mirror of
https://github.com/Smaug123/WoofWare.Myriad
synced 2025-10-05 20:18:43 +00:00
764 lines
30 KiB
Forth
764 lines
30 KiB
Forth
namespace WoofWare.Myriad.Plugins
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open System
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open System.Net.Http
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open Fantomas.FCS.Syntax
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open Fantomas.FCS.SyntaxTrivia
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open Fantomas.FCS.Xml
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open Myriad.Core
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/// Attribute indicating a record type to which the "create HTTP client" Myriad
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/// generator should apply during build.
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type HttpClientAttribute () =
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inherit Attribute ()
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[<RequireQualifiedAccess>]
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module internal HttpClientGenerator =
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open Fantomas.FCS.Text.Range
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open Myriad.Core.Ast
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type HttpAttribute =
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// TODO: Format parameter to these attrs
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| Query of string option
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| Path of string
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| Body
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type Parameter =
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{
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Attributes : HttpAttribute list
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IsOptional : bool
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Id : Ident option
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Type : SynType
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}
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let synBindingTriviaZero (isMember : bool) =
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{
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SynBindingTrivia.EqualsRange = Some range0
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InlineKeyword = None
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LeadingKeyword =
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if isMember then
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SynLeadingKeyword.Member range0
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else
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SynLeadingKeyword.Let range0
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}
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type MemberInfo =
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{
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/// E.g. HttpMethod.Get
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HttpMethod : HttpMethod
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/// E.g. "v1/gyms/{gym_id}/attendance"
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UrlTemplate : string
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ReturnType : SynType
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Arity : SynArgInfo list
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Args : Parameter list
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Identifier : Ident
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}
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let httpMethodString (m : HttpMethod) : string =
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if m = HttpMethod.Get then "Get"
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elif m = HttpMethod.Post then "Post"
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elif m = HttpMethod.Delete then "Delete"
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elif m = HttpMethod.Patch then "Post"
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elif m = HttpMethod.Options then "Options"
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elif m = HttpMethod.Head then "Head"
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elif m = HttpMethod.Put then "Put"
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elif m = HttpMethod.Trace then "Trace"
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else failwith $"Unrecognised method: %+A{m}"
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/// E.g. converts `[<Get "blah">]` to (HttpMethod.Get, "blah")
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let extractHttpInformation (attrs : SynAttribute list) : HttpMethod * string =
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let matchingAttrs =
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attrs
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|> List.choose (fun attr ->
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match attr.TypeName.AsString with
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| "Get"
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| "GetAttribute"
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| "RestEase.Get"
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| "RestEase.GetAttribute" -> Some (HttpMethod.Get, attr.ArgExpr)
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| "Post"
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| "PostAttribute"
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| "RestEase.Post"
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| "RestEase.PostAttribute" -> Some (HttpMethod.Post, attr.ArgExpr)
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| "Put"
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| "PutAttribute"
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| "RestEase.Put"
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| "RestEase.PutAttribute" -> Some (HttpMethod.Put, attr.ArgExpr)
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| "Delete"
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| "DeleteAttribute"
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| "RestEase.Delete"
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| "RestEase.DeleteAttribute" -> Some (HttpMethod.Delete, attr.ArgExpr)
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| "Head"
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| "HeadAttribute"
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| "RestEase.Head"
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| "RestEase.HeadAttribute" -> Some (HttpMethod.Head, attr.ArgExpr)
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| "Options"
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| "OptionsAttribute"
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| "RestEase.Options"
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| "RestEase.OptionsAttribute" -> Some (HttpMethod.Options, attr.ArgExpr)
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| "Patch"
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| "PatchAttribute"
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| "RestEase.Patch"
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| "RestEase.PatchAttribute" -> Some (HttpMethod.Patch, attr.ArgExpr)
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| "Trace"
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| "TraceAttribute"
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| "RestEase.Trace"
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| "RestEase.TraceAttribute" -> Some (HttpMethod.Trace, attr.ArgExpr)
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| _ -> None
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)
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match matchingAttrs with
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| [ (meth, arg) ] ->
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match arg with
