feat(logging): added in db and logging with websocket

This commit is contained in:
2025-07-22 19:59:06 -05:00
parent 623e19f028
commit 52ef39fd5c
9 changed files with 555 additions and 96 deletions

View File

@@ -1,65 +1,149 @@
using System.Net;
using System.Net.WebSockets;
using System.Text;
var builder = WebApplication.CreateBuilder(args);
// Configure clients
builder.Services.AddHttpClient("GoBackend", client => {
builder.Services.AddHttpClient("GoBackend", client =>
{
client.BaseAddress = new Uri("http://localhost:8080");
});
var app = builder.Build();
// Handle trailing slash redirects
app.Use(async (context, next) => {
if (context.Request.Path.Equals("/lst", StringComparison.OrdinalIgnoreCase)) {
context.Response.Redirect("/lst/", permanent: true);
// Enable WebSocket support
app.UseWebSockets();
app.Use(async (context, next) =>
{
// Proxy WebSocket requests for /lst/api/logger/logs (adjust path as needed)
if (context.WebSockets.IsWebSocketRequest &&
context.Request.Path.StartsWithSegments("/lst/api/logger/logs"))
{
try
{
var backendUri = new UriBuilder("ws", "localhost", 8080)
{
Path = context.Request.Path,
Query = context.Request.QueryString.ToString()
}.Uri;
using var backendSocket = new ClientWebSocket();
// Forward most headers except those managed by WebSocket protocol
foreach (var header in context.Request.Headers)
{
if (!header.Key.Equals("Host", StringComparison.OrdinalIgnoreCase) &&
!header.Key.Equals("Upgrade", StringComparison.OrdinalIgnoreCase) &&
!header.Key.Equals("Connection", StringComparison.OrdinalIgnoreCase) &&
!header.Key.Equals("Sec-WebSocket-Key", StringComparison.OrdinalIgnoreCase) &&
!header.Key.Equals("Sec-WebSocket-Version", StringComparison.OrdinalIgnoreCase))
{
backendSocket.Options.SetRequestHeader(header.Key, header.Value);
}
}
await backendSocket.ConnectAsync(backendUri, context.RequestAborted);
using var frontendSocket = await context.WebSockets.AcceptWebSocketAsync();
var cts = new CancellationTokenSource();
// Bidirectional forwarding tasks
var forwardToBackend = ForwardWebSocketAsync(frontendSocket, backendSocket, cts.Token);
var forwardToFrontend = ForwardWebSocketAsync(backendSocket, frontendSocket, cts.Token);
await Task.WhenAny(forwardToBackend, forwardToFrontend);
cts.Cancel();
return;
}
catch (Exception ex)
{
context.Response.StatusCode = (int)HttpStatusCode.BadGateway;
await context.Response.WriteAsync($"WebSocket proxy error: {ex.Message}");
return;
}
}
await next();
});
// Proxy all requests to Go backend
app.Use(async (context, next) => {
// Skip special paths
if (context.Request.Path.StartsWithSegments("/.well-known")) {
// Proxy normal HTTP requests
app.Use(async (context, next) =>
{
if (context.WebSockets.IsWebSocketRequest)
{
await next();
return;
}
var client = context.RequestServices.GetRequiredService<IHttpClientFactory>()
.CreateClient("GoBackend");
var client = context.RequestServices.GetRequiredService<IHttpClientFactory>().CreateClient("GoBackend");
try {
var request = new HttpRequestMessage(
new HttpMethod(context.Request.Method),
try
{
var request = new HttpRequestMessage(new HttpMethod(context.Request.Method),
context.Request.Path + context.Request.QueryString);
// Copy headers
foreach (var header in context.Request.Headers) {
if (!request.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray())) {
foreach (var header in context.Request.Headers)
{
if (!request.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray()))
{
request.Content ??= new StreamContent(context.Request.Body);
request.Content.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray());
}
}
if (context.Request.ContentLength > 0) {
if (context.Request.ContentLength > 0 && request.Content == null)
{
request.Content = new StreamContent(context.Request.Body);
}
var response = await client.SendAsync(request);
var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, context.RequestAborted);
context.Response.StatusCode = (int)response.StatusCode;
foreach (var header in response.Headers) {
foreach (var header in response.Headers)
{
context.Response.Headers[header.Key] = header.Value.ToArray();
}
foreach (var header in response.Content.Headers)
{
context.Response.Headers[header.Key] = header.Value.ToArray();
}
if (response.Content.Headers.ContentType != null) {
context.Response.ContentType = response.Content.Headers.ContentType.ToString();
}
context.Response.Headers.Remove("transfer-encoding");
await response.Content.CopyToAsync(context.Response.Body);
}
catch (HttpRequestException) {
context.Response.StatusCode = 502;
catch (HttpRequestException ex)
{
context.Response.StatusCode = (int)HttpStatusCode.BadGateway;
await context.Response.WriteAsync($"Backend request failed: {ex.Message}");
}
});
async Task ForwardWebSocketAsync(WebSocket source, WebSocket destination, CancellationToken cancellationToken)
{
var buffer = new byte[4 * 1024];
try
{
while (source.State == WebSocketState.Open &&
destination.State == WebSocketState.Open &&
!cancellationToken.IsCancellationRequested)
{
var result = await source.ReceiveAsync(new ArraySegment<byte>(buffer), cancellationToken);
if (result.MessageType == WebSocketMessageType.Close)
{
await destination.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "Closing", cancellationToken);
break;
}
await destination.SendAsync(new ArraySegment<byte>(buffer, 0, result.Count), result.MessageType, result.EndOfMessage, cancellationToken);
}
}
catch (WebSocketException)
{
// Normal close or network error
}
}
app.Run();

