Rewrite electricity server to .NET web api

.gitignore

@@ -1,6 +1,10 @@
 build/
 bin/
 
+.vscode/
+!.vscode/settings.json
+!.vscode/extensions.json
+
 # ---> C++
 # Prerequisites
 *.d

include/electricity/server/api.hpp

@@ -1,10 +0,0 @@
-#pragma once
-#include <pistache/http.h>
-#include <pistache/router.h>
-
-namespace Server::Api
-{
-    void GetDay(Pistache::Http::Request const & request, Pistache::Http::ResponseWriter responseWrite);
-
-    void SetupRouting(Pistache::Rest::Router & router);
-}

include/electricity/server/configuration.hpp

@@ -1,33 +0,0 @@
-#pragma once
-#include <chrono>
-#include <mutex>
-#include <string>
-
-namespace Server
-{
-    class Configuration {
-    private:
-        std::string logDirectory;
-        std::string serverDomain;
-        std::string lastExternalIp;
-        std::chrono::time_point<std::chrono::steady_clock> lastIpCheckTimePoint;
-        std::mutex externalIpRefreshMutex;
-
-        Configuration();
-        Configuration(Configuration & other) = delete;
-        Configuration(Configuration && other) = delete;
-        Configuration & operator=(Configuration & other) = delete;
-        Configuration & operator=(Configuration && other) = delete;
-
-        void RefreshExternalIp();
-        bool ExternalIpRequiresRefresh() const;
-
-    public:
-        void Setup(std::string & electricityLogDirectory, std::string const & serverDomain);
-
-        std::string const & GetLogDirectory() const;
-        std::string const & GetExternalServerIp();
-
-        static Configuration & Get();
-    };
-}

include/electricity/server/database.hpp

@@ -1,8 +0,0 @@
-#include <string>
-#include <util/date.hpp>
-
-namespace Server::Database
-{
-    std::string GetDetailedJsonOf(Util::Date const & date);
-    std::string GetSummaryJsonOf(Util::Date const & startDate, Util::Date const & stopDate);
-}

src/Electricity.Api/.gitignore

@@ -0,0 +1,2 @@
+obj/
+bin/

src/Electricity.Api/Constants.cs

@@ -0,0 +1,6 @@
+namespace Electricity.Api;
+
+internal static class Constants
+{
+    public const string isoDateFormat = "yyyy-MM-dd";
+}

src/Electricity.Api/Controllers/ElectricityLogController.cs

@@ -0,0 +1,45 @@
+using System.Net.Mime;
+using Electricity.Api.Models;
+using Electricity.Api.Services;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Electricity.Api.Controllers;
+
+[ApiController]
+[Consumes(MediaTypeNames.Application.Json)]
+[Produces(MediaTypeNames.Application.Json)]
+public class ElectricityLogController : ControllerBase
+{
+    private readonly ElectricityService electricityService;
+    private readonly ILogger<ElectricityLogController> logger;
+
+    public ElectricityLogController(
+        ElectricityService electricityService,
+        ILogger<ElectricityLogController> logger)
+    {
+        this.electricityService = electricityService;
+        this.logger = logger;
+    }
+
+    [HttpGet()]
+    [Route("/day")]
+    public async Task<ActionResult<Day[]>> Get([FromQuery] string? start, [FromQuery] string? stop)
+    {
+        if (string.IsNullOrWhiteSpace(start) || !DateOnly.TryParseExact(start, Constants.isoDateFormat, out _))
+        {
+            return BadRequest();
+        }
+
+        if (string.IsNullOrWhiteSpace(stop))
+        {
+            return await electricityService.GetDetailsFor(start);
+        }
+
+        if (!DateOnly.TryParseExact(stop, Constants.isoDateFormat, out _) || string.Compare(start, stop) > 0)
+        {
+            return BadRequest();
+        }
+
+        return await electricityService.GetSummariesFor(start, stop);
+    }
+}

