package client import ( "context" "crypto/ecdsa" "errors" "fmt" "io" "github.com/nspcc-dev/neofs-api-go/v2/acl" v2object "github.com/nspcc-dev/neofs-api-go/v2/object" v2refs "github.com/nspcc-dev/neofs-api-go/v2/refs" rpcapi "github.com/nspcc-dev/neofs-api-go/v2/rpc" "github.com/nspcc-dev/neofs-api-go/v2/rpc/client" v2session "github.com/nspcc-dev/neofs-api-go/v2/session" "github.com/nspcc-dev/neofs-sdk-go/bearer" apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status" cid "github.com/nspcc-dev/neofs-sdk-go/container/id" "github.com/nspcc-dev/neofs-sdk-go/object" oid "github.com/nspcc-dev/neofs-sdk-go/object/id" "github.com/nspcc-dev/neofs-sdk-go/session" ) // shared parameters of GET/HEAD/RANGE. type prmObjectRead struct { prmCommonMeta raw bool local bool sessionSet bool session session.Object bearerSet bool bearer bearer.Token cnrSet bool cnrID cid.ID objSet bool objID oid.ID } func (x prmObjectRead) writeToMetaHeader(h *v2session.RequestMetaHeader) { if x.local { h.SetTTL(1) } if x.bearerSet { var v2token acl.BearerToken x.bearer.WriteToV2(&v2token) h.SetBearerToken(&v2token) } if x.sessionSet { var tokv2 v2session.Token x.session.WriteToV2(&tokv2) h.SetSessionToken(&tokv2) } x.prmCommonMeta.writeToMetaHeader(h) } // MarkRaw marks an intent to read physically stored object. func (x *prmObjectRead) MarkRaw() { x.raw = true } // MarkLocal tells the server to execute the operation locally. func (x *prmObjectRead) MarkLocal() { x.local = true } // WithinSession specifies session within which object should be read. // // Creator of the session acquires the authorship of the request. // This may affect the execution of an operation (e.g. access control). // // Must be signed. func (x *prmObjectRead) WithinSession(t session.Object) { x.session = t x.sessionSet = true } // WithBearerToken attaches bearer token to be used for the operation. // // If set, underlying eACL rules will be used in access control. // // Must be signed. func (x *prmObjectRead) WithBearerToken(t bearer.Token) { x.bearer = t x.bearerSet = true } // FromContainer specifies NeoFS container of the object. // Required parameter. func (x *prmObjectRead) FromContainer(id cid.ID) { x.cnrID = id x.cnrSet = true } // ByID specifies identifier of the requested object. // Required parameter. func (x *prmObjectRead) ByID(id oid.ID) { x.objID = id x.objSet = true } // PrmObjectGet groups parameters of ObjectGetInit operation. type PrmObjectGet struct { prmObjectRead } // ResObjectGet groups the final result values of ObjectGetInit operation. type ResObjectGet struct { statusRes } // ObjectReader is designed to read one object from NeoFS system. // // Must be initialized using Client.ObjectGetInit, any other // usage is unsafe. type ObjectReader struct { cancelCtxStream context.CancelFunc ctxCall contextCall // initially bound to contextCall bodyResp v2object.GetResponseBody tailPayload []byte remainingPayloadLen int } // UseKey specifies private key to sign the requests. // If key is not provided, then Client default key is used. func (x *ObjectReader) UseKey(key ecdsa.PrivateKey) { x.ctxCall.key = key } func handleSplitInfo(ctx *contextCall, i *v2object.SplitInfo) { ctx.err = object.NewSplitInfoError(object.NewSplitInfoFromV2(i)) } // ReadHeader reads header of the object. Result means success. // Failure reason can be received via Close. func (x *ObjectReader) ReadHeader(dst *object.Object) bool { if !x.ctxCall.writeRequest() || !x.ctxCall.readResponse() { return false } var partInit *v2object.GetObjectPartInit switch v := x.bodyResp.GetObjectPart().