View File

@@ -1,36 +1,20 @@
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.webServer>
<!-- Enable WebSockets -->
<webSocket enabled="true" receiveBufferLimit="4194304" pingInterval="00:01:00" />
<rewrite>
<rules>
<!-- Redirect root to /lst/ -->
<rule name="Root Redirect" stopProcessing="true">
<match url="^$" />
<action type="Redirect" url="/lst/" redirectType="Permanent" />
</rule>
<!-- Proxy static assets -->
<rule name="Static Assets" stopProcessing="true">
<match url="^lst/assets/(.*)" />
<action type="Rewrite" url="http://localhost:8080/lst/assets/{R:1}" />
</rule>
<!-- Proxy API requests -->
<rule name="API Routes" stopProcessing="true">
<match url="^lst/api/(.*)" />
<action type="Rewrite" url="http://localhost:8080/lst/api/{R:1}" />
</rule>
<!-- Proxy all other requests -->
<rule name="Frontend Routes" stopProcessing="true">
<!-- Proxy all requests starting with /lst/ to the .NET wrapper (port 4000) -->
<rule name="Proxy to Wrapper" stopProcessing="true">
<match url="^lst/(.*)" />
<action type="Rewrite" url="http://localhost:8080/lst/{R:1}" />
<action type="Rewrite" url="http://localhost:8080/{R:1}" />
</rule>
</rules>
</rewrite>
<staticContent>
<clear />
<mimeMap fileExtension=".js" mimeType="application/javascript" />
<mimeMap fileExtension=".mjs" mimeType="application/javascript" />
<mimeMap fileExtension=".css" mimeType="text/css" />
@@ -38,6 +22,8 @@
</staticContent>
<handlers>
<!-- Let AspNetCoreModule handle all requests -->
<remove name="WebSocketHandler" />
<add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
</handlers>

