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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package rhp | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "net" | ||
|
|
||
| rhp4 "go.sia.tech/core/rhp/v4" | ||
| "go.sia.tech/core/types" | ||
| rhp "go.sia.tech/coreutils/rhp/v4" | ||
| ) | ||
|
|
||
| var ( | ||
| // errDialTransport is returned when the worker could not dial the host. | ||
| ErrDialTransport = errors.New("could not dial transport") | ||
| ) | ||
|
|
||
| type ( | ||
| Dialer interface { | ||
| Dial(ctx context.Context, hk types.PublicKey, address string) (net.Conn, error) | ||
| } | ||
| ) | ||
|
|
||
| type Client struct { | ||
| tpool *transportPool | ||
| } | ||
|
|
||
| func New(dialer Dialer) *Client { | ||
| return &Client{ | ||
| tpool: newTransportPool(dialer), | ||
| } | ||
| } | ||
|
|
||
| func (c *Client) Settings(ctx context.Context, hk types.PublicKey, addr string) (hs rhp4.HostSettings, _ error) { | ||
| err := c.tpool.withTransport(hk, addr, func(t *transport) error { | ||
| client, err := t.Dial(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| hs, err = rhp.RPCSettings(ctx, client) | ||
| return err | ||
| }) | ||
| return hs, err | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package rhp | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "go.sia.tech/core/types" | ||
| rhp "go.sia.tech/coreutils/rhp/v4" | ||
| ) | ||
|
|
||
| type transportPool struct { | ||
| dialer Dialer | ||
|
|
||
| mu sync.Mutex | ||
| pool map[string]*transport | ||
| } | ||
|
|
||
| func newTransportPool(dialer Dialer) *transportPool { | ||
| return &transportPool{ | ||
| dialer: dialer, | ||
| pool: make(map[string]*transport), | ||
| } | ||
| } | ||
|
|
||
| func (p *transportPool) withTransport(hk types.PublicKey, addr string, fn func(*transport) error) (err error) { | ||
| // fetch or create transport | ||
| p.mu.Lock() | ||
| t, found := p.pool[addr] | ||
| if !found { | ||
| t = &transport{ | ||
| dialer: p.dialer, | ||
| hk: hk, | ||
| addr: addr, | ||
| } | ||
| p.pool[addr] = t | ||
| } | ||
| t.refCount++ | ||
| p.mu.Unlock() | ||
|
|
||
| // execute function | ||
| err = func() (err error) { | ||
| defer func() { | ||
| if r := recover(); r != nil { | ||
| err = fmt.Errorf("panic (withTransport): %v", r) | ||
| } | ||
| }() | ||
| return fn(t) | ||
| }() | ||
|
|
||
| // Decrement refcounter again and clean up pool. | ||
| p.mu.Lock() | ||
| t.refCount-- | ||
| if t.refCount == 0 { | ||
| // Cleanup | ||
| if t.t != nil { | ||
| _ = t.t.Close() | ||
| t.t = nil | ||
| } | ||
| delete(p.pool, addr) | ||
| } | ||
| p.mu.Unlock() | ||
| return err | ||
| } | ||
|
|
||
| // transportPool is a pool of rhpv4.TransportClients which allows for reusing | ||
| // them. | ||
| func dialTransport(ctx context.Context, dialer Dialer, addr string, hk types.PublicKey) (rhp.TransportClient, error) { | ||
| // Dial host. | ||
| conn, err := dialer.Dial(ctx, hk, addr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Upgrade to rhpv4.Transport. | ||
| return rhp.UpgradeConn(ctx, conn, hk) | ||
| } | ||
|
|
||
| type transport struct { | ||
| dialer Dialer | ||
| refCount uint64 // locked by pool | ||
|
|
||
| mu sync.Mutex | ||
| hk types.PublicKey | ||
| addr string | ||
| t rhp.TransportClient | ||
| } | ||
|
|
||
| // DialStream dials a new stream on the transport. | ||
| func (t *transport) Dial(ctx context.Context) (rhp.TransportClient, error) { | ||
| t.mu.Lock() | ||
| defer t.mu.Unlock() | ||
| if t.t == nil { | ||
| start := time.Now() | ||
|
|
||
| // dial host | ||
| conn, err := t.dialer.Dial(ctx, t.hk, t.addr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // upgrade conn | ||
| newTransport, err := rhp.UpgradeConn(ctx, conn, t.hk) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("UpgradeConn: %w: %w (%v)", ErrDialTransport, err, time.Since(start)) | ||
| } | ||
| t.t = newTransport | ||
| } | ||
| return t.t, nil | ||
| } | ||
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