sqlc-gen-python/internal/gen.go at kyle/sqlc-1-24 · sqlc-dev/sqlc-gen-python · GitHub

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package python

import (

"context"

json "encoding/json"

"errors"

"fmt"

"log"

"regexp"

"sort"

"strings"

"github.com/sqlc-dev/plugin-sdk-go/metadata"

"github.com/sqlc-dev/plugin-sdk-go/plugin"

"github.com/sqlc-dev/plugin-sdk-go/sdk"

pyast "github.com/sqlc-dev/sqlc-gen-python/internal/ast"

"github.com/sqlc-dev/sqlc-gen-python/internal/inflection"

"github.com/sqlc-dev/sqlc-gen-python/internal/poet"

pyprint "github.com/sqlc-dev/sqlc-gen-python/internal/printer"

)

type Constant struct {

Name string

Type string

Value string

}

type Enum struct {

Name string

Comment string

Constants []Constant

}

type pyType struct {

InnerType string

IsArray bool

IsNull bool

}

func (t pyType) Annotation() *pyast.Node {

ann := poet.Name(t.InnerType)

if t.IsArray {

ann = subscriptNode("List", ann)

}

if t.IsNull {

ann = subscriptNode("Optional", ann)

}

return ann

}

type Field struct {

Name string

Type pyType

Comment string

}

type Struct struct {

Table plugin.Identifier

Name string

Fields []Field

Comment string

}

type QueryValue struct {

Emit bool

Name string

Struct *Struct

Typ pyType

}

func (v QueryValue) Annotation() *pyast.Node {

if v.Typ != (pyType{}) {

return v.Typ.Annotation()

}

if v.Struct != nil {

if v.Emit {

return poet.Name(v.Struct.Name)

} else {

return typeRefNode("models", v.Struct.Name)

}

panic("no type for QueryValue: " + v.Name)

}

func (v QueryValue) EmitStruct() bool {

return v.Emit

}

func (v QueryValue) IsStruct() bool {

return v.Struct != nil

}

func (v QueryValue) isEmpty() bool {

return v.Typ == (pyType{}) && v.Name == "" && v.Struct == nil

}

func (v QueryValue) RowNode(rowVar string) *pyast.Node {

if !v.IsStruct() {

return subscriptNode(

rowVar,

constantInt(0),

)

}

call := &pyast.Call{

Func: v.Annotation(),

}

for i, f := range v.Struct.Fields {

call.Keywords = append(call.Keywords, &pyast.Keyword{

Arg: f.Name,

Value: subscriptNode(

rowVar,

constantInt(i),

})

}

return &pyast.Node{

Node: &pyast.Node_Call{

Call: call,

}

// A struct used to generate methods and fields on the Queries struct

type Query struct {

Cmd string

Comments []string

MethodName string

FieldName string

ConstantName string

SQL string

SourceName string

Ret QueryValue

Args []QueryValue

}

func (q Query) AddArgs(args *pyast.Arguments) {

// A single struct arg does not need to be passed as a keyword argument

if len(q.Args) == 1 && q.Args[0].IsStruct() {

args.Args = append(args.Args, &pyast.Arg{

Arg: q.Args[0].Name,

Annotation: q.Args[0].Annotation(),

})

return

}

for _, a := range q.Args {

args.KwOnlyArgs = append(args.KwOnlyArgs, &pyast.Arg{

Arg: a.Name,

Annotation: a.Annotation(),

})

}

func (q Query) ArgDictNode() *pyast.Node {

dict := &pyast.Dict{}

i := 1

for _, a := range q.Args {

if a.isEmpty() {

continue

}

if a.IsStruct() {

for _, f := range a.Struct.Fields {

dict.Keys = append(dict.Keys, poet.Constant(fmt.Sprintf("p%v", i)))

dict.Values = append(dict.Values, typeRefNode(a.Name, f.Name))

i++

}

} else {

dict.Keys = append(dict.Keys, poet.Constant(fmt.Sprintf("p%v", i)))

dict.Values = append(dict.Values, poet.Name(a.Name))

i++

}

if len(dict.Keys) == 0 {

return nil

}

return &pyast.Node{

Node: &pyast.Node_Dict{

Dict: dict,

}

func makePyType(req *plugin.GenerateRequest, col *plugin.Column) pyType {

typ := pyInnerType(req, col)

return pyType{

InnerType: typ,

IsArray: col.IsArray,

IsNull: !col.NotNull,

}

func pyInnerType(req *plugin.GenerateRequest, col *plugin.Column) string {

switch req.Settings.Engine {

case "postgresql":

return postgresType(req, col)

default:

log.Println("unsupported engine type")

return "Any"