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@@ -0,0 +1,111 @@
package logging
import (
"encoding/json"
"fmt"
"os"
"strings"
"time"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"lst.net/utils/db"
)
type CustomLogger struct {
consoleLogger zerolog.Logger
}
// New creates a configured CustomLogger.
func New() *CustomLogger {
// Colorized console output
consoleWriter := zerolog.ConsoleWriter{
Out: os.Stderr,
TimeFormat: "2006-01-02 15:04:05",
}
return &CustomLogger{
consoleLogger: zerolog.New(consoleWriter).
With().
Timestamp().
Logger(),
}
}
func PrettyFormat(level, message string, metadata map[string]interface{}) string {
timestamp := time.Now().Format("2006-01-02 15:04:05")
base := fmt.Sprintf("[%s] %s| Message: %s", strings.ToUpper(level), timestamp, message)
if len(metadata) > 0 {
metaJSON, _ := json.Marshal(metadata)
return fmt.Sprintf("%s | Metadata: %s", base, string(metaJSON))
}
return base
}
func (l *CustomLogger) logToPostgres(level, message, service string, metadata map[string]interface{}) {
err := db.CreateLog(level, message, service, metadata)
if err != nil {
// Fallback to console if DB fails
log.Error().Err(err).Msg("Failed to write log to PostgreSQL")
}
}
// --- Level-Specific Methods ---
func (l *CustomLogger) Info(message, service string, fields map[string]interface{}) {
l.consoleLogger.Info().Fields(fields).Msg(message)
l.logToPostgres("info", message, service, fields)
PostLog(PrettyFormat("info", message, fields)) // Broadcast pretty message
}
func (l *CustomLogger) Warn(message, service string, fields map[string]interface{}) {
l.consoleLogger.Error().Fields(fields).Msg(message)
l.logToPostgres("warn", message, service, fields)
PostLog(PrettyFormat("warn", message, fields)) // Broadcast pretty message
// Custom logic for errors (e.g., alerting)
if len(fields) > 0 {
l.consoleLogger.Warn().Msg("Additional error context captured")
}
}
func (l *CustomLogger) Error(message, service string, fields map[string]interface{}) {
l.consoleLogger.Error().Fields(fields).Msg(message)
l.logToPostgres("error", message, service, fields)
PostLog(PrettyFormat("error", message, fields)) // Broadcast pretty message
// Custom logic for errors (e.g., alerting)
if len(fields) > 0 {
l.consoleLogger.Warn().Msg("Additional error context captured")
}
}
func (l *CustomLogger) Panic(message, service string, fields map[string]interface{}) {
// Log to console (colored, with fields)
l.consoleLogger.Error().
Str("service", service).
Fields(fields).
Msg(message + " (PANIC)") // Explicitly mark as panic
// Log to PostgreSQL (sync to ensure it's saved before crashing)
err := db.CreateLog("panic", message, service, fields) // isCritical=true
if err != nil {
l.consoleLogger.Error().Err(err).Msg("Failed to save panic log to PostgreSQL")
}
// Additional context (optional)
if len(fields) > 0 {
l.consoleLogger.Warn().Msg("Additional panic context captured")
}
panic(message)
}
func (l *CustomLogger) Debug(message, service string, fields map[string]interface{}) {
l.consoleLogger.Debug().Fields(fields).Msg(message)
l.logToPostgres("debug", message, service, fields)
}

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@@ -0,0 +1,12 @@
package logging
import (
"github.com/gin-gonic/gin"
)
func RegisterLoggerRoutes(l *gin.Engine, baseUrl string) {
configGroup := l.Group(baseUrl + "/api/logger")
configGroup.GET("/logs", GetLogs)
}

