57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package err
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import (
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"encoding/json"
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"fmt"
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)
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// Error represents an http response error following the api format.
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// These are used by the controllers to set the *execution status*
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// directly into the response as JSON alongside response output fields.
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type Error struct {
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Code int
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Reason string
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Arguments []interface{}
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}
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// Put adds an argument to the error
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// to be displayed back to API caller
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func (e *Error) Put(arg interface{}) {
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/* (1) Make slice if not */
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if e.Arguments == nil {
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e.Arguments = make([]interface{}, 0)
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}
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/* (2) Append argument */
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e.Arguments = append(e.Arguments, arg)
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}
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// Implements 'error'
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func (e Error) Error() string {
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return fmt.Sprintf("[%d] %s", e.Code, e.Reason)
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}
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// MarshalJSON implements the 'json.Marshaler' interface and is used
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// to generate the JSON representation of the error data
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func (e Error) MarshalJSON() ([]byte, error) {
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var jsonArguments string
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/* (1) Marshal 'Arguments' if set */
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if e.Arguments != nil && len(e.Arguments) > 0 {
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argRepresentation, err := json.Marshal(e.Arguments)
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if err == nil {
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jsonArguments = fmt.Sprintf(",\"arguments\":%s", argRepresentation)
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}
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}
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/* (2) Render JSON manually */
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return []byte(fmt.Sprintf("{\"error\":%d,\"reason\":\"%s\"%s}", e.Code, e.Reason, jsonArguments)), nil
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}
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