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Merge pull request #7446 from rancher-sandbox/remove-listener-only-mo…
…de-guest-agent Remove listener only mode guest agent
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| /* | ||
| Copyright © 2024 SUSE LLC | ||
| 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 forwarder | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| "github.com/Masterminds/log-go" | ||
| "github.com/containers/gvisor-tap-vsock/pkg/types" | ||
| ) | ||
|
|
||
| const ( | ||
| exposeAPI = "/services/forwarder/expose" | ||
| unexposeAPI = "/services/forwarder/unexpose" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrAPI = errors.New("error from API") | ||
| ErrExposeAPI = fmt.Errorf("error from %s API", exposeAPI) | ||
| ErrUnexposeAPI = fmt.Errorf("error from %s API", unexposeAPI) | ||
| ) | ||
|
|
||
| // APIForwarder forwards the PortMappings to /services/forwarder/expose | ||
| // or /services/forwarder/unexpose that is host in the host-switch. | ||
| type APIForwarder struct { | ||
| baseURL string | ||
| httpClient *http.Client | ||
| } | ||
|
|
||
| // NewAPIForwarder returns a new instance of APIForwarder. | ||
| func NewAPIForwarder(baseURL string) *APIForwarder { | ||
| return &APIForwarder{ | ||
| baseURL: baseURL, | ||
| httpClient: http.DefaultClient, | ||
| } | ||
| } | ||
|
|
||
| // Expose calls /services/forwarder/expose with a given portMappings. | ||
| func (a *APIForwarder) Expose(exposeReq *types.ExposeRequest) error { | ||
| bin, err := json.Marshal(exposeReq) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| log.Debugf("sending a HTTP POST to %s API with expose request: %v", exposeAPI, exposeReq) | ||
| req, err := http.NewRequestWithContext( | ||
| context.Background(), | ||
| http.MethodPost, | ||
| a.urlBuilder(exposeAPI), | ||
| bytes.NewReader(bin)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| res, err := a.httpClient.Do(req) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return verifyResponseBody(res) | ||
| } | ||
|
|
||
| // Unexpose calls /services/forwarder/unexpose with a given portMappings. | ||
| func (a *APIForwarder) Unexpose(unexposeReq *types.UnexposeRequest) error { | ||
| bin, err := json.Marshal(unexposeReq) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| log.Debugf("sending a HTTP POST to %s API with unexpose request: %v", unexposeAPI, unexposeReq) | ||
| req, err := http.NewRequestWithContext( | ||
| context.Background(), | ||
| http.MethodPost, | ||
| a.urlBuilder(unexposeAPI), | ||
| bytes.NewReader(bin)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| res, err := a.httpClient.Do(req) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return verifyResponseBody(res) | ||
| } | ||
|
|
||
| func (a *APIForwarder) urlBuilder(api string) string { | ||
| return a.baseURL + api | ||
| } | ||
|
|
||
| func verifyResponseBody(res *http.Response) error { | ||
| defer res.Body.Close() | ||
|
|
||
| if res.StatusCode != http.StatusOK { | ||
| apiResponse, readErr := io.ReadAll(res.Body) | ||
| if readErr != nil { | ||
| return fmt.Errorf("error while reading response body: %w", readErr) | ||
| } | ||
|
|
||
| errMsg := strings.TrimSpace(string(apiResponse)) | ||
|
|
||
| return fmt.Errorf("%w: %s", ErrAPI, errMsg) | ||
| } | ||
|
|
||
| return nil | ||
| } |
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