}

func modelName(name string, settings *plugin.Settings) string {

out := ""

for _, p := range strings.Split(name, "_") {

out += strings.Title(p)

}

return out

}

var matchFirstCap = regexp.MustCompile("(.)([A-Z][a-z]+)")

var matchAllCap = regexp.MustCompile("([a-z0-9])([A-Z])")

func methodName(name string) string {

snake := matchFirstCap.ReplaceAllString(name, "${1}_${2}")

snake = matchAllCap.ReplaceAllString(snake, "${1}_${2}")

return strings.ToLower(snake)

}

var pyIdentPattern = regexp.MustCompile("[^a-zA-Z0-9_]+")

func pyEnumValueName(value string) string {

id := strings.Replace(value, "-", "_", -1)

id = strings.Replace(id, ":", "_", -1)

id = strings.Replace(id, "/", "_", -1)

id = pyIdentPattern.ReplaceAllString(id, "")

return strings.ToUpper(id)

}

func buildEnums(req *plugin.GenerateRequest) []Enum {

var enums []Enum

for _, schema := range req.Catalog.Schemas {

if schema.Name == "pg_catalog" || schema.Name == "information_schema" {

continue

}

for _, enum := range schema.Enums {

var enumName string

if schema.Name == req.Catalog.DefaultSchema {

enumName = enum.Name

} else {

enumName = schema.Name + "_" + enum.Name

}

e := Enum{

Name: modelName(enumName, req.Settings),

Comment: enum.Comment,

}

for _, v := range enum.Vals {

e.Constants = append(e.Constants, Constant{

Name: pyEnumValueName(v),

Value: v,

Type: e.Name,

})

}

enums = append(enums, e)

}

if len(enums) > 0 {

sort.Slice(enums, func(i, j int) bool { return enums[i].Name < enums[j].Name })

}

return enums

}

func buildModels(conf Config, req *plugin.GenerateRequest) []Struct {

var structs []Struct

for _, schema := range req.Catalog.Schemas {

if schema.Name == "pg_catalog" || schema.Name == "information_schema" {

continue

}

for _, table := range schema.Tables {

var tableName string

if schema.Name == req.Catalog.DefaultSchema {

tableName = table.Rel.Name

} else {

tableName = schema.Name + "_" + table.Rel.Name

}

structName := tableName

if !conf.EmitExactTableNames {

structName = inflection.Singular(inflection.SingularParams{

Name: structName,

Exclusions: conf.InflectionExcludeTableNames,

})

}

s := Struct{

Table: plugin.Identifier{Schema: schema.Name, Name: table.Rel.Name},

Name: modelName(structName, req.Settings),

Comment: table.Comment,

}

for _, column := range table.Columns {

typ := makePyType(req, column) // TODO: This used to call compiler.ConvertColumn?

typ.InnerType = strings.TrimPrefix(typ.InnerType, "models.")

s.Fields = append(s.Fields, Field{

Name: column.Name,

Type: typ,

Comment: column.Comment,

})

}

structs = append(structs, s)

}

if len(structs) > 0 {

sort.Slice(structs, func(i, j int) bool { return structs[i].Name < structs[j].Name })

}

return structs

}

func columnName(c *plugin.Column, pos int) string {

if c.Name != "" {

return c.Name

}

return fmt.Sprintf("column_%d", pos+1)

}

func paramName(p *plugin.Parameter) string {

if p.Column.Name != "" {

return p.Column.Name

}

return fmt.Sprintf("dollar_%d", p.Number)

