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generator.go
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package generator
import (
"embed"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"net/http"
"os"
"os/exec"
"path"
"slices"
"sort"
"strconv"
"strings"
"text/template"
"github.com/getkin/kin-openapi/openapi3"
)
//go:embed templates
var templatesFS embed.FS
var (
templateNameSDK = []string{"sdk.go.templ", "sdk_test.go.templ"}
templateNameMock = []string{"mockhttp.go.templ", "mockhttp_test.go.templ"}
templateNameStatic = []string{"go.mod.templ", "doc.go.templ", "error.go.templ"}
)
// Config generator configurations.
type Config struct {
// OpenAPIReader defines the OpenAPI specs input.
OpenAPIReader io.Reader
// PathOutput defines the path to store generated files.
PathOutput string
}
// Run executes code generation using the OpenAPI spec.
func Run(cfg Config) error {
templates := template.Must(template.ParseFS(templatesFS, "templates/*"))
specBytes, err := io.ReadAll(cfg.OpenAPIReader)
if err != nil {
return errors.New("cannot read OpenAPI spec: " + err.Error())
}
var spec openAPISpec
if err := spec.UnmarshalJSON(specBytes); err != nil {
return errors.New("cannot parse OpenAPI spec: " + err.Error())
}
orderedEndpointRoutes, err := extractOrderedEndpointRoutes(specBytes)
if err != nil {
return errors.New("cannot extract ordered list of endpoints from the OpenAPI spec: " + err.Error())
}
tempInputSDK, tempInputMock := extractSpecs(spec, orderedEndpointRoutes)
if err := generateFiles(templates, templateNameSDK, tempInputSDK, cfg.PathOutput); err != nil {
return fmt.Errorf("could not generate sdk files: %w", err)
}
if err := generateFiles(templates, templateNameMock, tempInputMock, cfg.PathOutput); err != nil {
return fmt.Errorf("could not generate mock files: %w", err)
}
if err := generateFiles(templates, templateNameStatic, nil, cfg.PathOutput); err != nil {
return fmt.Errorf("could not generate static files: %w", err)
}
var e error
if v, _ := strconv.ParseBool(os.Getenv("SKIP_TEST")); !v {
e = testGeneratedCode(cfg.PathOutput)
}
if v, _ := strconv.ParseBool(os.Getenv("SKIP_FORMATTING")); !v {
e = errors.Join(e, formatGeneratedCode(cfg.PathOutput))
}
return e
}
func formatGeneratedCode(p string) error {
cmd := exec.Command("go", "fmt", ".")
cmd.Dir = p
if err := cmd.Start(); err != nil {
panic(err)
}
if err := cmd.Wait(); err != nil {
return fmt.Errorf("failed to run go fmt: %w", err)
}
return nil
}
func generateFiles(t *template.Template, templateNames []string, data any, p string) error {
for _, templateName := range templateNames {
outputFileName := strings.TrimSuffix(templateName, ".templ")
filePath := path.Join(p, outputFileName)
f, err := os.Create(filePath)
defer func() { _ = f.Close() }()
if err != nil {
return fmt.Errorf("could not open file: %s. %w", filePath, err)
}
if err := t.ExecuteTemplate(f, templateName, data); err != nil {
return fmt.Errorf("could not generate a file %s. %w", filePath, err)
}
}
return nil
}
func extractSpecs(spec openAPISpec, orderedEndpointRoutes []string) (templateInputSDK, templateInputMock) {
if len(spec.Servers) < 1 {
panic("no server spec found")
}
m := generateModels(spec)
endpoints := generateEndpointsImplementationMethods(spec, orderedEndpointRoutes)
var endpointNames = make([]string, 0, len(endpoints))
for k, _ := range endpoints {
endpointNames = append(endpointNames, k)
}
slices.Sort(endpointNames)
endpointsStr := make([]string, len(endpoints))
endpointsTestStr := make([]string, 0, len(endpoints))
models := models{}
