forked from openware/pkg
/
request.go
303 lines (261 loc) · 7.15 KB
/
request.go
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package request
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httputil"
"net/url"
"sync/atomic"
"time"
"github.com/ianeinser/pkg/common/timedmutex"
"github.com/ianeinser/pkg/log"
"github.com/ianeinser/pkg/mock"
"github.com/ianeinser/pkg/nonce"
)
// New returns a new Requester
func New(name string, httpRequester *http.Client, opts ...RequesterOption) *Requester {
r := &Requester{
HTTPClient: httpRequester,
Name: name,
backoff: DefaultBackoff(),
retryPolicy: DefaultRetryPolicy,
maxRetries: MaxRetryAttempts,
timedLock: timedmutex.NewTimedMutex(DefaultMutexLockTimeout),
}
for _, o := range opts {
o(r)
}
return r
}
// SendPayload handles sending HTTP/HTTPS requests
func (r *Requester) SendPayload(ctx context.Context, i *Item) error {
if !i.NonceEnabled {
r.timedLock.LockForDuration()
}
req, err := i.validateRequest(ctx, r)
if err != nil {
r.timedLock.UnlockIfLocked()
return err
}
if i.HTTPDebugging {
// Err not evaluated due to validation check above
dump, _ := httputil.DumpRequestOut(req, true)
log.Debugf(log.RequestSys, "DumpRequest:\n%s", dump)
}
if atomic.LoadInt32(&r.jobs) >= MaxRequestJobs {
r.timedLock.UnlockIfLocked()
return errors.New("max request jobs reached")
}
atomic.AddInt32(&r.jobs, 1)
err = r.doRequest(req, i)
atomic.AddInt32(&r.jobs, -1)
r.timedLock.UnlockIfLocked()
return err
}
// validateRequest validates the requester item fields
func (i *Item) validateRequest(ctx context.Context, r *Requester) (*http.Request, error) {
if r == nil || r.Name == "" {
return nil, errors.New("not initialised, SetDefaults() called before making request?")
}
if i == nil {
return nil, errors.New("request item cannot be nil")
}
if i.Path == "" {
return nil, errors.New("invalid path")
}
if i.HeaderResponse != nil {
if *i.HeaderResponse == nil {
return nil, errors.New("header response is nil")
}
}
req, err := http.NewRequestWithContext(ctx, i.Method, i.Path, i.Body)
if err != nil {
return nil, err
}
for k, v := range i.Headers {
req.Header.Add(k, v)
}
if r.UserAgent != "" && req.Header.Get(userAgent) == "" {
req.Header.Add(userAgent, r.UserAgent)
}
return req, nil
}
// DoRequest performs a HTTP/HTTPS request with the supplied params
func (r *Requester) doRequest(req *http.Request, p *Item) error {
if p == nil {
return errors.New("request item cannot be nil")
}
if p.Verbose {
log.Debugf(log.RequestSys,
"%s request path: %s",
r.Name,
p.Path)
for k, d := range req.Header {
log.Debugf(log.RequestSys,
"%s request header [%s]: %s",
r.Name,
k,
d)
}
log.Debugf(log.RequestSys,
"%s request type: %s",
r.Name,
req.Method)
if p.Body != nil {
log.Debugf(log.RequestSys,
"%s request body: %v",
r.Name,
p.Body)
}
}
for attempt := 1; ; attempt++ {
// Initiate a rate limit reservation and sleep on requested endpoint
err := r.InitiateRateLimit(p.Endpoint)
if err != nil {
return err
}
resp, err := r.HTTPClient.Do(req)
if retry, checkErr := r.retryPolicy(resp, err); checkErr != nil {
return checkErr
} else if retry {
if err == nil {
// If the body isn't fully read, the connection cannot be re-used
r.drainBody(resp.Body)
}
// Can't currently regenerate nonce and signatures with fresh values for retries, so for now, we must not retry
if p.NonceEnabled {
if timeoutErr, ok := err.(net.Error); !ok || !timeoutErr.Timeout() {