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@@ -0,0 +1,132 @@
package logging
import (
"fmt"
"log"
"net/http"
"sync"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
)
var (
logChannel = make(chan string, 1000) // Buffered channel for new logs
wsClients = make(map[*websocket.Conn]bool)
wsClientsMux sync.Mutex
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
fmt.Println("Origin:", r.Header.Get("Origin"))
return true
},
}
// PostLog sends a new log to all connected SSE clients
func PostLog(message string) {
// Send to SSE channel
select {
case logChannel <- message:
log.Printf("Published to SSE: %s", message)
default:
log.Printf("DROPPED SSE message (channel full): %s", message)
}
wsClientsMux.Lock()
defer wsClientsMux.Unlock()
for client := range wsClients {
err := client.WriteMessage(websocket.TextMessage, []byte(message))
if err != nil {
client.Close()
delete(wsClients, client)
}
}
}
func GetLogs(c *gin.Context) {
// Check if it's a WebSocket request
if websocket.IsWebSocketUpgrade(c.Request) {
handleWebSocket(c)
return
}
// Otherwise, handle as SSE
handleSSE(c)
}
func handleSSE(c *gin.Context) {
log := New()
log.Info("SSE connection established", "logger", map[string]interface{}{
"endpoint": "/api/logger/logs",
"client_ip": c.ClientIP(),
"user_agent": c.Request.UserAgent(),
})
c.Header("Content-Type", "text/event-stream")
c.Header("Cache-Control", "no-cache")
c.Header("Connection", "keep-alive")
flusher, ok := c.Writer.(http.Flusher)
if !ok {
log.Info("SSE not supported", "logger", nil)
c.AbortWithStatus(http.StatusInternalServerError)
return
}
notify := c.Writer.CloseNotify()
for {
select {
case <-notify:
log.Info("SSE client disconnected", "logger", nil)
return
case message := <-logChannel:
fmt.Fprintf(c.Writer, "data: %s\n\n", message)
flusher.Flush()
}
}
}
func handleWebSocket(c *gin.Context) {
log := New()
conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
log.Error("WebSocket upgrade failed", "logger", map[string]interface{}{
"error": err.Error(),
})
return
}
// Register client
wsClientsMux.Lock()
wsClients[conn] = true
wsClientsMux.Unlock()
defer func() {
wsClientsMux.Lock()
delete(wsClients, conn)
wsClientsMux.Unlock()
conn.Close()
log.Info("WebSocket client disconnected", "logger", map[string]interface{}{})
}()
// Keep connection alive (or optionally echo, or wait for pings)
for {
// Can just read to keep the connection alive
if _, _, err := conn.NextReader(); err != nil {
break
}
}
}
// func sendRecentLogs(conn *websocket.Conn) {
// // Implement your logic to get recent logs from DB or buffer
// recentLogs := getLast20Logs()
// for _, log := range recentLogs {
// conn.WriteMessage(websocket.TextMessage, []byte(log))
// }
// }

View File

@@ -3,35 +3,57 @@ module lst.net
go 1.24.3
require (
github.com/gin-contrib/cors v1.7.6
github.com/gin-gonic/gin v1.10.1
github.com/gorilla/websocket v1.5.3
github.com/joho/godotenv v1.5.1
github.com/rs/zerolog v1.34.0
github.com/swaggo/swag v1.16.5
gorm.io/driver/postgres v1.6.0
gorm.io/gorm v1.30.0
)
require (
github.com/bytedance/sonic v1.11.6 // indirect
github.com/bytedance/sonic/loader v0.1.1 // indirect
github.com/cloudwego/base64x v0.1.4 // indirect
github.com/cloudwego/iasm v0.2.0 // indirect
github.com/gabriel-vasile/mimetype v1.4.3 // indirect
github.com/gin-contrib/sse v0.1.0 // indirect
github.com/KyleBanks/depth v1.2.1 // indirect
github.com/bytedance/sonic v1.13.3 // indirect
github.com/bytedance/sonic/loader v0.3.0 // indirect
github.com/cloudwego/base64x v0.1.5 // indirect
github.com/gabriel-vasile/mimetype v1.4.9 // indirect
github.com/gin-contrib/sse v1.1.0 // indirect
github.com/go-openapi/jsonpointer v0.21.1 // indirect
github.com/go-openapi/jsonreference v0.21.0 // indirect
github.com/go-openapi/spec v0.21.0 // indirect
github.com/go-openapi/swag v0.23.1 // indirect
github.com/go-playground/locales v0.14.1 // indirect
github.com/go-playground/universal-translator v0.18.1 // indirect
github.com/go-playground/validator/v10 v10.20.0 // indirect
github.com/goccy/go-json v0.10.2 // indirect
github.com/go-playground/validator/v10 v10.27.0 // indirect
github.com/goccy/go-json v0.10.5 // indirect
github.com/jackc/pgpassfile v1.0.0 // indirect
github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
github.com/jackc/pgx/v5 v5.7.5 // indirect
github.com/jackc/puddle/v2 v2.2.2 // indirect
github.com/jinzhu/inflection v1.0.0 // indirect
github.com/jinzhu/now v1.1.5 // indirect
github.com/josharian/intern v1.0.0 // indirect
github.com/json-iterator/go v1.1.12 // indirect
github.com/klauspost/cpuid/v2 v2.2.7 // indirect
github.com/klauspost/cpuid/v2 v2.3.0 // indirect
github.com/leodido/go-urn v1.4.0 // indirect
github.com/mailru/easyjson v0.9.0 // indirect
github.com/mattn/go-colorable v0.1.14 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
github.com/modern-go/reflect2 v1.0.2 // indirect
github.com/pelletier/go-toml/v2 v2.2.2 // indirect
github.com/pelletier/go-toml/v2 v2.2.4 // indirect
github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
github.com/ugorji/go/codec v1.2.12 // indirect
golang.org/x/arch v0.8.0 // indirect
golang.org/x/crypto v0.23.0 // indirect
golang.org/x/net v0.25.0 // indirect
golang.org/x/sys v0.20.0 // indirect
golang.org/x/text v0.15.0 // indirect
google.golang.org/protobuf v1.34.1 // indirect
github.com/ugorji/go/codec v1.3.0 // indirect
golang.org/x/arch v0.19.0 // indirect
golang.org/x/crypto v0.40.0 // indirect
golang.org/x/mod v0.26.0 // indirect
golang.org/x/net v0.42.0 // indirect
golang.org/x/sync v0.16.0 // indirect
golang.org/x/sys v0.34.0 // indirect
golang.org/x/text v0.27.0 // indirect
golang.org/x/tools v0.35.0 // indirect
google.golang.org/protobuf v1.36.6 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)