mockResponses := map[string]map[string]mockResponse{
// hardcode based on the api spec because of complexity
"/projects": {
"POST": {
Code: "201",
Content: `{
"project": {
"maintenance_starts_at": "2023-01-02T20:03:02.273Z",
"id": "string",
"platform_id": "string",
"region_id": "string",
"name": "string",
"provisioner": "k8s-pod",
"default_endpoint_settings": {
"pg_settings": {
"additionalProp1": "string",
"additionalProp2": "string",
"additionalProp3": "string"
}
},
"pg_version": 0,
"created_at": "2023-01-02T20:03:02.273Z",
"updated_at": "2023-01-02T20:03:02.273Z",
"proxy_host": "string"
},
"connection_uris": [
{
"connection_uri": "string"
}
],
"roles": [
{
"branch_id": "string",
"name": "string",
"password": "string",
"protected": true,
"created_at": "2023-01-02T20:03:02.273Z",
"updated_at": "2023-01-02T20:03:02.273Z"
}
],
"databases": [
{
"id": 0,
"branch_id": "string",
"name": "string",
"owner_name": "string",
"created_at": "2023-01-02T20:03:02.273Z",
"updated_at": "2023-01-02T20:03:02.273Z"
}
],
"operations": [
{
"id": "a07f8772-1877-4da9-a939-3a3ae62d1d8d",
"project_id": "spring-example-302709",
"branch_id": "br-wispy-meadow-118737",
"endpoint_id": "ep-silent-smoke-806639",
"action": "create_branch",
"status": "running",
"failures_count": 0,
"created_at": "2022-11-08T23:33:16Z",
"updated_at": "2022-11-08T23:33:20Z"
},
{
"id": "d8ac46eb-a757-42b1-9907-f78322ee394e",
"project_id": "spring-example-302709",
"branch_id": "br-wispy-meadow-118737",
"endpoint_id": "ep-silent-smoke-806639",
"action": "start_compute",
"status": "finished",
"failures_count": 0,
"created_at": "2022-11-15T20:02:00Z",
"updated_at": "2022-11-15T20:02:02Z"
}
],
"branch": {
"id": "br-wispy-meadow-118737",
"project_id": "spring-example-302709",
"parent_id": "br-aged-salad-637688",
"parent_lsn": "0/1DE2850",
"name": "dev2",
"current_state": "ready",
"created_at": "2022-11-30T19:09:48Z",
"updated_at": "2022-12-01T19:53:05Z"
},
"endpoints": [
{
"host": "string",
"id": "string",
"project_id": "string",
"branch_id": "string",
"autoscaling_limit_min_cu": 0,
"autoscaling_limit_max_cu": 0,
"region_id": "string",
"type": "read_only",
"current_state": "init",
"pending_state": "init",
"settings": {
"pg_settings": {
"additionalProp1": "string",
"additionalProp2": "string",
"additionalProp3": "string"
}
},
"pooler_enabled": true,
"pooler_mode": "transaction",
"disabled": true,
"passwordless_access": true,
"last_active": "2023-01-02T20:03:02.273Z",
"created_at": "2023-01-02T20:03:02.273Z",
"updated_at": "2023-01-02T20:03:02.273Z",
"proxy_host": "string"
}
]
}`,
},
},
"/projects/{project_id}/branches": {
"POST": {
Code: "201",
Content: `{
"branch": {
"id": "br-wispy-meadow-118737",
"project_id": "spring-example-302709",
"parent_id": "br-aged-salad-637688",
"parent_lsn": "0/1DE2850",
"name": "dev2",
"current_state": "ready",
"created_at": "2022-11-30T19:09:48Z",
"updated_at": "2022-12-01T19:53:05Z"
},
"endpoints": [
{
"host": "string",
"id": "string",
"project_id": "string",
"branch_id": "string",
"autoscaling_limit_min_cu": 0,
"autoscaling_limit_max_cu": 0,
"region_id": "string",
"type": "read_only",
"current_state": "init",
"pending_state": "init",
"settings": {
"pg_settings": {
"additionalProp1": "string",
"additionalProp2": "string",
"additionalProp3": "string"
}
},
"pooler_enabled": true,
"pooler_mode": "transaction",
"disabled": true,
"passwordless_access": true,
"last_active": "2023-01-02T20:09:50.004Z",
"created_at": "2023-01-02T20:09:50.004Z",
"updated_at": "2023-01-02T20:09:50.004Z",
"proxy_host": "string"
}
],
"operations": [
{
"id": "a07f8772-1877-4da9-a939-3a3ae62d1d8d",
