init

.gitignore

@@ -0,0 +1,484 @@
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+# Vim temporary swap files
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Controllers/LogsController.cs

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+using GetFromLoki.Models;
+using GetFromLoki.Services;
+using Microsoft.AspNetCore.Mvc;
+
+namespace GetFromLoki.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class LogsController : ControllerBase
+{
+    private readonly ILokiService _lokiService;
+
+    public LogsController(ILokiService lokiService)
+    {
+        _lokiService = lokiService;
+    }
+
+    /// <summary>
+    /// Получить логи по лейблу
+    /// </summary>
+    /// <param name="request">Параметры запроса</param>
+    /// <returns>Список логов с timestamp и message</returns>
+    [HttpPost("query")]
+    public async Task<ActionResult<List<LogEntry>>> GetLogs([FromBody] LogQueryRequest request)
+    {
+        try
+        {
+            if (request.Labels.Count == 0)
+            {
+                return BadRequest("Должен быть указан хотя бы один лейбл");
+            }
+
+            var logs = await _lokiService.GetLogsAsync(request);
+            return Ok(logs);
+        }
+        catch (Exception ex)
+        {
+            return StatusCode(500, new { error = ex.Message });
+        }
+    }
+
+    /// <summary>
+    /// Получить логи по лейблам (GET запрос)
+    /// </summary>
+    /// <param name="labels">Лейблы в формате "key1=value1,key2=value2"</param>
+    /// <param name="startTime">Время начала (опционально)</param>
+    /// <param name="endTime">Время окончания (опционально)</param>
+    /// <param name="limit">Лимит записей (по умолчанию 100)</param>
+    /// <returns>Список логов с timestamp и message</returns>
+    [HttpGet("query")]
+    public async Task<ActionResult<List<LogEntry>>> GetLogs(
+        [FromQuery] string labels,
+        [FromQuery] DateTime? startTime = null,
+        [FromQuery] DateTime? endTime = null,
+        [FromQuery] int? limit = null)
+    {
+        try
+        {
+            if (string.IsNullOrWhiteSpace(labels))
+            {
+                return BadRequest("Labels обязателен для запроса");
+            }
+
+            var request = new LogQueryRequest
+            {
+                Labels = ParseLabels(labels),
+                StartTime = startTime,
+                EndTime = endTime,
+                Limit = limit
+            };
+
+            if (request.Labels.Count == 0)
+            {
+                return BadRequest("Не удалось распарсить лейблы");
+            }
+
+            var logs = await _lokiService.GetLogsAsync(request);
+            return Ok(logs);
+        }
+        catch (Exception ex)
+        {
+            return StatusCode(500, new { error = ex.Message });
+        }
+    }
+
+    private static Dictionary<string, string> ParseLabels(string labelsString)
+    {
+        var result = new Dictionary<string, string>();
+        var pairs = labelsString.Split(',', StringSplitOptions.RemoveEmptyEntries);
+        
+        foreach (var pair in pairs)
+        {
+            var parts = pair.Split('=', 2);
+            if (parts.Length == 2)
+            {
+                result[parts[0].Trim()] = parts[1].Trim();
+            }
+        }
+        
+        return result;
+    }
+}

GetFromLoki.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
+  </ItemGroup>
+
+</Project>

Models/LokiModels.cs

@@ -0,0 +1,36 @@
+namespace GetFromLoki.Models;
+
+// Модель для запроса логов
+public class LogQueryRequest
+{
+    public Dictionary<string, string> Labels { get; set; } = new();
+    public DateTime? StartTime { get; set; }
+    public DateTime? EndTime { get; set; }
+    public int? Limit { get; set; } = 100;
+}
+
+// Модель для ответа с логами
+public class LogEntry
+{
+    public DateTime Timestamp { get; set; }
+    public string Message { get; set; } = string.Empty;
+}
+
+// Модель ответа Loki API
+public class LokiQueryResponse
+{
+    public string Status { get; set; } = string.Empty;
+    public LokiData Data { get; set; } = new();
+}
+
+public class LokiData
+{
+    public string ResultType { get; set; } = string.Empty;
+    public List<LokiResult> Result { get; set; } = new();
+}
+
+public class LokiResult
+{
+    public Dictionary<string, string> Stream { get; set; } = new();
+    public List<List<string>> Values { get; set; } = new();
+}

