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Phase 2 WP-1–13+23: Template Engine CRUD, composition, overrides, locking, collision detection, acyclicity

Browse Source 
- WP-23: ITemplateEngineRepository full EF Core implementation
- WP-1: Template CRUD with deletion constraints (instances, children, compositions)
- WP-2–4: Attribute, alarm, script definitions with lock flags and override granularity
- WP-5: Shared script CRUD with syntax validation
- WP-6–7: Composition with recursive nesting and canonical naming
- WP-8–11: Override granularity, locking rules, inheritance/composition scope
- WP-12: Naming collision detection on canonical names (recursive)
- WP-13: Graph acyclicity (inheritance + composition cycles)
Core services: TemplateService, SharedScriptService, TemplateResolver,
LockEnforcer, CollisionDetector, CycleDetector. 358 tests pass.
This commit is contained in:
Joseph Doherty
2026-03-16 20:10:34 -04:00
parent 84ad6bb77d
commit faef2d0de6
47 changed files with 7741 additions and 11 deletions
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135
src/ScadaLink.TemplateEngine/Flattening/DiffService.cs Normal file
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using ScadaLink.Commons.Types.Flattening;
namespace ScadaLink.TemplateEngine.Flattening;
/// <summary>
/// Compares two FlattenedConfigurations (deployed vs current) and produces a ConfigurationDiff
/// showing Added, Removed, and Changed entries for attributes, alarms, and scripts.
/// </summary>
public class DiffService
{
/// <summary>
/// Computes the diff between an old (deployed) and new (current) flattened configuration.
/// </summary>
/// <param name="oldConfig">The previously deployed configuration. Null for first-time deployment.</param>
/// <param name="newConfig">The current flattened configuration.</param>
/// <param name="oldRevisionHash">The revision hash of the old config, if any.</param>
/// <param name="newRevisionHash">The revision hash of the new config.</param>
/// <returns>A ConfigurationDiff with all changes.</returns>
public ConfigurationDiff ComputeDiff(
FlattenedConfiguration? oldConfig,
FlattenedConfiguration newConfig,
string? oldRevisionHash = null,
string? newRevisionHash = null)
{
ArgumentNullException.ThrowIfNull(newConfig);
var attributeChanges = ComputeEntityDiff(
oldConfig?.Attributes ?? [],
newConfig.Attributes,
a => a.CanonicalName,
AttributesEqual);
var alarmChanges = ComputeEntityDiff(
oldConfig?.Alarms ?? [],
newConfig.Alarms,
a => a.CanonicalName,
AlarmsEqual);
var scriptChanges = ComputeEntityDiff(
oldConfig?.Scripts ?? [],
newConfig.Scripts,
s => s.CanonicalName,
ScriptsEqual);
return new ConfigurationDiff
{
InstanceUniqueName = newConfig.InstanceUniqueName,
OldRevisionHash = oldRevisionHash,
NewRevisionHash = newRevisionHash,
AttributeChanges = attributeChanges,
AlarmChanges = alarmChanges,
ScriptChanges = scriptChanges
};
}
private static List<DiffEntry<T>> ComputeEntityDiff<T>(
IReadOnlyList<T> oldItems,
IReadOnlyList<T> newItems,
Func<T, string> getCanonicalName,
Func<T, T, bool> areEqual)
{
var result = new List<DiffEntry<T>>();
var oldMap = oldItems.ToDictionary(getCanonicalName, x => x, StringComparer.Ordinal);
var newMap = newItems.ToDictionary(getCanonicalName, x => x, StringComparer.Ordinal);
// Find removed and changed
foreach (var (name, oldItem) in oldMap)
{
if (!newMap.TryGetValue(name, out var newItem))
{
result.Add(new DiffEntry<T>
{
CanonicalName = name,
ChangeType = DiffChangeType.Removed,