"project_id": "spring-example-302709",
"branch_id": "br-wispy-meadow-118737",
"endpoint_id": "ep-silent-smoke-806639",
"action": "create_branch",
"status": "running",
"failures_count": 0,
"created_at": "2022-11-08T23:33:16Z",
"updated_at": "2022-11-08T23:33:20Z"
},
{
"id": "d8ac46eb-a757-42b1-9907-f78322ee394e",
"project_id": "spring-example-302709",
"branch_id": "br-wispy-meadow-118737",
"endpoint_id": "ep-silent-smoke-806639",
"action": "start_compute",
"status": "finished",
"failures_count": 0,
"created_at": "2022-11-15T20:02:00Z",
"updated_at": "2022-11-15T20:02:02Z"
}
]
}`,
},
},
"/projects/{project_id}/operations": {
"GET": {
Code: "200",
Content: `{
"operations": [
{
"id": "a07f8772-1877-4da9-a939-3a3ae62d1d8d",
"project_id": "spring-example-302709",
"branch_id": "br-wispy-meadow-118737",
"endpoint_id": "ep-silent-smoke-806639",
"action": "create_branch",
"status": "running",
"failures_count": 0,
"created_at": "2022-11-08T23:33:16Z",
"updated_at": "2022-11-08T23:33:20Z"
},
{
"id": "d8ac46eb-a757-42b1-9907-f78322ee394e",
"project_id": "spring-example-302709",
"branch_id": "br-wispy-meadow-118737",
"endpoint_id": "ep-silent-smoke-806639",
"action": "start_compute",
"status": "finished",
"failures_count": 0,
"created_at": "2022-11-15T20:02:00Z",
"updated_at": "2022-11-15T20:02:02Z"
}
],
"pagination": {
"cursor": "string"
}
}`,
},
},
"/projects/{project_id}/branches/{branch_id}/databases": {
"GET": {
Code: "200",
Content: `{
"databases": [
{
"id": 834686,
"branch_id": "br-aged-salad-637688",
"name": "main",
"owner_name": "casey",
"created_at": "2022-11-30T18:25:15Z",
"updated_at": "2022-11-30T18:25:15Z"
},
{
"id": 834686,
"branch_id": "br-aged-salad-637688",
"name": "mydb",
"owner_name": "casey",
"created_at": "2022-10-30T17:14:13Z",
"updated_at": "2022-10-30T17:14:13Z"
}
]}`,
},
},
"/projects/{project_id}/endpoints": {
"POST": {
Code: "201",
Content: `{
"endpoint": {
"autoscaling_limit_max_cu": 1,
"autoscaling_limit_min_cu": 1,
"branch_id": "br-proud-paper-090813",
"created_at": "2022-12-03T15:37:07Z",
"current_state": "init",
"disabled": false,
"host": "ep-shrill-thunder-454069.us-east-2.aws.neon.tech",
"id": "ep-shrill-thunder-454069",
"passwordless_access": true,
"pending_state": "active",
"pooler_enabled": false,
"pooler_mode": "transaction",
"project_id": "bitter-meadow-966132",
"proxy_host": "us-east-2.aws.neon.tech",
"region_id": "aws-us-east-2",
"settings": {
"pg_settings": {}
},
"type": "read_write",
"updated_at": "2022-12-03T15:37:07Z"
},
"operations": [{
"action": "start_compute",
"branch_id": "br-proud-paper-090813",
"created_at": "2022-12-03T15:37:07Z",
"endpoint_id": "ep-shrill-thunder-454069",
"failures_count": 0,
"id": "874f8bfe-f51d-4c61-85af-a29bea73e0e2",
"project_id": "bitter-meadow-966132",
"status": "running",
"updated_at": "2022-12-03T15:37:07Z"
}]
}`,
},
},
"/projects/{project_id}/endpoints/{endpoint_id}": {
"DELETE": {
Code: "200",
Content: `{"endpoint":{"autoscaling_limit_max_cu":1,"autoscaling_limit_min_cu":1,"branch_id":"br-raspy-hill-832856","created_at":"2022-12-03T15:37:07Z","current_state":"idle","disabled":false,"host":"ep-steep-bush-777093.us-east-2.aws.neon.tech","id":"ep-steep-bush-777093","last_active":"2022-12-03T15:00:00Z","passwordless_access":true,"pooler_enabled":false,"pooler_mode":"transaction","project_id":"shiny-wind-028834","proxy_host":"us-east-2.aws.neon.tech","region_id":"aws-us-east-2","settings":{"pg_settings":{}},"type":"read_write","updated_at":"2022-12-03T15:49:10Z"},"operations":[{"action":"suspend_compute","branch_id":"br-proud-paper-090813","created_at":"2022-12-03T15:51:06Z","endpoint_id":"ep-shrill-thunder-454069","failures_count":0,"id":"fd11748e-3c68-458f-b9e3-66d409e3eef0","project_id":"bitter-meadow-966132","status":"running","updated_at":"2022-12-03T15:51:06Z"}]}`,