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| SynExpr.Const (SynConst.String (text, SynStringKind.Regular, _), _) -> meth, text
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| arg ->
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failwithf "Unrecognised AST member in attribute argument. Only regular strings are supported: %+A" arg
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| [] -> failwith "Required exactly one recognised RestEase attribute on member, but got none"
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| matchingAttrs ->
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failwithf "Required exactly one recognised RestEase attribute on member, but got %i" matchingAttrs.Length
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let constructMember (info : MemberInfo) : SynMemberDefn =
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let valInfo =
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SynValInfo.SynValInfo (
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[
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[ SynArgInfo.Empty ]
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[
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for arg in info.Args do
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match arg.Id with
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| None -> yield SynArgInfo.CreateIdString (failwith "TODO: create an arg name")
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| Some id -> yield SynArgInfo.CreateId id
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]
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],
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SynArgInfo.Empty
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)
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let valData =
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SynValData (
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Some
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{
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IsInstance = true
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IsDispatchSlot = false
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IsOverrideOrExplicitImpl = true
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IsFinal = false
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GetterOrSetterIsCompilerGenerated = false
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MemberKind = SynMemberKind.Member
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},
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valInfo,
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None
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)
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let argPats =
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let args =
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info.Args
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|> List.map (fun arg ->
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let argName =
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match arg.Id with
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| None -> failwith "TODO: create an arg name"
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| Some id -> id
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let argType =
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if arg.IsOptional then
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SynType.CreateApp (
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SynType.CreateLongIdent (SynLongIdent.CreateString "option"),
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[ arg.Type ],
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isPostfix = true
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)
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else
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arg.Type
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SynPat.CreateTyped (SynPat.CreateNamed argName, argType)
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)
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SynPat.Tuple (false, args, List.replicate (args.Length - 1) range0, range0)
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|> SynPat.CreateParen
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|> List.singleton
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|> SynArgPats.Pats
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let headPat =
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SynPat.LongIdent (
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SynLongIdent.CreateFromLongIdent [ Ident.Create "_" ; info.Identifier ],
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None,
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None,
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argPats,
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None,
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range0
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)
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let requestUriTrailer =
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(SynExpr.CreateConstString info.UrlTemplate, info.Args)
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||> List.fold (fun template arg ->
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(template, arg.Attributes)
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||> List.fold (fun template attr ->
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match attr with
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| HttpAttribute.Path s ->
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let varName =
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match arg.Id with
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| None -> failwith "TODO: anonymous args"
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| Some id -> id
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template
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|> SynExpr.callMethodArg
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"Replace"
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(SynExpr.CreateParenedTuple
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[
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SynExpr.CreateConstString ("{" + s + "}")
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SynExpr.callMethod "ToString" (SynExpr.CreateIdent varName)
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|> SynExpr.pipeThroughFunction (
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SynExpr.CreateLongIdent (
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SynLongIdent.Create [ "System" ; "Web" ; "HttpUtility" ; "UrlEncode" ]
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)
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)
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])
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| _ -> template
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)
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)
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/// List of (query-param-key, parameter-which-provides-value)
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let queryParams =
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info.Args
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|> List.collect (fun arg ->
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arg.Attributes
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|> List.choose (fun attr ->
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match attr with
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| Query None ->
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let name =
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match arg.Id with
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| None ->
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failwith
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"Expected a name for the argument we're trying to use as an anonymous query parameter"
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| Some name -> name.idText
