Move form_builder into internal pkg. (#311)

* Move form_uilder into internal pkg.

* Fix import of audio.go

* Reorganize.

* Fix import.

* Fix

---------

Co-authored-by: JoyShi <joy.shi@sap.com>

audio.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+
+	utils "github.com/sashabaranov/go-openai/internal"
 )
 
 // Whisper Defines the models provided by OpenAI to use when processing audio with OpenAI.
@@ -72,7 +74,7 @@ func (c *Client) callAudioAPI(
 	if err != nil {
 		return AudioResponse{}, err
 	}
-	req.Header.Add("Content-Type", builder.formDataContentType())
+	req.Header.Add("Content-Type", builder.FormDataContentType())
 
 	if request.HasJSONResponse() {
 		err = c.sendRequest(req, &response)
@@ -92,26 +94,26 @@ func (r AudioRequest) HasJSONResponse() bool {
 
 // audioMultipartForm creates a form with audio file contents and the name of the model to use for
 // audio processing.
-func audioMultipartForm(request AudioRequest, b formBuilder) error {
+func audioMultipartForm(request AudioRequest, b utils.FormBuilder) error {
 	f, err := os.Open(request.FilePath)
 	if err != nil {
 		return fmt.Errorf("opening audio file: %w", err)
 	}
 	defer f.Close()
 
-	err = b.createFormFile("file", f)
+	err = b.CreateFormFile("file", f)
 	if err != nil {
 		return fmt.Errorf("creating form file: %w", err)
 	}
 
-	err = b.writeField("model", request.Model)
+	err = b.WriteField("model", request.Model)
 	if err != nil {
 		return fmt.Errorf("writing model name: %w", err)
 	}
 
 	// Create a form field for the prompt (if provided)
 	if request.Prompt != "" {
-		err = b.writeField("prompt", request.Prompt)
+		err = b.WriteField("prompt", request.Prompt)
 		if err != nil {
 			return fmt.Errorf("writing prompt: %w", err)
 		}
@@ -119,7 +121,7 @@ func audioMultipartForm(request AudioRequest, b formBuilder) error {
 
 	// Create a form field for the format (if provided)
 	if request.Format != "" {
-		err = b.writeField("response_format", string(request.Format))
+		err = b.WriteField("response_format", string(request.Format))
 		if err != nil {
 			return fmt.Errorf("writing format: %w", err)
 		}
@@ -127,7 +129,7 @@ func audioMultipartForm(request AudioRequest, b formBuilder) error {
 
 	// Create a form field for the temperature (if provided)
 	if request.Temperature != 0 {
-		err = b.writeField("temperature", fmt.Sprintf("%.2f", request.Temperature))
+		err = b.WriteField("temperature", fmt.Sprintf("%.2f", request.Temperature))
 		if err != nil {
 			return fmt.Errorf("writing temperature: %w", err)
 		}
@@ -135,12 +137,12 @@ func audioMultipartForm(request AudioRequest, b formBuilder) error {
 
 	// Create a form field for the language (if provided)
 	if request.Language != "" {
-		err = b.writeField("language", request.Language)
+		err = b.WriteField("language", request.Language)
 		if err != nil {
 			return fmt.Errorf("writing language: %w", err)
 		}
 	}
 
 	// Close the multipart writer
-	return b.close()
+	return b.Close()
 }

client.go

@@ -7,6 +7,8 @@ import (
 	"io"
 	"net/http"
 	"strings"
+
+	utils "github.com/sashabaranov/go-openai/internal"
 )
 
 // Client is OpenAI GPT-3 API client.
@@ -14,7 +16,7 @@ type Client struct {
 	config ClientConfig
 
 	requestBuilder    requestBuilder
-	createFormBuilder func(io.Writer) formBuilder
+	createFormBuilder func(io.Writer) utils.FormBuilder
 }
 
 // NewClient creates new OpenAI API client.
@@ -28,8 +30,8 @@ func NewClientWithConfig(config ClientConfig) *Client {
 	return &Client{
 		config:         config,
 		requestBuilder: newRequestBuilder(),
-		createFormBuilder: func(body io.Writer) formBuilder {
+		createFormBuilder: func(body io.Writer) utils.FormBuilder {
-			return newFormBuilder(body)
+			return utils.NewFormBuilder(body)
 		},
 	}
 }

files.go

@@ -36,7 +36,7 @@ func (c *Client) CreateFile(ctx context.Context, request FileRequest) (file File
 	var b bytes.Buffer
 	builder := c.createFormBuilder(&b)
 
-	err = builder.writeField("purpose", request.Purpose)
+	err = builder.WriteField("purpose", request.Purpose)
 	if err != nil {
 		return
 	}
@@ -46,12 +46,12 @@ func (c *Client) CreateFile(ctx context.Context, request FileRequest) (file File
 		return
 	}
 
-	err = builder.createFormFile("file", fileData)
+	err = builder.CreateFormFile("file", fileData)
 	if err != nil {
 		return
 	}
 