},
"PATCH": {
Code: "200",
Content: `{"endpoint":{"autoscaling_limit_max_cu":1,"autoscaling_limit_min_cu":1,"branch_id":"br-raspy-hill-832856","created_at":"2022-12-03T15:37:07Z","current_state":"idle","disabled":false,"host":"ep-steep-bush-777093.us-east-2.aws.neon.tech","id":"ep-steep-bush-777093","last_active":"2022-12-03T15:00:00Z","passwordless_access":true,"pooler_enabled":false,"pooler_mode":"transaction","project_id":"shiny-wind-028834","proxy_host":"us-east-2.aws.neon.tech","region_id":"aws-us-east-2","settings":{"pg_settings":{}},"type":"read_write","updated_at":"2022-12-03T15:49:10Z"},"operations":[{"action":"suspend_compute","branch_id":"br-proud-paper-090813","created_at":"2022-12-03T15:51:06Z","endpoint_id":"ep-shrill-thunder-454069","failures_count":0,"id":"fd11748e-3c68-458f-b9e3-66d409e3eef0","project_id":"bitter-meadow-966132","status":"running","updated_at":"2022-12-03T15:51:06Z"}]}`,
},
},
"/projects/{project_id}/endpoints/{endpoint_id}/start": {
"POST": {
Code: "200",
Content: `{"endpoint":{"autoscaling_limit_max_cu":1,"autoscaling_limit_min_cu":1,"branch_id":"br-raspy-hill-832856","created_at":"2022-12-03T15:37:07Z","current_state":"idle","disabled":false,"host":"ep-steep-bush-777093.us-east-2.aws.neon.tech","id":"ep-steep-bush-777093","last_active":"2022-12-03T15:00:00Z","passwordless_access":true,"pooler_enabled":false,"pooler_mode":"transaction","project_id":"shiny-wind-028834","proxy_host":"us-east-2.aws.neon.tech","region_id":"aws-us-east-2","settings":{"pg_settings":{}},"type":"read_write","updated_at":"2022-12-03T15:49:10Z"},"operations":[{"action":"start_compute","branch_id":"br-proud-paper-090813","created_at":"2022-12-03T15:51:06Z","endpoint_id":"ep-shrill-thunder-454069","failures_count":0,"id":"e061087e-3c99-4856-b9c8-6b7751a253af","project_id":"bitter-meadow-966132","status":"running","updated_at":"2022-12-03T15:51:06Z"}]}`,
},
},
"/projects/{project_id}/endpoints/{endpoint_id}/suspend": {
"POST": {
Code: "200",
Content: `{"endpoint":{"autoscaling_limit_max_cu":1,"autoscaling_limit_min_cu":1,"branch_id":"br-raspy-hill-832856","created_at":"2022-12-03T15:37:07Z","current_state":"idle","disabled":false,"host":"ep-steep-bush-777093.us-east-2.aws.neon.tech","id":"ep-steep-bush-777093","last_active":"2022-12-03T15:00:00Z","passwordless_access":true,"pooler_enabled":false,"pooler_mode":"transaction","project_id":"shiny-wind-028834","proxy_host":"us-east-2.aws.neon.tech","region_id":"aws-us-east-2","settings":{"pg_settings":{}},"type":"read_write","updated_at":"2022-12-03T15:49:10Z"},"operations":[{"action":"suspend_compute","branch_id":"br-proud-paper-090813","created_at":"2022-12-03T15:51:06Z","endpoint_id":"ep-shrill-thunder-454069","failures_count":0,"id":"e061087e-3c99-4856-b9c8-6b7751a253af","project_id":"bitter-meadow-966132","status":"running","updated_at":"2022-12-03T15:51:06Z"}]}`,
},
},
"/projects/{project_id}/branches/{branch_id}/endpoints": {
"GET": {
Code: "200",
Content: `{"endpoints":[{"autoscaling_limit_max_cu":1,"autoscaling_limit_min_cu":1,"branch_id":"br-aged-salad-637688","created_at":"2022-11-23T17:42:25Z","current_state":"idle","disabled":false,"host":"ep-little-smoke-851426.us-east-2.aws.neon.tech","id":"ep-little-smoke-851426","last_active":"2022-11-23T17:00:00Z","passwordless_access":true,"pooler_enabled":false,"pooler_mode":"transaction","project_id":"shiny-wind-028834","proxy_host":"us-east-2.aws.neon.tech","region_id":"aws-us-east-2","settings":{"pg_settings":{}},"type":"read_write","updated_at":"2022-11-30T18:25:21Z"}]}`,
