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66 lines
2.1 KiB
Go
66 lines
2.1 KiB
Go
package ml
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import (
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"fmt"
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"strings"
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"time"
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"github.com/grafana/grafana-plugin-sdk-go/backend"
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jsoniter "github.com/json-iterator/go"
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"github.com/grafana/grafana/pkg/api/response"
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)
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var json = jsoniter.ConfigCompatibleWithStandardLibrary
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type CommandType string
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const (
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Outlier CommandType = "outlier"
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// format of the time used by outlier API
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timeFormat = "2006-01-02T15:04:05.999999999"
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defaultInterval = 1000 * time.Millisecond
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)
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// Command is an interface implemented by all Machine Learning commands that can be executed against ML API.
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type Command interface {
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// DatasourceUID returns UID of a data source that is used by machine learning as the source of data
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DatasourceUID() string
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// Execute creates a payload send request to the ML API by calling the function argument sendRequest, and then parses response.
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// Function sendRequest is supposed to abstract the client configuration such creating http request, adding authorization parameters, host etc.
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Execute(from, to time.Time, sendRequest func(method string, path string, payload []byte) (response.Response, error)) (*backend.QueryDataResponse, error)
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Type() string
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}
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// UnmarshalCommand parses a config parameters and creates a command. Requires key `type` to be specified.
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// Based on the value of `type` field it parses a Command
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func UnmarshalCommand(query []byte, appURL string) (Command, error) {
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var expr CommandConfiguration
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err := json.Unmarshal(query, &expr)
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if err != nil {
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return nil, fmt.Errorf("failed to unmarshal Machine learning command: %w", err)
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}
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if len(expr.Type) == 0 {
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return nil, fmt.Errorf("required field 'type' is not specified or empty. Should be one of [%s]", Outlier)
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}
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if len(expr.Config) == 0 {
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return nil, fmt.Errorf("required field 'config' is not specified")
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}
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var cmd Command
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switch mlType := strings.ToLower(expr.Type); mlType {
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case string(Outlier):
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cmd, err = unmarshalOutlierCommand(expr, appURL)
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default:
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return nil, fmt.Errorf("unsupported command type. Should be one of [%s]", Outlier)
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}
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if err != nil {
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return nil, fmt.Errorf("failed to unmarshal Machine learning %s command: %w", expr.Type, err)
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}
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return cmd, nil
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}
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