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gogen.go
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gogen.go
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// Copyright (C) 2022 Storj Labs, Inc.
// See LICENSE for copying information.
package apigen
import (
"fmt"
"go/format"
"os"
"reflect"
"sort"
"strings"
"time"
"github.com/zeebo/errs"
"golang.org/x/text/cases"
"golang.org/x/text/language"
"storj.io/common/uuid"
)
// DateFormat is the layout of dates passed into and out of the API.
const DateFormat = "2006-01-02T15:04:05.999Z"
// MustWriteGo writes generated Go code into a file.
func (a *API) MustWriteGo(path string) {
generated, err := a.generateGo()
if err != nil {
panic(errs.Wrap(err))
}
err = os.WriteFile(path, generated, 0644)
if err != nil {
panic(errs.Wrap(err))
}
}
// generateGo generates api code and returns an output.
func (a *API) generateGo() ([]byte, error) {
var result string
pf := func(format string, a ...interface{}) {
result += fmt.Sprintf(format+"\n", a...)
}
getPackageName := func(path string) string {
pathPackages := strings.Split(path, "/")
return pathPackages[len(pathPackages)-1]
}
imports := struct {
All map[string]bool
Standard []string
External []string
Internal []string
}{
All: make(map[string]bool),
}
i := func(paths ...string) {
for _, path := range paths {
if path == "" || getPackageName(path) == a.PackageName {
continue
}
if _, ok := imports.All[path]; ok {
continue
}
imports.All[path] = true
var slice *[]string
switch {
case !strings.Contains(path, "."):
slice = &imports.Standard
case strings.HasPrefix(path, "storj.io"):
slice = &imports.Internal
default:
slice = &imports.External
}
*slice = append(*slice, path)
}
}
for _, group := range a.EndpointGroups {
for _, method := range group.endpoints {
if method.Request != nil {
i(getElementaryType(reflect.TypeOf(method.Request)).PkgPath())
}
if method.Response != nil {
i(getElementaryType(reflect.TypeOf(method.Response)).PkgPath())
}
}
}
for _, group := range a.EndpointGroups {
i("github.com/zeebo/errs")
pf("var Err%sAPI = errs.Class(\"%s %s api\")", cases.Title(language.Und).String(group.Prefix), a.PackageName, group.Prefix)
}
pf("")
params := make(map[*fullEndpoint][]Param)
for _, group := range a.EndpointGroups {
pf("type %sService interface {", group.Name)
for _, e := range group.endpoints {
params[e] = append(e.PathParams, e.QueryParams...)
var paramStr string
for i, param := range params[e] {
paramStr += param.Name
if i == len(params[e])-1 || param.Type != params[e][i+1].Type {
paramStr += " " + param.Type.String()
}
paramStr += ", "
}
if e.Request != nil {
paramStr += "request " + reflect.TypeOf(e.Request).String() + ", "
}
i("context", "storj.io/storj/private/api")
if e.Response != nil {
responseType := reflect.TypeOf(e.Response)
returnParam := a.handleTypesPackage(responseType)
if responseType == getElementaryType(responseType) {
returnParam = "*" + returnParam
}
pf("%s(ctx context.Context, "+paramStr+") (%s, api.HTTPError)", e.MethodName, returnParam)
} else {
pf("%s(ctx context.Context, "+paramStr+") (api.HTTPError)", e.MethodName)
}
}
pf("}")
pf("")
}
for _, group := range a.EndpointGroups {
i("go.uber.org/zap", "github.com/spacemonkeygo/monkit/v3")
pf("// %sHandler is an api handler that exposes all %s related functionality.", group.Name, group.Prefix)
pf("type %sHandler struct {", group.Name)
pf("log *zap.Logger")
pf("mon *monkit.Scope")
pf("service %sService", group.Name)
pf("auth api.Auth")
pf("}")
pf("")
}
for _, group := range a.EndpointGroups {
i("github.com/gorilla/mux")
pf(
"func New%s(log *zap.Logger, mon *monkit.Scope, service %sService, router *mux.Router, auth api.Auth) *%sHandler {",
group.Name,
group.Name,
group.Name,
)
pf("handler := &%sHandler{", group.Name)
pf("log: log,")
pf("mon: mon,")
pf("service: service,")
pf("auth: auth,")
pf("}")
pf("")
pf("%sRouter := router.PathPrefix(\"/api/v0/%s\").Subrouter()", group.Prefix, group.Prefix)
for _, endpoint := range group.endpoints {
handlerName := "handle" + endpoint.MethodName
pf("%sRouter.HandleFunc(\"%s\", handler.%s).Methods(\"%s\")", group.Prefix, endpoint.Path, handlerName, endpoint.Method)
}
pf("")
pf("return handler")
pf("}")
pf("")
}
for _, group := range a.EndpointGroups {
for _, endpoint := range group.endpoints {
i("net/http")
pf("")
handlerName := "handle" + endpoint.MethodName
pf("func (h *%sHandler) %s(w http.ResponseWriter, r *http.Request) {", group.Name, handlerName)
pf("ctx := r.Context()")
pf("var err error")
pf("defer h.mon.Task()(&ctx)(&err)")
pf("")
pf("w.Header().Set(\"Content-Type\", \"application/json\")")
pf("")
if err := handleParams(pf, i, endpoint.PathParams, endpoint.QueryParams); err != nil {
return nil, err
}
if endpoint.Request != nil {
handleBody(pf, endpoint.Request)
}
if !endpoint.NoCookieAuth || !endpoint.NoAPIAuth {
pf("ctx, err = h.auth.IsAuthenticated(ctx, r, %v, %v)", !endpoint.NoCookieAuth, !endpoint.NoAPIAuth)
pf("if err != nil {")
if !endpoint.NoCookieAuth {
pf("h.auth.RemoveAuthCookie(w)")
}
pf("api.ServeError(h.log, w, http.StatusUnauthorized, err)")
pf("return")
pf("}")
pf("")
}
var methodFormat string
if endpoint.Response != nil {
methodFormat = "retVal, httpErr := h.service.%s(ctx, "
} else {
methodFormat = "httpErr := h.service.%s(ctx, "
}
for _, param := range params[endpoint] {
methodFormat += param.Name + ", "
}
if endpoint.Request != nil {
methodFormat += "payload"
}
methodFormat += ")"
pf(methodFormat, endpoint.MethodName)
pf("if httpErr.Err != nil {")
pf("api.ServeError(h.log, w, httpErr.Status, httpErr.Err)")
if endpoint.Response == nil {
pf("}")
pf("}")
continue
}
pf("return")
pf("}")
i("encoding/json")
pf("")
pf("err = json.NewEncoder(w).Encode(retVal)")
pf("if err != nil {")
pf("h.log.Debug(\"failed to write json %s response\", zap.Error(Err%sAPI.Wrap(err)))", endpoint.MethodName, cases.Title(language.Und).String(group.Prefix))
pf("}")
pf("}")
}
}
fileBody := result
result = ""
pf("// AUTOGENERATED BY private/apigen")
pf("// DO NOT EDIT.")