View File

@@ -1,24 +1,63 @@
// @title My Awesome API
// @version 1.0
// @description This is a sample server for a pet store.
// @termsOfService http://swagger.io/terms/
// @contact.name API Support
// @contact.url http://www.swagger.io/support
// @contact.email support@swagger.io
// @license.name Apache 2.0
// @license.url http://www.apache.org/licenses/LICENSE-2.0.html
// @host localhost:8080
// @BasePath /api/v1
package main
import (
"errors"
"fmt"
"log"
"net/http"
"os"
"github.com/gin-contrib/cors"
"github.com/gin-gonic/gin"
"github.com/joho/godotenv"
"lst.net/cmd/services/logging"
_ "lst.net/docs"
"lst.net/utils/db"
)
func main() {
log := logging.New()
// Load .env only in dev (not Docker/production)
if os.Getenv("RUNNING_IN_DOCKER") != "true" {
err := godotenv.Load("../.env")
if err != nil {
log.Println("Warning: .env file not found (ok in Docker/production)")
log.Info("Warning: .env file not found (ok in Docker/production)", "system", map[string]interface{}{})
}
}
// Initialize DB
if err := db.InitDB(); err != nil {
log.Panic("Database intialize failed", "db", map[string]interface{}{
"error": err.Error(),
"casue": errors.Unwrap(err),
"timeout": "30s",
"details": fmt.Sprintf("%+v", err), // Full stack trace if available
})
}
defer func() {
if r := recover(); r != nil {
sqlDB, _ := db.DB.DB()
sqlDB.Close()
log.Error("Recovered from panic during DB shutdown", "db", map[string]interface{}{
"panic": r,
})
}
}()
// Set basePath dynamically
basePath := "/"
@@ -34,6 +73,16 @@ func main() {
gin.SetMode(gin.ReleaseMode)
}
// Enable CORS (adjust origins as needed)
r.Use(cors.New(cors.Config{
AllowOrigins: []string{"*"}, // Allow all origins (change in production)
AllowMethods: []string{"GET", "OPTIONS", "POST", "DELETE", "PATCH", "CONNECT"},
AllowHeaders: []string{"Origin", "Cache-Control", "Content-Type"},
ExposeHeaders: []string{"Content-Length"},
AllowCredentials: true,
AllowWebSockets: true,
}))
// // --- Add Redirects Here ---
// // Redirect root ("/") to "/app" or "/lst/app"
// r.GET("/", func(c *gin.Context) {
@@ -52,34 +101,18 @@ func main() {
r.StaticFS(basePath+"/app", http.Dir("frontend"))
r.GET(basePath+"/api/ping", func(c *gin.Context) {
log.Info("Checking if the server is up", "system", map[string]interface{}{
"endpoint": "/api/ping",
"client_ip": c.ClientIP(),
"user_agent": c.Request.UserAgent(),
})
c.JSON(200, gin.H{"message": "pong"})
})
logging.RegisterLoggerRoutes(r, basePath)
r.Any(basePath+"/api", errorApiLoc)
// // Serve static assets for Vite app
// r.Static("/lst/app/assets", "./dist/app/assets")
// // Catch-all for Vite app routes
// r.NoRoute(func(c *gin.Context) {
// path := c.Request.URL.Path
// // Don't handle API, assets, or docs
// if strings.HasPrefix(path, "/lst/api") ||
// strings.HasPrefix(path, "/lst/app/assets") ||
// strings.HasPrefix(path, "/lst/docs") {
// c.JSON(404, gin.H{"error": "Not found"})
// return
// }
// // Serve index.html for all /lst/app routes
// if strings.HasPrefix(path, "/lst/app") {
// c.File("./dist/app/index.html")
// return
// }
// c.JSON(404, gin.H{"error": "Not found"})
// })
r.Run(":8080")
}
@@ -93,5 +126,11 @@ func main() {
// c.JSON(http.StatusBadRequest, gin.H{"message": "welcome to lst system you might have just encountered an incorrect area of the app"})
// }
func errorApiLoc(c *gin.Context) {
log := logging.New()
log.Info("Api endpoint hit that dose not exist", "system", map[string]interface{}{
"endpoint": "/api",
"client_ip": c.ClientIP(),
"user_agent": c.Request.UserAgent(),
})
c.JSON(http.StatusBadRequest, gin.H{"message": "looks like you have encountered an api route that dose not exist"})
}