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Some (name, arg)
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| Query (Some name) -> Some (name, arg)
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| _ -> None
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)
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)
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let requestUriTrailer =
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match queryParams with
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| [] -> requestUriTrailer
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| (firstKey, firstValue) :: queryParams ->
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let firstValueId =
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match firstValue.Id with
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| None -> failwith "Unable to get parameter variable name from anonymous parameter"
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| Some id -> id
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let toString (ident : SynExpr) (ty : SynType) =
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match ty with
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| DateOnly ->
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ident
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|> SynExpr.callMethodArg "ToString" (SynExpr.CreateConstString "yyyy-MM-dd")
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| DateTime ->
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ident
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|> SynExpr.callMethodArg "ToString" (SynExpr.CreateConstString "yyyy-MM-ddTHH:mm:ss")
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| _ -> SynExpr.callMethod "ToString" ident
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let prefix =
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toString (SynExpr.CreateIdent firstValueId) firstValue.Type
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|> SynExpr.CreateParen
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|> SynExpr.pipeThroughFunction (
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SynExpr.CreateLongIdent (SynLongIdent.Create [ "System" ; "Web" ; "HttpUtility" ; "UrlEncode" ])
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)
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|> SynExpr.CreateParen
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|> SynExpr.plus (SynExpr.CreateConstString ("?" + firstKey + "="))
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(prefix, queryParams)
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||> List.fold (fun uri (paramKey, paramValue) ->
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let paramValueId =
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match paramValue.Id with
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| None -> failwith "Unable to get parameter variable name from anonymous parameter"
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| Some id -> id
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toString (SynExpr.CreateIdent paramValueId) paramValue.Type
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|> SynExpr.CreateParen
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|> SynExpr.pipeThroughFunction (
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SynExpr.CreateLongIdent (
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SynLongIdent.Create [ "System" ; "Web" ; "HttpUtility" ; "UrlEncode" ]
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)
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)
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|> SynExpr.CreateParen
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|> SynExpr.plus (SynExpr.plus uri (SynExpr.CreateConstString ("&" + paramKey + "=")))
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)
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|> SynExpr.plus requestUriTrailer
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|> SynExpr.CreateParen
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let requestUri =
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let uriIdent = SynExpr.CreateLongIdent (SynLongIdent.Create [ "System" ; "Uri" ])
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SynExpr.App (
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ExprAtomicFlag.Atomic,
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false,
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uriIdent,
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SynExpr.CreateParenedTuple
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[
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SynExpr.CreateLongIdent (SynLongIdent.Create [ "client" ; "BaseAddress" ])
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SynExpr.CreateApp (
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uriIdent,
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SynExpr.CreateParenedTuple
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[
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requestUriTrailer
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SynExpr.CreateLongIdent (SynLongIdent.Create [ "System" ; "UriKind" ; "Relative" ])
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]
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)
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],
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range0
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)
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let bodyParams =
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info.Args
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|> List.collect (fun arg ->
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arg.Attributes
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|> List.choose (fun attr ->
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match attr with
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| Body -> Some arg
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| _ -> None
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)
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)
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if not bodyParams.IsEmpty then
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failwith "[<Body>] is not yet supported"
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let httpReqMessageConstructor =
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[
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SynExpr.equals
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(SynExpr.CreateIdentString "Method")
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(SynExpr.CreateLongIdent (
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SynLongIdent.Create
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[ "System" ; "Net" ; "Http" ; "HttpMethod" ; httpMethodString info.HttpMethod ]
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))
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SynExpr.equals (SynExpr.CreateIdentString "RequestUri") (SynExpr.CreateIdentString "uri")
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]
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|> SynExpr.CreateParenedTuple
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let returnExpr =
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match info.ReturnType with
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| HttpResponseMessage
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| String
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| Stream -> SynExpr.CreateIdentString "node"
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| _ ->
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JsonParseGenerator.parseNode
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None
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JsonParseGenerator.JsonParseOption.None
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info.ReturnType