}

type pyColumn struct {

id int32

*plugin.Column

}

func columnsToStruct(req *plugin.GenerateRequest, name string, columns []pyColumn) *Struct {

gs := Struct{

Name: name,

}

seen := map[string]int32{}

suffixes := map[int32]int32{}

for i, c := range columns {

colName := columnName(c.Column, i)

fieldName := colName

// Track suffixes by the ID of the column, so that columns referring to

// the same numbered parameter can be reused.

var suffix int32

if o, ok := suffixes[c.id]; ok {

suffix = o

} else if v := seen[colName]; v > 0 {

suffix = v + 1

}

suffixes[c.id] = suffix

if suffix > 0 {

fieldName = fmt.Sprintf("%s_%d", fieldName, suffix)

}

gs.Fields = append(gs.Fields, Field{

Name: fieldName,

Type: makePyType(req, c.Column),

})

seen[colName]++

}

return &gs

}

var postgresPlaceholderRegexp = regexp.MustCompile(`\B\$(\d+)\b`)

// Sqlalchemy uses ":name" for placeholders, so "$N" is converted to ":pN"

// This also means ":" has special meaning to sqlalchemy, so it must be escaped.

func sqlalchemySQL(s, engine string) string {

s = strings.ReplaceAll(s, ":", `\\:`)

if engine == "postgresql" {

return postgresPlaceholderRegexp.ReplaceAllString(s, ":p$1")

}

return s

}

func buildQueries(conf Config, req *plugin.GenerateRequest, structs []Struct) ([]Query, error) {

qs := make([]Query, 0, len(req.Queries))

for _, query := range req.Queries {

if query.Name == "" {

continue

}

if query.Cmd == "" {

continue

}

if query.Cmd == metadata.CmdCopyFrom {

return nil, errors.New("Support for CopyFrom in Python is not implemented")

}

methodName := methodName(query.Name)

gq := Query{

Cmd: query.Cmd,

Comments: query.Comments,

MethodName: methodName,

FieldName: sdk.LowerTitle(query.Name) + "Stmt",

ConstantName: strings.ToUpper(methodName),

SQL: sqlalchemySQL(query.Text, req.Settings.Engine),

SourceName: query.Filename,

}

qpl := 4

if conf.QueryParameterLimit != nil {

qpl = int(*conf.QueryParameterLimit)

}

if qpl < 0 {

return nil, errors.New("invalid query parameter limit")

}

if len(query.Params) > qpl || qpl == 0 {

var cols []pyColumn

for _, p := range query.Params {

cols = append(cols, pyColumn{

id: p.Number,

Column: p.Column,

})

}

gq.Args = []QueryValue{{

Emit: true,

Name: "arg",

Struct: columnsToStruct(req, query.Name+"Params", cols),

}}

} else {

args := make([]QueryValue, 0, len(query.Params))

for _, p := range query.Params {

args = append(args, QueryValue{

Name: paramName(p),

Typ: makePyType(req, p.Column),

})

}

gq.Args = args

}

if len(query.Columns) == 1 {

c := query.Columns[0]

gq.Ret = QueryValue{

Name: columnName(c, 0),

Typ: makePyType(req, c),

}

} else if len(query.Columns) > 1 {

var gs *Struct

var emit bool

for _, s := range structs {

if len(s.Fields) != len(query.Columns) {

continue

}

same := true

for i, f := range s.Fields {

c := query.Columns[i]

// HACK: models do not have "models." on their types, so trim that so we can find matches

trimmedPyType := makePyType(req, c)

trimmedPyType.InnerType = strings.TrimPrefix(trimmedPyType.InnerType, "models.")

sameName := f.Name == columnName(c, i)

sameType := f.Type == trimmedPyType

sameTable := sdk.SameTableName(c.Table, &s.Table, req.Catalog.DefaultSchema)

if !sameName || !sameType || !sameTable {

same = false

}

if same {

gs = &s

break

}

if gs == nil {

var columns []pyColumn

for i, c := range query.Columns {

columns = append(columns, pyColumn{

id: int32(i),

Column: c,

})

}

gs = columnsToStruct(req, query.Name+"Row", columns)

emit = true

}

gq.Ret = QueryValue{

Emit: emit,

Name: "i",

Struct: gs,

}

qs = append(qs, gq)

