add the LoggingTemplateMissingValuesAnalyzer

CHANGELOG.md

@@ -9,6 +9,7 @@
 * Add editor support to all analyzers. [#50](https://github.com/G-Research/fsharp-analyzers/pull/50)
 * Add fix to VirtualCall Analyzer. [#51](https://github.com/G-Research/fsharp-analyzers/pull/51)
 * Add fix to UnionCaseAnalyzer. [#51](https://github.com/G-Research/fsharp-analyzers/pull/51)
+* Add new LoggingTemplateMissingValuesAnalyzer. [#53](https://github.com/G-Research/fsharp-analyzers/pull/53)
 
 ### Changed
 * Update FSharp.Analyzers.SDK to `0.23.0`. [#51](https://github.com/G-Research/fsharp-analyzers/pull/45)

docs/analyzers/LoggingTemplateMissingValuesAnalyzer.md

@@ -0,0 +1,30 @@
+---
+title: LoggingTemplateMissingValuesAnalyzer
+category: analyzers
+categoryindex: 1
+index: 10
+---
+
+# LoggingTemplateMissingValuesAnalyzer
+
+## Problem
+
+As param arrays are loosely typed it's easy to miss an expected templated value or even give too many.
+
+```fsharp
+do
+    use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+    let logger: ILogger = factory.CreateLogger("Program")
+    logger.Log(LogLevel.Information, "first {one} second {two}", 23)
+```
+
+## Fix
+
+Provide the correct number of values:
+
+```fsharp
+do
+    use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+    let logger: ILogger = factory.CreateLogger("Program")
+    logger.Log(LogLevel.Information, "first {one} second {two}", 23, 42)
+```

src/FSharp.Analyzers/FSharp.Analyzers.fsproj

@@ -24,6 +24,7 @@
     <Compile Include="VirtualCallAnalyzer.fs" />
     <Compile Include="LoggingArgFuncNotFullyAppliedAnalyzer.fsi" />
     <Compile Include="LoggingArgFuncNotFullyAppliedAnalyzer.fs" />
+    <Compile Include="LoggingTemplateMissingValuesAnalyzer.fs" />
     <Compile Include="TypeAnnotateStringFunctionAnalyzer.fs" />
     <Compile Include="ImmutableCollectionEqualityAnalyzer.fs" />
     <Compile Include="TypedInterpolatedStringsAnalyzer.fs" />

