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gen.go
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1146 lines (1053 loc) · 24.9 KB
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package python
import (
"errors"
"fmt"
"log"
"regexp"
"sort"
"strings"
"github.com/kyleconroy/sqlc/internal/codegen"
"github.com/kyleconroy/sqlc/internal/inflection"
"github.com/kyleconroy/sqlc/internal/metadata"
"github.com/kyleconroy/sqlc/internal/pattern"
"github.com/kyleconroy/sqlc/internal/plugin"
pyast "github.com/kyleconroy/sqlc/internal/python/ast"
"github.com/kyleconroy/sqlc/internal/python/poet"
pyprint "github.com/kyleconroy/sqlc/internal/python/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.CodeGenRequest, col *plugin.Column) pyType {
typ := pyInnerType(req, col)
return pyType{
InnerType: typ,
IsArray: col.IsArray,
IsNull: !col.NotNull,
}
}
func pyInnerType(req *plugin.CodeGenRequest, col *plugin.Column) string {
for _, oride := range req.Settings.Overrides {
if !pyTypeIsSet(oride.PythonType) {
continue
}
sameTable := matches(oride, col.Table, req.Catalog.DefaultSchema)
if oride.Column != "" && matchString(oride.ColumnName, col.Name) && sameTable {
return pyTypeString(oride.PythonType)
}
if oride.DbType != "" && oride.DbType == col.DataType && oride.Nullable != (col.NotNull || col.IsArray) {
return pyTypeString(oride.PythonType)
}
}
switch req.Settings.Engine {
case "postgresql":
return postgresType(req, col)
default:
log.Println("unsupported engine type")
return "Any"
}
}
func matchString(pat, target string) bool {
matcher, err := pattern.MatchCompile(pat)
if err != nil {
panic(err)
}
return matcher.MatchString(target)
}
func matches(o *plugin.Override, n *plugin.Identifier, defaultSchema string) bool {
if n == nil {
return false
}
schema := n.Schema
if n.Schema == "" {
schema = defaultSchema
}
if o.Table.Catalog != "" && !matchString(o.Table.Catalog, n.Catalog) {
return false
}
if o.Table.Schema == "" && schema != "" {
return false
}
if o.Table.Schema != "" && !matchString(o.Table.Schema, schema) {
return false
}
if o.Table.Name == "" && n.Name != "" {
return false
}
if o.Table.Name != "" && !matchString(o.Table.Name, n.Name) {
return false
}
return true
}
func modelName(name string, settings *plugin.Settings) string {
if rename := settings.Rename[name]; rename != "" {
return rename
}
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.CodeGenRequest) []Enum {
var enums []Enum
for _, schema := range req.Catalog.Schemas {
if schema.Name == "pg_catalog" {
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(req *plugin.CodeGenRequest) []Struct {
var structs []Struct
for _, schema := range req.Catalog.Schemas {
if schema.Name == "pg_catalog" {
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 !req.Settings.Python.EmitExactTableNames {
structName = inflection.Singular(structName)
}
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.CodeGenRequest, 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
}
func sameTableName(tableID, f *plugin.Identifier, defaultSchema string) bool {
if tableID == nil {
return false
}
schema := tableID.Schema
if tableID.Schema == "" {
schema = defaultSchema
}
return tableID.Catalog == f.Catalog && schema == f.Schema && tableID.Name == f.Name
}
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(req *plugin.CodeGenRequest, 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: codegen.LowerTitle(query.Name) + "Stmt",
ConstantName: strings.ToUpper(methodName),
SQL: sqlalchemySQL(query.Text, req.Settings.Engine),
SourceName: query.Filename,
}
if len(query.Params) > 4 {
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 := 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 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 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 := &pyast.Module{
Body: []*pyast.Node{
{
Node: &pyast.Node_Comment{
Comment: &pyast.Comment{
Text: "Code generated by sqlc. DO NOT EDIT.",
},
},
},
},
}
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 {
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 := &pyast.Module{
Body: []*pyast.Node{
poet.Comment(
"Code generated by sqlc. DO NOT EDIT.",
),
},
}
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: i.Settings.Python.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() {
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() {
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.EmitSync {
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.EmitAsync {
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":