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Better support for retrying failed requests with the API

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Also implements more logic error returns from the Get/Post functions in the client, rather than making the developer call r.Error() on responses.
This commit is contained in:
Dane Everitt 2021-05-02 15:41:02 -07:00
parent 3f47bfd292
commit 49dd1f7bde
5 changed files with 71 additions and 93 deletions
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33
remote/errors.go
View File

@ -3,6 +3,8 @@ package remote
import (
"fmt"
"net/http"
"emperror.dev/errors"
)
type RequestErrors struct {
@ -16,13 +18,31 @@ type RequestError struct {
Detail string `json:"detail"`
}
// IsRequestError checks if the given error is of the RequestError type.
func IsRequestError(err error) bool {
_, ok := err.(*RequestError)
return ok
var rerr *RequestError
if err == nil {
return false
}
return errors.As(err, &rerr)
}
// Returns the error response in a string form that can be more easily consumed.
// AsRequestError transforms the error into a RequestError if it is currently
// one, checking the wrap status from the other error handlers. If the error
// is not a RequestError nil is returned.
func AsRequestError(err error) *RequestError {
if err == nil {
return nil
}
var rerr *RequestError
if errors.As(err, &rerr) {
return rerr
}
return nil
}
// Error returns the error response in a string form that can be more easily
// consumed.
func (re *RequestError) Error() string {
c := 0
if re.response != nil {
@ -32,6 +52,11 @@ func (re *RequestError) Error() string {
return fmt.Sprintf("Error response from Panel: %s: %s (HTTP/%d)", re.Code, re.Detail, c)
}
// StatusCode returns the status code of the response.
func (re *RequestError) StatusCode() int {
return re.response.StatusCode
}
type SftpInvalidCredentialsError struct {
}

24
remote/http.go
View File

@ -97,7 +97,7 @@ func (c *client) Post(ctx context.Context, path string, data interface{}) (*Resp
// over this method when possible. It appends the path to the endpoint of the
// client and adds the authentication token to the request.
func (c *client) requestOnce(ctx context.Context, method, path string, body io.Reader, opts ...func(r *http.Request)) (*Response, error) {
req, err := http.NewRequest(method, c.baseUrl+path, body)
req, err := http.NewRequestWithContext(ctx, method, c.baseUrl+path, body)
if err != nil {
return nil, err
}
@ -114,7 +114,7 @@ func (c *client) requestOnce(ctx context.Context, method, path string, body io.R
debugLogRequest(req)
res, err := c.httpClient.Do(req.WithContext(ctx))
res, err := c.httpClient.Do(req)
return &Response{res}, err
}
@ -140,10 +140,14 @@ func (c *client) request(ctx context.Context, method, path string, body io.Reade
}
res = r
if r.HasError() {
// Close the request body after returning the error to free up resources.
defer r.Body.Close()
// Don't keep spamming the endpoint if we've already made too many requests or
// if we're not even authenticated correctly. Retrying generally won't fix either
// of these issues.
if r.StatusCode == http.StatusTooManyRequests || r.StatusCode == http.StatusUnauthorized {
if r.StatusCode == http.StatusForbidden ||
r.StatusCode == http.StatusTooManyRequests ||
r.StatusCode == http.StatusUnauthorized {
return backoff.Permanent(r.Error())
}
return r.Error()
@ -151,10 +155,6 @@ func (c *client) request(ctx context.Context, method, path string, body io.Reade
return nil
}, c.backoff(ctx))
if err != nil {
var rerr *RequestError
if errors.As(err, &rerr) {
return res, nil
}
if v, ok := err.(*backoff.PermanentError); ok {
return nil, v.Unwrap()
}
@ -220,15 +220,12 @@ func (r *Response) HasError() bool {
func (r *Response) Read() ([]byte, error) {
var b []byte
if r.Response == nil {
return nil, errors.New("http: attempting to read missing response")
return nil, errors.New("remote: attempting to read missing response")
}
if r.Response.Body != nil {
b, _ = ioutil.ReadAll(r.Response.Body)
}
r.Response.Body = ioutil.NopCloser(bytes.NewBuffer(b))
return b, nil
}
@ -240,9 +237,8 @@ func (r *Response) BindJSON(v interface{}) error {
if err != nil {
return err
}
if err := json.Unmarshal(b, &v); err != nil {
return errors.Wrap(err, "http: could not unmarshal response")
return errors.Wrap(err, "remote: could not unmarshal response")
}
return nil
}
@ -272,7 +268,7 @@ func (r *Response) Error() error {
e.response = r.Response
return e
return errors.WithStackDepth(e, 1)
}
// Logs the request into the debug log with all of the important request bits.

