/// <summary>
/// Attempts to parse a name-value pair from the context's Input
/// property. This is the last function in the pipeline, so it never
/// invokes the specified next function.
/// </summary>
public static Task ParseSetting(ParseContext context, Func <Task> next)
{
const int SettingName = 0;
const int SettingValue = 1;
const int MaxSubstrings = 2;
RequiresArgument.NotNull(context, "context");
RequiresArgument.NotNull(next, "next");
var arr = context
.Input
// We only want to split on the first colon, so the maximum
//number of resulting substrings is limited to two.
.Split(new[] { ':' }, MaxSubstrings)
.Select(x => x.Trim())
.ToArray();
RequiresArgument.LengthEquals(arr, MaxSubstrings, "Settings must have a name and value. For example: MyFavoriteColor: Red");
RequiresArgument.NotNullOrWhiteSpace(arr[SettingName], "Setting name");
RequiresArgument.NotNullOrWhiteSpace(arr[SettingValue], "Setting value");
// Using reflection to find parsed setting on the context's state
// and set its value.
var field = context.State.GetType().GetRuntimeField(arr[SettingName]);
RequiresSettingExists(field, arr[SettingName]);
field.SetValue(context.State, arr[SettingValue]);
return(Task.CompletedTask);
}
/// <summary>
/// Adds a function to the pipeline. Functions are invoked in the
/// order in which they are added.
/// </summary>
public Pipeline <TContext> Use(Func <TContext, Func <Task>, Task> step)
{
RequiresArgument.NotNull(step, "step");
steps.Add(step);
return(this);
}
/// <summary>
/// Reads the next line context's StreamReader, and stores it on the
/// context's Input property before calling the next function in the
/// pipeline.
/// </summary>
public static Task ReadLine(ParseContext context, Func <Task> next)
{
RequiresArgument.NotNull(context, "context");
RequiresArgument.NotNull(next, "next");
context.Input = context.Reader.ReadLine().Trim();
return(next());
}
public ParseContext(StreamReader reader, object state)
{
RequiresArgument.NotNull(reader, "reader");
RequiresArgument.NotNull(state, "state");
Reader = reader;
State = state;
}
/// <summary>
/// Makes the response a INTERNAL SERVER ERROR (500) and writes the
/// exception information to it.
public static Task InternalServerError(this HttpResponse response, Exception ex)
{
RequiresArgument.NotNull(ex, "ex");
response.StatusCode = 500;
response.ContentType = "text/plain";
var msg = BuildExceptionMessage(ex);
return(response.WriteAsync(msg));
}
/// <summary>
/// Stops the current pass through the pipeline when the context's
/// Input property is NULL, white space, or a comment, e.g. "#
/// Comments begin with a hash mark".
/// </summary>
public static Task IgnoreCommentsAndBlankLines(ParseContext context, Func <Task> next)
{
RequiresArgument.NotNull(context, "context");
RequiresArgument.NotNull(next, "next");
if (string.IsNullOrWhiteSpace(context.Input) || context.Input.StartsWith("#"))
{
return(Task.CompletedTask);
}
else
{
return(next());
}
}
/// <summary>
/// When the context's Input is "# Body", reads the rest of the text
/// from the context's StreamReader and interpret's it as the desired
/// response body for the virtual service being defined.
/// </summary>
public static Task ParseBody(ParseContext context, Func <Task> next)
{
RequiresArgument.NotNull(context, "context");
RequiresArgument.NotNull(next, "next");
if (context.Input == ("# Body"))
{
var field = context.State.GetType().GetRuntimeField("Body");
field.SetValue(context.State, context.Reader.ReadToEnd());
return(Task.CompletedTask);
}
else
{
return(next());
}
}
