frostfs-sdk-go/client/object_get.go

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package client
import (
"context"
"crypto/ecdsa"
"errors"
"fmt"
"io"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/acl"
v2object "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
v2refs "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
rpcapi "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
v2session "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/signature"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
)
// PrmObjectGet groups parameters of ObjectGetInit operation.
type PrmObjectGet struct {
XHeaders []string
BearerToken *bearer.Token
Session *session.Object
Raw bool
Local bool
ContainerID *cid.ID
ObjectID *oid.ID
Key *ecdsa.PrivateKey
}
func (prm *PrmObjectGet) buildRequest(c *Client) (*v2object.GetRequest, error) {
if prm.ContainerID == nil {
return nil, errorMissingContainer
}
if prm.ObjectID == nil {
return nil, errorMissingObject
}
if len(prm.XHeaders)%2 != 0 {
return nil, errorInvalidXHeaders
}
meta := new(v2session.RequestMetaHeader)
writeXHeadersToMeta(prm.XHeaders, meta)
if prm.BearerToken != nil {
v2BearerToken := new(acl.BearerToken)
prm.BearerToken.WriteToV2(v2BearerToken)
meta.SetBearerToken(v2BearerToken)
}
if prm.Session != nil {
v2SessionToken := new(v2session.Token)
prm.Session.WriteToV2(v2SessionToken)
meta.SetSessionToken(v2SessionToken)
}
if prm.Local {
meta.SetTTL(1)
}
addr := new(v2refs.Address)
cnrV2 := new(v2refs.ContainerID)
prm.ContainerID.WriteToV2(cnrV2)
addr.SetContainerID(cnrV2)
objV2 := new(v2refs.ObjectID)
prm.ObjectID.WriteToV2(objV2)
addr.SetObjectID(objV2)
body := new(v2object.GetRequestBody)
body.SetRaw(prm.Raw)
body.SetAddress(addr)
req := new(v2object.GetRequest)
req.SetBody(body)
c.prepareRequest(req, meta)
return req, nil
}
// ResObjectGet groups the final result values of ObjectGetInit operation.
type ResObjectGet struct {
statusRes
}
// ObjectReader is designed to read one object from FrostFS system.
//
// Must be initialized using Client.ObjectGetInit, any other
// usage is unsafe.
type ObjectReader struct {
cancelCtxStream context.CancelFunc
client *Client
stream interface {
Read(resp *v2object.GetResponse) error
}
res ResObjectGet
err error
tailPayload []byte
remainingPayloadLen int
}
// UseKey specifies private key to sign the requests.
// If key is not provided, then Client default key is used.
//
// Deprecated: Use PrmObjectGet.Key instead.
func (prm *PrmObjectGet) UseKey(key ecdsa.PrivateKey) {
prm.Key = &key
}
// ReadHeader reads header of the object. Result means success.
// Failure reason can be received via Close.
func (x *ObjectReader) ReadHeader(dst *object.Object) bool {
var resp v2object.GetResponse
x.err = x.stream.Read(&resp)
if x.err != nil {
return false
}
x.res.st, x.err = x.client.processResponse(&resp)
if x.err != nil || !apistatus.IsSuccessful(x.res.st) {
return false
}
var partInit *v2object.GetObjectPartInit
switch v := resp.GetBody().GetObjectPart().(type) {
default:
x.err = fmt.Errorf("unexpected message instead of heading part: %T", v)
return false
case *v2object.SplitInfo:
x.err = object.NewSplitInfoError(object.NewSplitInfoFromV2(v))
return false
case *v2object.ECInfo:
x.err = object.NewECInfoError(object.NewECInfoFromV2(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 chunk []byte
var lastRead int
for {
var resp v2object.GetResponse
x.err = x.stream.Read(&resp)
if x.err != nil {
return read, false
}
x.res.st, x.err = x.client.processResponse(&resp)
if x.err != nil || !apistatus.IsSuccessful(x.res.st) {
return read, false
}
part := resp.GetBody().GetObjectPart()
partChunk, ok := part.(*v2object.GetObjectPartChunk)
if !ok {
x.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.err != nil {
if !errors.Is(x.err, io.EOF) {
return nil, x.err
} else if !ignoreEOF {
if x.remainingPayloadLen > 0 {
return nil, io.ErrUnexpectedEOF
}
return nil, io.EOF
}
}
return &x.res, 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 FrostFS API statuses, then FrostFS 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 FrostFS 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.
