syslwrapper

package
v0.75.0 Latest Latest
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 Go to latest Published: May 4, 2020 License: Apache-2.0 Imports: 3 Imported by: 2

README

syslwrapper

This package adds an abstraction layer around sysl proto types defined in the sysl package. This is currently a work in progress, but is intended to make working with sysl types much easier and to solve common issues around working with sysl type references, as well as parsing return statements.

Usage

func main() {
	filename := "demo/grocerystore/GroceryStore.sysl"
	syslModules, err := parse.NewParser().Parse(filename, afero.NewOsFs())
	if err != nil {
		panic(err)
	}
   
	mapper := MakeAppMapper(syslModules)
    mapper.IndexTypes() // This indexes all the sysl.Type in each application in a map, which can be accessed using "AppName:TypeName"
    mapper.ConvertTypes() // This converts the indexed types into syslwrapper.Type
    simpleApps, err := mapper.Map() // Maps the applications in syslModules into simple syslwrapperApps
    
    getInventoryEndpoint := simpleApps.["GroceryStore"].Endpoints["GET /inventory"]
    params := getInventoryEndpoint.Params
    responses := getInventoryEndpoint.Responses
    
    prettyPrintParams, err := json.MarshalIndent(params, "", " ")
	prettyPrintResponses, err := json.MarshalIndent(responses, "", " ")
	prettyPrintInventoryResponse, err := json.MarshalIndent(mapper.SimpleTypes["GroceryStore:fooid"], "", " ")
    fmt.Println(string(prettyPrintParams))
	fmt.Println(string(prettyPrintResponses))
	fmt.Println(string(prettyPrintInventoryResponse))
}
Response Statement Parsing

Responses are returned as

{
 "200": {
  "In": "",
  "Description": "",
  "Name": "200",
  "Type": {
   "Description": "",
   "Optional": false,
   "Reference": "",
   "Type": "list",
   "Items": [
    {
     "Description": "",
     "Optional": false,
     "Reference": "GroceryStore:InventoryResponse",
     "Type": "ref",
     "Items": null,
     "Enum": null,
     "Properties": null
    }
   ],
   "Enum": null,
   "Properties": null
  }
 }
}

Let's compare this with what the sysl.Application type gives us if we called syslModules.Apps["GroceryStore"].Endpoints["GET /inventory"].Stmt

[
 {
  "Stmt": {
   "Call": {
    "target": {
     "part": [
      "Inventory"
     ]
    },
    "endpoint": "GET /inventory"
   }
  }
 },
 {
  "Stmt": {
   "Ret": {
    "payload": "sequence of InventoryResponse"
   }
  }
 }
]
Parameter Type Conversion

Here's what simpleApps["GroceryStore"].Endpoints["GET /inventory"].Params gives us

{
 "fooid": {
  "In": "header",
  "Description": "",
  "Name": "fooid",
  "Type": {
   "Description": "",
   "Optional": false,
   "Reference": "",
   "Type": "string",
   "Items": null,
   "Enum": null,
   "Properties": null
  }
 }
}

Let's compare this with what the sysl.Application type gives us if we called syslModules.Apps["GroceryStore"].Endpoints["GET /inventory"].Param

[
 {
  "name": "fooid",
  "type": {
   "Type": {
    "Primitive": 6
   },
   "attrs": {
    "name": {
     "Attribute": {
      "S": "FooID"
     }
    },
    "patterns": {
     "Attribute": {
      "A": {
       "elt": [
        {
         "Attribute": {
          "S": "header"
         }
        },
        {
         "Attribute": {
          "S": "required"
         }
        }
       ]
      }
     }
    }
   }
  }
 }
]
Type Lookups

If we wanted to lookup what InventoryResponse was, we can just call

    mapper.SimpleTypes["GroceryStore:InventoryResponse"]

which returns

{
 "Description": "",
 "Optional": false,
 "Reference": "",
 "Type": "tuple",
 "Items": null,
 "Enum": null,
 "Properties": {
  "item_id": {
   "Description": "",
   "Optional": false,
   "Reference": "",
   "Type": "string",
   "Items": null,
   "Enum": null,
   "Properties": null
  },
  "quantity": {
   "Description": "",
   "Optional": false,
   "Reference": "",
   "Type": "int",
   "Items": null,
   "Enum": null,
   "Properties": null
  }
 }
}
Type Resolution (WIP)

Lets say you don't care for having to deal with looking up type references, you just want definite types for all of these

mapper.ResolveTypes()

Or if you want to just resolve one type, use mapper.ResolveTypes() Not Yet Fully Implemented

This function goes through each type reference and replaces it with the actual data type. This converts the data types from a graph representation to a tree representation.

This feature is still under construction, with some recursion that needs to be resolved.

Example

func main() {
	filename := "demo/grocerystore/GroceryStore.sysl"
	syslModules, err := parse.NewParser().Parse(filename, afero.NewOsFs())
	if err != nil {
		panic(err)
	}

	mapper := syslwrapper.MakeAppMapper(syslModules)
	mapper.IndexTypes()
	mapper.ResolveTypes()
	mapper.ConvertTypes()
	simpleApps, err := mapper.Map()

	responses := simpleApps["GroceryStore"].Endpoints["GET /inventory"].Response
	prettyPrintResponses, err := json.MarshalIndent(responses, "", " ")
	fmt.Println(string(prettyPrintResponses))
}

{
 "200": {
  "In": "",
  "Description": "",
  "Name": "200",
  "Type": {
   "Description": "",
   "Optional": false,
   "Reference": "",
   "Type": "list",
   "Items": [
    {
     "Description": "",
     "Optional": false,
     "Reference": "GroceryStore:InventoryResponse",
     "Type": "ref",
     "Items": null,
     "Enum": null,
     "Properties": null
    }
   ],
   "Enum": null,
   "Properties": null
  }
 }
}

