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|
package eax
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"strconv"
"sync"
"time"
)
// UpdateMgr manages EAX client version information.
type UpdateMgr struct {
// HTTP client to use. If not provided, [net/http.DefaultClient] will be
// used.
Client *http.Client
// Timeout is the timeout for refreshing tokens. If zero, a reasonable
// default is used. If negative, there is no timeout.
Timeout time.Duration
// Interval to update at. If zero, will not auto-update.
AutoUpdateInterval time.Duration
// Auto-update staged roll-out bucket.
AutoUpdateBucket int
// Auto-update backoff, if provided, checks if another auto-update is
// allowed after a failure. If it returns false, ErrAutoUpdateBackoff will be
// returned from the function triggering the auto-update.
AutoUpdateBackoff func(err error, time time.Time, count int) bool
// AutoUpdateHook is called for every auto-update attempt with the new (or
// current if error) version, and any error which occurred.
AutoUpdateHook func(v string, err error)
verInit sync.Once
verPf bool // ensures only one auto-update runs at a time
verCv *sync.Cond // allows other goroutines to wait for that update to complete
verErr error // last auto-update error
verErrTime time.Time // last auto-update error time
verErrCount int // consecutive auto-update errors
ver string // current version
verTime time.Time // last update check time
}
var ErrAutoUpdateBackoff = errors.New("not updating eax client version due to backoff")
func (u *UpdateMgr) init() {
u.verInit.Do(func() {
u.verCv = sync.NewCond(new(sync.Mutex))
})
}
// SetVersion sets the current version.
func (u *UpdateMgr) SetVersion(v string) {
u.init()
u.verCv.L.Lock()
for u.verPf {
u.verCv.Wait()
}
u.ver = v
u.verErr = nil
u.verTime = time.Now()
u.verCv.L.Unlock()
}
// Update gets the latest version, following u.AutoUpdateInterval if provided,
// unless the version is not set or force is true. If another update is in
// progress, it waits for the result of it. True is returned (on success or
// failure) if this call performed a update. This function may block for up to
// Timeout.
func (u *UpdateMgr) Update(force bool) (string, bool, error) {
u.init()
if u.verCv.L.Lock(); u.verPf {
for u.verPf {
u.verCv.Wait()
}
defer u.verCv.L.Unlock()
return u.ver, false, u.verErr
} else {
if force || u.ver == "" || (u.AutoUpdateInterval != 0 && time.Since(u.verTime) > u.AutoUpdateInterval) {
u.verPf = true
u.verCv.L.Unlock()
defer func() {
u.verCv.L.Lock()
u.verCv.Broadcast()
u.verPf = false
u.verCv.L.Unlock()
}()
} else {
defer u.verCv.L.Unlock()
return u.ver, false, u.verErr
}
}
if u.verErr != nil && u.AutoUpdateBackoff != nil {
if !u.AutoUpdateBackoff(u.verErr, u.verErrTime, u.verErrCount) {
return u.ver, true, fmt.Errorf("%w (%d attempts, last error: %v)", ErrAutoUpdateBackoff, u.verErrCount, u.verErr)
}
}
u.verErr = func() error {
var ctx context.Context
var cancel context.CancelFunc
if u.Timeout > 0 {
ctx, cancel = context.WithTimeout(context.Background(), u.Timeout)
} else if u.Timeout == 0 {
ctx, cancel = context.WithTimeout(context.Background(), time.Second*15)
} else {
ctx, cancel = context.WithCancel(context.Background())
}
defer cancel()
req, err := http.NewRequestWithContext(ctx, http.MethodGet, "https://autopatch.juno.ea.com/autopatch/upgrade/buckets/"+strconv.Itoa(u.AutoUpdateBucket), nil)
if err != nil {
return err
}
if u.ver != "" {
req.Header.Set("User-Agent", "EADesktop/"+u.ver)
} else {
req.Header.Set("User-Agent", "")
}
cl := u.Client
if cl == nil {
cl = http.DefaultClient
}
resp, err := cl.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
var obj struct {
Minimum struct {
Version string `json:"version"`
ActivationDate string `json:"activationDate"`
} `json:"minimum"`
Recommended struct {
Version string `json:"version"`
} `json:"recommended"`
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("response status %d (%s)", resp.StatusCode, resp.Status)
}
if err := json.NewDecoder(resp.Body).Decode(&obj); err != nil {
return fmt.Errorf("parse autopatch response: %w", err)
}
var version string
if v := obj.Minimum.Version; v != "" {
version = v
}
if v := obj.Recommended.Version; v != "" {
version = v
}
if version == "" {
return fmt.Errorf("parse autopatch response: missing minimum or recommended version")
}
u.ver = version
u.verTime = time.Now()
return nil
}()
if u.verErrCount != 0 {
u.verErr = fmt.Errorf("%w (attempt %d)", u.verErr, u.verErrCount)
}
if u.verErr != nil {
u.verErrCount++
u.verErrTime = time.Now()
} else {
u.verErrCount = 0
u.verErrTime = time.Time{}
}
if u.AutoUpdateHook != nil {
go u.AutoUpdateHook(u.ver, u.verErr)
}
return u.ver, true, u.verErr
}
|