70
remote/servers.go
View File

@ -60,9 +60,9 @@ func (c *client) GetServers(ctx context.Context, limit int) ([]RawServerData, er
func (c *client) ResetServersState(ctx context.Context) error {
res, err := c.Post(ctx, "/servers/reset", nil)
if err != nil {
return errors.WrapIf(err, "remote/servers: failed to reset server state on Panel")
return errors.WrapIf(err, "remote: failed to reset server state on Panel")
}
res.Body.Close()
_ = res.Body.Close()
return nil
}
@ -74,10 +74,6 @@ func (c *client) GetServerConfiguration(ctx context.Context, uuid string) (Serve
}
defer res.Body.Close()
if res.HasError() {
return config, res.Error()
}
err = res.BindJSON(&config)
return config, err
}
@ -89,10 +85,6 @@ func (c *client) GetInstallationScript(ctx context.Context, uuid string) (Instal
}
defer res.Body.Close()
if res.HasError() {
return InstallationScript{}, res.Error()
}
var config InstallationScript
err = res.BindJSON(&config)
return config, err
@ -103,8 +95,8 @@ func (c *client) SetInstallationStatus(ctx context.Context, uuid string, success
if err != nil {
return err
}
defer resp.Body.Close()
return resp.Error()
_ = resp.Body.Close()
return nil
}
func (c *client) SetArchiveStatus(ctx context.Context, uuid string, successful bool) error {
@ -112,8 +104,8 @@ func (c *client) SetArchiveStatus(ctx context.Context, uuid string, successful b
if err != nil {
return err
}
defer resp.Body.Close()
return resp.Error()
_ = resp.Body.Close()
return nil
}
func (c *client) SetTransferStatus(ctx context.Context, uuid string, successful bool) error {
@ -125,8 +117,8 @@ func (c *client) SetTransferStatus(ctx context.Context, uuid string, successful
if err != nil {
return err
}
defer resp.Body.Close()
return resp.Error()
_ = resp.Body.Close()
return nil
}
// ValidateSftpCredentials makes a request to determine if the username and
@ -138,27 +130,18 @@ func (c *client) ValidateSftpCredentials(ctx context.Context, request SftpAuthRe
var auth SftpAuthResponse
res, err := c.Post(ctx, "/sftp/auth", request)
if err != nil {
if err := AsRequestError(err); err != nil && (err.StatusCode() >= 400 && err.StatusCode() < 500) {
log.WithFields(log.Fields{"subsystem": "sftp", "username": request.User, "ip": request.IP}).Warn(err.Error())
return auth, &SftpInvalidCredentialsError{}
}
return auth, err
}
defer res.Body.Close()
e := res.Error()
if e != nil {
if res.StatusCode >= 400 && res.StatusCode < 500 {
log.WithFields(log.Fields{
"subsystem": "sftp",
"username": request.User,
"ip": request.IP,
}).Warn(e.Error())
return auth, &SftpInvalidCredentialsError{}
}
return auth, errors.New(e.Error())
if err := res.BindJSON(&auth); err != nil {
return auth, err
}
err = res.BindJSON(&auth)
return auth, err
return auth, nil
}
func (c *client) GetBackupRemoteUploadURLs(ctx context.Context, backup string, size int64) (BackupRemoteUploadResponse, error) {
@ -168,13 +151,10 @@ func (c *client) GetBackupRemoteUploadURLs(ctx context.Context, backup string, s
return data, err
}
defer res.Body.Close()
if res.HasError() {
return data, res.Error()
if err := res.BindJSON(&data); err != nil {
return data, err
}
err = res.BindJSON(&data)
return data, err
return data, nil
}
func (c *client) SetBackupStatus(ctx context.Context, backup string, data BackupRequest) error {
@ -182,8 +162,8 @@ func (c *client) SetBackupStatus(ctx context.Context, backup string, data Backup
if err != nil {
return err
}
defer resp.Body.Close()
return resp.Error()
_ = resp.Body.Close()
return nil
}
// SendRestorationStatus triggers a request to the Panel to notify it that a
@ -194,8 +174,8 @@ func (c *client) SendRestorationStatus(ctx context.Context, backup string, succe
if err != nil {
return err
}
defer resp.Body.Close()
return resp.Error()
_ = resp.Body.Close()
return nil
}
// getServersPaged returns a subset of servers from the Panel API using the
@ -214,12 +194,8 @@ func (c *client) getServersPaged(ctx context.Context, page, limit int) ([]RawSer
return nil, r.Meta, err
}
defer res.Body.Close()
if res.HasError() {
return nil, r.Meta, res.Error()
}
if err := res.BindJSON(&r); err != nil {
return nil, r.Meta, err
}
return r.Data, r.Meta, nil
}
}

26
server/install.go
View File

@ -90,13 +90,8 @@ func (s *Server) Reinstall() error {
func (s *Server) internalInstall() error {
script, err := s.client.GetInstallationScript(s.Context(), s.Id())
if err != nil {
if !remote.IsRequestError(err) {
return err
}
return errors.New(err.Error())
return err
}
p, err := NewInstallationProcess(s, &script)
if err != nil {
return err
@ -535,19 +530,10 @@ func (ip *InstallationProcess) StreamOutput(ctx context.Context, id string) erro
return nil
}
// Makes a HTTP request to the Panel instance notifying it that the server has
// completed the installation process, and what the state of the server is. A boolean
// value of "true" means everything was successful, "false" means something went
// wrong and the server must be deleted and re-created.
// SyncInstallState makes a HTTP request to the Panel instance notifying it that
// the server has completed the installation process, and what the state of the
// server is. A boolean value of "true" means everything was successful, "false"
// means something went wrong and the server must be deleted and re-created.
func (s *Server) SyncInstallState(successful bool) error {
err := s.client.SetInstallationStatus(s.Context(), s.Id(), successful)
if err != nil {
if !remote.IsRequestError(err) {
return err
}
return errors.New(err.Error())
}
return nil
return s.client.SetInstallationStatus(s.Context(), s.Id(), successful)
}

11
server/server.go
View File

@ -3,6 +3,7 @@ package server
import (
"context"
"fmt"
"net/http"
"os"
"strings"
"sync"
@ -152,17 +153,11 @@ func (s *Server) Log() *log.Entry {
func (s *Server) Sync() error {
cfg, err := s.client.GetServerConfiguration(s.Context(), s.Id())
if err != nil {
if !remote.IsRequestError(err) {
return err
}
if err.(*remote.RequestError).Status == "404" {
if err := remote.AsRequestError(err); err != nil && err.StatusCode() == http.StatusNotFound {
return &serverDoesNotExist{}
}
return errors.New(err.Error())
return errors.WithStackIf(err)
}
return s.SyncWithConfiguration(cfg)
}