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Fetch respective metadata (cluster name, cluster location, or instanc…
…e zone) (#16) Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,57 +1,90 @@ | ||
| package metadata | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "strings" | ||
| ) | ||
|
|
||
| func GetMetadata(w http.ResponseWriter, r *http.Request) { | ||
| // Extract the path parameter from the URL | ||
| metadataType := r.URL.Path[len("/gke-info/"):] | ||
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| var metadataURL string | ||
|
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| // Only allow fetching the cluster name for security reasons | ||
| if metadataType == "cluster-name" { | ||
| } else { | ||
| http.Error(w, "Request not allowed", http.StatusForbidden) | ||
| return | ||
| } | ||
|
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| // Construct the metadata URL dynamically | ||
| metadataURL = fmt.Sprintf("http://metadata.google.internal/computeMetadata/v1/instance/attributes/%s", metadataType) | ||
|
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| // Set the metadata request headers | ||
| req, err := http.NewRequest("GET", metadataURL, nil) | ||
| if err != nil { | ||
| http.Error(w, fmt.Sprintf("Error creating request: %v", err), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| req.Header.Set("Metadata-Flavor", "Google") | ||
|
|
||
| // Send the request to the metadata server | ||
| client := &http.Client{} | ||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| http.Error(w, fmt.Sprintf("Error retrieving metadata: %v", err), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| // Check the response status code | ||
| if resp.StatusCode != http.StatusOK { | ||
| http.Error(w, fmt.Sprintf("Error retrieving metadata, status code: %d", resp.StatusCode), http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
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| // Set the Content-Type header to JSON | ||
| w.Header().Set("Content-Type", "application/json") | ||
|
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| // Copy the response from the metadata server to the output | ||
| _, err = io.Copy(w, resp.Body) | ||
| if err != nil { | ||
| http.Error(w, fmt.Sprintf("Error writing response: %v", err), http.StatusInternalServerError) | ||
| return | ||
| } | ||
| // Metadata server URLs | ||
| const ( | ||
| clusterNameURL = "http://metadata.google.internal/computeMetadata/v1/instance/attributes/cluster-name" | ||
| clusterLocationURL = "http://metadata.google.internal/computeMetadata/v1/instance/attributes/cluster-location" | ||
| instanceZoneURL = "http://metadata.google.internal/computeMetadata/v1/instance/zone" | ||
| ) | ||
|
|
||
| // fetchMetadata fetches metadata from the provided URL | ||
| func fetchMetadata(url string) (string, error) { | ||
| req, err := http.NewRequest("GET", url, nil) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
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| // Adding the metadata flavor header as required by GCP metadata server | ||
| req.Header.Add("Metadata-Flavor", "Google") | ||
|
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| client := &http.Client{} | ||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| return "", fmt.Errorf("failed to get metadata from %s, status code: %d", url, resp.StatusCode) | ||
| } | ||
|
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| body, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
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| return string(body), nil | ||
| } | ||
|
|
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| // metadataHandler handles the /metadata/* endpoint | ||
| func MetadataHandler(w http.ResponseWriter, r *http.Request) { | ||
| pathParts := strings.Split(r.URL.Path, "/") | ||
| if len(pathParts) < 3 { | ||
| http.Error(w, "Invalid request", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
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| metadataType := pathParts[2] | ||
| var url string | ||
|
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| switch metadataType { | ||
| case "cluster-name": | ||
| url = clusterNameURL | ||
| case "cluster-location": | ||
| url = clusterLocationURL | ||
| case "instance-zone": | ||
| url = instanceZoneURL | ||
| default: | ||
| http.Error(w, "Unknown metadata type", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
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| metadata, err := fetchMetadata(url) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
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| // If instance zone, extract just the zone from the full zone URL | ||
| if metadataType == "instance-zone" { | ||
| instanceZoneParts := strings.Split(metadata, "/") | ||
| if len(instanceZoneParts) > 0 { | ||
| metadata = instanceZoneParts[len(instanceZoneParts)-1] | ||
| } | ||
| } | ||
|
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| response := map[string]string{metadataType: metadata} | ||
| w.Header().Set("Content-Type", "application/json") | ||
| json.NewEncoder(w).Encode(response) | ||
| if err := json.NewEncoder(w).Encode(response); err != nil { | ||
| http.Error(w, "Failed to encode response", http.StatusInternalServerError) | ||
| } | ||
| } |