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mux.go
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mux.go
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package mux
import (
"fmt"
"io"
"strings"
"ariga.io/atlas/sql/schema"
)
type (
// importProvider - returns an ImportDriver for a given dialect.
importProvider func(string) (*ImportDriver, error)
// Mux is used for routing dsn to correct provider.
Mux struct {
providers map[string]importProvider
}
// ImportDriver implements Inspector interface and holds inspection information.
ImportDriver struct {
io.Closer
schema.Inspector
Dialect string
SchemaName string
}
)
// New returns a new Mux.
func New() *Mux {
return &Mux{
providers: make(map[string]importProvider),
}
}
var Default = New()
// RegisterProvider is used to register an Atlas provider by key.
func (u *Mux) RegisterProvider(p importProvider, scheme ...string) {
for _, s := range scheme {
u.providers[s] = p
}
}
// OpenImport is used for opening an import driver on a specific data source.
func (u *Mux) OpenImport(dsn string) (*ImportDriver, error) {
scheme, host, err := parseDSN(dsn)
if err != nil {
return nil, fmt.Errorf("failed to parse DSN: %v", err)
}
p, ok := u.providers[scheme]
if !ok {
return nil, fmt.Errorf("provider does not exist: %q", scheme)
}
return p(host)
}
func parseDSN(url string) (string, string, error) {
a := strings.SplitN(url, "://", 2)
if len(a) != 2 {
return "", "", fmt.Errorf(`failed to parse dsn: "%s"`, url)
}
return a[0], a[1], nil
}