Program.cs

@@ -0,0 +1,24 @@
+using GetFromLoki.Services;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddControllers();
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+
+// Register Loki service
+builder.Services.AddHttpClient<ILokiService, LokiService>();
+builder.Services.Configure<LokiOptions>(
+    builder.Configuration.GetSection("Loki"));
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+app.UseSwagger();
+app.UseSwaggerUI();
+
+app.UseAuthorization();
+app.MapControllers();
+
+app.Run();

README.md

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+# Get From Loki
+
+Компактный REST API сервис на C# для получения логов из Grafana Loki.
+
+## Описание
+
+Сервис предоставляет REST API для запроса логов из Grafana Loki по лейблам и возвращает их в формате `{timestamp, message}`.
+
+## Требования
+
+- .NET 8.0
+- Grafana Loki (работающий на http://localhost:3100)
+
+## Запуск
+
+1. Убедитесь, что Grafana Loki запущен на http://localhost:3100
+2. Выполните команды:
+
+```bash
+dotnet restore
+dotnet run --urls http://0.0.0.0:5000
+```
+
+Сервис будет доступен по адресу: http://localhost:5000
+
+## API Endpoints
+
+### GET /api/logs/query
+Получить логи по лейблам через GET запрос
+
+**Параметры:**
+- `labels` (обязательный) - лейблы в формате "key1=value1,key2=value2"
+- `startTime` (опциональный) - время начала в формате ISO 8601
+- `endTime` (опциональный) - время окончания в формате ISO 8601
+- `limit` (опциональный) - лимит записей (по умолчанию 100)
+
+**Примеры:**
+```
+GET /api/logs/query?labels=job=cron,service_name=system&limit=50
+GET /api/logs/query?labels=app=myapp,level=error&startTime=2024-01-01T00:00:00Z&endTime=2024-01-01T23:59:59Z
+```
+
+### POST /api/logs/query
+Получить логи по лейблам через POST запрос
+
+**Тело запроса:**
+```json
+{
+  "labels": {
+    "job": "cron",
+    "service_name": "system",
+    "level": "info"
+  },
+  "startTime": "2024-01-01T00:00:00Z",
+  "endTime": "2024-01-01T23:59:59Z",
+  "limit": 100
+}
+```
+
+## Примеры использования
+
+### Простой запрос по одному лейблу:
+```bash
+curl "http://localhost:5000/api/logs/query?labels=job=cron&limit=10"
+```
+
+### Запрос по нескольким лейблам:
+```bash
+curl "http://localhost:5000/api/logs/query?labels=job=cron,service_name=system,level=info&limit=20"
+```
+
+### POST запрос с временным окном:
+```bash
+curl -X POST "http://localhost:5000/api/logs/query" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "labels": {
+      "app": "myapp",
+      "environment": "production"
+    },
+    "startTime": "2024-01-01T00:00:00Z",
+    "endTime": "2024-01-01T01:00:00Z",
+    "limit": 50
+  }'
+```
+
+## Ответ
+
+Сервис возвращает массив объектов в формате:
+```json
+[
+  {
+    "timestamp": "2024-01-01T12:00:00Z",
+    "message": "Log message content"
+  }
+]
+```
+
+## Конфигурация
+
+Настройки подключения к Loki находятся в файле `appsettings.json`:
+
+```json
+{
+  "Loki": {
+    "BaseUrl": "http://localhost:3100",
+    "QueryTimeout": 30
+  }
+}
+```
+
+## LogQL запросы
+
+Сервис автоматически формирует LogQL запросы для Loki API:
+
+- `{job="cron",service_name="system"}` - точное совпадение значений
+- `{job!=""}` - существование лейбла (если значение не указано)
+
+## Swagger UI
+
+После запуска сервиса документация API доступна по адресу:
+http://localhost:5000/swagger

Services/ILokiService.cs

@@ -0,0 +1,8 @@
+using GetFromLoki.Models;
+
+namespace GetFromLoki.Services;
+
+public interface ILokiService
+{
+    Task<List<LogEntry>> GetLogsAsync(LogQueryRequest request);
+}