return fmt.Errorf("request.go error - unable to retry request using nonce, err: %v", err)
}
}
if attempt > r.maxRetries {
if err != nil {
return fmt.Errorf("request.go error - failed to retry request, err: %v", err)
}
return fmt.Errorf("request.go error - failed to retry request, status: %s", resp.Status)
}
after := RetryAfter(resp, time.Now())
backoff := r.backoff(attempt)
delay := backoff
if after > backoff {
delay = after
}
if d, ok := req.Context().Deadline(); ok && d.After(time.Now()) && time.Now().Add(delay).After(d) {
if err != nil {
return fmt.Errorf("request.go error - deadline would be exceeded by retry, err: %v", err)
}
return fmt.Errorf("request.go error - deadline would be exceeded by retry, status: %s", resp.Status)
}
if p.Verbose {
log.Errorf(log.RequestSys,
"%s request has failed. Retrying request in %s, attempt %d",
r.Name,
delay,
attempt)
}
time.Sleep(delay)
continue
}
contents, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
if p.HTTPRecording {
// This dumps http responses for future mocking implementations
err = mock.HTTPRecord(resp, r.Name, contents)
if err != nil {
return fmt.Errorf("mock recording failure %s", err)
}
}
if p.HeaderResponse != nil {
for k, v := range resp.Header {
(*p.HeaderResponse)[k] = v
}
}
if resp.StatusCode < http.StatusOK ||
resp.StatusCode > http.StatusAccepted {
return fmt.Errorf("%s unsuccessful HTTP status code: %d raw response: %s",
r.Name,
resp.StatusCode,
string(contents))
}
if p.HTTPDebugging {
dump, err := httputil.DumpResponse(resp, false)
if err != nil {
log.Errorf(log.RequestSys, "DumpResponse invalid response: %v:", err)
}
log.Debugf(log.RequestSys, "DumpResponse Headers (%v):\n%s", p.Path, dump)
log.Debugf(log.RequestSys, "DumpResponse Body (%v):\n %s", p.Path, string(contents))
}
resp.Body.Close()
if p.Verbose {
log.Debugf(log.RequestSys,
"HTTP status: %s, Code: %v",
resp.Status,
resp.StatusCode)
if !p.HTTPDebugging {
log.Debugf(log.RequestSys,
"%s raw response: %s",
r.Name,
string(contents))
}
}
if p.Result != nil {
return json.Unmarshal(contents, p.Result)
}
return nil
}
}
// GetNonce returns a nonce for requests. This locks and enforces concurrent
// nonce FIFO on the buffered job channel
func (r *Requester) GetNonce(isNano bool) nonce.Value {
r.timedLock.LockForDuration()
if r.Nonce.Get() == 0 {
if isNano {
r.Nonce.Set(time.Now().UnixNano())
} else {
r.Nonce.Set(time.Now().Unix())
}
return r.Nonce.Get()
}
r.Nonce.Inc()
return r.Nonce.Get()
}
// GetNonceMilli returns a nonce for requests. This locks and enforces concurrent
// nonce FIFO on the buffered job channel this is for millisecond
func (r *Requester) GetNonceMilli() nonce.Value {
r.timedLock.LockForDuration()
if r.Nonce.Get() == 0 {
r.Nonce.Set(time.Now().UnixNano() / int64(time.Millisecond))
return r.Nonce.Get()
}
r.Nonce.Inc()
return r.Nonce.Get()
}
// SetProxy sets a proxy address to the client transport
func (r *Requester) SetProxy(p *url.URL) error {
if p.String() == "" {
return errors.New("no proxy URL supplied")
}
t, ok := r.HTTPClient.Transport.(*http.Transport)
if !ok {
return errors.New("transport not set, cannot set proxy")
}
t.Proxy = http.ProxyURL(p)
t.TLSHandshakeTimeout = proxyTLSTimeout
return nil
}
func (r *Requester) drainBody(body io.ReadCloser) {
defer body.Close()
if _, err := io.Copy(ioutil.Discard, io.LimitReader(body, drainBodyLimit)); err != nil {
log.Errorf(log.RequestSys,
"%s failed to drain request body %s",
r.Name,
err)
}
}