//
// Returns an error 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) {
req, err := prm.buildRequest(c)
if err != nil {
return nil, err
}
key := prm.Key
if key == nil {
key = &c.prm.Key
}
err = signature.SignServiceMessage(key, req)
if err != nil {
return nil, fmt.Errorf("sign request: %w", err)
}
ctx, cancel := context.WithCancel(ctx)
stream, err := rpcapi.GetObject(&c.c, req, client.WithContext(ctx))
if err != nil {
cancel()
return nil, fmt.Errorf("open stream: %w", err)
}
var r ObjectReader
r.cancelCtxStream = cancel
r.stream = stream
r.client = c
return &r, nil
}
// PrmObjectHead groups parameters of ObjectHead operation.
type PrmObjectHead struct {
XHeaders []string
BearerToken *bearer.Token
Session *session.Object
Raw bool
Local bool
ContainerID *cid.ID
ObjectID *oid.ID
Key *ecdsa.PrivateKey
}
// UseKey specifies private key to sign the requests.
// If key is not provided, then Client default key is used.
//
// Deprecated: Use PrmObjectHead.Key instead.
func (prm *PrmObjectHead) UseKey(key ecdsa.PrivateKey) {
prm.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
}
func (prm *PrmObjectHead) buildRequest(c *Client) (*v2object.HeadRequest, error) {
if prm.ContainerID == nil {
return nil, errorMissingContainer
}
if prm.ObjectID == nil {
return nil, errorMissingObject
}
if len(prm.XHeaders)%2 != 0 {
return nil, errorInvalidXHeaders
}
meta := new(v2session.RequestMetaHeader)
writeXHeadersToMeta(prm.XHeaders, meta)
if prm.BearerToken != nil {
v2BearerToken := new(acl.BearerToken)
prm.BearerToken.WriteToV2(v2BearerToken)
meta.SetBearerToken(v2BearerToken)
}
if prm.Session != nil {
v2SessionToken := new(v2session.Token)
prm.Session.WriteToV2(v2SessionToken)
meta.SetSessionToken(v2SessionToken)
}
if prm.Local {
meta.SetTTL(1)
}
addr := new(v2refs.Address)
cnrV2 := new(v2refs.ContainerID)
prm.ContainerID.WriteToV2(cnrV2)
addr.SetContainerID(cnrV2)
objV2 := new(v2refs.ObjectID)
prm.ObjectID.WriteToV2(objV2)
addr.SetObjectID(objV2)
body := new(v2object.HeadRequestBody)
body.SetRaw(prm.Raw)
body.SetAddress(addr)
req := new(v2object.HeadRequest)
req.SetBody(body)
c.prepareRequest(req, meta)
return req, nil
}
// ObjectHead reads object header through a remote server using FrostFS 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.DisableFrostFSFailuresResolution has been called, unsuccessful
// FrostFS status codes are included in the returned result structure,
// otherwise, are also returned as `error`.
//
// Returns an error 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) {
req, err := prm.buildRequest(c)
if err != nil {
return nil, err
}
key := c.prm.Key
if prm.Key != nil {
key = *prm.Key
}
// sign the request
err = signature.SignServiceMessage(&key, req)
if err != nil {
return nil, fmt.Errorf("sign request: %w", err)
}
resp, err := rpcapi.HeadObject(&c.c, req, client.WithContext(ctx))
if err != nil {
return nil, fmt.Errorf("write request: %w", err)
}
var res ResObjectHead
res.st, err = c.processResponse(resp)
if err != nil {
return nil, err
}
if !apistatus.IsSuccessful(res.st) {
return &res, nil
}
res.idObj = *prm.ObjectID
switch v := resp.GetBody().GetHeaderPart().(type) {
default:
return nil, fmt.Errorf("unexpected header type %T", v)
case *v2object.SplitInfo:
return nil, object.NewSplitInfoError(object.NewSplitInfoFromV2(v))
case *v2object.ECInfo:
return nil, object.NewECInfoError(object.NewECInfoFromV2(v))
case *v2object.HeaderWithSignature:
res.hdr = v
}
return &res, nil
}
// PrmObjectRange groups parameters of ObjectRange operation.