Services/LokiOptions.cs

@@ -0,0 +1,7 @@
+namespace GetFromLoki.Services;
+
+public class LokiOptions
+{
+    public string BaseUrl { get; set; } = "http://localhost:3100";
+    public int QueryTimeout { get; set; } = 30;
+}

Services/LokiService.cs

@@ -0,0 +1,113 @@
+using System.Text.Json;
+using GetFromLoki.Models;
+using Microsoft.Extensions.Options;
+
+namespace GetFromLoki.Services;
+
+public class LokiService : ILokiService
+{
+    private readonly HttpClient _httpClient;
+    private readonly LokiOptions _options;
+
+    public LokiService(HttpClient httpClient, IOptions<LokiOptions> options)
+    {
+        _httpClient = httpClient;
+        _options = options.Value;
+        _httpClient.BaseAddress = new Uri(_options.BaseUrl);
+        _httpClient.Timeout = TimeSpan.FromSeconds(_options.QueryTimeout);
+    }
+
+    public async Task<List<LogEntry>> GetLogsAsync(LogQueryRequest request)
+    {
+        var logs = new List<LogEntry>();
+        
+        // Формируем LogQL запрос
+        var query = BuildLogQLQuery(request);
+        
+        // Формируем URL с параметрами
+        var queryParams = new List<string>
+        {
+            $"query={Uri.EscapeDataString(query)}",
+            $"limit={request.Limit ?? 100}"
+        };
+
+        if (request.StartTime.HasValue)
+        {
+            var startTimeNs = ((DateTimeOffset)request.StartTime.Value).ToUnixTimeMilliseconds() * 1_000_000;
+            queryParams.Add($"start={startTimeNs}");
+        }
+
+        if (request.EndTime.HasValue)
+        {
+            var endTimeNs = ((DateTimeOffset)request.EndTime.Value).ToUnixTimeMilliseconds() * 1_000_000;
+            queryParams.Add($"end={endTimeNs}");
+        }
+
+        var url = $"/loki/api/v1/query_range?{string.Join("&", queryParams)}";
+
+        try
+        {
+            var response = await _httpClient.GetAsync(url);
+            response.EnsureSuccessStatusCode();
+
+            var jsonResponse = await response.Content.ReadAsStringAsync();
+            var lokiResponse = JsonSerializer.Deserialize<LokiQueryResponse>(
+                jsonResponse,
+                new JsonSerializerOptions { PropertyNameCaseInsensitive = true }
+            );
+
+            if (lokiResponse?.Data?.Result != null)
+            {
+                foreach (var result in lokiResponse.Data.Result)
+                {
+                    foreach (var value in result.Values)
+                    {
+                        if (value.Count >= 2)
+                        {
+                            // Loki возвращает timestamp в наносекундах
+                            if (long.TryParse(value[0], out var timestampNs))
+                            {
+                                var timestamp = DateTimeOffset.FromUnixTimeMilliseconds(timestampNs / 1000000).DateTime;
+                                logs.Add(new LogEntry
+                                {
+                                    Timestamp = timestamp,
+                                    Message = value[1]
+                                });
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            throw new InvalidOperationException($"Ошибка при получении логов из Loki: {ex.Message}", ex);
+        }
+
+        return logs.OrderBy(l => l.Timestamp).ToList();
+    }
+
+    private static string BuildLogQLQuery(LogQueryRequest request)
+    {
+        var query = "{";
+        var conditions = new List<string>();
+        
+        // Добавляем все лейблы
+        foreach (var label in request.Labels)
+        {
+            if (!string.IsNullOrEmpty(label.Value))
+            {
+                conditions.Add($"{label.Key}=\"{label.Value}\"");
+            }
+            else
+            {
+                conditions.Add($"{label.Key}!=\"\"");
+            }
+        }
+        
+        query += string.Join(",", conditions);
+        query += "}";
+        
+        return query;
+    }
+}

appsettings.json

@@ -0,0 +1,13 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "Loki": {
+    "BaseUrl": "http://localhost:3100",
+    "QueryTimeout": 30
+  }
+}