-	err = builder.close()
+	err = builder.Close()
 	if err != nil {
 		return
 	}
@@ -61,7 +61,7 @@ func (c *Client) CreateFile(ctx context.Context, request FileRequest) (file File
 		return
 	}
 
-	req.Header.Set("Content-Type", builder.formDataContentType())
+	req.Header.Set("Content-Type", builder.FormDataContentType())
 
 	err = c.sendRequest(req, &file)
 

files_test.go

@@ -1,6 +1,7 @@
 package openai //nolint:testpackage // testing private field
 
 import (
+	. "github.com/sashabaranov/go-openai/internal"
 	"github.com/sashabaranov/go-openai/internal/test"
 	"github.com/sashabaranov/go-openai/internal/test/checks"
 
@@ -85,7 +86,7 @@ func TestFileUploadWithFailingFormBuilder(t *testing.T) {
 	config.BaseURL = ""
 	client := NewClientWithConfig(config)
 	mockBuilder := &mockFormBuilder{}
-	client.createFormBuilder = func(io.Writer) formBuilder {
+	client.createFormBuilder = func(io.Writer) FormBuilder {
 		return mockBuilder
 	}
 

form_builder.go

@@ -1,49 +0,0 @@
-package openai
-
-import (
-	"io"
-	"mime/multipart"
-	"os"
-)
-
-type formBuilder interface {
-	createFormFile(fieldname string, file *os.File) error
-	writeField(fieldname, value string) error
-	close() error
-	formDataContentType() string
-}
-
-type defaultFormBuilder struct {
-	writer *multipart.Writer
-}
-
-func newFormBuilder(body io.Writer) *defaultFormBuilder {
-	return &defaultFormBuilder{
-		writer: multipart.NewWriter(body),
-	}
-}
-
-func (fb *defaultFormBuilder) createFormFile(fieldname string, file *os.File) error {
-	fieldWriter, err := fb.writer.CreateFormFile(fieldname, file.Name())
-	if err != nil {
-		return err
-	}
-
-	_, err = io.Copy(fieldWriter, file)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
-func (fb *defaultFormBuilder) writeField(fieldname, value string) error {
-	return fb.writer.WriteField(fieldname, value)
-}
-
-func (fb *defaultFormBuilder) close() error {
-	return fb.writer.Close()
-}
-
-func (fb *defaultFormBuilder) formDataContentType() string {
-	return fb.writer.FormDataContentType()
-}

image.go

@@ -69,40 +69,40 @@ func (c *Client) CreateEditImage(ctx context.Context, request ImageEditRequest)
 	builder := c.createFormBuilder(body)
 
 	// image
-	err = builder.createFormFile("image", request.Image)
+	err = builder.CreateFormFile("image", request.Image)
 	if err != nil {
 		return
 	}
 
 	// mask, it is optional
 	if request.Mask != nil {
-		err = builder.createFormFile("mask", request.Mask)
+		err = builder.CreateFormFile("mask", request.Mask)
 		if err != nil {
 			return
 		}
 	}
 
-	err = builder.writeField("prompt", request.Prompt)
+	err = builder.WriteField("prompt", request.Prompt)
 	if err != nil {
 		return
 	}
 
-	err = builder.writeField("n", strconv.Itoa(request.N))
+	err = builder.WriteField("n", strconv.Itoa(request.N))
 	if err != nil {
 		return
 	}
 
-	err = builder.writeField("size", request.Size)
+	err = builder.WriteField("size", request.Size)
 	if err != nil {
 		return
 	}
 
-	err = builder.writeField("response_format", request.ResponseFormat)
+	err = builder.WriteField("response_format", request.ResponseFormat)
 	if err != nil {
 		return
 	}
 
-	err = builder.close()
+	err = builder.Close()
 	if err != nil {
 		return
 	}
@@ -113,7 +113,7 @@ func (c *Client) CreateEditImage(ctx context.Context, request ImageEditRequest)
 		return
 	}
 
-	req.Header.Set("Content-Type", builder.formDataContentType())
+	req.Header.Set("Content-Type", builder.FormDataContentType())
 	err = c.sendRequest(req, &response)
 	return
 }
@@ -133,27 +133,27 @@ func (c *Client) CreateVariImage(ctx context.Context, request ImageVariRequest)
 	builder := c.createFormBuilder(body)
 
 	// image
-	err = builder.createFormFile("image", request.Image)
+	err = builder.CreateFormFile("image", request.Image)
 	if err != nil {
 		return
 	}
 
-	err = builder.writeField("n", strconv.Itoa(request.N))
+	err = builder.WriteField("n", strconv.Itoa(request.N))
 	if err != nil {
 		return
 	}
 
-	err = builder.writeField("size", request.Size)
+	err = builder.WriteField("size", request.Size)
 	if err != nil {
 		return
 	}
 
