/
testrig.go
194 lines (166 loc) · 5.07 KB
/
testrig.go
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// Package testrig provides tools for generating standalone test environment for sysl generated services
package testrig
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"text/template"
"github.com/anz-bank/sysl/pkg/sysl"
"github.com/anz-bank/sysl/pkg/syslutil"
"github.com/ghodss/yaml"
"github.com/spf13/afero"
)
// GenerateRig creates full set of files required to start up a test rig
// for every service, it creates main.go (optionally with DB connection) and a dockerfile to containerize it
// if the service contains DB tables, it creates sidecar postgres container and creates a schema there
// finally, it creates docker-compose.yml at the point of all (likely your project's root)
// that joins all containerized services
func GenerateRig(fs afero.Fs, templateFile string, outputDir string, modules []*sysl.Module) error {
serviceMap, err := readUserData(fs, templateFile)
if err != nil {
return err
}
applications := make(map[string]*sysl.Application)
for _, module := range modules {
for appName, app := range module.GetApps() {
applications[appName] = app
}
}
composeServices := make(map[string]interface{})
for serviceName, serviceTmpl := range serviceMap {
if err := fs.MkdirAll(filepath.Join(outputDir, serviceName), os.ModePerm); err != nil {
return err
}
if err := generateMain(fs, serviceName, serviceTmpl, outputDir, appNeedsDB(applications[serviceName])); err != nil {
return err
}
if err := generateDockerfile(fs, serviceName, serviceTmpl, outputDir); err != nil {
return err
}
var dependencies []string
if appNeedsDB(applications[serviceName]) {
dbServiceName := serviceName + "_db"
composeServices[dbServiceName] = generateDBService(serviceName)
dependencies = []string{dbServiceName}
}
composeServices[serviceName] = generateAppService(&generateAppServiceInput{
ServiceName: serviceName,
Vars: serviceTmpl,
OutputDir: outputDir,
DependsOn: dependencies,
})
}
return generateCompose(fs, composeServices)
}
func appNeedsDB(app *sysl.Application) bool {
if app == nil {
return false
}
patterns := syslutil.MakeStrSetFromAttr("patterns", app.Attrs)
return patterns.Contains("DB")
}
func readUserData(fs afero.Fs, templateFileName string) (ServiceVarsMap, error) {
templateFile, err := fs.Open(templateFileName)
if err != nil {
return nil, err
}
defer templateFile.Close()
byteValue, err := ioutil.ReadAll(templateFile)
if err != nil {
return nil, err
}
var vars ServiceVarsMap
if err := json.Unmarshal(byteValue, &vars); err != nil {
return nil, err
}
return vars, nil
}
type generateAppServiceInput struct {
ServiceName string
Vars ServiceVars
OutputDir string
DependsOn []string
}
func generateAppService(input *generateAppServiceInput) map[string]interface{} {
return map[string]interface{}{
"build": map[string]interface{}{
"context": ".",
"dockerfile": filepath.Join(input.OutputDir, input.ServiceName, "Dockerfile"),
},
"ports": []string{fmt.Sprintf("%v:%v", input.Vars.Port, input.Vars.Port)},
"depends_on": input.DependsOn,
}
}
func generateDBService(serviceName string) map[string]interface{} {
return map[string]interface{}{
"image": "postgres:latest",
"ports": []string{"5432:5432"},
"volumes": []string{
fmt.Sprintf("../gen/%v/%v.sql:/docker-entrypoint-initdb.d/%v.sql", serviceName, serviceName, serviceName),
},
"environment": map[string]string{
"POSTGRES_USER": "someuser",
"POSTGRES_PASSWORD": "somepassword",
"POSTGRES_DB": "somedb",
},
}
}
func generateCompose(fs afero.Fs, composeServices map[string]interface{}) error {
output, err := fs.Create("docker-compose.yml")
if err != nil {
return err
}
defer output.Close()
data := map[string]interface{}{
"version": "3.3",
"services": composeServices,
}
dataRaw, err := yaml.Marshal(data)
if err != nil {
return err
}
if _, err := output.Write(dataRaw); err != nil {
return err
}
return output.Sync()
}
func processTemplate(file afero.File, resource string, data ServiceVars, outputDir string) error {
tmpl, err := template.New("servicesData").Parse(resource)
if err != nil {
return err
}
userData := struct {
OutputDir string
Service ServiceVars
}{
OutputDir: outputDir,
Service: data,
}
if err := tmpl.Execute(file, userData); err != nil {
return err
}
return file.Sync()
}
func generateMain(fs afero.Fs, serviceName string, serviceVars ServiceVars, outputDir string, needDB bool) error {
output, err := fs.Create(filepath.Join(outputDir, serviceName, "main.go"))
if err != nil {
return err
}
defer output.Close()
mainTemplate := GetMainStub()
if needDB {
mainTemplate = GetMainDBStub()
}
return processTemplate(output, mainTemplate, serviceVars, outputDir)
}
func generateDockerfile(fs afero.Fs, serviceName string, serviceVars ServiceVars, outputDir string) error {
output, err := fs.Create(filepath.Join(outputDir, serviceName, "Dockerfile"))
if err != nil {
return err
}
defer output.Close()
dockerTemplate := GetDockerfileStub()
return processTemplate(output, dockerTemplate, serviceVars, outputDir)
}