},
},
"/projects/{project_id}/branches/{branch_id}/roles/{role_name}/reset_password": {
"POST": {
Code: "200",
Content: `{"operations":[{"action":"apply_config","branch_id":"br-noisy-sunset-458773","created_at":"2022-12-03T12:58:18Z","endpoint_id":"ep-small-pine-767857","failures_count":0,"id":"6bef07a0-ebca-40cd-9100-7324036cfff2","project_id":"shiny-wind-028834","status":"running","updated_at":"2022-12-03T12:58:18Z"},{"action":"suspend_compute","branch_id":"br-noisy-sunset-458773","created_at":"2022-12-03T12:58:18Z","endpoint_id":"ep-small-pine-767857","failures_count":0,"id":"16b5bfca-4697-4194-a338-d2cdc9aca2af","project_id":"shiny-wind-028834","status":"scheduling","updated_at":"2022-12-03T12:58:18Z"}],"role":{"branch_id":"br-noisy-sunset-458773","created_at":"2022-12-03T12:39:39Z","name":"sally","password":"ClfD0aVuK3eK","protected":false,"updated_at":"2022-12-03T12:58:18Z"}}`,
},
},
"/projects/{project_id}/branches/{branch_id}/roles": {
"POST": {
Code: "201",
Content: `{"operations":[{"action":"apply_config","branch_id":"br-noisy-sunset-458773","created_at":"2022-12-03T11:58:29Z","endpoint_id":"ep-small-pine-767857","failures_count":0,"id":"2c2be371-d5ac-4db5-8b68-79f05e8bc287","project_id":"shiny-wind-028834","status":"running","updated_at":"2022-12-03T11:58:29Z"}],"role":{"branch_id":"br-noisy-sunset-458773","created_at":"2022-12-03T11:58:29Z","name":"sally","password":"Onf1AjayKwe0","protected":false,"updated_at":"2022-12-03T11:58:29Z"}}`,
},
},
}
for i, name := range endpointNames {
s := endpoints[name]
endpointsStr[i] = s.generateMethodImplementation()
if !skipTest(s.Route) {
endpointsTestStr = append(endpointsTestStr, s.generateMethodImplementationTest())
if _, ok := mockResponses[s.Route]; !ok {
mockResponses[s.Route] = map[string]mockResponse{}
}
if _, ok := mockResponses[s.Route][s.Method]; !ok {
mockResponses[s.Route][s.Method] = s.generateMockResponse()
}
}
if s.ResponseStruct != nil {
if s.ResponseStruct.generated {
m[s.ResponseStruct.name] = *s.ResponseStruct
}
filterModels(m, models, *s.ResponseStruct)
}
if s.RequestBodyStruct != nil {
if s.RequestBodyStruct.generated {
m[s.RequestBodyStruct.name] = *s.RequestBodyStruct
}
filterModels(m, models, *s.RequestBodyStruct)
}
// filter models based on the parameters
for _, param := range slices.Concat(s.RequestParametersPath, s.RequestParametersQuery) {
mm, ok := m[param.v]
if ok {
filterModels(m, models, mm)
}
}
}
return templateInputSDK{
ServerURL: spec.Servers[0].URL,
EndpointsImplementation: endpointsStr,
Types: models.generateCode(),
EndpointsImplementationTest: endpointsTestStr,
}, templateInputMock{
EndpointsResponseExample: mockResponses,
}
}
func skipTest(route string) bool {
skipTest := map[string]struct{}{
"/projects/{project_id}/permissions": {},
"/projects/{project_id}/permissions/{permission_id}": {},
}
_, found := skipTest[route]
return found
}
func filterModels(modelsSource models, output models, m model) {
name := strings.NewReplacer("[", "", "]", "").Replace(m.name)
v, ok := modelsSource[name]
if !ok {
return
}
output[v.name] = v
for child := range v.children {
filterModels(modelsSource, output, model{name: child})
}
for _, field := range v.fields {
filterModels(modelsSource, output, model{name: field.v})
}
}
func testGeneratedCode(p string) error {
cmd := exec.Command("go", "test", ".")
