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move rate-limits related functions to separate file and simplify logic
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* | ||
| Copyright 2023 Akamai Technologies, Inc. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package util | ||
|
|
||
| import ( | ||
| "strconv" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| "github.com/go-resty/resty/v2" | ||
|
|
||
| "github.com/linode/cluster-api-provider-linode/util/reconciler" | ||
| ) | ||
|
|
||
| // PostRequestCounter keeps track of rate limits for POST to /linode/instances | ||
| type PostRequestCounter struct { | ||
| Mu sync.RWMutex | ||
| ReqRemaining int | ||
| RefreshTime int | ||
| } | ||
|
|
||
| var ( | ||
| // mu is global lock to coordinate access to shared resource postRequestCounters | ||
| mu sync.RWMutex | ||
| // postRequestCounters stores token hash and pointer to its equivalent PostRequestCounter | ||
| postRequestCounters = make(map[string]*PostRequestCounter, 0) | ||
| ) | ||
|
|
||
| // ApiResponseRatelimitCounter updates ReqRemaining and RefreshTime when a POST call is made to /linode/instances | ||
| func (c *PostRequestCounter) ApiResponseRatelimitCounter(resp *resty.Response) error { | ||
| if resp.Request.Method != "POST" || !strings.HasSuffix(resp.Request.URL, "/linode/instances") { | ||
| return nil | ||
| } | ||
|
|
||
| var err error | ||
| c.ReqRemaining, err = strconv.Atoi(resp.Header().Get("X-Ratelimit-Remaining")) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| c.RefreshTime, err = strconv.Atoi(resp.Header().Get("X-Ratelimit-Reset")) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // IsPOSTLimitReached checks whether POST limits have been reached. | ||
| func (c *PostRequestCounter) IsPOSTLimitReached(logger logr.Logger) bool { | ||
| // TODO: Once linode API adjusts rate-limits, remove secondary rate limit and simplify accordingly | ||
| if c.ReqRemaining == reconciler.SecondaryPOSTRequestLimit || c.ReqRemaining == 0 { | ||
| actualRefreshTime := c.RefreshTime | ||
| // adjust refresh time based on secondary limit | ||
| if c.ReqRemaining == reconciler.SecondaryPOSTRequestLimit { | ||
| actualRefreshTime = c.RefreshTime - int(reconciler.SecondaryLinodeTooManyPOSTRequestsErrorRetryDelay.Seconds()) | ||
| } | ||
| // check if refresh time has passed | ||
| if time.Now().Unix() <= int64(actualRefreshTime) { | ||
| logger.Info("Cannot make more requests as max requests have been made. Waiting and retrying ...") | ||
| return true | ||
| } else if c.ReqRemaining == 0 { | ||
| // reset limits, set max allowed POST requests to default max | ||
| c.ReqRemaining = reconciler.DefaultPOSTRequestLimit | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| // GetPostReqCounter returns pointer to PostRequestCounter for a given token hash | ||
| func GetPostReqCounter(tokenHash string) *PostRequestCounter { | ||
| mu.Lock() | ||
| defer mu.Unlock() | ||
|
|
||
| ctr, exists := postRequestCounters[tokenHash] | ||
| if !exists { | ||
| ctr = &PostRequestCounter{ | ||
| ReqRemaining: reconciler.DefaultPOSTRequestLimit, | ||
| RefreshTime: 0, | ||
| } | ||
| postRequestCounters[tokenHash] = ctr | ||
| } | ||
| return ctr | ||
| } | ||