src/Electricity.Api/DatabaseContext.cs

@@ -0,0 +1,45 @@
+using Electricity.Api.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace Electricity.Api
+{
+    public partial class DatabaseContext : DbContext
+    {
+        public DatabaseContext()
+        {
+        }
+
+        public DatabaseContext(DbContextOptions<DatabaseContext> options)
+            : base(options)
+        {
+        }
+
+        public virtual DbSet<ElectricityLog> ElectricityLogs { get; set; } = null!;
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            if (!optionsBuilder.IsConfigured)
+            {
+                optionsBuilder.UseSqlite("Data Source=test.db");
+            }
+        }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<ElectricityLog>(entity =>
+            {
+                entity.HasNoKey();
+
+                entity.ToTable("ElectricityLog");
+
+                entity.HasIndex(e => e.Date, "idx_Date");
+
+                entity.HasIndex(e => e.TimeUtc, "idx_TimeUtc");
+            });
+
+            OnModelCreatingPartial(modelBuilder);
+        }
+
+        partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
+    }
+}

src/Electricity.Api/Electricity.Api.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.6">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="6.0.6" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="6.0.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.3" />
+    <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
+  </ItemGroup>
+
+</Project>

src/Electricity.Api/Entities/ElectricityLog.cs

@@ -0,0 +1,16 @@
+namespace Electricity.Api.Entities
+{
+    public partial class ElectricityLog
+    {
+        public string Date { get; set; } = null!;
+        public string TimeUtc { get; set; } = null!;
+        public double CurrentPowerUsage { get; set; }
+        public double TotalPowerConsumptionDay { get; set; }
+        public double TotalPowerConsumptionNight { get; set; }
+        public double CurrentPowerReturn { get; set; }
+        public double TotalPowerReturnDay { get; set; }
+        public double TotalPowerReturnNight { get; set; }
+        public long DayTarifEnabled { get; set; }
+        public double GasConsumptionInCubicMeters { get; set; }
+    }
+}

src/Electricity.Api/Models/Day.cs

@@ -0,0 +1,36 @@
+namespace Electricity.Api.Models;
+
+public record Day(uint DateTime, double TotalPowerUse, double TotalPowerReturn, double TotalGasUse)
+{
+    public static Day Empty(DateOnly date)
+    {
+        return new Day(
+            ConvertToEpoch(date.ToDateTime(new TimeOnly(0, 0), DateTimeKind.Utc)),
+            0, 0, 0);
+    }
+
+    public static Day FromEntity(Entities.ElectricityLog entity)
+    {
+        return new Day(
+            DateTime: ConvertToEpoch(ParseEntityDateTime(entity.Date, entity.TimeUtc)),
+            TotalPowerUse: entity.TotalPowerConsumptionDay + entity.TotalPowerConsumptionNight,
+            TotalPowerReturn: entity.TotalPowerReturnDay + entity.TotalPowerReturnNight,
+            TotalGasUse: entity.GasConsumptionInCubicMeters
+        );
+    }
+
+    private static DateTime ParseEntityDateTime(string date, string timeUtc)
+    {
+        return System.DateTime
+            .Parse(
+                $"{date}T{timeUtc}Z",
+                null,
+                System.Globalization.DateTimeStyles.AssumeUniversal)
+            .ToUniversalTime();
+    }
+
+    private static uint ConvertToEpoch(DateTime dateTime)
+    {
+        return (uint)Math.Round((dateTime - System.DateTime.UnixEpoch).TotalSeconds);
+    }
+};