cmd.Dir = p
if err := cmd.Start(); err != nil {
panic(err)
}
if err := cmd.Wait(); err != nil {
return fmt.Errorf("failed test: %w", err)
}
return nil
}
type openAPISpec struct {
openapi3.T
}
type templateInputSDK struct {
ServerURL string
EndpointsImplementation []string
Types []string
EndpointsImplementationTest []string
}
type templateInputMock struct {
EndpointsResponseExample map[string]map[string]mockResponse
}
type endpointImplementation struct {
Name string
Method string
Route string
Description string
RequestBodyRequires bool
RequestBodyStruct *model
RequestBodyStructExample interface{}
ResponseStruct *model
RequestParametersPath []field
RequestParametersQuery []field
ResponsePositivePathExample interface{}
ResponsePositivePathStatusCode string
}
func (e endpointImplementation) functionDescription() string {
if e.Description == "" {
return ""
}
o := "// " + e.Name
for i, s := range strings.Split(e.Description, "\n") {
if ss := strings.TrimSpace(s); ss != "" {
if i > 0 {
o += "\n// " + ss
} else {
o += " " + ss
}
}
}
return o
}
func (e endpointImplementation) generateMethodImplementation() string {
var o string
if e.Description != "" {
o += e.functionDescription() + "\n"
}
o += "func (c Client) " + e.generateMethodHeader() + " {\n"
reqObj := "nil"
if e.RequestBodyStruct != nil {
reqObj = "cfg"
}
var query string
if len(e.RequestParametersQuery) > 0 {
query = " + query"
o += e.generateQueryBuilder()
}
if e.ResponseStruct == nil {
return o + `return c.requestHandler(c.baseURL+` + e.route() + query + `, "` + e.Method + `", ` + reqObj + `, nil)
}`
}
returnStatementUnhappyPath := e.ResponseStruct.name + "{}"
if e.ResponseStruct.name == "" || e.ResponseStruct.name[0] == '[' {
returnStatementUnhappyPath = "nil"
}
return o + " var v " + e.ResponseStruct.name + `
if err := c.requestHandler(c.baseURL+` + e.route() + query + `, "` + e.Method + `", ` + reqObj + `, &v); err != nil {
return ` + returnStatementUnhappyPath + `, err
}
return v, nil
}`
}
func (e endpointImplementation) generateMethodDefinition() string {
o := ""
if e.Description != "" {
o += e.functionDescription() + "\n"
}
return o + e.generateMethodHeader()
}
func (e endpointImplementation) route() string {
if !strings.Contains(e.Route, "{") {
return `"` + e.Route + `"`
}
o := `"/`
els := strings.Split(e.Route, "/")[1:]
for i, el := range els {
if el[0] != '{' {
o += el
if i < len(els)-1 {
o += "/"
} else {
o += `"`
}
continue
}
for _, p := range e.RequestParametersPath {
if p.k == el[1:len(el)-1] {
prefix := `+"/`
if o[len(o)-1] == '/' {
prefix = ""
}
o += prefix + `"+` + p.routeElement()
if i < len(els)-1 {
o += `+"/`
}
break
}
}
}
return o
}
func (e endpointImplementation) inputArgStr() string {
o := ""
parameters := e.RequestParametersPath
parameters = append(parameters, e.RequestParametersQuery...)