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(SynExpr.CreateIdentString "node")
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let implementation =
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[
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yield LetBang ("ct", SynExpr.CreateLongIdent (SynLongIdent.Create [ "Async" ; "CancellationToken" ]))
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yield Let ("uri", requestUri)
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yield
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Use (
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"httpMessage",
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SynExpr.New (
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false,
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SynType.CreateLongIdent (
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SynLongIdent.Create [ "System" ; "Net" ; "Http" ; "HttpRequestMessage" ]
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),
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httpReqMessageConstructor,
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range0
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)
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)
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(*
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if not bodyParams.IsEmpty then
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yield
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Use (
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"queryParams",
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SynExpr.New (
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false,
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SynType.CreateLongIdent (
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SynLongIdent.Create [ "System" ; "Net" ; "Http" ; "StringContent" ]
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),
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SynExpr.CreateParen (failwith "TODO"),
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range0
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)
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)
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yield
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Do (
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SynExpr.LongIdentSet (
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SynLongIdent.Create [ "httpMessage" ; "Content" ],
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SynExpr.CreateIdentString "queryParams",
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range0
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)
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)
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*)
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yield
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LetBang (
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"response",
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SynExpr.awaitTask (
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SynExpr.CreateApp (
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SynExpr.CreateLongIdent (SynLongIdent.Create [ "client" ; "SendAsync" ]),
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SynExpr.CreateParenedTuple
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[ SynExpr.CreateIdentString "httpMessage" ; SynExpr.CreateIdentString "ct" ]
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)
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)
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)
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yield
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Let (
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"response",
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SynExpr.CreateApp (
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SynExpr.CreateLongIdent (SynLongIdent.Create [ "response" ; "EnsureSuccessStatusCode" ]),
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SynExpr.CreateConst SynConst.Unit
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)
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)
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match info.ReturnType with
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| HttpResponseMessage -> yield Let ("node", SynExpr.CreateIdentString "response")
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| String ->
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yield
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LetBang (
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"node",
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SynExpr.awaitTask (
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SynExpr.CreateApp (
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SynExpr.CreateLongIdent (
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SynLongIdent.Create [ "response" ; "Content" ; "ReadAsStringAsync" ]
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),
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SynExpr.CreateIdentString "ct"
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)
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)
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)
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| Stream ->
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yield
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LetBang (
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"node",
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SynExpr.awaitTask (
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SynExpr.CreateApp (
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SynExpr.CreateLongIdent (
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SynLongIdent.Create [ "response" ; "Content" ; "ReadAsStreamAsync" ]
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),
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SynExpr.CreateIdentString "ct"
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)
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)
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)
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| _ ->
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yield
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LetBang (
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"stream",
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SynExpr.awaitTask (
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SynExpr.CreateApp (
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SynExpr.CreateLongIdent (
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SynLongIdent.Create [ "response" ; "Content" ; "ReadAsStreamAsync" ]
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),
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SynExpr.CreateIdentString "ct"
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)
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)
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)
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yield
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LetBang (
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"node",
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SynExpr.awaitTask (
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SynExpr.CreateApp (
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SynExpr.CreateLongIdent (
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SynLongIdent.Create
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[ "System" ; "Text" ; "Json" ; "Nodes" ; "JsonNode" ; "ParseAsync" ]
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),
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SynExpr.CreateParenedTuple
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[
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SynExpr.CreateIdentString "stream"
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SynExpr.equals
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(SynExpr.CreateIdentString "cancellationToken")