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func HasPattern 

func HasPattern(attrs map[string]*sysl.Attribute, pattern string) bool

func MakeApp 

func MakeApp(name string, params []*sysl.Param, types map[string]*sysl.Type) sysl.Application

func MakeAppName 

func MakeAppName(name string) *sysl.AppName

func MakeEnum 

func MakeEnum(enum map[int64]string) *sysl.Type

func MakeList 

func MakeList(listType *sysl.Type) *sysl.Type

func MakeMap 

func MakeMap(keyType *sysl.Type, valueType *sysl.Type) *sysl.Type

func MakeNoType 

func MakeNoType() *sysl.Type

func MakeOneOf 

func MakeOneOf(oneOfType []*sysl.Type) *sysl.Type

func MakeParam 

func MakeParam(name string, paramType *sysl.Type) *sysl.Param

func MakePrimitive 

func MakePrimitive(primType string) *sysl.Type

func MakeReturnStatement 

func MakeReturnStatement(payload string) *sysl.Statement

func MakeTuple 

func MakeTuple(tuple map[string]*sysl.Type) *sysl.Type

func MakeType 

func MakeType(name string, value interface{}, t string) *sysl.Type

func MakeTypeRef 

func MakeTypeRef(contextApp string, contextTypePath []string, refApp string, refTypePath []string) *sysl.Type

Creates a type reference from one context to another. contextApp is the name of the app where the typeref is used refApp is the app where the

func ParamIn 

func ParamIn(attrs map[string]*sysl.Attribute) string

Types

type App 

type App struct {
	Name       string
	Attributes map[string]string    // Contains app level attributes. All attributes assumed to be strings.
	Endpoints  map[string]*Endpoint // Contains all application endpoints
	Types      map[string]*Type     // Contains all type definitions in the application, excluding types defined in Params and Responses
}

App is a simplified representation of an application in sysl

type AppMapper 

type AppMapper struct {
	Module      *sysl.Module
	Types       map[string]*sysl.Type // A map of all sysl types. Key is in format "appname:typename".
	SimpleTypes map[string]*Type      // A map of all simplified types. Key is in format "appname:typename".
}

func MakeAppMapper 

func MakeAppMapper(m *sysl.Module) *AppMapper

MakeAppMapper creates an appmapper

func (*AppMapper) BuildApplication 

func (am *AppMapper) BuildApplication(a *sysl.Application) *App

BuildApplication returns a clean representation of a Sysl Application which hides the complexities of the protobuf generated type.

func (*AppMapper) ConvertTypes 

func (am *AppMapper) ConvertTypes() map[string]*Type

func (*AppMapper) GetAttribute 

func (am *AppMapper) GetAttribute(attribute map[string]*sysl.Attribute, attributeName string) string

func (*AppMapper) GetRefDetails 

func (am *AppMapper) GetRefDetails(t *sysl.Type) (appName string, typeName string)

TypeRefs can have various formats. Case 1: When a type defined in the same app is referenced in a TYPE

  • no appname is provided in the path
  • the ref.path[0] element is the type name

Case 2: When a type from another app is referenced in a TYPE

  • context is provided
  • the ref.path[0] element is the application name

Case 3: When a type from another app is referenced in a parameter

  • context is NOT provided
  • ref.appName is provided
  • the ref.path[0] element is the type name

Case 4: When a type from the same app is referenced in a parameter

  • context is NOT provided
  • ref.appName is provided AND is the type name (This is crazy and needs to be fixed)

func (*AppMapper) IndexTypes 

func (am *AppMapper) IndexTypes() map[string]*sysl.Type

Creates a map of all types TODO Check if colon is valid in typename

func (*AppMapper) Map 

func (am *AppMapper) Map() (map[string]*App, error)

ImportModule takes a sysl module and maps them into an array of simplified App structs It resolves any type references and cross application calls

func (*AppMapper) MapSyslType 

func (am *AppMapper) MapSyslType(t *sysl.Type) (*sysl.Type, error)

MapSyslType converts types from sysl.Type to Type

func (*AppMapper) MapType 

func (am *AppMapper) MapType(t *sysl.Type) *Type

Converts sysl type to a string representation of the type

func (*AppMapper) ResolveTypes 

func (am *AppMapper) ResolveTypes()

Iterates over types and resolves typerefs

type Endpoint 

type Endpoint struct {
	Summary     string                // Short human-readable description of what the endpoint does
	Description string                // Longer description of what the endpoint does
	Path        string                // Path
	Params      map[string]*Parameter // Request parameters
	Response    map[string]*Parameter // Response parameters
	Downstream  []string              // TODO: Work out the dependency graph of each application. Store downstreams in this field.
}

Endpoint is a simplified representation of a Sysl endpoint

type Parameter 

type Parameter struct {
	In          string // Valid values include {body, header, path, query}. Cookie not supported
	Description string
	Name        string
	Type        *Type
}

type Type 

type Type struct {
	Description string
	Optional    bool             // Used to represent if the type is optional
	Reference   string           // Used to represent type references. In the format of app:typename.
	Type        string           // Used to indicate the type. Can be one of {"bool", "int", "float", "decimal", "string", "string_8", "bytes", "date", "datetime", "xml", "uuid", "ref", "list", "map", "enum", "tuple"}
	Items       []*Type          // Used to represent map types, where the 0 index is the key type, and 1 index is the value type.
	Enum        map[int64]string // Used to represent enums
	Properties  map[string]*Type // Used to represent tuple types.
}

Type represents a simplified Sysl Type.

Source Files

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