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token721_handler.go
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/
token721_handler.go
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package database
import (
"fmt"
"strings"
)
// Token721ContractName name of basic token contract
const Token721ContractName = "token721.iost"
// Token721Handler easy to get balance of token.iost
type Token721Handler struct {
db database
}
func (m *Token721Handler) balanceKey(tokenName, acc string) string {
return "m-" + Token721ContractName + "-" + "T721B" + acc + "-" + tokenName
}
func (m *Token721Handler) idKey(tokenName, acc string) string {
return "m-" + Token721ContractName + "-" + "T721M" + tokenName + "#" + acc
}
func (m *Token721Handler) metadataKey(tokenName, acc, tokenID string) string {
return "m-" + Token721ContractName + "-" + "T721M" + tokenName + "#" + acc + "-" + tokenID
}
func (m *Token721Handler) ownerKey(tokenName, tokenID string) string {
return "m-" + Token721ContractName + "-" + "T721I" + tokenName + "-" + tokenID
}
// Token721Balance get token balance of acc
func (m *Token721Handler) Token721Balance(tokenName, acc string) int64 {
currentRaw := m.db.Get(m.balanceKey(tokenName, acc))
balance := Unmarshal(currentRaw)
ib, ok := balance.(int64)
if !ok {
ib = 0
}
return ib
}
// Token721IDList get token balance of acc
func (m *Token721Handler) Token721IDList(tokenName, acc string) []string {
ids := m.db.Get(m.idKey(tokenName, acc))
if len(ids) == 0 {
return []string{}
}
return strings.Split(ids, "@")[1:]
}
// Token721Metadata get token balance of acc
func (m *Token721Handler) Token721Metadata(tokenName, tokenID string) (string, error) {
owner, err := m.Token721Owner(tokenName, tokenID)
if err != nil {
return "", err
}
currentRaw := m.db.Get(m.metadataKey(tokenName, owner, tokenID))
metadata, ok := Unmarshal(currentRaw).(string)
if !ok {
return "", nil
}
return metadata, nil
}
// Token721Owner get token owner of tokenID
func (m *Token721Handler) Token721Owner(tokenName, tokenID string) (string, error) {
currentRaw := m.db.Get(m.ownerKey(tokenName, tokenID))
owner, ok := Unmarshal(currentRaw).(string)
if !ok || owner == "" {
return "", fmt.Errorf("token %v %v not found", tokenName, tokenID)
}
return owner, nil
}