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(SynExpr.CreateIdentString "ct")
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]
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)
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)
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)
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]
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|> SynExpr.createCompExpr "async" returnExpr
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|> SynExpr.startAsTask
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|
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SynMemberDefn.Member (
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SynBinding.SynBinding (
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None,
|
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SynBindingKind.Normal,
|
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false,
|
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false,
|
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[],
|
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PreXmlDoc.Empty,
|
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valData,
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headPat,
|
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None,
|
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implementation,
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range0,
|
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DebugPointAtBinding.Yes range0,
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synBindingTriviaZero true
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),
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range0
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)
|
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|
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let rec convertSigParam (ty : SynType) : Parameter =
|
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match ty with
|
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| SynType.Paren (inner, _) -> convertSigParam inner
|
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| SynType.SignatureParameter (attrs, opt, id, usedType, _) ->
|
|
let attrs =
|
|
attrs
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|> List.collect (fun attrs ->
|
|
attrs.Attributes
|
|
|> List.choose (fun attr ->
|
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match attr.TypeName.AsString with
|
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| "Query"
|
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| "QueryAttribute" ->
|
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match attr.ArgExpr with
|
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| SynExpr.Const (SynConst.Unit, _) -> Some (HttpAttribute.Query None)
|
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| SynExpr.Const (SynConst.String (s, SynStringKind.Regular, _), _) ->
|
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Some (HttpAttribute.Query (Some s))
|
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| SynExpr.Const (a, _) ->
|
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failwithf "unrecognised constant arg to the Query attribute: %+A" a
|
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| _ -> None
|
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| "Path"
|
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| "PathAttribute" ->
|
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match attr.ArgExpr with
|
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| SynExpr.Const (SynConst.String (s, SynStringKind.Regular, _), _) ->
|
|
Some (HttpAttribute.Path s)
|
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| SynExpr.Const (a, _) ->
|
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failwithf "unrecognised constant arg to the Path attribute: %+A" a
|
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| _ -> None
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| "Body"
|
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| "BodyAttribute" ->
|
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match attr.ArgExpr with
|
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| SynExpr.Const (SynConst.Unit, _) -> Some (HttpAttribute.Body)
|
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| SynExpr.Const (a, _) ->
|
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failwithf "unrecognised constant arg to the Body attribute: %+A" a
|
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| _ -> None
|
|
| _ -> None
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|
)
|
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)
|
|
|
|
{
|
|
Attributes = attrs
|
|
IsOptional = opt
|
|
Id = id
|
|
Type = usedType
|
|
}
|
|
| _ -> failwithf "expected SignatureParameter, got: %+A" ty
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|
|
let rec extractTypes (tupleType : SynTupleTypeSegment list) : Parameter list =
|
|
match tupleType with
|
|
| [] -> []
|
|
| [ SynTupleTypeSegment.Type param ] -> [ convertSigParam param ]
|
|
| SynTupleTypeSegment.Type param :: SynTupleTypeSegment.Star _ :: rest ->
|
|
convertSigParam param :: extractTypes rest
|
|
| _ -> failwithf "Didn't have alternating type-and-star in interface member definition: %+A" tupleType
|
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|
|
let createModule
|
|
(opens : SynOpenDeclTarget list)
|
|
(ns : LongIdent)
|
|
(interfaceType : SynTypeDefn)
|
|
: SynModuleOrNamespace
|
|
=
|
|
let (SynTypeDefn (SynComponentInfo (_, _, _, interfaceName, _, _, _, _), synTypeDefnRepr, _, _, _, _)) =
|
|
interfaceType
|
|
|
|
let members =
|
|
match synTypeDefnRepr with
|
|
| SynTypeDefnRepr.ObjectModel (_kind, members, _) ->
|
|
members
|
|
|> List.map (fun defn ->
|
|
match defn with
|
|
| SynMemberDefn.AbstractSlot (slotSig, flags, _, _) ->
|
|
match flags.MemberKind with
|
|
| SynMemberKind.Member -> ()
|
|
| kind -> failwithf "Unrecognised member kind: %+A" kind
|
|
|
|
if not flags.IsInstance then
|
|
failwith "member was not an instance member"
|
|
|
|
match slotSig with
|
|
| SynValSig (attrs,
|
|
SynIdent.SynIdent (ident, _),
|
|
_typeParams,
|
|
synType,
|
|
arity,
|
|
isInline,
|
|
isMutable,
|
|
_xmlDoc,
|
|
accessibility,
|
|
synExpr,
|
|
_,
|
|
_) ->
|
|
if isInline then
|
|
failwith "inline members not supported"
|
|
|
|
if isMutable then
|
|
failwith "mutable members not supported"
|
|
|
|
match accessibility with
|
|
| Some (SynAccess.Internal _)
|
|
| Some (SynAccess.Private _) -> failwith "only public members are supported"
|
|
| _ -> ()
|
|
|
|
match synExpr with
|
|
| Some _ -> failwith "literal members are not supported"
|
|
| None -> ()
|
|
|
|
let attrs = attrs |> List.collect (fun a -> a.Attributes)
|
|
|
|
let arity =
|
|
match arity with
|
|
| SynValInfo ([ curriedArgs ], SynArgInfo ([], false, _)) -> curriedArgs
|
|
| SynValInfo (curriedArgs, SynArgInfo ([], false, _)) ->
|
|
failwithf "only tupled arguments are supported, but got: %+A" curriedArgs
|
|
| SynValInfo (_, info) ->
|
|
failwithf
|
|
"only bare return values like `Task<foo>` are supported, but got: %+A"
|
|
info
|
|
|
|
let args, ret =
|
|
match synType with
|
|
| SynType.Fun (argType, Task returnType, _, _) -> argType, returnType
|
|
| _ ->
|
|
failwithf
|
|
"Expected a return type of a generic Task; bad signature was: %+A"
|
|
synType
|
|
|
|
let args =
|
|
match args with
|
|
| SynType.SignatureParameter _ -> [ convertSigParam args ]
|
|
| SynType.Tuple (false, path, _) -> extractTypes path
|
|
| _ -> failwithf "Unrecognised args in interface method declaration: %+A" args
|
|
|
|
let httpMethod, url = extractHttpInformation attrs
|
|
|
|
{
|
|
HttpMethod = httpMethod
|
|
UrlTemplate = url
|
|
ReturnType = ret
|
|
Arity = arity
|
|
Args = args
|
|
Identifier = ident
|
|
}
|
|
| _ -> failwithf "Unrecognised member definition: %+A" defn
|
|
)
|
|
| _ -> failwithf "Unrecognised SynTypeDefnRepr: %+A" synTypeDefnRepr
|
|
|
|
let constructed = members |> List.map constructMember
|
|
let docString = PreXmlDoc.Create " Module for constructing a REST client."
