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" 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" "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" ) // PrmObjectPutInit groups parameters of ObjectPutInit operation. type PrmObjectPutInit struct { copyNum uint32 } // SetCopiesNumber sets number of object copies that is enough to consider put successful. func (x *PrmObjectPutInit) SetCopiesNumber(copiesNumber uint32) { x.copyNum = copiesNumber } // ResObjectPut groups the final result values of ObjectPutInit operation. type ResObjectPut struct { statusRes obj oid.ID } // StoredObjectID returns identifier of the saved object. func (x ResObjectPut) StoredObjectID() oid.ID { return x.obj } // ObjectWriter is designed to write one object to NeoFS system. // // Must be initialized using Client.ObjectPutInit, any other // usage is unsafe. type ObjectWriter struct { cancelCtxStream context.CancelFunc ctxCall contextCall // initially bound tp contextCall metaHdr v2session.RequestMetaHeader // initially bound to contextCall partInit v2object.PutObjectPartInit chunkCalled bool partChunk v2object.PutObjectPartChunk } // UseKey specifies private key to sign the requests. // If key is not provided, then Client default key is used. func (x *ObjectWriter) UseKey(key ecdsa.PrivateKey) { x.ctxCall.key = key } // WithBearerToken attaches bearer token to be used for the operation. // Should be called once before any writing steps. func (x *ObjectWriter) WithBearerToken(t bearer.Token) { var v2token acl.BearerToken t.WriteToV2(&v2token) x.metaHdr.SetBearerToken(&v2token) } // WithinSession specifies session within which object should be stored. // Should be called once before any writing steps. func (x *ObjectWriter) WithinSession(t session.Object) { var tv2 v2session.Token t.WriteToV2(&tv2) x.metaHdr.SetSessionToken(&tv2) } // MarkLocal tells the server to execute the operation locally. func (x *ObjectWriter) MarkLocal() { x.metaHdr.SetTTL(1) } // WithXHeaders specifies list of extended headers (string key-value pairs) // to be attached to the request. Must have an even length. // // Slice must not be mutated until the operation completes. func (x *ObjectWriter) WithXHeaders(hs ...string) { if len(hs)%2 != 0 { panic("slice of X-Headers with odd length") } prmCommonMeta{xHeaders: hs}.writeToMetaHeader(&x.metaHdr) } // WriteHeader writes header of the object. Result means success. // Failure reason can be received via Close. func (x *ObjectWriter) WriteHeader(hdr object.Object) bool { v2Hdr := hdr.ToV2() x.partInit.SetObjectID(v2Hdr.GetObjectID()) x.partInit.SetHeader(v2Hdr.GetHeader()) x.partInit.SetSignature(v2Hdr.GetSignature()) return x.ctxCall.writeRequest() } // WritePayloadChunk writes chunk of the object payload. Result means success. // Failure reason can be received via Close. func (x *ObjectWriter) WritePayloadChunk(chunk []byte) bool { if !x.chunkCalled { x.chunkCalled = true x.ctxCall.req.(*v2object.PutRequest).GetBody().SetObjectPart(&x.partChunk) } for ln := len(chunk); ln > 0; ln = len(chunk) { // maxChunkLen restricts maximum byte length of the chunk // transmitted in a single stream message. It depends on // server settings and other message fields, but for now // we simply assume that 3MB is large enough to reduce the // number of messages, and not to exceed the limit // (4MB by default for gRPC servers). const maxChunkLen = 3 << 20 if ln > maxChunkLen { ln = maxChunkLen } // we deal with size limit overflow above, but there is another case: // what if method is called with "small" chunk many times? We write // a message to the stream on each call. Alternatively, we could use buffering. // In most cases, the chunk length does not vary between calls. Given this // assumption, as well as the length of the payload from the header, it is // possible to buffer the data of intermediate chunks, and send a message when // the allocated buffer is filled, or when the last chunk is received. // It is mentally assumed that allocating and filling the buffer is better than // synchronous sending, but this needs to be tested. x.partChunk.SetChunk(chunk[:ln]) if !x.ctxCall.writeRequest() { return false } chunk = chunk[ln:] } return true } // Close ends writing the object and returns the result of the operation // along with the final results. Must be called after using the ObjectWriter. // // 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 statuses: // - global (see Client docs); // - *apistatus.ContainerNotFound; // - *apistatus.ObjectAccessDenied; // - *apistatus.ObjectLocked; // - *apistatus.LockNonRegularObject; // - *apistatus.SessionTokenNotFound; // - *apistatus.SessionTokenExpired. func (x *ObjectWriter) Close() (*ResObjectPut, error) { defer x.cancelCtxStream() // Ignore io.EOF error, because it is expected error for client-side // stream termination by the server. E.g. when stream contains invalid // message. Server returns an error in response message (in status). if x.ctxCall.err != nil && !errors.Is(x.ctxCall.err, io.EOF) { return nil, x.ctxCall.err } if x.ctxCall.err = x.ctxCall.closer(); x.ctxCall.err != nil { return nil, x.ctxCall.err } x.ctxCall.processResponse() if x.ctxCall.err != nil { return nil, x.ctxCall.err } if x.ctxCall.result != nil { x.ctxCall.result(x.ctxCall.resp) if x.ctxCall.err != nil { return nil, x.ctxCall.err } } return x.ctxCall.statusRes.(*ResObjectPut), nil } // ObjectPutInit initiates writing an object through a remote server using NeoFS API protocol. // // The call only opens the transmission channel, explicit recording is done using the ObjectWriter. // Exactly one return value is non-nil. Resulting writer must be finally closed. // // Context is required and must not be nil. It is used for network communication. func (c *Client) ObjectPutInit(ctx context.Context, prm PrmObjectPutInit) (*ObjectWriter, error) { // check parameters if ctx == nil { panic(panicMsgMissingContext) } // open stream var ( res ResObjectPut w ObjectWriter resp v2object.PutResponse ) ctx, w.cancelCtxStream = context.WithCancel(ctx) w.partInit.SetCopiesNumber(prm.copyNum) stream, err := rpcapi.PutObject(&c.c, &resp, client.WithContext(ctx)) if err != nil { return nil, fmt.Errorf("open stream: %w", err) } // form request body var body v2object.PutRequestBody // form request var req v2object.PutRequest req.SetBody(&body) req.SetMetaHeader(&w.metaHdr) body.SetObjectPart(&w.partInit) // init call context c.initCallContext(&w.ctxCall) w.ctxCall.req = &req w.ctxCall.statusRes = &res w.ctxCall.resp = &resp w.ctxCall.wReq = func() error { return stream.Write(&req) } w.ctxCall.closer = stream.Close w.ctxCall.result = func(r responseV2) { const fieldID = "ID" idV2 := r.(*v2object.PutResponse).GetBody().GetObjectID() if idV2 == nil { w.ctxCall.err = newErrMissingResponseField(fieldID) return } w.ctxCall.err = res.obj.ReadFromV2(*idV2) if w.ctxCall.err != nil { w.ctxCall.err = newErrInvalidResponseField(fieldID, w.ctxCall.err) } } return &w, nil }