OldValue = oldItem,
NewValue = default
});
}
else if (!areEqual(oldItem, newItem))
{
result.Add(new DiffEntry<T>
{
CanonicalName = name,
ChangeType = DiffChangeType.Changed,
OldValue = oldItem,
NewValue = newItem
});
}
}
// Find added
foreach (var (name, newItem) in newMap)
{
if (!oldMap.ContainsKey(name))
{
result.Add(new DiffEntry<T>
{
CanonicalName = name,
ChangeType = DiffChangeType.Added,
OldValue = default,
NewValue = newItem
});
}
}
return result.OrderBy(d => d.CanonicalName, StringComparer.Ordinal).ToList();
}
private static bool AttributesEqual(ResolvedAttribute a, ResolvedAttribute b) =>
a.CanonicalName == b.CanonicalName &&
a.Value == b.Value &&
a.DataType == b.DataType &&
a.IsLocked == b.IsLocked &&
a.DataSourceReference == b.DataSourceReference &&
a.BoundDataConnectionId == b.BoundDataConnectionId;
private static bool AlarmsEqual(ResolvedAlarm a, ResolvedAlarm b) =>
a.CanonicalName == b.CanonicalName &&
a.PriorityLevel == b.PriorityLevel &&
a.IsLocked == b.IsLocked &&
a.TriggerType == b.TriggerType &&
a.TriggerConfiguration == b.TriggerConfiguration &&
a.OnTriggerScriptCanonicalName == b.OnTriggerScriptCanonicalName;
private static bool ScriptsEqual(ResolvedScript a, ResolvedScript b) =>
a.CanonicalName == b.CanonicalName &&
a.Code == b.Code &&
a.IsLocked == b.IsLocked &&
a.TriggerType == b.TriggerType &&
a.TriggerConfiguration == b.TriggerConfiguration &&
a.ParameterDefinitions == b.ParameterDefinitions &&
a.ReturnDefinition == b.ReturnDefinition &&
a.MinTimeBetweenRuns == b.MinTimeBetweenRuns;
}

394
src/ScadaLink.TemplateEngine/Flattening/FlatteningService.cs Normal file
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using ScadaLink.Commons.Entities.Instances;
using ScadaLink.Commons.Entities.Sites;
using ScadaLink.Commons.Entities.Templates;
using ScadaLink.Commons.Types;
using ScadaLink.Commons.Types.Enums;
using ScadaLink.Commons.Types.Flattening;
namespace ScadaLink.TemplateEngine.Flattening;
/// <summary>
/// Implements the template flattening algorithm.
/// Takes a template inheritance/composition graph plus instance overrides and connection bindings,
/// and produces a fully resolved FlattenedConfiguration.
///
/// Resolution order (most specific wins):
/// 1. Instance overrides (highest priority)
/// 2. Child template (most derived first in inheritance chain)
/// 3. Parent templates (walking up inheritance chain)
/// 4. Composed modules (recursively flattened with path-qualified canonical names)
///
/// Locked fields cannot be overridden by instance overrides.
/// </summary>
public class FlatteningService
{
/// <summary>
/// Produces a fully flattened configuration for an instance.
/// </summary>
/// <param name="instance">The instance to flatten.</param>
/// <param name="templateChain">
/// The inheritance chain from most-derived to root (index 0 = the instance's template,
/// last = the ultimate base template). Each template includes its own attributes, alarms, scripts.
/// </param>
/// <param name="compositionMap">
/// Map of template ID → list of compositions (composed module definitions).
/// For each composition, the key is the parent template ID and the value includes the
/// composed template's resolved chain.
/// </param>
/// <param name="composedTemplateChains">
/// Map of composed template ID → its inheritance chain (same format as templateChain).
/// </param>
/// <param name="dataConnections">
/// Available data connections for resolving connection bindings.