(type) { default: x.ctxCall.err = fmt.Errorf("unexpected message instead of heading part: %T", v) return false case *v2object.SplitInfo: handleSplitInfo(&x.ctxCall, v) return false case *v2object.GetObjectPartInit: partInit = v } var objv2 v2object.Object objv2.SetObjectID(partInit.GetObjectID()) objv2.SetHeader(partInit.GetHeader()) objv2.SetSignature(partInit.GetSignature()) x.remainingPayloadLen = int(objv2.GetHeader().GetPayloadLength()) *dst = *object.NewFromV2(&objv2) // need smth better return true } func (x *ObjectReader) readChunk(buf []byte) (int, bool) { var read int // read remaining tail read = copy(buf, x.tailPayload) x.tailPayload = x.tailPayload[read:] if len(buf) == read { return read, true } var ok bool var part v2object.GetObjectPart var chunk []byte var lastRead int for { // receive next message ok = x.ctxCall.readResponse() if !ok { return read, false } // get chunk part message part = x.bodyResp.GetObjectPart() var partChunk *v2object.GetObjectPartChunk partChunk, ok = part.(*v2object.GetObjectPartChunk) if !ok { x.ctxCall.err = fmt.Errorf("unexpected message instead of chunk part: %T", part) return read, false } // read new chunk chunk = partChunk.GetChunk() if len(chunk) == 0 { // just skip empty chunks since they are not prohibited by protocol continue } lastRead = copy(buf[read:], chunk) read += lastRead if read == len(buf) { // save the tail x.tailPayload = append(x.tailPayload, chunk[lastRead:]...) return read, true } } } // ReadChunk reads another chunk of the object payload. Works similar to // io.Reader.Read but returns success flag instead of error. // // Failure reason can be received via Close. func (x *ObjectReader) ReadChunk(buf []byte) (int, bool) { return x.readChunk(buf) } func (x *ObjectReader) close(ignoreEOF bool) (*ResObjectGet, error) { defer x.cancelCtxStream() if x.ctxCall.err != nil { if !errors.Is(x.ctxCall.err, io.EOF) { return nil, x.ctxCall.err } else if !ignoreEOF { if x.remainingPayloadLen > 0 { return nil, io.ErrUnexpectedEOF } return nil, io.EOF } } return x.ctxCall.statusRes.(*ResObjectGet), nil } // Close ends reading the object and returns the result of the operation // along with the final results. Must be called after using the ObjectReader. // // Exactly one return value is non-nil. By default, server status is returned in res structure. // Any client's internal or transport errors are returned as Go built-in error. // If Client is tuned to resolve NeoFS API statuses, then NeoFS failures // codes are returned as error. // // Return errors: // *object.SplitInfoError (returned on virtual objects with PrmObjectGet.MakeRaw). // // Return statuses: // - global (see Client docs); // - *apistatus.ContainerNotFound; // - *apistatus.ObjectNotFound; // - *apistatus.ObjectAccessDenied; // - *apistatus.ObjectAlreadyRemoved; // - *apistatus.SessionTokenExpired. func (x *ObjectReader) Close() (*ResObjectGet, error) { return x.close(true) } // Read implements io.Reader of the object payload. func (x *ObjectReader) Read(p []byte) (int, error) { n, ok := x.readChunk(p) x.remainingPayloadLen -= n if !ok { res, err := x.close(false) if err != nil { return n, err } return n, apistatus.ErrFromStatus(res.Status()) } if x.remainingPayloadLen < 0 { return n, errors.New("payload size overflow") } return n, nil } // ObjectGetInit initiates reading an object through a remote server using NeoFS API protocol. // // The call only opens the transmission channel, explicit fetching is done using the ObjectReader. // Exactly one return value is non-nil. Resulting reader must be finally closed. // // Immediately panics if