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package document
import (
"bytes"
"encoding/json"
"fmt"
"io"
"math"
"net/http"
"net/url"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/vespa-engine/vespa/client/go/internal/util"
)
// Client represents a HTTP client for the /document/v1/ API.
type Client struct {
options ClientOptions
httpClients []countingHTTPClient
now func() time.Time
sendCount int32
}
// ClientOptions specifices the configuration options of a feed client.
type ClientOptions struct {
BaseURL string
Timeout time.Duration
Route string
TraceLevel *int
}
type countingHTTPClient struct {
client util.HTTPClient
inflight int64
}
func (c *countingHTTPClient) addInflight(n int64) { atomic.AddInt64(&c.inflight, n) }
func (c *countingHTTPClient) Do(req *http.Request, timeout time.Duration) (*http.Response, error) {
defer c.addInflight(-1)
return c.client.Do(req, timeout)
}
type countingReader struct {
reader io.Reader
bytesRead int64
}
func (r *countingReader) Read(p []byte) (int, error) {
n, err := r.reader.Read(p)
r.bytesRead += int64(n)
return n, err
}
func NewClient(options ClientOptions, httpClients []util.HTTPClient) *Client {
if len(httpClients) < 1 {
panic("need at least one HTTP client")
}
countingClients := make([]countingHTTPClient, 0, len(httpClients))
for _, client := range httpClients {
countingClients = append(countingClients, countingHTTPClient{client: client})
}
return &Client{
options: options,
httpClients: countingClients,
now: time.Now,
}
}
func (c *Client) queryParams() url.Values {
params := url.Values{}
if c.options.Timeout > 0 {
params.Set("timeout", strconv.FormatInt(c.options.Timeout.Milliseconds(), 10)+"ms")
}
if c.options.Route != "" {
params.Set("route", c.options.Route)
}
if c.options.TraceLevel != nil {
params.Set("tracelevel", strconv.Itoa(*c.options.TraceLevel))
}
return params
}
func urlPath(id Id) string {
var sb strings.Builder
sb.WriteString("/document/v1/")
sb.WriteString(url.PathEscape(id.Namespace))
sb.WriteString("/")
sb.WriteString(url.PathEscape(id.Type))
if id.Number != nil {
sb.WriteString("/number/")
n := uint64(*id.Number)
sb.WriteString(strconv.FormatUint(n, 10))
} else if id.Group != "" {
sb.WriteString("/group/")
sb.WriteString(url.PathEscape(id.Group))
} else {
sb.WriteString("/docid")
}
sb.WriteString("/")
sb.WriteString(url.PathEscape(id.UserSpecific))
return sb.String()
}
func (c *Client) feedURL(d Document, queryParams url.Values) (string, *url.URL, error) {
u, err := url.Parse(c.options.BaseURL)
if err != nil {
return "", nil, fmt.Errorf("invalid base url: %w", err)
}
httpMethod := ""
switch d.Operation {
case OperationPut:
httpMethod = "POST"
case OperationUpdate:
httpMethod = "PUT"
case OperationRemove:
httpMethod = "DELETE"
}
if d.Condition != "" {
queryParams.Set("condition", d.Condition)
}
if d.Create {
queryParams.Set("create", "true")
}
u.Path = urlPath(d.Id)
u.RawQuery = queryParams.Encode()
return httpMethod, u, nil
}
func (c *Client) leastBusyClient() *countingHTTPClient {
leastBusy := c.httpClients[0]
min := int64(math.MaxInt64)
next := atomic.AddInt32(&c.sendCount, 1)
start := int(next) % len(c.httpClients)
for i := range c.httpClients {
j := (i + start) % len(c.httpClients)
client := c.httpClients[j]
inflight := atomic.LoadInt64(&client.inflight)
if inflight < min {
leastBusy = client
min = inflight
}
}
leastBusy.addInflight(1)
return &leastBusy
}
// Send given document to the endpoint configured in this client.
func (c *Client) Send(document Document) Result {
start := c.now()
result := Result{Id: document.Id, Stats: Stats{Requests: 1}}
method, url, err := c.feedURL(document, c.queryParams())
if err != nil {
return resultWithErr(result, err)
}
req, err := http.NewRequest(method, url.String(), bytes.NewReader(document.Body))
if err != nil {
return resultWithErr(result, err)
}
resp, err := c.leastBusyClient().Do(req, 190*time.Second)
if err != nil {
return resultWithErr(result, err)
}
defer resp.Body.Close()
elapsed := c.now().Sub(start)
return c.resultWithResponse(resp, result, document, elapsed)
}
func resultWithErr(result Result, err error) Result {
result.Stats.Errors++
result.Status = StatusTransportFailure
result.Err = err
return result
}
func (c *Client) resultWithResponse(resp *http.Response, result Result, document Document, elapsed time.Duration) Result {
result.HTTPStatus = resp.StatusCode
result.Stats.Responses++
result.Stats.ResponsesByCode = map[int]int64{resp.StatusCode: 1}
switch resp.StatusCode {
case 200:
result.Status = StatusSuccess
case 412:
result.Status = StatusConditionNotMet
case 502, 504, 507:
result.Status = StatusVespaFailure
default:
result.Status = StatusTransportFailure
}
var body struct {
Message string `json:"message"`
Trace json.RawMessage `json:"trace"`
}
cr := countingReader{reader: resp.Body}
jsonDec := json.NewDecoder(&cr)
if err := jsonDec.Decode(&body); err != nil {
result.Status = StatusVespaFailure
result.Err = fmt.Errorf("failed to decode json response: %w", err)
}
result.Message = body.Message
result.Trace = string(body.Trace)
result.Stats.BytesSent = int64(len(document.Body))
result.Stats.BytesRecv = cr.bytesRead
if !result.Success() {
result.Stats.Errors++
}
result.Stats.TotalLatency = elapsed
result.Stats.MinLatency = elapsed
result.Stats.MaxLatency = elapsed
return result
}
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