src/Electricity.Api/Program.cs

@@ -0,0 +1,59 @@
+using System.CommandLine;
+using Electricity.Api;
+using Electricity.Api.Services;
+using Microsoft.EntityFrameworkCore;
+
+var rootCommand = new RootCommand("ElectricityServer is a small REST API to access the electricity log database");
+var connectionStringArgument = new Option<string>(
+    name: "--connection-string",
+    description: "Filepath to the Sqlite3 database file (*.db)");
+rootCommand.AddOption(connectionStringArgument);
+
+var result = rootCommand.Parse(args);
+
+if (result.Errors.Any())
+{
+    foreach (var error in result.Errors)
+    {
+        Console.WriteLine(error.Message);
+    }
+    return 1;
+}
+
+var sqlite3DatabaseFilePath = result.GetValueForOption(connectionStringArgument);
+if (!File.Exists(sqlite3DatabaseFilePath))
+{
+    Console.WriteLine($"Sqlite3 database <{sqlite3DatabaseFilePath}> does not exist or is inaccessible");
+    return 1;
+}
+
+var builder = WebApplication.CreateBuilder(args);
+builder.Services.AddDbContext<DatabaseContext>((DbContextOptionsBuilder builder) =>
+{
+    builder.UseSqlite($"Data Source={sqlite3DatabaseFilePath}");
+});
+
+builder.Services.AddControllers()
+    .AddJsonOptions(config =>
+    {
+        config.JsonSerializerOptions.PropertyNamingPolicy = System.Text.Json.JsonNamingPolicy.CamelCase;
+        config.JsonSerializerOptions.WriteIndented = true;
+    });
+builder.Services.AddSwaggerGen();
+builder.Services.AddScoped<ElectricityService>();
+
+var app = builder.Build();
+
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+}
+
+app.UseAuthorization();
+
+app.MapControllers();
+
+app.Run();
+
+return 0;

src/Electricity.Api/Properties/launchSettings.json

@@ -0,0 +1,31 @@
+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:44706",
+      "sslPort": 44335
+    }
+  },
+  "profiles": {
+    "Electricity.Api": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7290;http://localhost:5093",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

src/Electricity.Api/Services/ElectricityService.cs

@@ -0,0 +1,66 @@
+using Electricity.Api.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Electricity.Api.Services;
+
+public class ElectricityService
+{
+    private readonly DatabaseContext databaseContext;
+
+    public ElectricityService(DatabaseContext databaseContext)
+    {
+        this.databaseContext = databaseContext;
+    }
+
+    public async Task<Day[]> GetDetailsFor(string date)
+    {
+        return (await databaseContext.ElectricityLogs
+            .Where(l => l.Date == date)
+            .OrderBy(l => l.TimeUtc)
+            .ToArrayAsync())
+            .Select(Day.FromEntity)
+            .ToArray();
+    }
+
+    public async Task<Day[]> GetSummariesFor(string from, string to)
+    {
+        var list = new List<Day>();
+        var current = DateOnly.ParseExact(from, Constants.isoDateFormat);
+        var limit = DateOnly.ParseExact(to, Constants.isoDateFormat);
+        do
+        {
+            list.Add(await GetSummaryFor(current));
+            current = current.AddDays(1);
+        } while (current <= limit);
+
+        return list.ToArray();
+    }
+
+    private async Task<Day> GetSummaryFor(DateOnly date)
+    {
+        var databaseDate = date.ToString(Constants.isoDateFormat);
+        var baseQuery = databaseContext.ElectricityLogs
+            .Where(l => l.Date == databaseDate)
+            .OrderBy(l => l.TimeUtc);
+        var first = await baseQuery.FirstOrDefaultAsync();
+        if (first == null)
+        {
+            return Day.Empty(date);
+        }
+        var last = await baseQuery.LastAsync();
+
+        var firstAsModel = Day.FromEntity(first);
+        if (last.TimeUtc == first.TimeUtc)
+        {
+            return Day.Empty(date);
+        }
+
+        var lastAsModel = Day.FromEntity(last);
+        return new Day(
+            lastAsModel.DateTime,
+            lastAsModel.TotalPowerUse - firstAsModel.TotalPowerUse,
+            lastAsModel.TotalPowerReturn - firstAsModel.TotalPowerReturn,
+            lastAsModel.TotalGasUse - firstAsModel.TotalGasUse
+        );
+    }
+}

src/Electricity.Api/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

src/Electricity.Api/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

src/Electricity.Api/publish.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+dotnet publish -c Release -r linux-arm --no-self-contained