for i, v := range parameters {
o += v.canonicalName() + " " + v.argType(!v.required)
if i < len(parameters)-1 {
o += ", "
}
}
return o
}
func (e endpointImplementation) generateMethodHeader() string {
args := e.inputArgStr()
reqPointer := ""
if e.RequestBodyStruct != nil {
if args != "" {
args += ", "
}
if !e.RequestBodyRequires {
reqPointer = "*"
}
args += "cfg " + reqPointer + e.RequestBodyStruct.name
}
resp := "error"
if e.ResponseStruct != nil {
resp = "(" + e.ResponseStruct.name + ", error)"
}
return e.Name + "(" + args + ") " + resp
}
type mockResponse struct {
Code string
Content string
}
func (e endpointImplementation) generateMockResponse() mockResponse {
o, err := json.Marshal(e.ResponsePositivePathExample)
if err != nil {
panic(err)
}
return mockResponse{
Code: e.ResponsePositivePathStatusCode,
Content: string(o),
}
}
func (e endpointImplementation) generateMethodImplementationTest() string {
if e.ResponseStruct == nil {
return e.generateMethodImplementationTestNoResponseExpected()
}
o := `func Test_client_` + e.Name + `(t *testing.T) {
deserializeResp := func(s string) ` + e.ResponseStruct.name + ` {
var v ` + e.ResponseStruct.name + `
if err := json.Unmarshal([]byte(s), &v); err != nil {
panic(err)
}
return v
}
`
var (
argsInpt, testInpt, fnInputArgs, pointerTypeCfg string
)
inputParameters := e.RequestParametersPath
inputParameters = append(inputParameters, e.RequestParametersQuery...)
if len(inputParameters) > 0 || e.RequestBodyStruct != nil {
argsInpt = "\n\t\targs args"
testInpt = "\n\t\t\targs: args{\n"
o += "\ttype args struct {\n"
for i, v := range inputParameters {
prf := "\t\t" + v.canonicalName()
o += fmt.Sprintf("%s %v\n", prf, v.argType(!v.required))
dummyDate := v.generateDummy()
if !v.required && !v.isArray {
dummyDate = wrapIntoPointerGenFn(dummyDate)
}
testInpt += fmt.Sprintf("\t\t%s: %v,\n", prf, dummyDate)
if i > 0 {
fnInputArgs += ", "
}
fnInputArgs += "tt.args." + v.canonicalName()
}
if e.RequestBodyStruct != nil {
cfgInpt := e.RequestBodyStruct.name + "{}"
if !e.RequestBodyRequires {
pointerTypeCfg = "*"
cfgInpt = "nil"
}
o += "\t\tcfg " + pointerTypeCfg + e.RequestBodyStruct.name + "\n"
testInpt += "\t\t\t\tcfg: " + cfgInpt + ","
if fnInputArgs != "" {
fnInputArgs += ", "
}
fnInputArgs += "tt.args.cfg"
}
testInpt += "\n\t\t\t},"
o += "\t}\n"
}
wantUnhappyPath := e.ResponseStruct.name + "{}"
defer func() {
if r := recover(); r != nil {
log.Fatalf("slice range out of bound: %#v", e.ResponseStruct)
}
}()
if e.ResponseStruct.name == "" || e.ResponseStruct.name[:2] == "[]" {
wantUnhappyPath = "nil"
}
o += ` tests := []struct {
name string` + argsInpt + `
apiKey string
want ` + e.ResponseStruct.name + `
wantErr bool
}{
{
name: "happy path",` + testInpt + `
apiKey: "foo",
want: deserializeResp(endpointResponseExamples["` + e.Route + `"]["` + e.Method + `"].Content),
wantErr: false,
},
{
name: "unhappy path",` + testInpt + `
apiKey: "invalidApiKey",
want: ` + wantUnhappyPath + `,
wantErr: true,
},
}
for _, tt := range tests {
t.Run(
tt.name, func(t *testing.T) {
c, err := NewClient(Config{tt.apiKey, NewMockHTTPClient()})
if err != nil {
panic(err)
}
got, err := c.` + e.Name + "(" + fnInputArgs + `)
if (err != nil) != tt.wantErr {
t.Errorf("` + e.Name + `() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("` + e.Name + `() got = %v, want %v", got, tt.want)
}
},
)
}
}`
return o
}
func (e endpointImplementation) generateMethodImplementationTestNoResponseExpected() string {
o := `func Test_client_` + e.Name + `(t *testing.T) {
`
var (
argsInpt, testInpt, fnInputArgs, pointerTypeCfg string
)
inputParameters := e.RequestParametersPath
inputParameters = append(inputParameters, e.RequestParametersQuery...)