|
|
|
|
let interfaceImpl =
|
|
SynExpr.ObjExpr (
|
|
SynType.LongIdent (SynLongIdent.CreateFromLongIdent interfaceName),
|
|
None,
|
|
Some range0,
|
|
[],
|
|
constructed,
|
|
[],
|
|
range0,
|
|
range0
|
|
)
|
|
|
|
let createFunc =
|
|
SynBinding.SynBinding (
|
|
None,
|
|
SynBindingKind.Normal,
|
|
false,
|
|
false,
|
|
[],
|
|
PreXmlDoc.Create " Create a REST client.",
|
|
SynValData.SynValData (
|
|
None,
|
|
SynValInfo.SynValInfo (
|
|
[ [ SynArgInfo.SynArgInfo ([], false, Some (Ident.Create "client")) ] ],
|
|
SynArgInfo.Empty
|
|
),
|
|
None
|
|
),
|
|
SynPat.CreateLongIdent (
|
|
SynLongIdent.CreateString "make",
|
|
[
|
|
SynPat.CreateParen (
|
|
SynPat.CreateTyped (
|
|
SynPat.CreateNamed (Ident.Create "client"),
|
|
SynType.CreateLongIdent (
|
|
SynLongIdent.Create [ "System" ; "Net" ; "Http" ; "HttpClient" ]
|
|
)
|
|
)
|
|
)
|
|
]
|
|
),
|
|
Some (SynBindingReturnInfo.Create (SynType.LongIdent (SynLongIdent.CreateFromLongIdent interfaceName))),
|
|
interfaceImpl,
|
|
range0,
|
|
DebugPointAtBinding.NoneAtLet,
|
|
synBindingTriviaZero false
|
|
)
|
|
|> List.singleton
|
|
|> SynModuleDecl.CreateLet
|
|
|
|
let moduleName : LongIdent =
|
|
List.last interfaceName
|
|
|> fun ident -> ident.idText
|
|
|> fun s ->
|
|
if s.StartsWith 'I' then
|
|
s.[1..]
|
|
else
|
|
failwithf "Expected interface type to start with 'I', but was: %s" s
|
|
|> Ident.Create
|
|
|> List.singleton
|
|
|
|
let attribs =
|
|
[
|
|
SynAttributeList.Create SynAttribute.compilationRepresentation
|
|
SynAttributeList.Create (SynAttribute.RequireQualifiedAccess ())
|
|
]
|
|
|
|
let modInfo =
|
|
SynComponentInfo.Create (moduleName, attributes = attribs, xmldoc = docString)
|
|
|
|
SynModuleOrNamespace.CreateNamespace (
|
|
ns,
|
|
decls =
|
|
[
|
|
for openStatement in opens do
|
|
yield SynModuleDecl.CreateOpen openStatement
|
|
yield SynModuleDecl.CreateNestedModule (modInfo, [ createFunc ])
|
|
]
|
|
)
|
|
|
|
let rec extractOpens (moduleDecls : SynModuleDecl list) : SynOpenDeclTarget list =
|
|
moduleDecls
|
|
|> List.choose (fun moduleDecl ->
|
|
match moduleDecl with
|
|
| SynModuleDecl.Open (target, _) -> Some target
|
|
| other -> None
|
|
)
|
|
|
|
/// Myriad generator that provides an HTTP client for an interface type using RestEase annotations.
|
|
[<MyriadGenerator("http-client")>]
|
|
type HttpClientGenerator () =
|
|
|
|
interface IMyriadGenerator with
|
|
member _.ValidInputExtensions = [ ".fs" ]
|
|
|
|
member _.Generate (context : GeneratorContext) =
|
|
let ast, _ =
|
|
Ast.fromFilename context.InputFilename |> Async.RunSynchronously |> Array.head
|
|
|
|
let types = Ast.extractTypeDefn ast
|
|
|
|
let opens =
|
|
match ast with
|
|
| ParsedInput.ImplFile (ParsedImplFileInput (_, _, _, _, _, modules, _, _, _)) ->
|
|
modules
|
|
|> List.collect (fun (SynModuleOrNamespace (nsId, _, _, decls, _, _, _, _, _)) ->
|
|
HttpClientGenerator.extractOpens decls
|
|
)
|
|
| _ -> []
|
|
|
|
let namespaceAndTypes =
|
|
types
|
|
|> List.choose (fun (ns, types) ->
|
|
match types |> List.filter Ast.hasAttribute<HttpClientAttribute> with
|
|
| [] -> None
|
|
| types -> Some (ns, types)
|
|
)
|
|
|
|
let modules =
|
|
namespaceAndTypes
|
|
|> List.collect (fun (ns, types) ->
|
|
types
|
|
|> List.map (fun interfaceType ->
|
|
let clientModule = HttpClientGenerator.createModule opens ns interfaceType
|
|
clientModule
|
|
)
|
|
)
|
|
|
|
Output.Ast modules
|