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fasthttp.go
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fasthttp.go
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package httpclient
import (
"context"
"github.com/b2wdigital/restQL-golang/v4/internal/domain"
"github.com/b2wdigital/restQL-golang/v4/internal/platform/conf"
"github.com/b2wdigital/restQL-golang/v4/internal/platform/plugins"
"github.com/b2wdigital/restQL-golang/v4/pkg/restql"
"github.com/pkg/errors"
"github.com/rs/dnscache"
"github.com/valyala/fasthttp"
"net"
"sync"
"time"
)
var errInvalidJSON = errors.New("invalid json")
type httpResult struct {
target string
duration time.Duration
err error
response *fasthttp.Response
}
type fastHTTPClient struct {
client *fasthttp.Client
log restql.Logger
lifecycle plugins.Lifecycle
responsePool *sync.Pool
}
func newFastHTTPClient(log restql.Logger, pm plugins.Lifecycle, cfg *conf.Config) *fastHTTPClient {
clientCfg := cfg.HTTP.Client
r := &dnscache.Resolver{}
go func() {
t := time.NewTicker(clientCfg.DnsRefreshInterval)
defer t.Stop()
for range t.C {
r.Refresh(true)
}
}()
dialer := &fasthttp.TCPDialer{
Resolver: &net.Resolver{
PreferGo: true,
StrictErrors: false,
Dial: func(ctx context.Context, network, address string) (conn net.Conn, err error) {
host, port, err := net.SplitHostPort(address)
if err != nil {
return nil, err
}
ips, err := r.LookupHost(ctx, host)
if err != nil {
return nil, err
}
for _, ip := range ips {
var dialer net.Dialer
conn, err = dialer.Dial(network, net.JoinHostPort(ip, port))
if err == nil {
break
}
}
return
},
},
}
rp := &sync.Pool{
New: func() interface{} {
return make(chan httpResult)
},
}
c := &fasthttp.Client{
Name: "restql",
NoDefaultUserAgentHeader: false,
DisableHeaderNamesNormalizing: true,
Dial: dialer.Dial,
MaxConnsPerHost: clientCfg.MaxConnsPerHost,
MaxIdleConnDuration: clientCfg.MaxIdleConnDuration,
MaxConnWaitTimeout: clientCfg.ConnTimeout,
}
return &fastHTTPClient{client: c, log: log, lifecycle: pm, responsePool: rp}
}
func (hc *fastHTTPClient) Do(ctx context.Context, request restql.HTTPRequest) (restql.HTTPResponse, error) {
requestCtx := hc.lifecycle.BeforeRequest(ctx, request)
c := hc.responsePool.Get().(chan httpResult)
go func() {
req := fasthttp.AcquireRequest()
err := setupRequest(request, req)
if err != nil {
hc.log.Error("failed to setup http client request", err)
fasthttp.ReleaseRequest(req)
c <- httpResult{target: request.Host, err: err, duration: 0}
return
}
res := fasthttp.AcquireResponse()
start := time.Now()
err = hc.client.DoTimeout(req, res, request.Timeout)
finish := time.Since(start)
reqUri := req.URI().String()
fasthttp.ReleaseRequest(req)
c <- httpResult{target: reqUri, err: err, duration: finish, response: res}
}()
hr := <-c
hc.responsePool.Put(c)
switch {
case hr.err == fasthttp.ErrTimeout || hr.err == fasthttp.ErrDialTimeout || hr.err == fasthttp.ErrTLSHandshakeTimeout:
hc.log.Info("request timed out", "url", hr.target, "method", request.Method, "duration-ms", hr.duration.Milliseconds())
response := makeErrorResponse(hr.target, hr.duration, fasthttp.StatusRequestTimeout)
fasthttp.ReleaseResponse(hr.response)
hc.lifecycle.AfterRequest(requestCtx, request, response, hr.err)
return response, domain.ErrRequestTimeout
case hr.err != nil:
response := makeErrorResponse(hr.target, hr.duration, hr.response.StatusCode())
if hr.response != nil {
fasthttp.ReleaseResponse(hr.response)
}
hc.lifecycle.AfterRequest(requestCtx, request, response, hr.err)
return response, errors.Wrap(hr.err, "request execution failed")
}
body, err := unmarshalBody(hc.log, hr.response)
if err != nil {
hc.log.Error("invalid json as body", err, "url", hr.target, "body", body.Unmarshal(), "statusCode", hr.response.StatusCode())
}
response := restql.HTTPResponse{
URL: hr.target,
StatusCode: hr.response.StatusCode(),
Headers: readHeaders(hr.response),
Duration: hr.duration,
Body: body,
}
fasthttp.ReleaseResponse(hr.response)
hc.lifecycle.AfterRequest(requestCtx, request, response, hr.err)
return response, nil
}