79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
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package model
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import (
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"fmt"
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"strings"
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"modelRT/constants"
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"modelRT/orm"
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)
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var allowedMeasurementTypes = map[string]struct{}{
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"TM": {},
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"TS": {},
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"TC": {},
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"TA": {},
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"SP": {},
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}
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// MeasurementTypeFromDataSource returns the two-character measurement type
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// encoded in a CL3611 channel. Only TM, TS, TC, TA, and SP are valid.
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func MeasurementTypeFromDataSource(dataSource orm.JSONMap) (string, error) {
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dataSourceType, err := integerJSONValue(dataSource["type"])
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if err != nil {
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return "", fmt.Errorf("invalid measurement data_source type: %w", err)
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}
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if dataSourceType != constants.DataSourceTypeCL3611 {
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return "", fmt.Errorf("measurement type requires data_source type %d, got %d", constants.DataSourceTypeCL3611, dataSourceType)
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}
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ioAddress, ok := dataSource["io_address"].(map[string]any)
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if !ok {
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if value, jsonMapOK := dataSource["io_address"].(orm.JSONMap); jsonMapOK {
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ioAddress = map[string]any(value)
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} else {
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return "", fmt.Errorf("measurement data_source io_address is not an object")
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}
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}
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channel, ok := ioAddress["channel"].(string)
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if !ok || len(channel) < 2 {
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return "", fmt.Errorf("measurement data_source channel must contain at least two characters")
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}
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measurementType := strings.ToUpper(channel[:2])
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if _, ok := allowedMeasurementTypes[measurementType]; !ok {
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return "", fmt.Errorf("unsupported measurement type %q", measurementType)
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}
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return measurementType, nil
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}
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func integerJSONValue(value any) (int, error) {
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switch typed := value.(type) {
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case int:
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return typed, nil
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case int8:
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return int(typed), nil
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case int16:
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return int(typed), nil
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case int32:
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return int(typed), nil
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case int64:
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return int(typed), nil
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case float32:
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converted := int(typed)
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if typed != float32(converted) {
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return 0, fmt.Errorf("expected integer, got %v", typed)
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}
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return converted, nil
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case float64:
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converted := int(typed)
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if typed != float64(converted) {
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return 0, fmt.Errorf("expected integer, got %v", typed)
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}
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return converted, nil
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default:
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return 0, fmt.Errorf("expected integer, got %T", value)
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}
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}
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