}

sort.Slice(qs, func(i, j int) bool { return qs[i].MethodName < qs[j].MethodName })

return qs, nil

}

func moduleNode(version, source string) *pyast.Module {

mod := &pyast.Module{

Body: []*pyast.Node{

poet.Comment(

"Code generated by sqlc. DO NOT EDIT.",

poet.Comment(

"versions:",

poet.Comment(

" sqlc " + version,

}

if source != "" {

mod.Body = append(mod.Body,

poet.Comment(

"source: "+source,

)

}

return mod

}

func importNode(name string) *pyast.Node {

return &pyast.Node{

Node: &pyast.Node_Import{

Import: &pyast.Import{

Names: []*pyast.Node{

{

Node: &pyast.Node_Alias{

Alias: &pyast.Alias{

Name: name,

}

func classDefNode(name string, bases ...*pyast.Node) *pyast.Node {

return &pyast.Node{

Node: &pyast.Node_ClassDef{

ClassDef: &pyast.ClassDef{

Name: name,

Bases: bases,

}

func assignNode(target string, value *pyast.Node) *pyast.Node {

return &pyast.Node{

Node: &pyast.Node_Assign{

Assign: &pyast.Assign{

Targets: []*pyast.Node{

poet.Name(target),

Value: value,

}

func constantInt(value int) *pyast.Node {

return &pyast.Node{

Node: &pyast.Node_Constant{

Constant: &pyast.Constant{

Value: &pyast.Constant_Int{

Int: int32(value),

}

func subscriptNode(value string, slice *pyast.Node) *pyast.Node {

return &pyast.Node{

Node: &pyast.Node_Subscript{

Subscript: &pyast.Subscript{

Value: &pyast.Name{Id: value},

Slice: slice,

}

func dataclassNode(name string) *pyast.ClassDef {

return &pyast.ClassDef{

Name: name,

DecoratorList: []*pyast.Node{

{

Node: &pyast.Node_Call{

Call: &pyast.Call{

Func: poet.Attribute(poet.Name("dataclasses"), "dataclass"),

}

func pydanticNode(name string) *pyast.ClassDef {

return &pyast.ClassDef{

Name: name,

Bases: []*pyast.Node{

{

Node: &pyast.Node_Attribute{

Attribute: &pyast.Attribute{

Value: &pyast.Node{

Node: &pyast.Node_Name{

Name: &pyast.Name{Id: "pydantic"},

Attr: "BaseModel",

}

func fieldNode(f Field) *pyast.Node {

return &pyast.Node{

Node: &pyast.Node_AnnAssign{

AnnAssign: &pyast.AnnAssign{

Target: &pyast.Name{Id: f.Name},

Annotation: f.Type.Annotation(),

Comment: f.Comment,

}

func typeRefNode(base string, parts ...string) *pyast.Node {

n := poet.Name(base)

for _, p := range parts {

n = poet.Attribute(n, p)

}

return n

}

func connMethodNode(method, name string, arg *pyast.Node) *pyast.Node {

args := []*pyast.Node{

{

Node: &pyast.Node_Call{

Call: &pyast.Call{

Func: typeRefNode("sqlalchemy", "text"),

Args: []*pyast.Node{

poet.Name(name),

}

if arg != nil {

args = append(args, arg)

}

return &pyast.Node{

Node: &pyast.Node_Call{

Call: &pyast.Call{

Func: typeRefNode("self", "_conn", method),

Args: args,

}

func buildImportGroup(specs map[string]importSpec) *pyast.Node {

var body []*pyast.Node

for _, spec := range buildImportBlock2(specs) {

if len(spec.Names) > 0 && spec.Names[0] != "" {

imp := &pyast.ImportFrom{

Module: spec.Module,

}

for _, name := range spec.Names {

imp.Names = append(imp.Names, poet.Alias(name))

}

body = append(body, &pyast.Node{

Node: &pyast.Node_ImportFrom{

ImportFrom: imp,

})

} else {

body = append(body, importNode(spec.Module))