if len(inputParameters) > 0 || e.RequestBodyStruct != nil {
argsInpt = "\n\t\targs args"
testInpt = "\n\t\t\targs: args{\n"
o += "\ttype args struct {\n"
for i, v := range inputParameters {
prf := "\t\t" + v.canonicalName()
o += fmt.Sprintf("%s %v\n", prf, v.argType(!v.required))
dummyDate := v.generateDummy()
if !v.required && !v.isArray {
dummyDate = wrapIntoPointerGenFn(dummyDate)
}
testInpt += fmt.Sprintf("\t\t%s: %v,\n", prf, dummyDate)
if i > 0 {
fnInputArgs += ", "
}
fnInputArgs += "tt.args." + v.canonicalName()
}
if e.RequestBodyStruct != nil {
cfgInpt := e.RequestBodyStruct.name + "{}"
if !e.RequestBodyRequires {
pointerTypeCfg = "*"
cfgInpt = "nil"
}
o += "\t\tcfg " + pointerTypeCfg + e.RequestBodyStruct.name + "\n"
testInpt += "\t\t\t\tcfg: " + cfgInpt + ","
if fnInputArgs != "" {
fnInputArgs += ", "
}
fnInputArgs += "tt.args.cfg"
}
testInpt += "\n\t\t\t},"
o += "\t}\n"
}
o += ` tests := []struct {
name string` + argsInpt + `
apiKey string
wantErr bool
}{
{
name: "happy path",` + testInpt + `
apiKey: "foo",
wantErr: false,
},
{
name: "unhappy path",` + testInpt + `
apiKey: "invalidApiKey",
wantErr: true,
},
}
for _, tt := range tests {
t.Run(
tt.name, func(t *testing.T) {
c, err := NewClient(Config{tt.apiKey, NewMockHTTPClient()})
if err != nil {
panic(err)
}
err = c.` + e.Name + "(" + fnInputArgs + `)
if (err != nil) != tt.wantErr {
t.Errorf("` + e.Name + `() error = %v, wantErr %v", err, tt.wantErr)
return
}
},
)
}
}`
return o
}
// wrapIntoPointerGenFn wraps a dummy value into the generic function
//
// type dummyType interface {
// int | int64 | int32 | bool | string | float64 | float32
// }
//
// func createPointer[V dummyType](v V) *V {
// return &v
// }
func wrapIntoPointerGenFn(v interface{}) string {
return fmt.Sprintf("createPointer(%v)", v)
}
// generateQueryBuilder generates the function to define the request's query
func (e endpointImplementation) generateQueryBuilder() string {
if len(e.RequestParametersQuery) == 0 {
return ""
}
o := "\tvar (\n"
o += "\t\tqueryElements []string\n"
o += "\t\tquery string\n"
o += "\t)\n"
for _, p := range filterRequiredParameters(e.RequestParametersQuery) {
queryElement := `"` + p.name() + "=\"+" + p.routeElement()
o += "\tqueryElements = append(queryElements, " + queryElement + ")\n"
}
for _, p := range filterOptionalParameters(e.RequestParametersQuery) {
var (
ifStatement string
queryElement string
tmpArrayDef string
)
switch p.isArray {
case false:
optionalCondition := p.canonicalName() + " != nil "
ifStatement = "\tif " + optionalCondition + "{\n"
queryElement = `"` + p.name() + "=\"+" + p.routeElement(true)
case true:
optionalCondition := "len(" + p.canonicalName() + ") > 0 "
ifStatement = "\tif " + optionalCondition + "{\n"
switch p.v {
case "string":
queryElement = `"` + p.name() + "=\"+strings.Join(" + p.canonicalName() + `, ",")`
default:
tmpArrName := p.canonicalName() + "Tmp"
tmpArrayDef = "\t\tvar " + tmpArrName + " = make([]string, len(" + p.canonicalName() + "))\n"
tmpArrayDef += "\t\tfor i, el := range " + p.canonicalName() + " {\n"
tmpArrayDef += "\t\t\t" + tmpArrName + "[i] = fmt.Sprintf(\"%v\", el)\n"
tmpArrayDef += "\t\t}\n"
queryElement = `"` + p.name() + "=\"+strings.Join(" + tmpArrName + `, ",")`
}
}
o += ifStatement + tmpArrayDef + "\t\tqueryElements = append(queryElements, " + queryElement + ")\n"
o += "\t}\n"
}
o += "\tif len(queryElements) > 0 {\n"
o += "\t\tquery = \"?\" + strings.Join(queryElements, \"&\")\n"
o += "\t}\n"
return o
}
func filterRequiredParameters(v []field) []field {
var o []field
for _, p := range v {
if p.required {
o = append(o, p)
}
}
return o
}
func filterOptionalParameters(v []field) []field {
var o []field
for _, p := range v {
if !p.required {
o = append(o, p)