32
backend/utils/db/db.go Normal file
View File

@@ -0,0 +1,32 @@
package db
import (
"fmt"
"os"
"gorm.io/driver/postgres"
"gorm.io/gorm"
)
var DB *gorm.DB
func InitDB() error {
dsn := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s",
os.Getenv("DB_HOST"),
os.Getenv("DB_PORT"),
os.Getenv("DB_USER"),
os.Getenv("DB_PASSWORD"),
os.Getenv("DB_NAME"))
var err error
DB, err = gorm.Open(postgres.Open(dsn), &gorm.Config{})
if err != nil {
return fmt.Errorf("failed to connect to database: %v", err)
}
// Auto-migrate all models
DB.AutoMigrate(&Log{}) // Add other models here
return nil
}

41
backend/utils/db/logs.go Normal file
View File

@@ -0,0 +1,41 @@
package db
import "time"
type Log struct {
ID uint `gorm:"primaryKey"`
Level string `gorm:"size:10;not null"` // "info", "error", etc.
Message string `gorm:"not null"`
Service string `gorm:"size:50"` // Optional: service name
Metadata JSONB `gorm:"type:jsonb"` // Structured fields (e.g., {"user_id": 123})
CreatedAt time.Time `gorm:"index"` // Auto-set by GORM
Checked bool `gorm:"type:boolean;default:false"`
}
// JSONB is a helper type for PostgreSQL JSONB fields.
type JSONB map[string]interface{}
// --- CRUD Operations ---
// CreateLog inserts a new log entry.
func CreateLog(level, message, service string, metadata JSONB) error {
log := Log{
Level: level,
Message: message,
Service: service,
Metadata: metadata,
}
return DB.Create(&log).Error
}
// GetLogsByLevel fetches logs filtered by severity.
func GetLogsByLevel(level string, limit int) ([]Log, error) {
var logs []Log
err := DB.Where("level = ?", level).Limit(limit).Find(&logs).Error
return logs, err
}
// DeleteOldLogs removes logs older than `days`.
func DeleteOldLogs(days int) error {
return DB.Where("created_at < ?", time.Now().AddDate(0, 0, -days)).Delete(&Log{}).Error
}