}

return &pyast.Node{

Node: &pyast.Node_ImportGroup{

ImportGroup: &pyast.ImportGroup{

Imports: body,

}

func buildModelsTree(ctx *pyTmplCtx, i *importer) *pyast.Node {

mod := moduleNode(ctx.SqlcVersion, "")

std, pkg := i.modelImportSpecs()

mod.Body = append(mod.Body, buildImportGroup(std), buildImportGroup(pkg))

for _, e := range ctx.Enums {

def := &pyast.ClassDef{

Name: e.Name,

Bases: []*pyast.Node{

poet.Name("str"),

poet.Attribute(poet.Name("enum"), "Enum"),

}

if e.Comment != "" {

def.Body = append(def.Body, &pyast.Node{

Node: &pyast.Node_Expr{

Expr: &pyast.Expr{

Value: poet.Constant(e.Comment),

})

}

for _, c := range e.Constants {

def.Body = append(def.Body, assignNode(c.Name, poet.Constant(c.Value)))

}

mod.Body = append(mod.Body, &pyast.Node{

Node: &pyast.Node_ClassDef{

ClassDef: def,

})

}

for _, m := range ctx.Models {

var def *pyast.ClassDef

if ctx.C.EmitPydanticModels {

def = pydanticNode(m.Name)

} else {

def = dataclassNode(m.Name)

}

if m.Comment != "" {

def.Body = append(def.Body, &pyast.Node{

Node: &pyast.Node_Expr{

Expr: &pyast.Expr{

Value: poet.Constant(m.Comment),

})

}

for _, f := range m.Fields {

def.Body = append(def.Body, fieldNode(f))

}

mod.Body = append(mod.Body, &pyast.Node{

Node: &pyast.Node_ClassDef{

ClassDef: def,

})

}

return &pyast.Node{Node: &pyast.Node_Module{Module: mod}}

}

func querierClassDef() *pyast.ClassDef {

return &pyast.ClassDef{

Name: "Querier",

Body: []*pyast.Node{

{

Node: &pyast.Node_FunctionDef{

FunctionDef: &pyast.FunctionDef{

Name: "__init__",

Args: &pyast.Arguments{

Args: []*pyast.Arg{

{

Arg: "self",

{

Arg: "conn",

Annotation: typeRefNode("sqlalchemy", "engine", "Connection"),

Body: []*pyast.Node{

{

Node: &pyast.Node_Assign{

Assign: &pyast.Assign{

Targets: []*pyast.Node{

poet.Attribute(poet.Name("self"), "_conn"),

Value: poet.Name("conn"),

}

func asyncQuerierClassDef() *pyast.ClassDef {

return &pyast.ClassDef{

Name: "AsyncQuerier",

Body: []*pyast.Node{

{

Node: &pyast.Node_FunctionDef{

FunctionDef: &pyast.FunctionDef{

Name: "__init__",

Args: &pyast.Arguments{

Args: []*pyast.Arg{

{

Arg: "self",

{

Arg: "conn",

Annotation: typeRefNode("sqlalchemy", "ext", "asyncio", "AsyncConnection"),

Body: []*pyast.Node{

{

Node: &pyast.Node_Assign{

Assign: &pyast.Assign{

Targets: []*pyast.Node{

poet.Attribute(poet.Name("self"), "_conn"),

Value: poet.Name("conn"),

}

func buildQueryTree(ctx *pyTmplCtx, i *importer, source string) *pyast.Node {

mod := moduleNode(ctx.SqlcVersion, source)

std, pkg := i.queryImportSpecs(source)

mod.Body = append(mod.Body, buildImportGroup(std), buildImportGroup(pkg))

mod.Body = append(mod.Body, &pyast.Node{

Node: &pyast.Node_ImportGroup{

ImportGroup: &pyast.ImportGroup{

Imports: []*pyast.Node{

{

Node: &pyast.Node_ImportFrom{

ImportFrom: &pyast.ImportFrom{

Module: ctx.C.Package,

Names: []*pyast.Node{

poet.Alias("models"),

})

for _, q := range ctx.Queries {

if !ctx.OutputQuery(q.SourceName) {

continue

}

queryText := fmt.Sprintf("-- name: %s \\\\%s\n%s\n", q.MethodName, q.Cmd, q.SQL)

mod.Body = append(mod.Body, assignNode(q.ConstantName, poet.Constant(queryText)))

for _, arg := range q.Args {

if arg.EmitStruct() {

var def *pyast.ClassDef

if ctx.C.EmitPydanticModels {

def = pydanticNode(arg.Struct.Name)

