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Load NLog config from appsettings.json using NLogLoggingConfiguration
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108 changes: 108 additions & 0 deletions
108
src/NLog.Extensions.Logging/Config/NLogLoggingConfiguration.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using Microsoft.Extensions.Configuration; | ||
| using NLog.Config; | ||
|
|
||
| namespace NLog.Extensions.Logging | ||
| { | ||
| /// <summary> | ||
| /// Configures NLog through Microsoft Extension Configuration section (Ex from appsettings.json) | ||
| /// </summary> | ||
| public class NLogLoggingConfiguration : LoggingConfigurationParser | ||
| { | ||
| private readonly Action<Object> _reloadConfiguration; | ||
|
|
||
| private class LoggingConfigurationElement : ILoggingConfigurationElement | ||
| { | ||
| readonly IConfigurationSection _configurationSection; | ||
| readonly string _nameOverride; | ||
|
|
||
| public bool AutoReload { get; private set; } | ||
|
|
||
| public LoggingConfigurationElement(IConfigurationSection configurationSection, bool topElement, string nameOverride = null) | ||
| { | ||
| _configurationSection = configurationSection; | ||
| _nameOverride = nameOverride; | ||
| if (topElement && bool.TryParse(configurationSection["autoreload"], out bool autoreload)) | ||
| { | ||
| AutoReload = autoreload; | ||
| } | ||
| } | ||
|
|
||
| public string Name => _nameOverride ?? _configurationSection.Key; | ||
|
|
||
| public IEnumerable<KeyValuePair<string, string>> Values | ||
| { | ||
| get | ||
| { | ||
| var children = _configurationSection.GetChildren(); | ||
| foreach (var child in children) | ||
| { | ||
| if (!child.GetChildren().Any()) | ||
| yield return new KeyValuePair<string, string>(child.Key, child.Value); | ||
| } | ||
| if (_nameOverride != null) | ||
| yield return new KeyValuePair<string, string>("name", _configurationSection.Key); | ||
| } | ||
| } | ||
|
|
||
| public IEnumerable<ILoggingConfigurationElement> Children | ||
| { | ||
| get | ||
| { | ||
| var children = _configurationSection.GetChildren(); | ||
| foreach (var child in children) | ||
| { | ||
| var firstChildValue = child?.GetChildren()?.FirstOrDefault(); | ||
| if (firstChildValue != null) | ||
| { | ||
| if (_nameOverride == "target" && string.Equals(child.Key, "target", StringComparison.OrdinalIgnoreCase) && child.GetChildren().Count() == 1) | ||
| { | ||
| yield return new LoggingConfigurationElement(firstChildValue, false, "target"); | ||
| } | ||
| else | ||
| { | ||
| string nameOverride = null; | ||
| if (string.Equals(_configurationSection.Key, "targets", StringComparison.OrdinalIgnoreCase)) | ||
| nameOverride = "target"; | ||
| yield return new LoggingConfigurationElement(child, false, nameOverride); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="NLogLoggingConfiguration"/> class. | ||
| /// </summary> | ||
| /// <param name="nlogConfig">Configuration section to be read</param> | ||
| public NLogLoggingConfiguration(IConfigurationSection nlogConfig) | ||
| : this(nlogConfig, NLog.LogManager.LogFactory) | ||
| { | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="NLogLoggingConfiguration"/> class. | ||
| /// </summary> | ||
| /// <param name="nlogConfig">Configuration section to be read</param> | ||
| /// <param name="logFactory">The <see cref="LogFactory"/> to which to apply any applicable configuration values.</param> | ||
| public NLogLoggingConfiguration(IConfigurationSection nlogConfig, LogFactory logFactory) | ||
| : base(logFactory) | ||
| { | ||
| _reloadConfiguration = (state) => LoadConfigurationSection((IConfigurationSection)state, true); | ||
| LoadConfigurationSection(nlogConfig, null); | ||
| } | ||
|
|
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| private void LoadConfigurationSection(IConfigurationSection nlogConfig, bool? autoReload) | ||
| { | ||
| var configElement = new LoggingConfigurationElement(nlogConfig, true); | ||
| LoadConfig(configElement, null); | ||
| if (autoReload ?? configElement.AutoReload) | ||
| { | ||
| nlogConfig.GetReloadToken().RegisterChangeCallback(_reloadConfiguration, nlogConfig); | ||
| } | ||
| } | ||
| } | ||
| } |
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