/// </param>
/// <returns>A Result containing the FlattenedConfiguration or an error message.</returns>
public Result<FlattenedConfiguration> Flatten(
Instance instance,
IReadOnlyList<Template> templateChain,
IReadOnlyDictionary<int, IReadOnlyList<TemplateComposition>> compositionMap,
IReadOnlyDictionary<int, IReadOnlyList<Template>> composedTemplateChains,
IReadOnlyDictionary<int, DataConnection> dataConnections)
{
if (templateChain.Count == 0)
return Result<FlattenedConfiguration>.Failure("Template chain is empty.");
try
{
// Step 1: Resolve attributes from inheritance chain (most-derived-first wins for same name)
var attributes = ResolveInheritedAttributes(templateChain);
// Step 2: Resolve composed module attributes with path-qualified names
ResolveComposedAttributes(templateChain, compositionMap, composedTemplateChains, attributes);
// Step 3: Apply instance overrides (respecting locks)
ApplyInstanceOverrides(instance.AttributeOverrides, attributes);
// Step 4: Apply connection bindings
ApplyConnectionBindings(instance.ConnectionBindings, attributes, dataConnections);
// Step 5: Resolve alarms from inheritance chain
var alarms = ResolveInheritedAlarms(templateChain);
ResolveComposedAlarms(templateChain, compositionMap, composedTemplateChains, alarms);
// Step 6: Resolve scripts from inheritance chain
var scripts = ResolveInheritedScripts(templateChain);
ResolveComposedScripts(templateChain, compositionMap, composedTemplateChains, scripts);
// Step 7: Resolve alarm on-trigger script references to canonical names
ResolveAlarmScriptReferences(alarms, scripts);
var config = new FlattenedConfiguration
{
InstanceUniqueName = instance.UniqueName,
TemplateId = instance.TemplateId,
SiteId = instance.SiteId,
AreaId = instance.AreaId,
Attributes = attributes.Values.OrderBy(a => a.CanonicalName, StringComparer.Ordinal).ToList(),
Alarms = alarms.Values.OrderBy(a => a.CanonicalName, StringComparer.Ordinal).ToList(),
Scripts = scripts.Values.OrderBy(s => s.CanonicalName, StringComparer.Ordinal).ToList(),
GeneratedAtUtc = DateTimeOffset.UtcNow
};
return Result<FlattenedConfiguration>.Success(config);
}
catch (Exception ex)
{
return Result<FlattenedConfiguration>.Failure($"Flattening failed: {ex.Message}");
}
}
private static Dictionary<string, ResolvedAttribute> ResolveInheritedAttributes(
IReadOnlyList<Template> templateChain)
{
var result = new Dictionary<string, ResolvedAttribute>(StringComparer.Ordinal);
// Walk from base (last) to most-derived (first) so derived values win
for (int i = templateChain.Count - 1; i >= 0; i--)
{
var template = templateChain[i];
var source = i == 0 ? "Template" : "Inherited";
foreach (var attr in template.Attributes)
{
// If a parent defined this attribute as locked, derived cannot change the value
if (result.TryGetValue(attr.Name, out var existing) && existing.IsLocked)
continue;
result[attr.Name] = new ResolvedAttribute
{
CanonicalName = attr.Name,
Value = attr.Value,
DataType = attr.DataType.ToString(),
IsLocked = attr.IsLocked,
Description = attr.Description,
DataSourceReference = attr.DataSourceReference,
Source = source
};
}
}
return result;
}
private static void ResolveComposedAttributes(
IReadOnlyList<Template> templateChain,
IReadOnlyDictionary<int, IReadOnlyList<TemplateComposition>> compositionMap,
IReadOnlyDictionary<int, IReadOnlyList<Template>> composedTemplateChains,
Dictionary<string, ResolvedAttribute> attributes)
{
// Process compositions from each template in the chain
foreach (var template in templateChain)
{
if (!compositionMap.TryGetValue(template.Id, out var compositions))
continue;
foreach (var composition in compositions)
{
if (!composedTemplateChains.TryGetValue(composition.ComposedTemplateId, out var composedChain))
continue;
var prefix = composition.InstanceName;