src/electricity-server/main.cpp

@@ -1,51 +0,0 @@
-#include <electricity/server/api.hpp>
-#include <electricity/server/configuration.hpp>
-#include <pistache/endpoint.h>
-#include <tclap/CmdLine.h>
-
-int main(int argc, char ** argv)
-{
-    TCLAP::CmdLine cmd(
-        "electricity-server is a small Pistache based HTTP content server with a REST API to access the solar log database",
-        ' ',
-        "1.0.0");
-
-    TCLAP::ValueArg<unsigned>
-        listeningPortArg("p", "listening-port", "TCP listening port number", true, 0u, "TCP listening port number");
-    cmd.add(listeningPortArg);
-
-    TCLAP::ValueArg<std::string> logDirectoryPath(
-        "d",
-        "data-directory",
-        "Absolute path pointing to the logging directory",
-        true,
-        "",
-        "Absolute path pointing to the logging directory");
-    cmd.add(logDirectoryPath);
-
-    TCLAP::ValueArg<std::string> serverDomain(
-        "s",
-        "server-domain",
-        "Domain this server is hosted on",
-        true,
-        "",
-        "Domain this server is hosted on");
-    cmd.add(serverDomain);
-
-    cmd.parse(argc, argv);
-
-    auto & config = Server::Configuration::Get();
-    config.Setup(logDirectoryPath.getValue(), serverDomain.getValue());
-
-    Pistache::Address address(Pistache::Ipv4::any(), listeningPortArg.getValue());
-    Pistache::Http::Endpoint server(address);
-
-    auto options = Pistache::Http::Endpoint::options().threads(2);
-    server.init(options);
-
-    Pistache::Rest::Router router;
-    Server::Api::SetupRouting(router);
-    server.setHandler(router.handler());
-
-    server.serve();
-}

src/electricity-server/server/api.cpp

@@ -1,96 +0,0 @@
-#include <electricity/server/api.hpp>
-#include <electricity/server/configuration.hpp>
-#include <electricity/server/database.hpp>
-#include <fstream>
-#include <iomanip>
-#include <spdlog/spdlog.h>
-#include <sstream>
-#include <util/date.hpp>
-#include <vector>
-
-namespace Server::Api
-{
-    using Pistache::Http::Mime::Subtype;
-    using Pistache::Http::Mime::Type;
-
-    // Only allow serving to ourselves, all behind the same NAT address
-    bool IsRequesteeAllowed(Pistache::Http::Request const & request)
-    {
-        Configuration & config = Configuration::Get();
-        auto const & serverAddress = config.GetExternalServerIp();
-
-        auto realIpHeader = request.headers().tryGetRaw("X-Real-IP");
-        if(realIpHeader.isEmpty())
-        {
-            spdlog::error("Blocking request without X-Real-IP header");
-            return false;
-        }
-
-        if(realIpHeader.unsafeGet().value() != serverAddress)
-        {
-            spdlog::info(
-                "Blocking request {} due to host mismatch (expected {})",
-                realIpHeader.unsafeGet().value(),
-                serverAddress);
-            return false;
-        }
-
-        return true;
-    }
-
-    void GetDay(Pistache::Http::Request const & request, Pistache::Http::ResponseWriter responseWrite)
-    {
-        spdlog::info(
-            "{} {} {}",
-            Pistache::Http::methodString(request.method()),
-            request.resource(),
-            request.query().as_str());
-
-        if(!IsRequesteeAllowed(request))
-        {
-            responseWrite.send(Pistache::Http::Code::Unauthorized);
-            return;
-        }
-
-        auto const startQuery = request.query().get("start");
-        if(startQuery.isEmpty())
-        {
-            responseWrite.send(Pistache::Http::Code::Bad_Request);
-            return;
-        }
-
-        Util::Date const startDate(startQuery.unsafeGet());
-        if(!startDate.IsValid())
-        {
-            responseWrite.send(Pistache::Http::Code::Bad_Request);
-            return;
-        }
-
-        auto const stopQuery = request.query().get("stop");
-        if(stopQuery.isEmpty())
-        {
-            responseWrite.send(
-                Pistache::Http::Code::Ok,
-                Database::GetDetailedJsonOf(startDate),
-                MIME(Application, Json));
-            return;
-        }
-
-        Util::Date const stopDate(stopQuery.unsafeGet());
-        if(!stopDate.IsValid() || stopDate.IsBefore(startDate))
-        {
-            responseWrite.send(Pistache::Http::Code::Bad_Request);
-            return;
-        }
-
-        responseWrite.send(
-            Pistache::Http::Code::Ok,
-            Database::GetSummaryJsonOf(startDate, stopDate),
-            MIME(Application, Json));
-    }
-
-    void SetupRouting(Pistache::Rest::Router & router)
-    {
-        Pistache::Rest::Routes::Get(router, "/day", Pistache::Rest::Routes::bind(&GetDay));
-    }
-}