} else {

def = dataclassNode(arg.Struct.Name)

}

for _, f := range arg.Struct.Fields {

def.Body = append(def.Body, fieldNode(f))

}

mod.Body = append(mod.Body, poet.Node(def))

}

if q.Ret.EmitStruct() {

var def *pyast.ClassDef

if ctx.C.EmitPydanticModels {

def = pydanticNode(q.Ret.Struct.Name)

} else {

def = dataclassNode(q.Ret.Struct.Name)

}

for _, f := range q.Ret.Struct.Fields {

def.Body = append(def.Body, fieldNode(f))

}

mod.Body = append(mod.Body, poet.Node(def))

}

if ctx.C.EmitSyncQuerier {

cls := querierClassDef()

for _, q := range ctx.Queries {

if !ctx.OutputQuery(q.SourceName) {

continue

}

f := &pyast.FunctionDef{

Name: q.MethodName,

Args: &pyast.Arguments{

Args: []*pyast.Arg{

{

Arg: "self",

}

q.AddArgs(f.Args)

exec := connMethodNode("execute", q.ConstantName, q.ArgDictNode())

switch q.Cmd {

case ":one":

f.Body = append(f.Body,

assignNode("row", poet.Node(

&pyast.Call{

Func: poet.Attribute(exec, "first"),

)),

poet.Node(

&pyast.If{

Test: poet.Node(

&pyast.Compare{

Left: poet.Name("row"),

Ops: []*pyast.Node{

poet.Is(),

Comparators: []*pyast.Node{

poet.Constant(nil),

Body: []*pyast.Node{

poet.Return(

poet.Constant(nil),

poet.Return(q.Ret.RowNode("row")),

)

f.Returns = subscriptNode("Optional", q.Ret.Annotation())

case ":many":

f.Body = append(f.Body,

assignNode("result", exec),

poet.Node(

&pyast.For{

Target: poet.Name("row"),

Iter: poet.Name("result"),

Body: []*pyast.Node{

poet.Expr(

poet.Yield(

q.Ret.RowNode("row"),

)

f.Returns = subscriptNode("Iterator", q.Ret.Annotation())

case ":exec":

f.Body = append(f.Body, exec)

f.Returns = poet.Constant(nil)

case ":execrows":

f.Body = append(f.Body,

assignNode("result", exec),

poet.Return(poet.Attribute(poet.Name("result"), "rowcount")),

)

f.Returns = poet.Name("int")

case ":execresult":

f.Body = append(f.Body,

poet.Return(exec),

)

f.Returns = typeRefNode("sqlalchemy", "engine", "Result")

default:

panic("unknown cmd " + q.Cmd)

}

cls.Body = append(cls.Body, poet.Node(f))

}

mod.Body = append(mod.Body, poet.Node(cls))

}

if ctx.C.EmitAsyncQuerier {

cls := asyncQuerierClassDef()

for _, q := range ctx.Queries {

if !ctx.OutputQuery(q.SourceName) {

continue

}

f := &pyast.AsyncFunctionDef{

Name: q.MethodName,

Args: &pyast.Arguments{

Args: []*pyast.Arg{

{

Arg: "self",

}

q.AddArgs(f.Args)

exec := connMethodNode("execute", q.ConstantName, q.ArgDictNode())

switch q.Cmd {

case ":one":

f.Body = append(f.Body,

assignNode("row", poet.Node(

&pyast.Call{

Func: poet.Attribute(poet.Await(exec), "first"),

)),

poet.Node(

&pyast.If{

Test: poet.Node(

&pyast.Compare{

Left: poet.Name("row"),

Ops: []*pyast.Node{

poet.Is(),

Comparators: []*pyast.Node{

View remainder of file in raw view

sqlc-gen-python/internal/gen.go at kyle/sqlc-1-24 · sqlc-dev/sqlc-gen-python · GitHub

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