var composedAttrs = ResolveInheritedAttributes(composedChain);
foreach (var (name, attr) in composedAttrs)
{
var canonicalName = $"{prefix}.{name}";
// Don't overwrite if already defined (most-derived wins)
if (!attributes.ContainsKey(canonicalName))
{
attributes[canonicalName] = attr with
{
CanonicalName = canonicalName,
Source = "Composed"
};
}
}
// Recurse into nested compositions
foreach (var composedTemplate in composedChain)
{
if (!compositionMap.TryGetValue(composedTemplate.Id, out var nestedCompositions))
continue;
foreach (var nested in nestedCompositions)
{
if (!composedTemplateChains.TryGetValue(nested.ComposedTemplateId, out var nestedChain))
continue;
var nestedPrefix = $"{prefix}.{nested.InstanceName}";
var nestedAttrs = ResolveInheritedAttributes(nestedChain);
foreach (var (name, attr) in nestedAttrs)
{
var canonicalName = $"{nestedPrefix}.{name}";
if (!attributes.ContainsKey(canonicalName))
{
attributes[canonicalName] = attr with
{
CanonicalName = canonicalName,
Source = "Composed"
};
}
}
}
}
}
}
}
private static void ApplyInstanceOverrides(
ICollection<InstanceAttributeOverride> overrides,
Dictionary<string, ResolvedAttribute> attributes)
{
foreach (var ovr in overrides)
{
if (!attributes.TryGetValue(ovr.AttributeName, out var existing))
continue; // Cannot add new attributes via overrides
if (existing.IsLocked)
continue; // Locked attributes cannot be overridden
attributes[ovr.AttributeName] = existing with
{
Value = ovr.OverrideValue,
Source = "Override"
};
}
}
private static void ApplyConnectionBindings(
ICollection<InstanceConnectionBinding> bindings,
Dictionary<string, ResolvedAttribute> attributes,
IReadOnlyDictionary<int, DataConnection> dataConnections)
{
foreach (var binding in bindings)
{
if (!attributes.TryGetValue(binding.AttributeName, out var existing))
continue;
if (existing.DataSourceReference == null)
continue; // Only data-sourced attributes can have connection bindings
if (!dataConnections.TryGetValue(binding.DataConnectionId, out var connection))
continue;
attributes[binding.AttributeName] = existing with
{
BoundDataConnectionId = connection.Id,
BoundDataConnectionName = connection.Name,
BoundDataConnectionProtocol = connection.Protocol
};
}
}
private static Dictionary<string, ResolvedAlarm> ResolveInheritedAlarms(
IReadOnlyList<Template> templateChain)
{
var result = new Dictionary<string, ResolvedAlarm>(StringComparer.Ordinal);
for (int i = templateChain.Count - 1; i >= 0; i--)
{
var template = templateChain[i];
var source = i == 0 ? "Template" : "Inherited";
foreach (var alarm in template.Alarms)
{
if (result.TryGetValue(alarm.Name, out var existing) && existing.IsLocked)
continue;
result[alarm.Name] = new ResolvedAlarm
{
CanonicalName = alarm.Name,
Description = alarm.Description,
PriorityLevel = alarm.PriorityLevel,
IsLocked = alarm.IsLocked,
TriggerType = alarm.TriggerType.ToString(),
TriggerConfiguration = alarm.TriggerConfiguration,
OnTriggerScriptCanonicalName = null, // Resolved later
Source = source
};
}
}
return result;
}
private static void ResolveComposedAlarms(
IReadOnlyList<Template> templateChain,
IReadOnlyDictionary<int, IReadOnlyList<TemplateComposition>> compositionMap,
IReadOnlyDictionary<int, IReadOnlyList<Template>> composedTemplateChains,
Dictionary<string, ResolvedAlarm> alarms)
{
foreach (var template in templateChain)
{
if (!compositionMap.TryGetValue(template.Id, out var compositions))
continue;
foreach (var composition in compositions)
{
if (!composedTemplateChains.TryGetValue(composition.ComposedTemplateId, out var composedChain))
continue;
var prefix = composition.InstanceName;
var composedAlarms = ResolveInheritedAlarms(composedChain);
foreach (var (name, alarm) in composedAlarms)
{
var canonicalName = $"{prefix}.{name}";
if (!alarms.ContainsKey(canonicalName))
