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generator.go
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generator.go
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package gen
import (
"bytes"
"embed"
"fmt"
"github.com/mohaijiang/agent-go/candid"
"github.com/mohaijiang/agent-go/candid/did"
"io"
"io/fs"
"strings"
"text/template"
)
const (
templatesDir = "templates"
)
var (
//go:embed templates/*
files embed.FS
templates map[string]*template.Template
)
func funcName(prefix, name string) string {
if strings.HasPrefix(name, "\"") {
name = name[1 : len(name)-1]
}
var str string
for _, p := range strings.Split(name, "_") {
str += strings.ToUpper(string(p[0])) + p[1:]
}
if prefix != "" {
return fmt.Sprintf("%s.%s", prefix, str)
}
return str
}
func init() {
if templates == nil {
templates = make(map[string]*template.Template)
}
tmplFiles, err := fs.ReadDir(files, templatesDir)
if err != nil {
panic(err)
}
for _, tmpl := range tmplFiles {
if tmpl.IsDir() {
continue
}
pt, err := template.ParseFS(files, templatesDir+"/"+tmpl.Name())
if err != nil {
panic(err)
}
templates[strings.TrimSuffix(tmpl.Name(), ".gotmpl")] = pt
}
}
func rawName(name string) string {
if strings.HasPrefix(name, "\"") {
return name[1 : len(name)-1]
}
return name
}
// Generator is a generator for a given service description.
type Generator struct {
AgentName string
ModulePath string
CanisterName string
PackageName string
ServiceDescription did.Description
usedIDL bool
}
// NewGenerator creates a new generator for the given service description.
func NewGenerator(agentName, canisterName, packageName string, rawDID []byte) (*Generator, error) {
desc, err := candid.ParseDID(rawDID)
if err != nil {
return nil, err
}
return &Generator{
AgentName: agentName,
CanisterName: canisterName,
PackageName: packageName,
ServiceDescription: desc,
}, nil
}
func (g *Generator) Generate() ([]byte, error) {
var definitions []agentArgsDefinition
for _, definition := range g.ServiceDescription.Definitions {
switch definition := definition.(type) {
case did.Type:
definitions = append(definitions, agentArgsDefinition{
Name: funcName("", definition.Id),
Type: g.dataToString("", definition.Data),
})
}
}
var methods []agentArgsMethod
for _, service := range g.ServiceDescription.Services {
for _, method := range service.Methods {
name := rawName(method.Name)
f := method.Func
var argumentTypes []agentArgsMethodArgument
for i, t := range f.ArgTypes {
var n string
if (t.Name != nil) && (*t.Name != "") {
n = *t.Name
} else {
n = fmt.Sprintf("arg%d", i)
}
argumentTypes = append(argumentTypes, agentArgsMethodArgument{
Name: n,
Type: g.dataToString("", t.Data),
})
}
var returnTypes []string
for _, t := range f.ResTypes {
returnTypes = append(returnTypes, g.dataToString("", t.Data))
}
typ := "Call"
if f.Annotation != nil && *f.Annotation == did.AnnQuery {
typ = "Query"
}
methods = append(methods, agentArgsMethod{
RawName: name,
Name: funcName("", name),
Type: typ,
ArgumentTypes: argumentTypes,
ReturnTypes: returnTypes,
})
}
}
t, ok := templates["agent"]
if !ok {
return nil, fmt.Errorf("template not found")
}
var tmpl bytes.Buffer
if err := t.Execute(&tmpl, agentArgs{
AgentName: g.AgentName,
CanisterName: g.CanisterName,
PackageName: g.PackageName,
UsedIDL: g.usedIDL,
Definitions: definitions,
Methods: methods,
}); err != nil {
return nil, err
}
return io.ReadAll(&tmpl)
}
func (g *Generator) GenerateMock() ([]byte, error) {
var methods []agentArgsMethod
for _, service := range g.ServiceDescription.Services {
for _, method := range service.Methods {
name := rawName(method.Name)
f := method.Func
var argumentTypes []agentArgsMethodArgument
for i, t := range f.ArgTypes {
var n string
if (t.Name != nil) && (*t.Name != "") {
n = *t.Name
} else {
n = fmt.Sprintf("arg%d", i)
}
argumentTypes = append(argumentTypes, agentArgsMethodArgument{
Name: n,
Type: g.dataToString(g.PackageName, t.Data),
})
}
var returnTypes []string
for _, t := range f.ResTypes {
returnTypes = append(returnTypes, g.dataToString(g.PackageName, t.Data))
}
typ := "Call"
if f.Annotation != nil && *f.Annotation == did.AnnQuery {
