Adds config setting for composable functions generation (#552)

* Generate nav. props of composable functions based on depth setting

* Add config setting for controlling depth of composable fxns expansion

* Update tests

* Update release note

* PR review suggestion

Author: irvinesunday

src/Microsoft.OpenApi.OData.Reader/Edm/ODataPathProvider.cs

@@ -888,11 +888,32 @@ private void RetrieveBoundOperationPaths(OpenApiConvertSettings convertSettings)
                     continue;
                 }
 
+                ODataSegment secondLastSeg = functionPath.ElementAt(functionPath.Count - 2);
+                if (convertSettings.ComposableFunctionsExpansionDepth < 2 &&
+                            functionPath.LastSegment is ODataOperationSegment &&
+                            secondLastSeg is ODataOperationSegment)
+                {
+                    // Only one level of composable functions expansion allowed
+                    continue;
+                }
+
                 foreach (var navProperty in returnBindingEntityType.NavigationProperties())
                 {
-                    ODataPath newNavigationPath = functionPath.Clone();
-                    newNavigationPath.Push(new ODataNavigationPropertySegment(navProperty));
-                    AppendPath(newNavigationPath);
+                    /* Get number of segments already appended after the first composable function segment
+                     */
+                    int composableFuncSegIndex = functionPath.Segments.IndexOf(
+                        functionPath.Segments.FirstOrDefault(
+                            x => x is ODataOperationSegment operationSegment &&
+                            operationSegment.Operation is IEdmFunction edmFunction &&
+                            edmFunction.IsComposable));                   
+                    int currentDepth = functionPath.Count - composableFuncSegIndex - 1;
+
+                    if (currentDepth < convertSettings.ComposableFunctionsExpansionDepth)
+                    {
+                        ODataPath newNavigationPath = functionPath.Clone();
+                        newNavigationPath.Push(new ODataNavigationPropertySegment(navProperty));
+                        AppendPath(newNavigationPath);
+                    }                   
                 }
             }
         }
@@ -1171,6 +1192,12 @@ private void AppendBoundOperationOnOperationPath(IEdmOperation edmOperation, boo
                     continue;
                 }
 
+                var segName = path.LastSegment as ODataOperationSegment;
+                if (edmOperation.Name.Equals(segName?.Identifier))
+                {
+                    continue;
+                }
+
                 ODataPath newOperationPath = path.Clone();
                 newOperationPath.Push(new ODataOperationSegment(edmOperation, isEscapedFunction, _model));
                 AppendPath(newOperationPath);

src/Microsoft.OpenApi.OData.Reader/Microsoft.OpenAPI.OData.Reader.csproj

@@ -15,13 +15,13 @@
     <TargetFrameworks>netstandard2.0</TargetFrameworks>
     <PackageId>Microsoft.OpenApi.OData</PackageId>
     <SignAssembly>true</SignAssembly>
-    <Version>1.6.7</Version>
+    <Version>1.6.8</Version>
     <Description>This package contains the codes you need to convert OData CSDL to Open API Document of Model.</Description>
     <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
     <PackageTags>Microsoft OpenApi OData EDM</PackageTags>
     <RepositoryUrl>https://github.com/Microsoft/OpenAPI.NET.OData</RepositoryUrl>
     <PackageReleaseNotes>
-		- Fixes empty response objects for OData type cast paths. #546
+		- Adds support for configuring composable functions generations #551
 	</PackageReleaseNotes>
     <AssemblyName>Microsoft.OpenApi.OData.Reader</AssemblyName>
     <AssemblyOriginatorKeyFile>..\..\tool\Microsoft.OpenApi.OData.snk</AssemblyOriginatorKeyFile>

src/Microsoft.OpenApi.OData.Reader/OpenApiConvertSettings.cs

@@ -362,6 +362,11 @@ public bool ExpandDerivedTypesNavigationProperties
         /// </summary>
         public bool UseStringArrayForQueryOptionsSchema { get; set; } = true;
 
