Martino Ferrari
68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
package epics
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import (
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"encoding/json"
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"fmt"
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"log/slog"
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"net/http"
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"strings"
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"time"
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)
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// cfChannel is the JSON structure returned by the Channel Finder Service.
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type cfChannel struct {
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Name string `json:"name"`
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Owner string `json:"owner"`
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Properties []cfProperty `json:"properties"`
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Tags []cfTag `json:"tags"`
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}
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type cfProperty struct {
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Name string `json:"name"`
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Value string `json:"value"`
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Owner string `json:"owner"`
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}
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type cfTag struct {
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Name string `json:"name"`
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Owner string `json:"owner"`
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}
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// queryChannelFinder fetches channels from CFS matching the given query string.
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func queryChannelFinder(cfURL, query string) ([]cfChannel, error) {
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if cfURL == "" {
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return nil, nil
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}
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url := strings.TrimRight(cfURL, "/") + "/resources/channels"
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if query != "" {
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if strings.Contains(query, "=") || strings.Contains(query, "~") {
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// Query is already a structured filter (e.g. area=L1)
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url += "?" + query
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} else {
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// Query is just a PV name pattern
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url += "?~name=*" + query + "*"
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}
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}
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client := &http.Client{Timeout: 10 * time.Second}
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slog.Info("CFS query", "url", url)
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resp, err := client.Get(url)
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if err != nil {
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return nil, fmt.Errorf("CFS request failed: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("CFS returned status %d", resp.StatusCode)
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}
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var channels []cfChannel
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if err := json.NewDecoder(resp.Body).Decode(&channels); err != nil {
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return nil, fmt.Errorf("CFS response parse error: %w", err)
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}
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slog.Info("CFS results", "count", len(channels))
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return channels, nil
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}
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