public void Implementation()
{
var path = Input;
Span <PathSegment> segments = stackalloc PathSegment[MaxCount];
FastPathTokenizer.Tokenize(path, segments);
}
public void Tokenize_RootPath()
{
// Arrange
Span <PathSegment> segments = stackalloc PathSegment[1];
// Act
var count = FastPathTokenizer.Tokenize("/", segments);
// Assert
Assert.Equal(0, count);
}
public void Tokenize_SingleSegment()
{
// Arrange
Span <PathSegment> segments = stackalloc PathSegment[1];
// Act
var count = FastPathTokenizer.Tokenize("/abc", segments);
// Assert
Assert.Equal(1, count);
Assert.Equal(new PathSegment(1, 3), segments[0]);
}
public void Tokenize_LongerSegments()
{
// Arrange
Span <PathSegment> segments = stackalloc PathSegment[3];
// Act
var count = FastPathTokenizer.Tokenize("/aaa/bb/ccccc", segments);
// Assert
Assert.Equal(3, count);
Assert.Equal(new PathSegment(1, 3), segments[0]);
Assert.Equal(new PathSegment(5, 2), segments[1]);
Assert.Equal(new PathSegment(8, 5), segments[2]);
}
[Fact] // Empty trailing / is ignored
public void Tokenize_WithSomeSegments_TrailingSlash()
{
// Arrange
Span <PathSegment> segments = stackalloc PathSegment[3];
// Act
var count = FastPathTokenizer.Tokenize("/a/b/c/", segments);
// Assert
Assert.Equal(3, count);
Assert.Equal(new PathSegment(1, 1), segments[0]);
Assert.Equal(new PathSegment(3, 1), segments[1]);
Assert.Equal(new PathSegment(5, 1), segments[2]);
}
public void Tokenize_TooManySegments()
{
// Arrange
Span <PathSegment> segments = stackalloc PathSegment[3];
// Act
var count = FastPathTokenizer.Tokenize("/a/b/c/d", segments);
// Assert
Assert.Equal(3, count);
Assert.Equal(new PathSegment(1, 1), segments[0]);
Assert.Equal(new PathSegment(3, 1), segments[1]);
Assert.Equal(new PathSegment(5, 1), segments[2]);
}
public void Tokenize_EmptySegments()
{
// Arrange
Span <PathSegment> segments = stackalloc PathSegment[3];
// Act
var count = FastPathTokenizer.Tokenize("///c", segments);
// Assert
Assert.Equal(3, count);
Assert.Equal(new PathSegment(1, 0), segments[0]);
Assert.Equal(new PathSegment(2, 0), segments[1]);
Assert.Equal(new PathSegment(3, 1), segments[2]);
}
public sealed override Task MatchAsync(ProtoContext httpContext, EndpointSelectorContext context)
{
if (httpContext == null)
{
throw new ArgumentNullException(nameof(httpContext));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
// All of the logging we do here is at level debug, so we can get away with doing a single check.
var log = _logger.IsEnabled(LogLevel.Debug);
// The sequence of actions we take is optimized to avoid doing expensive work
// like creating substrings, creating route value dictionaries, and calling
// into policies like versioning.
var path = httpContext.Request.Path.Value;
// First tokenize the path into series of segments.
Span <PathSegment> buffer = stackalloc PathSegment[_maxSegmentCount];
var count = FastPathTokenizer.Tokenize(path, buffer);
var segments = buffer.Slice(0, count);
// FindCandidateSet will process the DFA and return a candidate set. This does
// some preliminary matching of the URL (mostly the literal segments).
var(candidates, policies) = FindCandidateSet(httpContext, path, segments);
if (candidates.Length == 0)
{
if (log)
{
Logger.CandidatesNotFound(_logger, path);
}
return(Task.CompletedTask);
}
if (log)
{
Logger.CandidatesFound(_logger, path, candidates);
}
// At this point we have a candidate set, defined as a list of endpoints in
// priority order.
//
// We don't yet know that any candidate can be considered a match, because
// we haven't processed things like route constraints and complex segments.
//
// Now we'll iterate each endpoint to capture route values, process constraints,
// and process complex segments.
// `candidates` has all of our internal state that we use to process the
// set of endpoints before we call the EndpointSelector.
//
// `candidateSet` is the mutable state that we pass to the EndpointSelector.
var candidateSet = new CandidateSet(candidates);
for (var i = 0; i < candidates.Length; i++)
{
// PERF: using ref here to avoid copying around big structs.
//
// Reminder!
// candidate: readonly data about the endpoint and how to match
// state: mutable storarge for our processing
ref var candidate = ref candidates[i];
ref var state = ref candidateSet[i];