typ = "Query"
}
methods = append(methods, agentArgsMethod{
RawName: name,
Name: funcName("", name),
Type: typ,
ArgumentTypes: argumentTypes,
ReturnTypes: returnTypes,
})
}
}
t, ok := templates["agent_test"]
if !ok {
return nil, fmt.Errorf("template not found")
}
var tmpl bytes.Buffer
if err := t.Execute(&tmpl, agentMockArgs{
AgentName: g.AgentName,
CanisterName: g.CanisterName,
PackageName: g.PackageName,
ModulePath: g.ModulePath,
UsedIDL: g.usedIDL,
Methods: methods,
}); err != nil {
return nil, err
}
return io.ReadAll(&tmpl)
}
func (g *Generator) dataToString(prefix string, data did.Data) string {
switch t := data.(type) {
case did.Blob:
return "[]byte"
case did.DataId:
return funcName(prefix, string(t))
case did.Func:
return "struct { /* NOT SUPPORTED */ }"
case did.Optional:
return fmt.Sprintf("*%s", g.dataToString(prefix, t.Data))
case did.Primitive:
switch t {
case "nat8", "nat16", "nat32", "nat64":
return strings.ReplaceAll(data.String(), "nat", "uint")
case "bool", "float32", "float64", "int8", "int16", "int32", "int64":
return data.String()
case "int":
g.usedIDL = true
return "idl.Int"
case "nat":
g.usedIDL = true
return "idl.Nat"
case "text":
return "string"
case "null":
return "struct{}"
default:
panic(fmt.Sprintf("unknown primitive: %s", t))
}
case did.Principal:
return "principal.Principal"
case did.Record:
var sizeName int
var sizeType int
var records []struct {
originalName string
name string
typ string
}
for i, field := range t {
originalName := fmt.Sprintf("field%d", i)
name := originalName
if n := field.Name; n != nil {
originalName = *n
name = funcName("", *n)
}
if l := len(name); l > sizeName {
sizeName = l
}
var typ string
if field.Data != nil {
typ = g.dataToString(prefix, *field.Data)
} else {
typ = funcName(prefix, *field.NameData)
}
for _, typ := range strings.Split(typ, "\n") {
if l := len(typ); l > sizeType {
sizeType = l
}
}
records = append(records, struct {
originalName string
name string
typ string
}{
originalName: originalName,
name: name,
typ: typ,
})
}
var record string
for _, r := range records {
tag := r.originalName
if strings.HasPrefix(r.typ, "*") {
tag += ",omitempty" // optional value.
}
record += fmt.Sprintf("\t%-*s %-*s `ic:\"%s\"`\n", sizeName, r.name, sizeType, r.typ, tag)
}
return fmt.Sprintf("struct {\n%s}", record)
case did.Variant:
var sizeName int
var sizeType int
var records []struct {
originalName string
name string
typ string
}
for _, field := range t {
if field.Name == nil {
name := *field.NameData
if l := len(name); l > sizeName {
sizeName = l
}
if 8 > sizeType {
sizeType = 8
}
records = append(records, struct {
originalName string
name string
typ string
}{originalName: name, name: name, typ: "struct{}"})
} else {
name := funcName("", *field.Name)
if l := len(name); l > sizeName {
sizeName = l
}
var typ string
if field.Data != nil {
typ = g.dataToString(prefix, *field.Data)
} else {
typ = funcName(prefix, *field.NameData)
}
for _, typ := range strings.Split(typ, "\n") {
if l := len(typ); l > sizeType {
sizeType = l
}
}
records = append(records, struct {
originalName string
name string
typ string
}{
originalName: *field.Name,
name: name,
typ: typ,
})
}
}
var record string
for _, r := range records {
record += fmt.Sprintf("\t%-*s *%-*s `ic:\"%s,variant\"`\n", sizeName, r.name, sizeType, r.typ, r.originalName)
}
return fmt.Sprintf("struct {\n%s}", record)
case did.Vector:
return fmt.Sprintf("[]%s", g.dataToString(prefix, t.Data))
default:
panic(fmt.Sprintf("unknown type: %T", t))
}
}
type agentArgs struct {
AgentName string
CanisterName string
PackageName string
UsedIDL bool
Definitions []agentArgsDefinition
Methods []agentArgsMethod
}
type agentArgsDefinition struct {
Name string
Type string
}
type agentArgsMethod struct {
RawName string
Name string
Type string
ArgumentTypes []agentArgsMethodArgument
ReturnTypes []string
}
type agentArgsMethodArgument struct {
Name string
Type string
}
type agentMockArgs struct {
AgentName string
CanisterName string
PackageName string
ModulePath string
UsedIDL bool
Methods []agentArgsMethod
}