parameters are set incorrectly (see PrmObjectGet docs). // Context is required and must not be nil. It is used for network communication. func (c *Client) ObjectGetInit(ctx context.Context, prm PrmObjectGet) (*ObjectReader, error) { // check parameters switch { case ctx == nil: panic(panicMsgMissingContext) case !prm.cnrSet: panic(panicMsgMissingContainer) case !prm.objSet: panic("missing object") } var ( addr v2refs.Address oidV2 v2refs.ObjectID cidV2 v2refs.ContainerID ) prm.objID.WriteToV2(&oidV2) prm.cnrID.WriteToV2(&cidV2) addr.SetContainerID(&cidV2) addr.SetObjectID(&oidV2) // form request body var body v2object.GetRequestBody body.SetRaw(prm.raw) body.SetAddress(&addr) // form meta header var meta v2session.RequestMetaHeader prm.prmObjectRead.writeToMetaHeader(&meta) // form request var req v2object.GetRequest req.SetBody(&body) req.SetMetaHeader(&meta) // init reader var ( r ObjectReader resp v2object.GetResponse stream *rpcapi.GetResponseReader ) ctx, r.cancelCtxStream = context.WithCancel(ctx) resp.SetBody(&r.bodyResp) // init call context c.initCallContext(&r.ctxCall) r.ctxCall.req = &req r.ctxCall.statusRes = new(ResObjectGet) r.ctxCall.resp = &resp r.ctxCall.wReq = func() error { var err error stream, err = rpcapi.GetObject(&c.c, &req, client.WithContext(ctx)) if err != nil { return fmt.Errorf("open stream: %w", err) } return nil } r.ctxCall.rResp = func() error { return stream.Read(&resp) } return &r, nil } // PrmObjectHead groups parameters of ObjectHead operation. type PrmObjectHead struct { prmObjectRead keySet bool key ecdsa.PrivateKey } // UseKey specifies private key to sign the requests. // If key is not provided, then Client default key is used. func (x *PrmObjectHead) UseKey(key ecdsa.PrivateKey) { x.keySet = true x.key = key } // ResObjectHead groups resulting values of ObjectHead operation. type ResObjectHead struct { statusRes // requested object (response doesn't carry the ID) idObj oid.ID hdr *v2object.HeaderWithSignature } // ReadHeader reads header of the requested object. // Returns false if header is missing in the response (not read). func (x *ResObjectHead) ReadHeader(dst *object.Object) bool { if x.hdr == nil { return false } var objv2 v2object.Object objv2.SetHeader(x.hdr.GetHeader()) objv2.SetSignature(x.hdr.GetSignature()) obj := object.NewFromV2(&objv2) obj.SetID(x.idObj) *dst = *obj return true } // ObjectHead reads object header through a remote server using NeoFS API protocol. // // Exactly one return value is non-nil. By default, server status is returned in res structure. // Any client's internal or transport errors are returned as `error`, // If PrmInit.ResolveNeoFSFailures has been called, unsuccessful // NeoFS status codes are returned as `error`, otherwise, are included // in the returned result structure. // // Immediately panics if parameters are set incorrectly (see PrmObjectHead docs). // Context is required and must not be nil. It is used for network communication. // // Return errors: // *object.SplitInfoError (returned on virtual objects with PrmObjectHead.MakeRaw). // // Return statuses: // - global (see Client docs); // - *apistatus.ContainerNotFound; // - *apistatus.ObjectNotFound; // - *apistatus.ObjectAccessDenied; // - *apistatus.ObjectAlreadyRemoved; // - *apistatus.SessionTokenExpired. func (c *Client) ObjectHead(ctx context.Context, prm PrmObjectHead) (*ResObjectHead, error) { switch { case ctx == nil: panic(panicMsgMissingContext) case !prm.cnrSet: panic(panicMsgMissingContainer) case !prm.objSet: panic("missing object") } var ( addrV2 v2refs.Address oidV2 v2refs.ObjectID