// chainSetup is used to create a new db and chain instance with the genesis
// block already inserted. In addition to the new chain instnce, it returns
// a teardown function the caller should invoke when done testing to clean up.
func chainSetup(dbName string) (*blockchain.BlockChain, func(), error) {
if !isSupportedDbType(testDbType) {
return nil, nil, fmt.Errorf("unsupported db type %v", testDbType)
}
// Handle memory database specially since it doesn't need the disk
// specific handling.
var db database.DB
var teardown func()
if testDbType == "memdb" {
ndb, err := database.Create(testDbType)
if err != nil {
return nil, nil, fmt.Errorf("error creating db: %v", err)
}
db = ndb
// Setup a teardown function for cleaning up. This function is
// returned to the caller to be invoked when it is done testing.
teardown = func() {
db.Close()
}
} else {
// Create the root directory for test databases.
if !fileExists(testDbRoot) {
if err := os.MkdirAll(testDbRoot, 0700); err != nil {
err := fmt.Errorf("unable to create test db "+
"root: %v", err)
return nil, nil, err
}
}
// Create a new database to store the accepted blocks into.
dbPath := filepath.Join(testDbRoot, dbName)
_ = os.RemoveAll(dbPath)
ndb, err := database.Create(testDbType, dbPath, blockDataNet)
if err != nil {
return nil, nil, fmt.Errorf("error creating db: %v", err)
}
db = ndb
// Setup a teardown function for cleaning up. This function is
// returned to the caller to be invoked when it is done testing.
teardown = func() {
db.Close()
os.RemoveAll(dbPath)
os.RemoveAll(testDbRoot)
}
}
// Create the main chain instance.
chain, err := blockchain.New(&blockchain.Config{
DB: db,
ChainParams: &chaincfg.MainNetParams,
})
if err != nil {
teardown()
err := fmt.Errorf("failed to create chain instance: %v", err)
return nil, nil, err
}
return chain, teardown, nil
}
