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types.go
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types.go
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package powerwall
import (
"encoding/json"
"strings"
"time"
)
// Most time values in the API are produced in standard ISO-8601 format, which
// works just fine for unmarshalling to time.Time as well. However, the
// "start_time" field of the status API call is not returned in this format for
// some reason and thus will not unmarshal directly to a time.Time value. We
// provide a custom type to handle this case.
type NonIsoTime struct {
time.Time
}
const nonIsoTimeFormat = "2006-01-02 15:04:05 -0700"
func (v *NonIsoTime) UnmarshalJSON(p []byte) error {
t, err := time.Parse(nonIsoTimeFormat, strings.Replace(string(p), `"`, ``, -1))
if err == nil {
*v = NonIsoTime{t}
}
return err
}
// Durations in the API are typically represented as strings in duration-string
// format ("1h23m45.67s", etc). Go's time.Duration type actually produces this
// format natively, yet will not parse it as an input when unmarshalling JSON
// (grr), so we need a custom type (with a custom UnmarshalJSON function) to
// handle this.
type Duration struct {
time.Duration
}
func (v *Duration) UnmarshalJSON(p []byte) error {
d, err := time.ParseDuration(strings.Replace(string(p), `"`, ``, -1))
if err == nil {
*v = Duration{d}
}
return err
}
func (v *Duration) MarshalJSON() ([]byte, error) {
return json.Marshal(v.String())
}
// The DecodedAlert type is used for unpacking values in the "decoded_alert"
// field of GridFault structures. These are actually encoded as a string,
// which itself contains a JSON representation of a list of maps, each one
// containing a "name" and "value". For example:
//
// "[{\"name\":\"PINV_alertID\",\"value\":\"PINV_a008_vfCheckRocof\"},{\"name\":\"PINV_alertType\",\"value\":\"Warning\"}]"
//
// Needless to say, this encoding is rather cumbersome and redundant, so we
// instead provide a custom JSON decoder to decode these into a string/string
// map in the form 'name: value'.
type DecodedAlert map[string]string
func (v *DecodedAlert) UnmarshalJSON(data []byte) error {
type entry struct {
Name string `json:"name"`
Value string `json:"value"`
}
strvalue := ""
err := json.Unmarshal(data, &strvalue)
if err != nil {
return err
}
if strvalue == "" {
// For an empty string, just return a nil map
return nil
}
entries := []entry{}
err = json.Unmarshal([]byte(strvalue), &entries)
if err != nil {
return err
}
*v = make(map[string]string, len(entries))
for _, e := range entries {
(*v)[e.Name] = e.Value
}
return nil
}