feat(modbus): resolve equipment-tag refs (read + write) via EquipmentTagRefResolver

2026-06-13 11:12:01 -04:00
parent eaa335d779
commit 232c557985
3 changed files with 128 additions and 4 deletions
@@ -0,0 +1,54 @@
+using System.Text.Json;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus;
+
+/// <summary>Parses an equipment tag's <c>TagConfig</c> JSON (the shape authored by the AdminUI
+/// <c>ModbusTagConfigModel</c>) into a transient <see cref="ModbusTagDefinition"/> whose
+/// <see cref="ModbusTagDefinition.Name"/> equals the reference string itself, so a value the
+/// driver publishes back keys the runtime's forward router correctly.</summary>
+public static class ModbusEquipmentTagParser
+{
+    /// <summary>Attempts to parse an equipment-tag reference into a transient definition.</summary>
+    /// <param name="reference">The equipment tag's TagConfig JSON (also used as the def identity).</param>
+    /// <param name="def">The transient definition when parsing succeeds.</param>
+    /// <returns><see langword="true"/> when <paramref name="reference"/> is a Modbus address object.</returns>
+    public static bool TryParse(string reference, out ModbusTagDefinition def)
+    {
+        def = null!;
+        // Authored tag names never start with '{' (AdminUI name validation), so a leading brace marks an equipment-tag TagConfig blob.
+        if (string.IsNullOrWhiteSpace(reference) || reference[0] != '{') return false;
+        try
+        {
+            using var doc = JsonDocument.Parse(reference);
+            var root = doc.RootElement;
+            if (root.ValueKind != JsonValueKind.Object
+                || !root.TryGetProperty("region", out _)
+                || !root.TryGetProperty("address", out var addr))
+                return false;
+            if (addr.ValueKind != JsonValueKind.Number
+                || !addr.TryGetInt32(out var address)
+                || address < 0 || address > ushort.MaxValue)
+                return false;
+            var region = ReadEnum(root, "region", ModbusRegion.HoldingRegisters);
+            var dataType = ReadEnum(root, "dataType", ModbusDataType.Int16);
+            var byteOrder = ReadEnum(root, "byteOrder", ModbusByteOrder.BigEndian);
+            var bitIndex = (byte)ReadInt(root, "bitIndex");
+            var stringLength = (ushort)ReadInt(root, "stringLength");
+            def = new ModbusTagDefinition(
+                Name: reference, Region: region, Address: (ushort)address, DataType: dataType,
+                Writable: true, ByteOrder: byteOrder, BitIndex: bitIndex, StringLength: stringLength);
+            return true;
+        }
+        catch (JsonException) { return false; }
+        catch (FormatException) { return false; }
+        catch (InvalidOperationException) { return false; }
+    }
+
+    private static TEnum ReadEnum<TEnum>(JsonElement o, string name, TEnum fallback) where TEnum : struct, Enum
+        => o.TryGetProperty(name, out var e) && e.ValueKind == JsonValueKind.String
+           && Enum.TryParse<TEnum>(e.GetString(), ignoreCase: true, out var v) ? v : fallback;
+
+    private static int ReadInt(JsonElement o, string name)
+        => o.TryGetProperty(name, out var e) && e.ValueKind == JsonValueKind.Number
+           && e.TryGetInt32(out var v) ? v : 0;
+}