src/electricity-server/server/configuration.cpp

@@ -1,98 +0,0 @@
-#include <arpa/inet.h>
-#include <electricity/server/configuration.hpp>
-#include <errno.h>
-#include <netdb.h>
-#include <regex>
-#include <spdlog/spdlog.h>
-#include <sys/socket.h>
-
-namespace Server
-{
-    Configuration::Configuration() : logDirectory() { }
-
-    void Configuration::RefreshExternalIp()
-    {
-        addrinfo hints;
-        hints.ai_family = AF_INET;
-        hints.ai_socktype = SOCK_STREAM;
-        hints.ai_flags = AI_PASSIVE;
-        hints.ai_protocol = 0;
-        hints.ai_canonname = nullptr;
-        hints.ai_addr = nullptr;
-        hints.ai_next = nullptr;
-
-        addrinfo * serverInfo;
-        auto const result = getaddrinfo(serverDomain.c_str(), "http", &hints, &serverInfo);
-        if(result)
-        {
-            spdlog::error(
-                "Error {} when parsing domain {} to determine external IP address",
-                gai_strerror(result),
-                serverDomain);
-            lastExternalIp.clear();
-            return;
-        }
-
-        char addressBuffer[INET_ADDRSTRLEN];
-        sockaddr_in * socketAddress = reinterpret_cast<sockaddr_in *>(serverInfo->ai_addr);
-        if(inet_ntop(AF_INET, &socketAddress->sin_addr, addressBuffer, INET_ADDRSTRLEN) != nullptr)
-        {
-            lastIpCheckTimePoint = std::chrono::steady_clock::now();
-            lastExternalIp = std::string(addressBuffer);
-            spdlog::info("External IP address {} cached", lastExternalIp);
-        }
-        else
-        {
-            auto const error = errno;
-            spdlog::error("Error {} returned by inet_ntop when trying to determine external IP address", error);
-            lastExternalIp.clear();
-        }
-
-        freeaddrinfo(serverInfo);
-        return;
-    }
-
-    bool Configuration::ExternalIpRequiresRefresh() const
-    {
-        if(!std::regex_match(lastExternalIp, std::regex("^([0-9]+\\.){3}[0-9]+$")))
-        {
-            return true;
-        }
-
-        auto timeSinceLastRefresh = std::chrono::steady_clock::now() - lastIpCheckTimePoint;
-        return timeSinceLastRefresh >= std::chrono::minutes(5);
-    }
-
-    void Configuration::Setup(std::string & electricityLogDirectory, std::string const & _serverDomain)
-    {
-        logDirectory = electricityLogDirectory;
-        if(electricityLogDirectory.size() > 0 && electricityLogDirectory[electricityLogDirectory.size() - 1] != '/')
-        {
-            logDirectory += '/';
-        }
-
-        serverDomain = _serverDomain;
-    }
-
-    std::string const & Configuration::GetLogDirectory() const { return logDirectory; }
-
-    std::string const & Configuration::GetExternalServerIp()
-    {
-        if(ExternalIpRequiresRefresh())
-        {
-            std::lock_guard<std::mutex> lock(externalIpRefreshMutex);
-            if(ExternalIpRequiresRefresh())
-            {
-                RefreshExternalIp();
-            }
-        }
-
-        return lastExternalIp;
-    }
-
-    Configuration & Configuration::Get()
-    {
-        static Configuration c;
-        return c;
-    }
-}

