private bool GetEnv(NodeEvent node, IParser reader, Type expectedType, Func <IParser, Type, object> nestedObjectDeserializer, out object value)
{
if (node is Scalar scalar)
{
// deserialize single parameter
INodeDeserializer nested = new ScalarNodeDeserializer();
if (nested.Deserialize(reader, expectedType, nestedObjectDeserializer, out value) && (value is string key))
{
value = Environment.GetEnvironmentVariable(key);
return(true);
}
}
else
{
LogError("invalid expression for !GetEnv", null);
}
value = null;
return(false);
}
private bool GetParam(NodeEvent node, IParser reader, Type expectedType, Func <IParser, Type, object> nestedObjectDeserializer, out object value)
{
if (node is Scalar scalar)
{
// NOTE: !GetParam parameterKey
// deserialize single parameter
INodeDeserializer nested = new ScalarNodeDeserializer();
if (
nested.Deserialize(reader, expectedType, nestedObjectDeserializer, out var tagValue) &&
(tagValue is string parameterKey)
)
{
if (Dictionary.TryGetValue(parameterKey, out var parameterValue))
{
// substitute expression with parameter value
value = parameterValue;
}
else
{
// record missing parameter key
Dictionary[parameterKey] = null;
value = null;
}
return(true);
}
}
else if (node is SequenceStart sequenceStart)
{
// NOTE: !GetParam [ parameterKey, encryptionKey ]
// deserialize parameter list
INodeDeserializer nested = new CollectionNodeDeserializer(new DefaultObjectFactory());
if (
nested.Deserialize(reader, expectedType, nestedObjectDeserializer, out var tagValue) &&
(tagValue is IList list)
)
{
if (list.Count == 1)
{
if (list[0] is string parameterKey)
{
if (Dictionary.TryGetValue(parameterKey, out var parameterValue))
{
// substitute expression with parameter value
value = parameterValue;
}
else
{
// record missing parameter key
Dictionary[parameterKey] = null;
value = null;
}
return(true);
}
else
{
LogError("invalid expression for !GetParam [ parameterKey ]", null);
}
}
else if (list.Count == 2)
{
if (
(list[0] is string parameterKey) &&
(list[1] is string encryptionKey)
)
{
if (Dictionary.TryGetValue(parameterKey, out var parameterValue))
{
// substitute expression with parameter value
value = parameterValue;
}
else
{
// record missing parameter key
Dictionary[parameterKey] = null;
Encryption[parameterKey] = encryptionKey;
value = null;
}
return(true);
}
else
{
LogError("invalid expression for !GetParam [ parameterKey, encryptionKey ]", null);
}
}
}
else
{
LogError("!GetParam must be followed by either a list or a string", null);
}
}
public WidthConverter()
{
arrayNodeDeserializer = new ArrayNodeDeserializer();
scalarNodeDeserializer = new ScalarNodeDeserializer();
}
//--- Methods ---
public bool Deserialize(IParser reader, Type expectedType, Func <IParser, Type, object> nestedObjectDeserializer, out object value)
{
if (reader.Current is NodeEvent node)
{
switch (node.Tag)
{
case "!GetConfig": {
if (node is SequenceStart sequenceStart)
{
// deserialize single parameter
INodeDeserializer nested = new CollectionNodeDeserializer(new DefaultObjectFactory());
if (
nested.Deserialize(reader, expectedType, nestedObjectDeserializer, out value) &&
(value is IList list) &&
(list.Count == 2) &&
(list[0] is string sourceFile) &&
(list[1] is string key)
)
{
if (!_configFiles.TryGetValue(sourceFile, out var configFile))
{
try {
configFile = JObject.Parse(File.ReadAllText(Path.Combine(_workingDirectory, sourceFile)));
_configFiles[sourceFile] = configFile;
} catch (FileNotFoundException) {
LogError($"unable to load json config file '{configFile}'", null);
value = null;
return(true);
}
}
try {
value = configFile.SelectToken(key)?.Value <string>();
} catch (Exception e) {
LogError($"!GetConfig has invalid JSON-path expression: '{key}'", e);
value = null;
return(true);
}
if (value == null)
{
LogError($"!GetConfig unable to find '{key}' in file '{sourceFile}'", null);
return(true);
}
return(true);
}
}
}
break;
case "!GetEnv": {
if (node is Scalar scalar)
{
// deserialize single parameter
INodeDeserializer nested = new ScalarNodeDeserializer();
if (nested.Deserialize(reader, expectedType, nestedObjectDeserializer, out value) && (value is string key))
{
value = Environment.GetEnvironmentVariable(key);
return(true);
}
}
}
break;
case "!GetParam": {
if (node is Scalar scalar)
{
// deserialize single parameter
INodeDeserializer nested = new ScalarNodeDeserializer();
if (nested.Deserialize(reader, expectedType, nestedObjectDeserializer, out value) && (value is string key))
{
if (Dictionary.TryGetValue(key, out var parameterValue))
{
// substitute expression with parameter value
value = parameterValue;
}
else
{
// record missing parameter key
Dictionary[key] = null;
value = null;
}
return(true);
}
}
}
break;
}
}
value = null;
return(false);
}