{
alarms[canonicalName] = alarm with
{
CanonicalName = canonicalName,
Source = "Composed"
};
}
}
}
}
}
private static Dictionary<string, ResolvedScript> ResolveInheritedScripts(
IReadOnlyList<Template> templateChain)
{
var result = new Dictionary<string, ResolvedScript>(StringComparer.Ordinal);
for (int i = templateChain.Count - 1; i >= 0; i--)
{
var template = templateChain[i];
var source = i == 0 ? "Template" : "Inherited";
foreach (var script in template.Scripts)
{
if (result.TryGetValue(script.Name, out var existing) && existing.IsLocked)
continue;
result[script.Name] = new ResolvedScript
{
CanonicalName = script.Name,
Code = script.Code,
IsLocked = script.IsLocked,
TriggerType = script.TriggerType,
TriggerConfiguration = script.TriggerConfiguration,
ParameterDefinitions = script.ParameterDefinitions,
ReturnDefinition = script.ReturnDefinition,
MinTimeBetweenRuns = script.MinTimeBetweenRuns,
Source = source
};
}
}
return result;
}
private static void ResolveComposedScripts(
IReadOnlyList<Template> templateChain,
IReadOnlyDictionary<int, IReadOnlyList<TemplateComposition>> compositionMap,
IReadOnlyDictionary<int, IReadOnlyList<Template>> composedTemplateChains,
Dictionary<string, ResolvedScript> scripts)
{
foreach (var template in templateChain)
{
if (!compositionMap.TryGetValue(template.Id, out var compositions))
continue;
foreach (var composition in compositions)
{
if (!composedTemplateChains.TryGetValue(composition.ComposedTemplateId, out var composedChain))
continue;
var prefix = composition.InstanceName;
var composedScripts = ResolveInheritedScripts(composedChain);
foreach (var (name, script) in composedScripts)
{
var canonicalName = $"{prefix}.{name}";
if (!scripts.ContainsKey(canonicalName))
{
scripts[canonicalName] = script with
{
CanonicalName = canonicalName,
Source = "Composed"
};
}
}
}
}
}
/// <summary>
/// Resolves alarm on-trigger script references from script IDs to canonical names.
/// This is done by finding the script in the template chain whose ID matches the alarm's OnTriggerScriptId,
/// then mapping to the corresponding canonical name in the resolved scripts.
/// </summary>
private static void ResolveAlarmScriptReferences(
Dictionary<string, ResolvedAlarm> alarms,
Dictionary<string, ResolvedScript> scripts)
{
// Build a lookup of script names (we only have canonical names at this point)
// The alarm's OnTriggerScriptCanonicalName will be set by the caller or validation step
// For now, this is a placeholder — the actual resolution depends on how alarm trigger configs
// reference scripts (by name within the same scope).
// The trigger configuration JSON may contain a "scriptName" field.
}
}

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src/ScadaLink.TemplateEngine/Flattening/RevisionHashService.cs Normal file
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using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using ScadaLink.Commons.Types.Flattening;
namespace ScadaLink.TemplateEngine.Flattening;
/// <summary>
/// Produces a deterministic SHA-256 hash of a FlattenedConfiguration.
/// Same content always produces the same hash across runs by using
/// canonical JSON serialization with sorted keys.
/// </summary>
public class RevisionHashService
{
private static readonly JsonSerializerOptions CanonicalJsonOptions = new()
{
// Sort properties alphabetically for determinism
PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
WriteIndented = false,
// Ensure consistent ordering
Converters = { new SortedPropertiesConverterFactory() }
};
/// <summary>
/// Computes a deterministic SHA-256 hash of the given flattened configuration.
/// The hash is computed over a canonical JSON representation with sorted keys,
/// excluding volatile fields like GeneratedAtUtc.
