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feat: add http provider for rate limit config
Signed-off-by: Lu Xie <luxie@roblox.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package httpprovider | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| logger "github.com/sirupsen/logrus" | ||
|
|
||
| "github.com/envoyproxy/ratelimit/src/config" | ||
| ) | ||
|
|
||
| type HttpProvider struct { | ||
| Endpoint string | ||
| Subpath []string | ||
| PollInterval time.Duration | ||
| PollTimeout time.Duration | ||
| ConfigChan chan []config.RateLimitConfigToLoad | ||
| httpClient *http.Client | ||
| StopChan chan bool | ||
| } | ||
|
|
||
| func NewHttpProvider(endpoint string, subpath []string, pollInterval time.Duration, pollTimeout time.Duration) *HttpProvider { | ||
| return &HttpProvider{ | ||
| Endpoint: endpoint, | ||
| Subpath: subpath, | ||
| PollInterval: pollInterval, | ||
| ConfigChan: make(chan []config.RateLimitConfigToLoad), | ||
| httpClient: &http.Client{ | ||
| Timeout: pollTimeout, | ||
| }, | ||
| StopChan: make(chan bool), | ||
| } | ||
| } | ||
|
|
||
| func (p *HttpProvider) Provide() error { | ||
| for { | ||
| select { | ||
| case <-p.StopChan: | ||
| return nil | ||
| default: | ||
| configs, err := p.fetchConfigurationData() | ||
| if err != nil { | ||
| logger.Errorf("Failed to fetch the configuration: %+v", err) | ||
| time.Sleep(p.PollInterval) | ||
| continue | ||
| } | ||
| p.ConfigChan <- configs | ||
| time.Sleep(p.PollInterval) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (p *HttpProvider) Stop() { | ||
| p.StopChan <- true | ||
| } | ||
|
|
||
| // fetchConfigurationData fetches the configuration data from the configured endpoint. | ||
| func (p *HttpProvider) fetchConfigurationData() ([]config.RateLimitConfigToLoad, error) { | ||
| configs := []config.RateLimitConfigToLoad{} | ||
|
|
||
| urls := []string{} | ||
| if len(p.Subpath) == 0 { | ||
| urls = append(urls, p.Endpoint) | ||
| } else { | ||
| for _, path := range p.Subpath { | ||
| urls = append(urls, fmt.Sprintf("%s/%s", p.Endpoint, path)) | ||
| } | ||
| } | ||
|
|
||
| for _, url := range urls { | ||
| res, err := p.httpClient.Get(url) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| defer res.Body.Close() | ||
|
|
||
| if res.StatusCode != http.StatusOK { | ||
| return nil, fmt.Errorf("received non-ok response code: %d from the endpoint: %s", res.StatusCode, url) | ||
| } | ||
|
|
||
| body, err := io.ReadAll(res.Body) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| configs = append(configs, config.RateLimitConfigToLoad{url, string(body)}) | ||
| } | ||
| return configs, nil | ||
| } |
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