src/FSharp.Analyzers/LoggingTemplateMissingValuesAnalyzer.fs

@@ -0,0 +1,121 @@
+module GR.FSharp.Analyzers.LoggingTemplateMissingValuesAnalyzer
+
+open System
+open System.Text.RegularExpressions
+open FSharp.Analyzers.SDK
+open FSharp.Analyzers.SDK.TASTCollecting
+open FSharp.Compiler.Symbols
+open FSharp.Compiler.Symbols.FSharpExprPatterns
+open FSharp.Compiler.Text
+
+[<Literal>]
+let Code = "GRA-LOGTEMPLMISSVALS-001"
+
+let (|StringConst|_|) (e : FSharpExpr) =
+    let name = e.Type.ErasedType.TypeDefinition.TryGetFullName ()
+
+    match name, e with
+    | Some ("System.String"), Const (o, _type) when not (isNull o) -> Some (string o)
+    | _ -> None
+
+
+let analyze (typedTree : FSharpImplementationFileContents) =
+    let state = ResizeArray<range> ()
+
+    let namesToWarnAbout =
+        set
+            [
+                "Microsoft.Extensions.Logging.LoggerExtensions.Log"
+                "Microsoft.Extensions.Logging.LoggerExtensions.LogCritical"
+                "Microsoft.Extensions.Logging.LoggerExtensions.LogDebug"
+                "Microsoft.Extensions.Logging.LoggerExtensions.LogError"
+                "Microsoft.Extensions.Logging.LoggerExtensions.LogInformation"
+                "Microsoft.Extensions.Logging.LoggerExtensions.LogTrace"
+                "Microsoft.Extensions.Logging.LoggerExtensions.LogWarning"
+            ]
+
+    let pattern = @"(?<opening>{+)[a-zA-Z0-9]*(?<closing>}+)"
+    let regex = Regex (pattern)
+
+    let walker =
+        { new TypedTreeCollectorBase() with
+            override _.WalkCall _ (m : FSharpMemberOrFunctionOrValue) _ _ (args : FSharpExpr list) (range : range) =
+                let name = String.Join (".", m.DeclaringEntity.Value.FullName, m.DisplayName)
+                let assemblyName = "Microsoft.Extensions.Logging.Abstractions"
+
+                let provided =
+                    if args.Length >= 2 then
+                        match List.tryLast args with
+                        | Some (NewArray (_type, exprs)) -> List.length exprs
+                        | _ -> 0
+                    else
+                        0
+
+                let expected =
+                    let logString =
+                        args
+                        |> List.tryPick (
+                            function
+                            | StringConst (s) -> Some s
+                            | _ -> None
+                        )
+
+                    match logString with
+                    | Some s ->
+                        let matches = regex.Matches (s)
+
+                        let escapedMatches =
+                            Seq.sumBy
+                                (fun (matchItem : Match) ->
+                                    let opening = matchItem.Groups["opening"]
+                                    let closing = matchItem.Groups["closing"]
+                                    let isEscaped = opening.Value.Length % 2 = 0 && closing.Value.Length % 2 = 0
+                                    if isEscaped then 1 else 0
+                                )
+                                matches
+
+                        matches.Count - escapedMatches
+                    | None -> 0
+
+                if
+                    m.Assembly.SimpleName = assemblyName
+                    && Set.contains name namesToWarnAbout
+                    && provided <> expected
+                then
+                    state.Add range
+        }
+
+    walkTast walker typedTree
+
+    [
+        for range in state do
+            {
+                Type = "LoggingTemplateMissingValuesAnalyzer"
+                Message =
+                    "The given values in your call to ILogger.Log{Warning, Error, ...} don't match the expected templated args."
+                Code = Code
+                Severity = Warning
+                Range = range
+                Fixes = []
+            }
+    ]
+
+
+[<Literal>]
+let Name = "LoggingTemplateMissingValuesAnalyzer"
+
+[<Literal>]
+let ShortDescription =
+    "Checks if all templated args in a log message have been given values or too many values have been given"
+
+[<Literal>]
+let HelpUri =
+    "https://g-research.github.io/fsharp-analyzers/analyzers/LoggingTemplateMissingValuesAnalyzer.html"
+
+[<CliAnalyzer(Name, ShortDescription, HelpUri)>]
+let loggingTemplateMissingValuesCliAnalyzer : Analyzer<CliContext> =
+    fun (ctx : CliContext) -> async { return ctx.TypedTree |> Option.map analyze |> Option.defaultValue [] }
+
+[<EditorAnalyzer(Name, ShortDescription, HelpUri)>]
+let loggingTemplateMissingValuesEditorAnalyzer : Analyzer<EditorContext> =
+    fun (ctx : EditorContext) -> async { return ctx.TypedTree |> Option.map analyze |> Option.defaultValue [] }

tests/FSharp.Analyzers.Tests/FSharp.Analyzers.Tests.fsproj

@@ -15,6 +15,7 @@
     <Compile Include="UnionCaseAnalyzerTests.fs" />
     <Compile Include="VirtualCallAnalyzerTests.fs" />
     <Compile Include="LoggingArgFuncNotFullyAppliedAnalyzerTests.fs" />
+    <Compile Include="LoggingTemplateMissingValuesAnalyzerTests.fs" />
     <Compile Include="TypeAnnotateStringFunctionAnalyzerTests.fs" />
     <Compile Include="ImmutableCollectionEqualityAnalyzerTests.fs" />
     <Compile Include="TypedInterpolatedStringsAnalyzerTests.fs" />