pf("")
pf("package %s", a.PackageName)
pf("")
pf("import (")
slices := [][]string{imports.Standard, imports.External, imports.Internal}
for sn, slice := range slices {
sort.Strings(slice)
for pn, path := range slice {
pf(`"%s"`, path)
if pn == len(slice)-1 && sn < len(slices)-1 {
pf("")
}
}
}
pf(")")
pf("")
if _, ok := imports.All["time"]; ok {
pf("const dateLayout = \"%s\"", DateFormat)
pf("")
}
result += fileBody
output, err := format.Source([]byte(result))
if err != nil {
return nil, err
}
return output, nil
}
// handleTypesPackage handles the way some type is used in generated code.
// If type is from the same package then we use only type's name.
// If type is from external package then we use type along with its appropriate package name.
func (a *API) handleTypesPackage(t reflect.Type) string {
if strings.HasPrefix(t.String(), a.PackageName) {
return t.Elem().Name()
}
return t.String()
}
// handleParams handles parsing of URL path parameters or query parameters.
func handleParams(pf func(format string, a ...interface{}), i func(paths ...string), pathParams, queryParams []Param) error {
pErrCheck := func() {
pf("if err != nil {")
pf("api.ServeError(h.log, w, http.StatusBadRequest, err)")
pf("return")
pf("}")
}
for _, params := range []*[]Param{&queryParams, &pathParams} {
for _, param := range *params {
varName := param.Name
if param.Type.Kind() != reflect.String {
varName += "Param"
}
switch params {
case &queryParams:
pf("%s := r.URL.Query().Get(\"%s\")", varName, param.Name)
pf("if %s == \"\" {", varName)
pf("api.ServeError(h.log, w, http.StatusBadRequest, errs.New(\"parameter '%s' can't be empty\"))", param.Name)
pf("return")
pf("}")
pf("")
case &pathParams:
pf("%s, ok := mux.Vars(r)[\"%s\"]", varName, param.Name)
pf("if !ok {")
pf("api.ServeError(h.log, w, http.StatusBadRequest, errs.New(\"missing %s route param\"))", param.Name)
pf("return")
pf("}")
pf("")
}
switch param.Type {
case reflect.TypeOf(uuid.UUID{}):
i("storj.io/common/uuid")
pf("%s, err := uuid.FromString(%s)", param.Name, varName)
pErrCheck()
case reflect.TypeOf(time.Time{}):
i("time")
pf("%s, err := time.Parse(dateLayout, %s)", param.Name, varName)
pErrCheck()
default:
switch param.Type.Kind() {
case reflect.String:
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
i("strconv")
convName := varName
if param.Type.Kind() != reflect.Uint64 {
convName += "U64"
}
bits := param.Type.Bits()
if param.Type.Kind() == reflect.Uint {
bits = 32
}
pf("%s, err := strconv.ParseUint(%s, 10, %d)", convName, varName, bits)
pErrCheck()
if param.Type.Kind() != reflect.Uint64 {
pf("%s := %s(%s)", param.Name, param.Type.String(), convName)
}
default:
return errs.New("Unsupported parameter type \"%s\"", param.Type)
}
}
pf("")
}
}
return nil
}
// handleBody handles request body.
func handleBody(pf func(format string, a ...interface{}), body interface{}) {
pf("payload := %s{}", reflect.TypeOf(body).String())
pf("if err = json.NewDecoder(r.Body).Decode(&payload); err != nil {")
pf("api.ServeError(h.log, w, http.StatusBadRequest, err)")
pf("return")
pf("}")
pf("")
}
// getElementaryType simplifies a Go type.
func getElementaryType(t reflect.Type) reflect.Type {
switch t.Kind() {
case reflect.Array, reflect.Chan, reflect.Map, reflect.Ptr, reflect.Slice:
return getElementaryType(t.Elem())
default:
return t
}
}