117 lines
2.9 KiB
Go
117 lines
2.9 KiB
Go
package getsvc
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import (
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"context"
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"github.com/TrueCloudLab/frostfs-node/pkg/util"
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"github.com/TrueCloudLab/frostfs-sdk-go/object"
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"go.uber.org/zap"
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)
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// Get serves a request to get an object by address, and returns Streamer instance.
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func (s *Service) Get(ctx context.Context, prm Prm) error {
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return s.get(ctx, prm.commonPrm).err
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}
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// GetRange serves a request to get an object by address, and returns Streamer instance.
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func (s *Service) GetRange(ctx context.Context, prm RangePrm) error {
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return s.getRange(ctx, prm)
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}
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func (s *Service) getRange(ctx context.Context, prm RangePrm, opts ...execOption) error {
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return s.get(ctx, prm.commonPrm, append(opts, withPayloadRange(prm.rng))...).err
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}
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func (s *Service) GetRangeHash(ctx context.Context, prm RangeHashPrm) (*RangeHashRes, error) {
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hashes := make([][]byte, 0, len(prm.rngs))
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for _, rng := range prm.rngs {
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h := prm.hashGen()
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// For big ranges we could fetch range-hashes from different nodes and concatenate them locally.
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// However,
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// 1. Potential gains are insignificant when operating in the Internet given typical latencies and losses.
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// 2. Parallel solution is more complex in terms of code.
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// 3. TZ-hash is likely to be disabled in private installations.
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rngPrm := RangePrm{
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commonPrm: prm.commonPrm,
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}
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rngPrm.SetRange(&rng)
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rngPrm.SetChunkWriter(&hasherWrapper{
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hash: util.NewSaltingWriter(h, prm.salt),
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})
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if err := s.getRange(ctx, rngPrm); err != nil {
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return nil, err
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}
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hashes = append(hashes, h.Sum(nil))
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}
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return &RangeHashRes{
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hashes: hashes,
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}, nil
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}
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// Head reads object header from container.
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//
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// Returns ErrNotFound if the header was not received for the call.
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// Returns SplitInfoError if object is virtual and raw flag is set.
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func (s *Service) Head(ctx context.Context, prm HeadPrm) error {
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return s.get(ctx, prm.commonPrm, headOnly()).err
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}
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func (s *Service) get(ctx context.Context, prm commonPrm, opts ...execOption) statusError {
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exec := &execCtx{
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svc: s,
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ctx: ctx,
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prm: RangePrm{
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commonPrm: prm,
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},
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infoSplit: object.NewSplitInfo(),
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}
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for i := range opts {
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opts[i](exec)
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}
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exec.setLogger(s.log)
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exec.execute()
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return exec.statusError
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}
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func (exec *execCtx) execute() {
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exec.log.Debug("serving request...")
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// perform local operation
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exec.executeLocal()
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exec.analyzeStatus(true)
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}
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func (exec *execCtx) analyzeStatus(execCnr bool) {
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// analyze local result
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switch exec.status {
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case statusOK:
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exec.log.Debug("operation finished successfully")
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case statusINHUMED:
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exec.log.Debug("requested object was marked as removed")
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case statusVIRTUAL:
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exec.log.Debug("requested object is virtual")
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exec.assemble()
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case statusOutOfRange:
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exec.log.Debug("requested range is out of object bounds")
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default:
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exec.log.Debug("operation finished with error",
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zap.String("error", exec.err.Error()),
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)
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if execCnr {
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exec.executeOnContainer()
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exec.analyzeStatus(false)
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}
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}
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}
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