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build.go
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build.go
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package gotsrpc
import (
"errors"
"fmt"
"go/format"
"io/ioutil"
"os"
"path"
"path/filepath"
"runtime"
"sort"
"strings"
"github.com/foomo/gotsrpc/config"
"golang.org/x/tools/imports"
)
func deriveCommonJSMapping(conf *config.Config) {
replacer := strings.NewReplacer(".", "_", "/", "_", "-", "_")
for _, mapping := range conf.Mappings {
mapping.TypeScriptModule = replacer.Replace(mapping.GoPackage) //strings.Replace(strings.Replace(mapping.GoPackage, ".", "_", -1), "/", "_", -1)
}
}
func relativeFilePath(a, b string) (r string, e error) {
r, e = filepath.Rel(path.Dir(a), b)
if e != nil {
return
}
r = strings.TrimSuffix(r, ".ts")
return
}
func commonJSImports(conf *config.Config, c *code, tsFilename string) {
c.l("// hello commonjs - we need some imports - sorted in alphabetical order, by go package")
packageNames := []string{}
for packageName := range conf.Mappings {
packageNames = append(packageNames, packageName)
}
sort.Strings(packageNames)
for _, packageName := range packageNames {
importMapping := conf.Mappings[packageName]
relativePath, relativeErr := relativeFilePath(tsFilename, importMapping.Out)
if relativeErr != nil {
fmt.Println("can not derive a relative path between", tsFilename, "and", importMapping.Out, relativeErr)
os.Exit(1)
}
c.l("import * as " + importMapping.TypeScriptModule + " from './" + relativePath + "'; // " + tsFilename + " to " + importMapping.Out)
}
}
func getPathForTarget(gomod config.Namespace, goPath string, target *config.Target) (outputPath string) {
if gomod.Name != "" && strings.HasPrefix(target.Package, gomod.Name) {
relative := strings.TrimPrefix(target.Package, gomod.Name)
return path.Join(gomod.Path, relative)
} else {
return path.Join(goPath, "src", target.Package)
}
}
func Build(conf *config.Config, goPath string) {
if conf.ModuleKind == config.ModuleKindCommonJS {
deriveCommonJSMapping(conf)
}
mappedTypeScript := map[string]map[string]*code{}
// preserve alphabetic order
names := []string{}
for name := range conf.Targets {
names = append(names, name)
}
sort.Strings(names)
for name, target := range conf.Targets {
packageName := target.Package
outputPath := getPathForTarget(conf.Module, goPath, target)
fmt.Fprintf(os.Stderr, "building target %s (%s -> %s)\n", name, packageName, outputPath)
goRPCProxiesFilename := path.Join(outputPath, "gorpc.go")
goRPCClientsFilename := path.Join(outputPath, "gorpcclient.go")
goTSRPCProxiesFilename := path.Join(outputPath, "gotsrpc.go")
goTSRPCClientsFilename := path.Join(outputPath, "gotsrpcclient.go")
remove := func(filename string) {
_, err := os.Stat(filename)
if err == nil {
fmt.Fprintln(os.Stderr, " removing existing", filename)
os.Remove(filename)
}
}
remove(goRPCProxiesFilename)
remove(goRPCClientsFilename)
remove(goTSRPCProxiesFilename)
remove(goTSRPCClientsFilename)
workDirectory, err := os.Getwd()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
vendorDirectory := path.Join(workDirectory, "vendor")
goPaths := []string{goPath, runtime.GOROOT()}
if _, err := os.Stat(vendorDirectory); !os.IsNotExist(err) {
goPaths = append(goPaths, vendorDirectory)
}
pkgName, services, structs, scalars, constants, err := Read(goPaths, conf.Module, packageName, target.Services)
if err != nil {
fmt.Fprintln(os.Stderr, "\t an error occured while trying to understand your code: ", err)
os.Exit(2)
}
if target.Out != "" {
ts, err := RenderTypeScriptServices(conf.ModuleKind, conf.TSClientFlavor, services, conf.Mappings, scalars, structs, target)
if err != nil {
fmt.Fprintln(os.Stderr, " could not generate ts code", err)
os.Exit(3)
}
if conf.ModuleKind == config.ModuleKindCommonJS {
tsClientCode := newCode(" ")
commonJSImports(conf, tsClientCode, target.Out)
tsClientCode.l("").l("")
ts = tsClientCode.string() + ts
}
// fmt.Fprintln(os.Stdout, ts)
updateErr := updateCode(target.Out, getTSHeaderComment()+ts)
if updateErr != nil {
fmt.Fprintln(os.Stderr, " could not write service file", target.Out, updateErr)
