"fmt"
"io"
"log"
+ "net/url"
"os"
+ "runtime"
"sync"
"time"
"crawshaw.io/sqlite/sqlitex"
"github.com/anacrolix/missinggo/iter"
"github.com/anacrolix/missinggo/v2/resource"
+ "github.com/anacrolix/torrent/storage"
)
type conn = *sqlite.Conn
`)
}
-// Emulates a pool from a single Conn.
+// A convenience function that creates a connection pool, resource provider, and a pieces storage
+// ClientImpl and returns them all with a Close attached.
+func NewPiecesStorage(opts NewPoolOpts) (_ storage.ClientImplCloser, err error) {
+ conns, provOpts, err := NewPool(opts)
+ if err != nil {
+ return
+ }
+ prov, err := NewProvider(conns, provOpts)
+ if err != nil {
+ return
+ }
+ store := storage.NewResourcePieces(prov)
+ return struct {
+ storage.ClientImpl
+ io.Closer
+ }{
+ store,
+ conns,
+ }, nil
+}
+
+type NewPoolOpts struct {
+ Path string
+ Memory bool
+ NumConns int
+ // Forces WAL, disables shared caching.
+ ConcurrentBlobReads bool
+}
+
+// There's some overlap here with NewPoolOpts, and I haven't decided what needs to be done. For now,
+// the fact that the pool opts are a superset, means our helper NewPiecesStorage can just take the
+// top-level option type.
+type ProviderOpts struct {
+ NumConns int
+ // Concurrent blob reads require WAL.
+ ConcurrentBlobRead bool
+}
+
+func NewPool(opts NewPoolOpts) (_ ConnPool, _ ProviderOpts, err error) {
+ if opts.NumConns == 0 {
+ opts.NumConns = runtime.NumCPU()
+ }
+ if opts.Memory {
+ opts.Path = ":memory:"
+ }
+ values := make(url.Values)
+ if !opts.ConcurrentBlobReads {
+ values.Add("cache", "shared")
+ }
+ path := fmt.Sprintf("file:%s?%s", opts.Path, values.Encode())
+ conns, err := func() (ConnPool, error) {
+ switch opts.NumConns {
+ case 1:
+ conn, err := sqlite.OpenConn(fmt.Sprintf("file:%s", opts.Path), 0)
+ return &poolFromConn{conn: conn}, err
+ default:
+ return sqlitex.Open(path, 0, opts.NumConns)
+ }
+ }()
+ if err != nil {
+ return
+ }
+ return conns, ProviderOpts{
+ NumConns: opts.NumConns,
+ ConcurrentBlobRead: opts.ConcurrentBlobReads,
+ }, nil
+}
+
+// Emulates a ConnPool from a single Conn. Might be faster than using a sqlitex.Pool.
type poolFromConn struct {
mu sync.Mutex
conn conn
me.mu.Unlock()
}
-func NewProvider(conn *sqlite.Conn) (_ *provider, err error) {
- err = initConn(conn, false)
- if err != nil {
- return
- }
- err = initSchema(conn)
- return &provider{&poolFromConn{conn: conn}}, err
+func (me *poolFromConn) Close() error {
+ return me.conn.Close()
}
-// Needs the pool size so it can initialize all the connections with pragmas.
-func NewProviderPool(pool *sqlitex.Pool, numConns int, wal bool) (_ *provider, err error) {
- _, err = initPoolConns(context.TODO(), pool, numConns, wal)
+// Needs the ConnPool size so it can initialize all the connections with pragmas.
+func NewProvider(pool ConnPool, opts ProviderOpts) (_ *provider, err error) {
+ _, err = initPoolConns(context.TODO(), pool, opts.NumConns, opts.ConcurrentBlobRead)
if err != nil {
return
}
return &provider{pool: pool}, err
}
-func initPoolConns(ctx context.Context, pool *sqlitex.Pool, numConn int, wal bool) (numInited int, err error) {
+func initPoolConns(ctx context.Context, pool ConnPool, numConn int, wal bool) (numInited int, err error) {
var conns []conn
defer func() {
for _, c := range conns {
return
}
-type pool interface {
+type ConnPool interface {
Get(context.Context) conn
Put(conn)
+ Close() error
}
type provider struct {
- pool pool
+ pool ConnPool
}
func (p *provider) NewInstance(s string) (resource.Instance, error) {