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client.go
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client.go
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package seb
import (
"bytes"
"errors"
"fmt"
"io"
"mime"
"mime/multipart"
"net/http"
"net/url"
"time"
"github.com/micvbang/simple-event-broker/internal/infrastructure/httphelpers"
)
var (
ErrNotAuthorized = errors.New("not authorized")
ErrNotFound = errors.New("not found")
)
type RecordClient struct {
client *http.Client
baseURL *url.URL
apiKey string
}
// NewRecordClient initializes and returns a *RecordClient.
func NewRecordClient(baseURL string, apiKey string) (*RecordClient, error) {
bURL, err := url.Parse(baseURL)
if err != nil {
return nil, fmt.Errorf("parsing base url: %w", err)
}
return &RecordClient{
client: &http.Client{
Transport: &http.Transport{
MaxIdleConnsPerHost: 10,
IdleConnTimeout: time.Second,
},
},
baseURL: bURL,
apiKey: apiKey,
}, nil
}
func (c *RecordClient) AddRecords(topicName string, recordSizes []uint32, recordsData []byte) error {
buf := bytes.NewBuffer(make([]byte, 0, len(recordsData)+4096))
contentType, err := httphelpers.RecordsToMultipartFormData(buf, recordSizes, recordsData)
if err != nil {
return err
}
req, err := c.request("POST", "/records", buf)
if err != nil {
return fmt.Errorf("creating request: %w", err)
}
req.Header.Add("Content-Type", contentType)
httphelpers.AddQueryParams(req, map[string]string{"topic-name": topicName})
res, err := c.client.Do(req)
if err != nil {
return fmt.Errorf("sending request: %w", err)
}
defer res.Body.Close()
io.Copy(io.Discard, res.Body)
err = c.statusCode(res)
if err != nil {
return err
}
return nil
}
func (c *RecordClient) GetRecord(topicName string, offset uint64) ([]byte, error) {
req, err := c.request("GET", "/record", nil)
if err != nil {
return nil, fmt.Errorf("creating request: %w", err)
}
httphelpers.AddQueryParams(req, map[string]string{
"topic-name": topicName,
"offset": fmt.Sprintf("%d", offset),
})
res, err := c.client.Do(req)
if err != nil {
return nil, fmt.Errorf("sending request: %w", err)
}
defer res.Body.Close()
err = c.statusCode(res)
if err != nil {
return nil, err
}
buf, err := io.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("reading body: %w", err)
}
return buf, nil
}
type GetRecordsInput struct {
// MaxRecords is the maximum number of records to return. Defaults to 10
MaxRecords int
// SoftMaxBytes is the maximum number of bytes to return. If the first
// record is larger than SoftMaxBytes, that record is returned anyway.
// Defaults to infinity.
SoftMaxBytes int
// Timeout is the amount of time to allow the server (on the server side) to
// collect records for. If this timeout is exceeded, the number of records
// collected so far will be returned. Defaults to 10s.
Timeout time.Duration
}
const multipartFormData = "multipart/form-data"
func (c *RecordClient) GetRecords(topicName string, offset uint64, input GetRecordsInput) ([][]byte, error) {
if input.MaxRecords == 0 {
input.MaxRecords = 10
}
req, err := c.request("GET", "/records", nil)
if err != nil {
return nil, fmt.Errorf("creating request: %w", err)
}
req.Header.Add("Accept", "multipart/form-data")
httphelpers.AddQueryParams(req, map[string]string{
"topic-name": topicName,
"offset": fmt.Sprintf("%d", offset),
"max-records": fmt.Sprintf("%d", input.MaxRecords),
"max-bytes": fmt.Sprintf("%d", input.SoftMaxBytes),
})
if input.Timeout != 0 {
httphelpers.AddQueryParams(req, map[string]string{
"timeout": input.Timeout.String(),
})
}
res, err := c.client.Do(req)
if err != nil {
return nil, fmt.Errorf("sending request: %w", err)
}
defer res.Body.Close()
err = c.statusCode(res)
if err != nil {
return nil, err
}
mediaType, params, err := mime.ParseMediaType(res.Header.Get("Content-Type"))
if err != nil {
return nil, fmt.Errorf("parsing media type: %w", err)
}
if mediaType != multipartFormData {
return nil, fmt.Errorf("expected mediatype '%s', got '%s'", multipartFormData, mediaType)
}
mr := multipart.NewReader(res.Body, params["boundary"])
records := make([][]byte, 0, input.MaxRecords)
for part, err := mr.NextPart(); err == nil; part, err = mr.NextPart() {
record, err := io.ReadAll(part)
if err != nil {
return records, err
}
records = append(records, record)
}
return records, nil
}
// CloseIdleConnections closes unused, idle connections on the underlying
// http.Client.
func (c *RecordClient) CloseIdleConnections() {
c.client.CloseIdleConnections()
}
func (c *RecordClient) statusCode(res *http.Response) error {
if res.StatusCode == http.StatusUnauthorized {
return fmt.Errorf("status code %d: %w", res.StatusCode, ErrNotAuthorized)
}
if res.StatusCode == http.StatusNotFound {
return fmt.Errorf("status code %d: %w", res.StatusCode, ErrNotFound)
}
if res.StatusCode == http.StatusRequestEntityTooLarge {
return fmt.Errorf("status code %d: %w", res.StatusCode, ErrPayloadTooLarge)
}
return nil
}
func (c *RecordClient) request(method string, path string, body io.Reader) (*http.Request, error) {
url := c.baseURL.JoinPath(path)
req, err := http.NewRequest(method, url.String(), body)
if err != nil {
return nil, fmt.Errorf("creating request: %w", err)
}
req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", c.apiKey))
return req, nil
}