src/electricity-server/server/database.cpp

@@ -1,211 +0,0 @@
-#include <electricity/server/configuration.hpp>
-#include <electricity/server/database.hpp>
-#include <fstream>
-#include <iomanip>
-#include <sstream>
-#include <util/date.hpp>
-#include <vector>
-
-namespace Server::Database
-{
-    struct Record
-    {
-    private:
-        bool isValid;
-
-    public:
-        long epoch;
-        double currentPowerUsage;
-        double totalPowerUsageDay;
-        double totalPowerUsageNight;
-        double currentPowerReturn;
-        double totalPowerReturnDay;
-        double totalPowerReturnNight;
-        double totalGasUsage;
-
-        bool IsValid() const { return isValid; }
-
-        void AppendAsJson(std::stringstream & ss) const
-        {
-            ss << "{\"dateTime\":" << epoch << ",\"totalPowerUse\":" << totalPowerUsageDay + totalPowerUsageNight
-               << ",\"totalPowerReturn\":" << totalPowerReturnDay + totalPowerReturnNight
-               << ",\"totalGasUse\":" << totalGasUsage << '}';
-        }
-
-        Record()
-         : isValid(false), currentPowerUsage(0.0), totalPowerUsageDay(0.0), totalPowerUsageNight(0.0),
-           currentPowerReturn(0.0), totalPowerReturnDay(0.0), totalPowerReturnNight(0.0), totalGasUsage(0.0)
-        { }
-
-        Record(std::string const & line)
-         : isValid(false), currentPowerUsage(0.0), totalPowerUsageDay(0.0), totalPowerUsageNight(0.0),
-           currentPowerReturn(0.0), totalPowerReturnDay(0.0), totalPowerReturnNight(0.0), totalGasUsage(0.0)
-        {
-            std::vector<std::string> values;
-
-            char const delimiter = ',';
-            std::size_t previousIndex = 0;
-            while(true)
-            {
-                auto const commaIndex = line.find(delimiter, previousIndex + 1);
-                if(commaIndex != std::string::npos)
-                {
-                    values.push_back(line.substr(previousIndex, commaIndex - previousIndex));
-                    previousIndex = commaIndex + 1;
-                }
-                else
-                {
-                    break;
-                }
-            }
-
-            if(previousIndex < line.size())
-            {
-                values.push_back(line.substr(previousIndex));
-            }
-
-            if(values.size() != 10)
-            {
-                return;
-            }
-
-            Util::Date const date(values[0]);
-            if(!date.IsValid())
-            {
-                return;
-            }
-            int hours, minutes, seconds;
-            if(std::sscanf(values[0].substr(11).c_str(), "%d:%d:%d", &hours, &minutes, &seconds) != 3)
-            {
-                return;
-            }
-
-            /* Fields are separated by comma's and represent:
-				1 datetime
-				2 currentPowerUsage (kw)
-				3 totalPowerConsumptionDay (kwh)
-				4 totalPowerConsumptionNight (kwh)
-				5 currentPowerReturn (kw)
-				6 totalPowerReturnedDay (kwh)
-				7 totalPowerReturnedNight (kwh)
-				8 tarif type (unused)
-				9 gas timestamp (unused)
-				10 gas consumption (M^3)
-			*/
-            epoch = date.ToEpoch() + hours * 3600 + minutes * 60 + seconds - 3600;
-            currentPowerUsage = std::atof(values[1].c_str());
-            totalPowerUsageDay = std::atof(values[2].c_str());
-            totalPowerUsageNight = std::atof(values[3].c_str());
-            currentPowerReturn = std::atof(values[4].c_str());
-            totalPowerReturnDay = std::atof(values[5].c_str());
-            totalPowerReturnNight = std::atof(values[6].c_str());
-            totalGasUsage = std::atof(values[9].c_str());
-