cidV2 v2refs.ContainerID ) prm.objID.WriteToV2(&oidV2) prm.cnrID.WriteToV2(&cidV2) addrV2.SetContainerID(&cidV2) addrV2.SetObjectID(&oidV2) // form request body var body v2object.HeadRequestBody body.SetRaw(prm.raw) body.SetAddress(&addrV2) // form meta header var meta v2session.RequestMetaHeader prm.prmObjectRead.writeToMetaHeader(&meta) // form request var req v2object.HeadRequest req.SetBody(&body) req.SetMetaHeader(&meta) // init call context var ( cc contextCall res ResObjectHead ) res.idObj = prm.objID if prm.keySet { c.initCallContextWithoutKey(&cc) cc.key = prm.key } else { c.initCallContext(&cc) } cc.req = &req cc.statusRes = &res cc.call = func() (responseV2, error) { return rpcapi.HeadObject(&c.c, &req, client.WithContext(ctx)) } cc.result = func(r responseV2) { switch v := r.(*v2object.HeadResponse).GetBody().GetHeaderPart().(type) { default: cc.err = fmt.Errorf("unexpected header type %T", v) case *v2object.SplitInfo: handleSplitInfo(&cc, v) case *v2object.HeaderWithSignature: res.hdr = v } } // process call if !cc.processCall() { return nil, cc.err } return &res, nil } // PrmObjectRange groups parameters of ObjectRange operation. type PrmObjectRange struct { prmObjectRead off, ln uint64 } // SetOffset sets offset of the payload range to be read. // Zero by default. func (x *PrmObjectRange) SetOffset(off uint64) { x.off = off } // SetLength sets length of the payload range to be read. // Must be positive. func (x *PrmObjectRange) SetLength(ln uint64) { x.ln = ln } // ResObjectRange groups the final result values of ObjectRange operation. type ResObjectRange struct { statusRes } // ObjectRangeReader is designed to read payload range of one object // from NeoFS system. // // Must be initialized using Client.ObjectRangeInit, any other // usage is unsafe. type ObjectRangeReader struct { cancelCtxStream context.CancelFunc ctxCall contextCall reqWritten bool // initially bound to contextCall bodyResp v2object.GetRangeResponseBody tailPayload []byte remainingPayloadLen int } // UseKey specifies private key to sign the requests. // If key is not provided, then Client default key is used. func (x *ObjectRangeReader) UseKey(key ecdsa.PrivateKey) { x.ctxCall.key = key } func (x *ObjectRangeReader) readChunk(buf []byte) (int, bool) { if !x.reqWritten { if !x.ctxCall.writeRequest() { return 0, false } x.reqWritten = true } var read int // read remaining tail read = copy(buf, x.tailPayload) x.tailPayload = x.tailPayload[read:] if len(buf) == read { return read, true } var ok bool var partChunk *v2object.GetRangePartChunk var chunk []byte var lastRead int for { // receive next message ok = x.ctxCall.readResponse() if !ok { return read, false } // get chunk message switch v := x.bodyResp.GetRangePart().(type) { default: x.ctxCall.err = fmt.Errorf("unexpected message received: %T", v) return read, false case *v2object.SplitInfo: handleSplitInfo(&x.ctxCall, v) return read, false case *v2object.GetRangePartChunk: partChunk = v } chunk = partChunk.GetChunk() if len(chunk) == 0 { // just skip empty chunks since they are not prohibited by protocol continue } lastRead = copy(buf[read:], chunk) read += lastRead if read == len(buf) { // save the tail x.tailPayload = append(x.tailPayload, chunk[lastRead:]...) return read, true } } } // ReadChunk reads another chunk of the object payload range. // Works similar to io.Reader.Read but returns success flag instead of error. // // Failure reason can be received via Close. func (x *ObjectRangeReader) ReadChunk(buf []byte) (int, bool) { return x.readChunk(buf) } func (x *ObjectRangeReader) close(ignoreEOF bool) (*ResObjectRange, error) { defer x.cancelCtxStream() if x.ctxCall.err != nil { if !errors.Is(x.ctxCall.err, io.EOF) { return nil, x.ctxCall.err } else if !ignoreEOF { if x.remainingPayloadLen > 0 { return nil, io.ErrUnexpectedEOF } return nil, io.EOF } } return x.ctxCall.statusRes.