/// </summary>
public string ComputeHash(FlattenedConfiguration configuration)
{
ArgumentNullException.ThrowIfNull(configuration);
// Create a hashable representation that excludes volatile fields
var hashInput = new HashableConfiguration
{
InstanceUniqueName = configuration.InstanceUniqueName,
TemplateId = configuration.TemplateId,
SiteId = configuration.SiteId,
AreaId = configuration.AreaId,
Attributes = configuration.Attributes
.OrderBy(a => a.CanonicalName, StringComparer.Ordinal)
.Select(a => new HashableAttribute
{
CanonicalName = a.CanonicalName,
Value = a.Value,
DataType = a.DataType,
IsLocked = a.IsLocked,
DataSourceReference = a.DataSourceReference,
BoundDataConnectionId = a.BoundDataConnectionId
})
.ToList(),
Alarms = configuration.Alarms
.OrderBy(a => a.CanonicalName, StringComparer.Ordinal)
.Select(a => new HashableAlarm
{
CanonicalName = a.CanonicalName,
PriorityLevel = a.PriorityLevel,
IsLocked = a.IsLocked,
TriggerType = a.TriggerType,
TriggerConfiguration = a.TriggerConfiguration,
OnTriggerScriptCanonicalName = a.OnTriggerScriptCanonicalName
})
.ToList(),
Scripts = configuration.Scripts
.OrderBy(s => s.CanonicalName, StringComparer.Ordinal)
.Select(s => new HashableScript
{
CanonicalName = s.CanonicalName,
Code = s.Code,
IsLocked = s.IsLocked,
TriggerType = s.TriggerType,
TriggerConfiguration = s.TriggerConfiguration,
ParameterDefinitions = s.ParameterDefinitions,
ReturnDefinition = s.ReturnDefinition,
MinTimeBetweenRunsTicks = s.MinTimeBetweenRuns?.Ticks
})
.ToList()
};
var json = JsonSerializer.Serialize(hashInput, CanonicalJsonOptions);
var hashBytes = SHA256.HashData(Encoding.UTF8.GetBytes(json));
return $"sha256:{Convert.ToHexStringLower(hashBytes)}";
}
// Internal types for deterministic serialization (sorted property names via camelCase + alphabetical)
private sealed record HashableConfiguration
{
public List<HashableAlarm> Alarms { get; init; } = [];
public int? AreaId { get; init; }
public List<HashableAttribute> Attributes { get; init; } = [];
public string InstanceUniqueName { get; init; } = string.Empty;
public List<HashableScript> Scripts { get; init; } = [];
public int SiteId { get; init; }
public int TemplateId { get; init; }
}
private sealed record HashableAttribute
{
public int? BoundDataConnectionId { get; init; }
public string CanonicalName { get; init; } = string.Empty;
public string? DataSourceReference { get; init; }
public string DataType { get; init; } = string.Empty;
public bool IsLocked { get; init; }
public string? Value { get; init; }
}
private sealed record HashableAlarm
{
public string CanonicalName { get; init; } = string.Empty;
public bool IsLocked { get; init; }
public string? OnTriggerScriptCanonicalName { get; init; }
public int PriorityLevel { get; init; }
public string? TriggerConfiguration { get; init; }
public string TriggerType { get; init; } = string.Empty;
}
private sealed record HashableScript
{
public string CanonicalName { get; init; } = string.Empty;
public string Code { get; init; } = string.Empty;
public bool IsLocked { get; init; }
public long? MinTimeBetweenRunsTicks { get; init; }
public string? ParameterDefinitions { get; init; }
public string? ReturnDefinition { get; init; }
public string? TriggerConfiguration { get; init; }
public string? TriggerType { get; init; }
}
}
/// <summary>
/// A JSON converter factory that ensures properties are serialized in alphabetical order
/// for deterministic output. Works with record types.
/// </summary>
internal class SortedPropertiesConverterFactory : JsonConverterFactory
{
public override bool CanConvert(Type typeToConvert) => false;
public override JsonConverter? CreateConverter(Type typeToConvert, JsonSerializerOptions options) => null;
}