在运行",
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})
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} else {
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findings = append(findings, finding{
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level: daemonapi.DiagnosisLevelDrift,
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code: codeNativeActiveUnitDown,
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message: "活动单元 " + activeSlot.Unit + " 未运行（ActiveState=" + activeUnit.ActiveState + "）",
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})
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}
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inactiveUnit, err := d.units.Inspect(ctx, inactiveSlot.Unit)
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if err != nil {
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return nil, fmt.Errorf("inspect native inactive unit %s: %w", inactiveSlot.Unit, err)
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}
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if unitRunning(inactiveUnit) {
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findings = append(findings, finding{
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level: daemonapi.DiagnosisLevelDrift,
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code: codeNativeInactiveRunning,
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message: "非活动单元 " + inactiveSlot.Unit + " 意外运行，两个槽位同时在线",
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})
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} else {
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findings = append(findings, finding{
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level: daemonapi.DiagnosisLevelOK,
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code: codeNativeInactiveUnitOK,
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message: "非活动单元 " + inactiveSlot.Unit + " 已停止",
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})
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}
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if ok, detail := jarLinkStatus(activeSlot.JAR); ok {
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findings = append(findings, finding{
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level: daemonapi.DiagnosisLevelOK,
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code: codeNativeSlotJAROK,
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message: "活动槽位 JAR 链接有效：" + detail,
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})
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} else {
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findings = append(findings, finding{
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level: daemonapi.DiagnosisLevelDrift,
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code: codeNativeSlotJARDrift,
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message: "活动槽位 JAR 链接异常：" + detail,
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})
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}
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return findings, nil
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}
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// unitRunning 判断 systemd 单元是否处于运行状态。
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func unitRunning(unit systemd.Unit) bool {
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return unit.ActiveState != "inactive" && unit.ActiveState != "failed"
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}
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// jarLinkStatus 检查槽位 JAR 路径是否为指向现存文件的符号链接。
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// 返回 ok 与人类可读的详情；JAR 缺失、不是符号链接或目标不存在时返回 ok=false。
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func jarLinkStatus(path string) (bool, string) {
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info, err := os.Lstat(path)
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if errors.Is(err, os.ErrNotExist) {
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return false, "路径不存在"
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}
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if err != nil {
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return false, "检查失败：" + err.Error()
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}
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if info.Mode()&os.ModeSymlink == 0 {
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return false, "不是符号链接"
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}
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target, err := os.Readlink(path)
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if err != nil {
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return false, "读取链接目标失败：" + err.Error()
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}
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if _, err := os.Stat(path); err != nil {
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return false, "链接目标不存在：" + target
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}
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return true, "指向 " + target
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}
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