-	err = builder.writeField("response_format", request.ResponseFormat)
+	err = builder.WriteField("response_format", request.ResponseFormat)
 	if err != nil {
 		return
 	}
 
-	err = builder.close()
+	err = builder.Close()
 	if err != nil {
 		return
 	}
@@ -165,7 +165,7 @@ func (c *Client) CreateVariImage(ctx context.Context, request ImageVariRequest)
 		return
 	}
 
-	req.Header.Set("Content-Type", builder.formDataContentType())
+	req.Header.Set("Content-Type", builder.FormDataContentType())
 	err = c.sendRequest(req, &response)
 	return
 }

image_test.go

@@ -1,6 +1,7 @@
 package openai //nolint:testpackage // testing private field
 
 import (
+	utils "github.com/sashabaranov/go-openai/internal"
 	"github.com/sashabaranov/go-openai/internal/test"
 	"github.com/sashabaranov/go-openai/internal/test/checks"
 
@@ -268,19 +269,19 @@ type mockFormBuilder struct {
 	mockClose          func() error
 }
 
-func (fb *mockFormBuilder) createFormFile(fieldname string, file *os.File) error {
+func (fb *mockFormBuilder) CreateFormFile(fieldname string, file *os.File) error {
 	return fb.mockCreateFormFile(fieldname, file)
 }
 
-func (fb *mockFormBuilder) writeField(fieldname, value string) error {
+func (fb *mockFormBuilder) WriteField(fieldname, value string) error {
 	return fb.mockWriteField(fieldname, value)
 }
 
-func (fb *mockFormBuilder) close() error {
+func (fb *mockFormBuilder) Close() error {
 	return fb.mockClose()
 }
 
-func (fb *mockFormBuilder) formDataContentType() string {
+func (fb *mockFormBuilder) FormDataContentType() string {
 	return ""
 }
 
@@ -290,7 +291,7 @@ func TestImageFormBuilderFailures(t *testing.T) {
 	client := NewClientWithConfig(config)
 
 	mockBuilder := &mockFormBuilder{}
-	client.createFormBuilder = func(io.Writer) formBuilder {
+	client.createFormBuilder = func(io.Writer) utils.FormBuilder {
 		return mockBuilder
 	}
 	ctx := context.Background()
@@ -357,7 +358,7 @@ func TestVariImageFormBuilderFailures(t *testing.T) {
 	client := NewClientWithConfig(config)
 
 	mockBuilder := &mockFormBuilder{}
-	client.createFormBuilder = func(io.Writer) formBuilder {
+	client.createFormBuilder = func(io.Writer) utils.FormBuilder {
 		return mockBuilder
 	}
 	ctx := context.Background()

internal/form_builder.go

@@ -0,0 +1,49 @@
+package openai
+
+import (
+	"io"
+	"mime/multipart"
+	"os"
+)
+
+type FormBuilder interface {
+	CreateFormFile(fieldname string, file *os.File) error
+	WriteField(fieldname, value string) error
+	Close() error
+	FormDataContentType() string
+}
+
+type DefaultFormBuilder struct {
+	writer *multipart.Writer
+}
+
+func NewFormBuilder(body io.Writer) *DefaultFormBuilder {
+	return &DefaultFormBuilder{
+		writer: multipart.NewWriter(body),
+	}
+}
+
+func (fb *DefaultFormBuilder) CreateFormFile(fieldname string, file *os.File) error {
+	fieldWriter, err := fb.writer.CreateFormFile(fieldname, file.Name())
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(fieldWriter, file)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (fb *DefaultFormBuilder) WriteField(fieldname, value string) error {
+	return fb.writer.WriteField(fieldname, value)
+}
+
+func (fb *DefaultFormBuilder) Close() error {
+	return fb.writer.Close()
+}
+
+func (fb *DefaultFormBuilder) FormDataContentType() string {
+	return fb.writer.FormDataContentType()
+}

internal/form_builder_test.go

@@ -30,8 +30,8 @@ func TestFormBuilderWithFailingWriter(t *testing.T) {
 	defer file.Close()
 	defer os.Remove(file.Name())
 
-	builder := newFormBuilder(&failingWriter{})
+	builder := NewFormBuilder(&failingWriter{})
-	err = builder.createFormFile("file", file)
+	err = builder.CreateFormFile("file", file)
 	checks.ErrorIs(t, err, errMockFailingWriterError, "formbuilder should return error if writer fails")
 }
 
@@ -47,8 +47,8 @@ func TestFormBuilderWithClosedFile(t *testing.T) {
 	defer os.Remove(file.Name())
 
 	body := &bytes.Buffer{}
-	builder := newFormBuilder(body)
+	builder := NewFormBuilder(body)
-	err = builder.createFormFile("file", file)
+	err = builder.CreateFormFile("file", file)
 	checks.HasError(t, err, "formbuilder should return error if file is closed")
 	checks.ErrorIs(t, err, os.ErrClosed, "formbuilder should return error if file is closed")
 }