type PrmObjectRange struct {
XHeaders []string
BearerToken *bearer.Token
Session *session.Object
Raw bool
Local bool
ContainerID *cid.ID
ObjectID *oid.ID
Key *ecdsa.PrivateKey
Offset uint64
Length uint64
}
func (prm *PrmObjectRange) buildRequest(c *Client) (*v2object.GetRangeRequest, error) {
if prm.Length == 0 {
return nil, errorZeroRangeLength
}
if prm.ContainerID == nil {
return nil, errorMissingContainer
}
if prm.ObjectID == nil {
return nil, errorMissingObject
}
if len(prm.XHeaders)%2 != 0 {
return nil, errorInvalidXHeaders
}
meta := new(v2session.RequestMetaHeader)
writeXHeadersToMeta(prm.XHeaders, meta)
if prm.BearerToken != nil {
v2BearerToken := new(acl.BearerToken)
prm.BearerToken.WriteToV2(v2BearerToken)
meta.SetBearerToken(v2BearerToken)
}
if prm.Session != nil {
v2SessionToken := new(v2session.Token)
prm.Session.WriteToV2(v2SessionToken)
meta.SetSessionToken(v2SessionToken)
}
if prm.Local {
meta.SetTTL(1)
}
addr := new(v2refs.Address)
cnrV2 := new(v2refs.ContainerID)
prm.ContainerID.WriteToV2(cnrV2)
addr.SetContainerID(cnrV2)
objV2 := new(v2refs.ObjectID)
prm.ObjectID.WriteToV2(objV2)
addr.SetObjectID(objV2)
rng := new(v2object.Range)
rng.SetLength(prm.Length)
rng.SetOffset(prm.Offset)
body := new(v2object.GetRangeRequestBody)
body.SetRaw(prm.Raw)
body.SetAddress(addr)
body.SetRange(rng)
req := new(v2object.GetRangeRequest)
req.SetBody(body)
c.prepareRequest(req, meta)
return req, nil
}
// UseKey specifies private key to sign the requests.
// If key is not provided, then Client default key is used.
//
// Deprecated: Use PrmObjectRange.Key instead.
func (prm *PrmObjectRange) UseKey(key ecdsa.PrivateKey) {
prm.Key = &key
}
// ResObjectRange groups the final result values of ObjectRange operation.
type ResObjectRange struct {
statusRes
}
// ObjectRangeReader is designed to read payload range of one object
// from FrostFS system.
//
// Must be initialized using Client.ObjectRangeInit, any other
// usage is unsafe.
type ObjectRangeReader struct {
cancelCtxStream context.CancelFunc
client *Client
res ResObjectRange
err error
stream interface {
Read(resp *v2object.GetRangeResponse) error
}
tailPayload []byte
remainingPayloadLen int
}
func (x *ObjectRangeReader) 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 partChunk *v2object.GetRangePartChunk
var chunk []byte
var lastRead int
for {
var resp v2object.GetRangeResponse
x.err = x.stream.Read(&resp)
if x.err != nil {
return read, false
}
x.res.st, x.err = x.client.processResponse(&resp)
if x.err != nil || !apistatus.IsSuccessful(x.res.st) {
return read, false
}
// get chunk message
switch v := resp.GetBody().GetRangePart().(type) {
default:
x.err = fmt.Errorf("unexpected message received: %T", v)
return read, false
case *v2object.SplitInfo:
x.err = object.NewSplitInfoError(object.NewSplitInfoFromV2(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.err != nil {
if !errors.Is(x.err, io.EOF) {
return nil, x.err
} else if !ignoreEOF {
if x.remainingPayloadLen > 0 {
return nil, io.ErrUnexpectedEOF
}
return nil, io.EOF
}
}
return &x.res, 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 FrostFS API statuses, then FrostFS 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 FrostFS 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.
//
// Returns an error 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) {
req, err := prm.buildRequest(c)
if err != nil {
return nil, err
}
key := prm.Key
if key == nil {
key = &c.prm.Key
}
err = signature.SignServiceMessage(key, req)
if err != nil {
return nil, fmt.Errorf("sign request: %w", err)
}
ctx, cancel := context.WithCancel(ctx)
stream, err := rpcapi.GetObjectRange(&c.c, req, client.WithContext(ctx))
if err != nil {
cancel()
return nil, fmt.Errorf("open stream: %w", err)
}
var r ObjectRangeReader
r.remainingPayloadLen = int(prm.Length)
r.cancelCtxStream = cancel
r.stream = stream
r.client = c
return &r, nil
}