os.Exit(3)
}
err = renderTypescriptStructsToPackages(conf.ModuleKind, structs, conf.Mappings, constants, scalars, mappedTypeScript)
if err != nil {
fmt.Fprintln(os.Stderr, "struct gen err for target", name, err)
os.Exit(4)
}
}
formatAndWrite := func(code string, filename string) {
formattedGoBytes, formattingError := format.Source([]byte(code))
if formattingError == nil {
code = string(formattedGoBytes)
} else {
fmt.Fprintln(os.Stderr, " could not format go ts rpc proxies code", formattingError)
}
codeBytes, errProcessImports := imports.Process(filename, []byte(code), nil)
if errProcessImports != nil {
fmt.Fprintln(
os.Stderr,
" goimports does not like the generated code: ",
errProcessImports,
", this is the code: ",
code,
)
os.Exit(5)
}
writeErr := ioutil.WriteFile(filename, codeBytes, 0644)
if writeErr != nil {
fmt.Fprintln(os.Stderr, " could not write go source to file", writeErr)
os.Exit(5)
}
}
if len(target.TSRPC) > 0 {
goTSRPCProxiesCode, goerr := RenderGoTSRPCProxies(services, packageName, pkgName, target)
if goerr != nil {
fmt.Fprintln(os.Stderr, " could not generate go ts rpc proxies code in target", name, goerr)
os.Exit(4)
}
formatAndWrite(goTSRPCProxiesCode, goTSRPCProxiesFilename)
goTSRPCClientsCode, goerr := RenderGoTSRPCClients(services, packageName, pkgName, target)
if goerr != nil {
fmt.Fprintln(os.Stderr, " could not generate go ts rpc clients code in target", name, goerr)
os.Exit(4)
}
formatAndWrite(goTSRPCClientsCode, goTSRPCClientsFilename)
}
if len(target.GoRPC) > 0 {
goRPCProxiesCode, goerr := RenderGoRPCProxies(services, packageName, pkgName, target)
if goerr != nil {
fmt.Fprintln(os.Stderr, " could not generate go rpc proxies code in target", name, goerr)
os.Exit(4)
}
formatAndWrite(goRPCProxiesCode, goRPCProxiesFilename)
goRPCClientsCode, goerr := RenderGoRPCClients(services, packageName, pkgName, target)
if goerr != nil {
fmt.Fprintln(os.Stderr, " could not generate go rpc clients code in target", name, goerr)
os.Exit(4)
}
formatAndWrite(goRPCClientsCode, goRPCClientsFilename)
}
if len(target.PHPRPC) > 0 {
phpRPCClientsCode, goerr := RenderPHPRPCClients(services, target)
if goerr != nil {
fmt.Fprintln(os.Stderr, " could not generate php rpc clients code in target", name, goerr)
os.Exit(4)
}
for filename, code := range phpRPCClientsCode {
updateCode(filename, code)
}
}
}
for goPackage, mappedStructsMap := range mappedTypeScript {
mapping, ok := conf.Mappings[goPackage]
if !ok {
fmt.Fprintln(os.Stderr, "reverse mapping error in struct generation for package", goPackage)
os.Exit(6)
}
fmt.Fprintln(os.Stderr, "building structs for go package", goPackage, "to ts module", mapping.TypeScriptModule, "in file", mapping.Out)
moduleCode := newCode(" ")
structIndent := -1
if conf.ModuleKind == config.ModuleKindCommonJS {
structIndent = -3
commonJSImports(conf, moduleCode, mapping.Out)
} else {
moduleCode.l("module " + mapping.TypeScriptModule + " {").ind(1)
}
structNames := []string{"___goConstants"}
for structName := range mappedStructsMap {
structNames = append(structNames, structName)
}
sort.Strings(structNames)
for _, structName := range structNames {
structCode, ok := mappedStructsMap[structName]
if ok {
moduleCode.app(structCode.ind(structIndent).l("").string())
}
}
if conf.ModuleKind == config.ModuleKindCommonJS {
moduleCode.l("// end of common js")
} else {
moduleCode.ind(-1).l("}")
}
updateErr := updateCode(mapping.Out, getTSHeaderComment()+moduleCode.string())
if updateErr != nil {
fmt.Fprintln(os.Stderr, " failed to update code in", mapping.Out, updateErr)
}
}
}
func updateCode(file string, code string) error {
if len(file) > 0 {
if file[0] == '~' {
home := os.Getenv("HOME")
if len(home) == 0 {
return errors.New("could not resolve home dir")
}
file = path.Join(home, file[1:])
}
}
errMkdirAll := os.MkdirAll(path.Dir(file), 0755)
if errMkdirAll != nil {
return errMkdirAll
}
oldCode, _ := ioutil.ReadFile(file)
if string(oldCode) != code {
fmt.Println(" writing file", file)
return ioutil.WriteFile(file, []byte(code), 0644)
}
fmt.Println(" update file not necessary - unchanged", file)
return nil
}