/
client.go
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/
client.go
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package anthropic
import (
"bufio"
"context"
"encoding/json"
"fmt"
utils "github.com/anhao/go-anthropic/internal"
"io"
"net/http"
)
type Client struct {
config ClientConfig
requestBuilder utils.RequestBuilder
createFormBuilder func(io.Writer) utils.FormBuilder
}
func NewClient(authToken string) *Client {
config := DefaultConfig(authToken)
return NewClientWithConfig(config)
}
func NewClientWithConfig(config ClientConfig) *Client {
return &Client{
config: config,
requestBuilder: utils.NewRequestBuilder(),
createFormBuilder: func(body io.Writer) utils.FormBuilder {
return utils.NewFormBuilder(body)
},
}
}
type requestOptions struct {
body any
header http.Header
}
type requestOption func(*requestOptions)
func withBody(body any) requestOption {
return func(args *requestOptions) {
args.body = body
}
}
func withContentType(contentType string) requestOption {
return func(args *requestOptions) {
args.header.Set("Content-Type", contentType)
}
}
func (c *Client) newRequest(ctx context.Context, method, url string, setters ...requestOption) (*http.Request, error) {
// Default Options
args := &requestOptions{
body: nil,
header: make(http.Header),
}
for _, setter := range setters {
setter(args)
}
req, err := c.requestBuilder.Build(ctx, method, url, args.body, args.header)
if err != nil {
return nil, err
}
c.setCommonHeaders(req)
return req, nil
}
func (c *Client) sendRequest(req *http.Request, v any) error {
req.Header.Set("Accept", "application/json; charset=utf-8")
contentType := req.Header.Get("Content-Type")
if contentType == "" {
req.Header.Set("Content-Type", "application/json; charset=utf-8")
}
res, err := c.config.HTTPClient.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
if isFailureStatusCode(res) {
return c.handleErrorResp(res)
}
return decodeResponse(res.Body, v)
}
func (c *Client) sendRequestRaw(req *http.Request) (body io.ReadCloser, err error) {
resp, err := c.config.HTTPClient.Do(req)
if err != nil {
return
}
if isFailureStatusCode(resp) {
err = c.handleErrorResp(resp)
return
}
return resp.Body, nil
}
func sendRequestStream[T streamable](client *Client, req *http.Request) (*streamReader[T], error) {
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Accept", "text/event-stream")
req.Header.Set("Cache-Control", "no-cache")
req.Header.Set("Connection", "keep-alive")
resp, err := client.config.HTTPClient.Do(req)
if err != nil {
return new(streamReader[T]), err
}
if isFailureStatusCode(resp) {
return new(streamReader[T]), client.handleErrorResp(resp)
}
return &streamReader[T]{
emptyMessagesLimit: client.config.EmptyMessagesLimit,
reader: bufio.NewReader(resp.Body),
response: resp,
errAccumulator: utils.NewErrorAccumulator(),
unmarshaler: &utils.JSONUnmarshaler{},
}, nil
}
func (c *Client) setCommonHeaders(req *http.Request) {
req.Header.Set("x-api-key", c.config.ApiKey)
req.Header.Set("anthropic-version", c.config.Version)
}
func isFailureStatusCode(resp *http.Response) bool {
return resp.StatusCode < http.StatusOK || resp.StatusCode >= http.StatusBadRequest
}
func decodeResponse(body io.Reader, v any) error {
if v == nil {
return nil
}
if result, ok := v.(*string); ok {
return decodeString(body, result)
}
return json.NewDecoder(body).Decode(v)
}
func decodeString(body io.Reader, output *string) error {
b, err := io.ReadAll(body)
if err != nil {
return err
}
*output = string(b)
return nil
}
func (c *Client) fullURL(suffix string, args ...any) string {
return fmt.Sprintf("%s%s", c.config.BaseURL, suffix)
}
func (c *Client) handleErrorResp(resp *http.Response) error {
var errRes ErrorResponse
err := json.NewDecoder(resp.Body).Decode(&errRes)
if err != nil || errRes.Error == nil {
reqErr := &RequestError{
HTTPStatusCode: resp.StatusCode,
Err: err,
}
if errRes.Error != nil {
reqErr.Err = errRes.Error
}
return reqErr
}
errRes.Error.HTTPStatusCode = resp.StatusCode
return errRes.Error
}