+        /// <summary>
+        /// Gets/Sets a value indicating the depth to expand composable functions.
+        /// </summary>
+        public int ComposableFunctionsExpansionDepth { get; set; } = 1;
+
         internal OpenApiConvertSettings Clone()
         {
             var newSettings = new OpenApiConvertSettings
@@ -416,7 +421,8 @@ internal OpenApiConvertSettings Clone()
                 EnableAliasForTypeCastSegments = this.EnableAliasForTypeCastSegments,
                 SemVerVersion = this.SemVerVersion,
                 EnableAliasForOperationSegments = this.EnableAliasForOperationSegments,
-                UseStringArrayForQueryOptionsSchema = this.UseStringArrayForQueryOptionsSchema
+                UseStringArrayForQueryOptionsSchema = this.UseStringArrayForQueryOptionsSchema,
+                ComposableFunctionsExpansionDepth = this.ComposableFunctionsExpansionDepth
             };
 
             return newSettings;

src/Microsoft.OpenApi.OData.Reader/PublicAPI.Unshipped.txt

@@ -21,6 +21,8 @@ Microsoft.OpenApi.OData.OpenApiConvertSettings.AddEnumFlagsExtension.get -> bool
 Microsoft.OpenApi.OData.OpenApiConvertSettings.AddEnumFlagsExtension.set -> void
 Microsoft.OpenApi.OData.OpenApiConvertSettings.AppendBoundOperationsOnDerivedTypeCastSegments.get -> bool
 Microsoft.OpenApi.OData.OpenApiConvertSettings.AppendBoundOperationsOnDerivedTypeCastSegments.set -> void
+Microsoft.OpenApi.OData.OpenApiConvertSettings.ComposableFunctionsExpansionDepth.get -> int
+Microsoft.OpenApi.OData.OpenApiConvertSettings.ComposableFunctionsExpansionDepth.set -> void
 Microsoft.OpenApi.OData.OpenApiConvertSettings.CustomHttpMethodLinkRelMapping.get -> System.Collections.Generic.Dictionary<Microsoft.OpenApi.OData.Vocabulary.Core.LinkRelKey, string>
 Microsoft.OpenApi.OData.OpenApiConvertSettings.CustomHttpMethodLinkRelMapping.set -> void
 Microsoft.OpenApi.OData.OpenApiConvertSettings.EnableAliasForOperationSegments.get -> bool

test/Microsoft.OpenAPI.OData.Reader.Tests/Edm/ODataPathProviderTests.cs

@@ -52,7 +52,7 @@ public void GetPathsForGraphBetaModelReturnsAllPaths()
 
             // Assert
             Assert.NotNull(paths);
-            Assert.Equal(16980, paths.Count());
+            Assert.Equal(15210, paths.Count());
             AssertGraphBetaModelPaths(paths);
         }
 
@@ -117,7 +117,7 @@ public void GetPathsForGraphBetaModelWithDerivedTypesConstraintReturnsAllPaths()
 
             // Assert
             Assert.NotNull(paths);
-            Assert.Equal(17631, paths.Count());
+            Assert.Equal(15861, paths.Count());
         }
 
         [Theory]
@@ -208,9 +208,9 @@ public void GetPathsForComposableFunctionsReturnsAllPaths()
 
             // Assert
             Assert.NotNull(paths);
-            Assert.Equal(38, paths.Count());
-            Assert.Equal(20, paths.Where(p => p.LastSegment is ODataOperationSegment).Count());
-            Assert.Equal(12, paths.Where(p => p.Segments.Count > 1 && p.LastSegment is ODataNavigationPropertySegment && p.Segments[p.Segments.Count - 2] is ODataOperationSegment).Count());
+            Assert.Equal(26, paths.Count());
+            Assert.Equal(17, paths.Where(p => p.LastSegment is ODataOperationSegment).Count());
+            Assert.Equal(3, paths.Where(p => p.Segments.Count > 1 && p.LastSegment is ODataNavigationPropertySegment && p.Segments[p.Segments.Count - 2] is ODataOperationSegment).Count());
         }
 
         [Fact]