LedgerManager provides access to the ledger infrastructure
type LedgerManager interface {
// Returns a LedgerReader for the passed channel, an error otherwise
GetLedgerReader(channel string) (LedgerReader, error)
}
LedgerReader interface, used to read from a ledger.
type LedgerReader interface {
// GetState gets the value for given namespace and key. For a chaincode, the namespace corresponds to the chaincodeId
GetState(namespace string, key string) ([]byte, error)
// GetStateRangeScanIterator returns an iterator that contains all the Key-values between given Key ranges.
// startKey is included in the results and endKey is excluded. An empty startKey refers to the first available Key
// and an empty endKey refers to the last available Key. For scanning all the keys, both the startKey and the endKey
// can be supplied as empty strings. However, a full scan should be used judiciously for performance reasons.
// The returned ResultsIterator contains results of type *KV which is defined in protos/ledger/queryresult.
GetStateRangeScanIterator(namespace string, startKey string, endKey string) (ledger.ResultsIterator, error)
// Done releases resources occupied by the LedgerReader
Done()
}
LedgerWriter interface, used to read from, and write to, a ledger.
type LedgerWriter interface {
LedgerReader
// SetState sets the given value for the given namespace and key. For a chaincode, the namespace corresponds to the chaincodeId
SetState(namespace string, key string, value []byte) error
}
ResultsIterator - an iterator for query result set
type ResultsIterator interface {
// Next returns the next item in the result set. The `QueryResult` is expected to be nil when
// the iterator gets exhausted
Next() (ledger.QueryResult, error)
// Close releases resources occupied by the iterator
Close()
}