-            isValid = true;
-        }
-    };
-
-    std::string GetFileName(Util::Date const & date)
-    {
-        std::stringstream filePath;
-        filePath << Configuration::Get().GetLogDirectory() << date.Year() << '/' << std::setw(2) << std::setfill('0')
-                 << date.Month() << '_' << std::setw(2) << date.Day() << ".txt";
-
-        return filePath.str();
-    }
-
-    std::vector<Record> GetFileContents(Util::Date const & date)
-    {
-        std::ifstream logFile(GetFileName(date));
-        if(!logFile.is_open())
-        {
-            return std::vector<Record>();
-        }
-
-        std::vector<Record> retval;
-        std::string line;
-        while(std::getline(logFile, line))
-        {
-            Record record(line);
-            if(record.IsValid())
-            {
-                retval.push_back(record);
-            }
-        }
-        logFile.close();
-
-        return retval;
-    }
-
-    std::string GetDetailedJsonOf(Util::Date const & date)
-    {
-        auto const records = GetFileContents(date);
-        std::stringstream json;
-        json << '[';
-
-        bool first = true;
-        for(std::size_t i = 0; i < records.size(); ++i)
-        {
-            if(!first)
-            {
-                json << ',';
-            }
-            first = false;
-
-            records[i].AppendAsJson(json);
-        }
-
-        json << ']';
-        return json.str();
-    }
-
-    bool GetSummaryJsonOf(Util::Date const & date, bool const prependComma, std::stringstream & json)
-    {
-        if(prependComma)
-        {
-            json << ',';
-        }
-
-        auto const records = GetFileContents(date);
-        if(records.size() < 2)
-        {
-            Record record;
-            record.epoch = date.ToEpoch();
-
-            record.AppendAsJson(json);
-
-            return false;
-        }
-
-        auto const firstRecord = records[0];
-        auto lastRecord = records[records.size() - 1];
-        lastRecord.totalPowerUsageDay -= firstRecord.totalPowerUsageDay;
-        lastRecord.totalPowerUsageNight -= firstRecord.totalPowerUsageNight;
-        lastRecord.totalPowerReturnDay -= firstRecord.totalPowerReturnDay;
-        lastRecord.totalPowerReturnNight -= firstRecord.totalPowerReturnNight;
-        lastRecord.totalGasUsage -= firstRecord.totalGasUsage;
-
-        lastRecord.AppendAsJson(json);
-
-        return true;
-    }
-
-    std::string GetSummaryJsonOf(Util::Date const & startDate, Util::Date const & stopDate)
-    {
-        std::stringstream json;
-        json << '[';
-
-        long const dayInSeconds = 24 * 60 * 60;
-        long const start = startDate.ToEpoch();
-        long const stop = stopDate.ToEpoch();
-        bool first = true;
-        for(long current = start; current <= stop; current += dayInSeconds)
-        {
-            GetSummaryJsonOf(Util::Date(current), !first, json);
-            first = false;
-        }
-
-        json << ']';
-        return json.str();
-    }
-}

systemd/electricity-server.service

@@ -1,13 +1,15 @@
 [Unit]
-Description=A pistache based HTTP server serving the Electricity API
+Description=A .NET Core application providing the Electricity REST API
 Requires=network.target
 After=network.target
 
 [Service]
 Type=simple
-ExecStart=/usr/local/bin/electricity-server -d /mnt/data0/log/electricity -p 3002 -s electricity.valkendaal.duckdns.org
+Environment=ASPNETCORE_URLS=http://*:5000
+ExecStart=/home/pi/.dotnet/dotnet /home/pi/bin/Electricity.Api/Electricity.Api.dll --connection-string /home/pi/logs/electricity.logs
 Restart=always
 RestartSec=30
+User=pi
 
 [Install]
 WantedBy=multi-user.target