Migrate existing code

Integrations/Kea/KeaDhcp6Lease.cs

@@ -0,0 +1,196 @@
+using System.Net;
+using System.Net.NetworkInformation;
+
+using nietras.SeparatedValues;
+
+using Cell = System.ReadOnlySpan<char>;
+
+namespace DotNetDDI.Integrations.Kea;
+
+using Lease = KeaDhcp6Lease;
+
+// ref: https://github.com/isc-projects/kea/blob/Kea-2.5.3/src/lib/dhcpsrv/csv_lease_file6.h
+public record struct KeaDhcp6Lease(
+	IPAddress Address,
+	string DUId,
+	TimeSpan ValidLifetime,
+	DateTimeOffset Expire,
+	uint SubnetId,
+	uint PrefLifetime,
+	LeaseType LeaseType,
+	uint IAId,
+	byte PrefixLen,
+	bool FqdnFwd,
+	bool FqdnRev,
+	string Hostname,
+	PhysicalAddress HWAddr,
+	uint State,
+	string? UserContext,
+	ushort? HWType,
+	uint? HWAddrSource,
+	uint PoolId)
+{
+	public static Lease? Parse(in SepReader.Row row)
+	{
+		Lease result = new();
+		for (int i = 0; i < row.ColCount; i++)
+		{
+			if (Parse(ref result, i, row[i].Span) == false)
+			{
+				return null;
+			}
+		}
+
+		return result;
+	}
+
+	private static bool? Parse(ref Lease lease, int column, in Cell span)
+	{
+		return column switch
+		{
+			0 => ToAddress(ref lease, span),
+			1 => ToDUId(ref lease, span),
+			2 => ToValidLifetime(ref lease, span),
+			3 => ToExpire(ref lease, span),
+			4 => ToSubnetId(ref lease, span),
+			5 => ToPrefLifetime(ref lease, span),
+			6 => ToLeaseType(ref lease, span),
+			7 => ToIAId(ref lease, span),
+			8 => ToPrefixLen(ref lease, span),
+			9 => ToFqdnFwd(ref lease, span),
+			10 => ToFqdnRev(ref lease, span),
+			11 => ToHostname(ref lease, span),
+			12 when !span.IsWhiteSpace() => ToHWAddr(ref lease, span),
+			13 => ToState(ref lease, span),
+			14 when !span.IsWhiteSpace() => ToUserContext(ref lease, span),
+			15 => ToHWType(ref lease, span),
+			16 => ToHWAddrSource(ref lease, span),
+			17 => ToPoolId(ref lease, span),
+
+			_ => null
+		};
+
+		static bool ToAddress(ref Lease lease, in Cell span)
+		{
+			bool result = IPAddress.TryParse(span, out var address);
+			lease.Address = address!;
+			return result;
+		}
+
+		static bool ToDUId(ref Lease lease, in Cell span)
+		{
+			lease.DUId = span.ToString();
+			return true;
+		}
+
+		static bool ToValidLifetime(ref Lease lease, in Cell span)
+		{
+			bool result = uint.TryParse(span, out var validLifetime);
+			lease.ValidLifetime = TimeSpan.FromSeconds(validLifetime);
+			return result;
+		}
+
+		static bool ToExpire(ref Lease lease, in Cell span)
+		{
+			bool result = ulong.TryParse(span, out var expire);
+			lease.Expire = DateTimeOffset.FromUnixTimeSeconds(unchecked((long)expire));
+			return result;
+		}
+
+		static bool ToSubnetId(ref Lease lease, in Cell span)
+		{
+			bool result = uint.TryParse(span, out var subnetId);
+			lease.SubnetId = subnetId;
+			return result;
+		}
+
+		static bool ToPrefLifetime(ref Lease lease, in Cell span)
+		{
+			bool result = uint.TryParse(span, out var prefLifetime);
+			lease.PrefLifetime = prefLifetime;
+			return result;
+		}
+
+		static bool ToLeaseType(ref Lease lease, in Cell span)
+		{
+			bool result = byte.TryParse(span, out var leaseType);
+			lease.LeaseType = (LeaseType)leaseType;
+			return result;
+		}
+
+		static bool ToIAId(ref Lease lease, in Cell span)
+		{
+			bool result = uint.TryParse(span, out var iaId);
+			lease.IAId = iaId;
+			return result;
+		}
+
+		static bool ToPrefixLen(ref Lease lease, in Cell span)
+		{
+			bool result = byte.TryParse(span, out var prefixLen);
+			lease.PrefixLen = prefixLen;
+			return result;
+		}
+
+		static bool ToFqdnFwd(ref Lease lease, in Cell span)
+		{
+			bool result = byte.TryParse(span, out var fqdnFwd);
+			lease.FqdnFwd = fqdnFwd != 0;
+			return result;
+		}
+
+		static bool ToFqdnRev(ref Lease lease, in Cell span)
+		{
+			bool result = byte.TryParse(span, out var fqdnRev);
+			lease.FqdnRev = fqdnRev != 0;
+			return result;
+		}
+
+		static bool ToHostname(ref Lease lease, in Cell span)
+		{
+			lease.Hostname = KeaDhcpLease.Unescape(span);
+			return true;
+		}
+
+		static bool ToHWAddr(ref Lease lease, in Cell span)
+		{
+			bool result = PhysicalAddress.TryParse(span, out var hwAddr);
+			lease.HWAddr = hwAddr!;
+			return result;
+		}
+
+		static bool ToState(ref Lease lease, in Cell span)
+		{
+			bool result = uint.TryParse(span, out var state);
+			lease.State = state;
+			return result;
+		}
+
+		static bool ToUserContext(ref Lease lease, in Cell span)
+		{
+			lease.UserContext = KeaDhcpLease.Unescape(span);
+			return true;
+		}
+
+		static bool ToHWType(ref Lease lease, in Cell span)
+		{
+			bool result = ushort.TryParse(span, out var hwType);
+			lease.HWType = hwType;
+			return result;
+		}
+
+		static bool ToHWAddrSource(ref Lease lease, in Cell span)
+		{
+			bool result = uint.TryParse(span, out var hwAddrSource);
+			lease.HWAddrSource = hwAddrSource;
+			return result;
+		}
+
+		static bool ToPoolId(ref Lease lease, in Cell span)
+		{
+			bool result = uint.TryParse(span, out var poolId);
+			lease.PoolId = poolId;
+			return result;
+		}
+	}
+}