tests/FSharp.Analyzers.Tests/LoggingTemplateMissingValuesAnalyzerTests.fs

@@ -0,0 +1,71 @@
+namespace GR.FSharp.Analyzers.Tests
+
+module LoggingTemplateMissingValuesAnalyzerTests =
+
+    open System.Collections
+    open System.IO
+    open NUnit.Framework
+    open FSharp.Compiler.CodeAnalysis
+    open FSharp.Analyzers.SDK.Testing
+    open GR.FSharp.Analyzers
+    open GR.FSharp.Analyzers.Tests.Common
+
+    let mutable projectOptions : FSharpProjectOptions = FSharpProjectOptions.zero
+
+    [<SetUp>]
+    let Setup () =
+        task {
+            let! options =
+                mkOptionsFromProject
+                    "net7.0"
+                    [
+                        {
+                            Name = "Microsoft.Extensions.Logging"
+                            Version = "8.0.0"
+                        }
+                        {
+                            Name = "Microsoft.Extensions.Logging.Console"
+                            Version = "8.0.0"
+                        }
+                    ]
+
+            projectOptions <- options
+        }
+
+    type TestCases() =
+
+        interface IEnumerable with
+            member _.GetEnumerator () : IEnumerator =
+                constructTestCaseEnumerator [| "loggingtemplatemissingvalues" |]
+
+    [<TestCaseSource(typeof<TestCases>)>]
+    let Tests (fileName : string) =
+        task {
+            let fileName = Path.Combine (dataFolder, fileName)
+
+            let! messages =
+                File.ReadAllText fileName
+                |> getContext projectOptions
+                |> LoggingTemplateMissingValuesAnalyzer.loggingTemplateMissingValuesCliAnalyzer
+
+            do! assertExpected fileName messages
+        }
+
+    type NegativeTestCases() =
+
+        interface IEnumerable with
+            member _.GetEnumerator () : IEnumerator =
+                constructTestCaseEnumerator [| "loggingtemplatemissingvalues" ; "negative" |]
+
+    [<TestCaseSource(typeof<NegativeTestCases>)>]
+    let NegativeTests (fileName : string) =
+        task {
+            let fileName = Path.Combine (dataFolder, fileName)
+
+            let! messages =
+                File.ReadAllText fileName
+                |> getContext projectOptions
+                |> LoggingTemplateMissingValuesAnalyzer.loggingTemplateMissingValuesCliAnalyzer
+
+            Assert.That (messages, Is.Empty)
+        }

tests/data/loggingtemplatemissingvalues/Warnings for one missing.fs

@@ -0,0 +1,9 @@
+module M
+
+    open Microsoft.Extensions.Logging
+
+    let testlog () =
+        use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+        let logger: ILogger = factory.CreateLogger("Program")
+
+        logger.Log(LogLevel.Information, "xxx {one} yyy {two}", 23)

tests/data/loggingtemplatemissingvalues/Warnings for one missing.fs.expected

@@ -0,0 +1 @@
+GRA-LOGTEMPLMISSVALS-001 | Warning | (9,8 - 9,67) | The given values in your call to ILogger.Log{Warning, Error, ...} don't match the expected templated args. | []

tests/data/loggingtemplatemissingvalues/negative/No warnings for escaped parens.fs

@@ -0,0 +1,9 @@
+module M
+
+    open Microsoft.Extensions.Logging
+
+    let testlog () =
+        use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+        let logger: ILogger = factory.CreateLogger("Program")
+
+        logger.Log(LogLevel.Information, "xxx {{esc1}} {{{{esc2}}}} {{{{{{esc3}}}}}} yyy {two}", 2)

tests/data/loggingtemplatemissingvalues/negative/No warnings for interpolated.fs

@@ -0,0 +1,9 @@
+module M
+
+    open Microsoft.Extensions.Logging
+
+    let testlog () =
+        use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+        let logger: ILogger = factory.CreateLogger("Program")
+
+        logger.Log(LogLevel.Information, $"xxx {123}")

tests/data/loggingtemplatemissingvalues/negative/No warnings for none expected.fs

@@ -0,0 +1,9 @@
+module M
+
+    open Microsoft.Extensions.Logging
+
+    let testlog () =
+        use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+        let logger: ILogger = factory.CreateLogger("Program")
+
+        logger.Log(LogLevel.Information, "xxx")

tests/data/loggingtemplatemissingvalues/negative/No warnings for none missing.fs

@@ -0,0 +1,9 @@
+module M
+
+    open Microsoft.Extensions.Logging
+
+    let testlog () =
+        use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+        let logger: ILogger = factory.CreateLogger("Program")
+
+        logger.Log(LogLevel.Information, "xxx {one} yyy {two}", 23, 42)

tests/data/loggingtemplatemissingvalues/negative/No warnings for obj values.fs

@@ -0,0 +1,9 @@
+module M
+
+    open Microsoft.Extensions.Logging
+
+    let testlog () =
+        use factory = LoggerFactory.Create(fun b -> b.AddConsole() |> ignore)
+        let logger: ILogger = factory.CreateLogger("Program")
+
+        logger.Log(LogLevel.Information, "xxx {one}", obj())