(*ResObjectRange), nil } // Close ends reading the payload range and returns the result of the operation // along with the final results. Must be called after using the ObjectRangeReader. // // Exactly one return value is non-nil. By default, server status is returned in res structure. // Any client's internal or transport errors are returned as Go built-in error. // If Client is tuned to resolve NeoFS API statuses, then NeoFS failures // codes are returned as error. // // Return errors: // *object.SplitInfoError (returned on virtual objects with PrmObjectRange.MakeRaw). // // Return statuses: // - global (see Client docs); // - *apistatus.ContainerNotFound; // - *apistatus.ObjectNotFound; // - *apistatus.ObjectAccessDenied; // - *apistatus.ObjectAlreadyRemoved; // - *apistatus.ObjectOutOfRange; // - *apistatus.SessionTokenExpired. func (x *ObjectRangeReader) Close() (*ResObjectRange, error) { return x.close(true) } // Read implements io.Reader of the object payload. func (x *ObjectRangeReader) Read(p []byte) (int, error) { n, ok := x.readChunk(p) x.remainingPayloadLen -= n if !ok { res, err := x.close(false) if err != nil { return n, err } return n, apistatus.ErrFromStatus(res.Status()) } if x.remainingPayloadLen < 0 { return n, errors.New("payload range size overflow") } return n, nil } // ObjectRangeInit initiates reading an object's payload range through a remote // server using NeoFS API protocol. // // The call only opens the transmission channel, explicit fetching is done using the ObjectRangeReader. // Exactly one return value is non-nil. Resulting reader must be finally closed. // // Immediately panics if parameters are set incorrectly (see PrmObjectRange docs). // Context is required and must not be nil. It is used for network communication. func (c *Client) ObjectRangeInit(ctx context.Context, prm PrmObjectRange) (*ObjectRangeReader, error) { // check parameters switch { case ctx == nil: panic(panicMsgMissingContext) case !prm.cnrSet: panic(panicMsgMissingContainer) case !prm.objSet: panic("missing object") case prm.ln == 0: panic("zero range length") } var ( addrV2 v2refs.Address oidV2 v2refs.ObjectID cidV2 v2refs.ContainerID ) prm.objID.WriteToV2(&oidV2) prm.cnrID.WriteToV2(&cidV2) addrV2.SetContainerID(&cidV2) addrV2.SetObjectID(&oidV2) var rng v2object.Range rng.SetOffset(prm.off) rng.SetLength(prm.ln) // form request body var body v2object.GetRangeRequestBody body.SetRaw(prm.raw) body.SetAddress(&addrV2) body.SetRange(&rng) // form meta header var meta v2session.RequestMetaHeader prm.prmObjectRead.writeToMetaHeader(&meta) // form request var req v2object.GetRangeRequest req.SetBody(&body) req.SetMetaHeader(&meta) // init reader var ( r ObjectRangeReader resp v2object.GetRangeResponse stream *rpcapi.ObjectRangeResponseReader ) r.remainingPayloadLen = int(prm.ln) ctx, r.cancelCtxStream = context.WithCancel(ctx) resp.SetBody(&r.bodyResp) // init call context c.initCallContext(&r.ctxCall) r.ctxCall.req = &req r.ctxCall.statusRes = new(ResObjectRange) r.ctxCall.resp = &resp r.ctxCall.wReq = func() error { var err error stream, err = rpcapi.GetObjectRange(&c.c, &req, client.WithContext(ctx)) if err != nil { return fmt.Errorf("open stream: %w", err) } return nil } r.ctxCall.rResp = func() error { return stream.Read(&resp) } return &r, nil }