mirror of
https://github.com/ipfs/kubo.git
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92d08db7a5
- updated go-ctxgroup and goprocess ctxgroup: AddChildGroup was changed to AddChild. Used in two files: - p2p/net/mock/mock_net.go - routing/dht/dht.go - updated context from hg repo to git prev. commit in hg was ad01a6fcc8a19d3a4478c836895ffe883bd2ceab. (context: make parentCancelCtx iterative) represents commit 84f8955a887232b6308d79c68b8db44f64df455c in git repo - updated context to master (b6fdb7d8a4ccefede406f8fe0f017fb58265054c) Aaron Jacobs (2): net/context: Don't accept a context in the DoSomethingSlow example. context: Be clear that users must cancel the result of WithCancel. Andrew Gerrand (1): go.net: use golang.org/x/... import paths Bryan C. Mills (1): net/context: Don't leak goroutines in Done example. Damien Neil (1): context: fix removal of cancelled timer contexts from parent David Symonds (2): context: Fix WithValue example code. net: add import comments. Sameer Ajmani (1): context: fix TestAllocs to account for ints in interfaces
69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// package offline implements an object that implements the exchange
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// interface but returns nil values to every request.
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package offline
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import (
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context "github.com/jbenet/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
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blocks "github.com/jbenet/go-ipfs/blocks"
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"github.com/jbenet/go-ipfs/blocks/blockstore"
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exchange "github.com/jbenet/go-ipfs/exchange"
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u "github.com/jbenet/go-ipfs/util"
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)
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func Exchange(bs blockstore.Blockstore) exchange.Interface {
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return &offlineExchange{bs: bs}
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}
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// offlineExchange implements the Exchange interface but doesn't return blocks.
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// For use in offline mode.
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type offlineExchange struct {
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bs blockstore.Blockstore
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}
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// GetBlock returns nil to signal that a block could not be retrieved for the
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// given key.
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// NB: This function may return before the timeout expires.
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func (e *offlineExchange) GetBlock(_ context.Context, k u.Key) (*blocks.Block, error) {
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return e.bs.Get(k)
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}
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// HasBlock always returns nil.
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func (e *offlineExchange) HasBlock(_ context.Context, b *blocks.Block) error {
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return e.bs.Put(b)
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}
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// Close always returns nil.
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func (_ *offlineExchange) Close() error {
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// NB: exchange doesn't own the blockstore's underlying datastore, so it is
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// not responsible for closing it.
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return nil
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}
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func (e *offlineExchange) GetBlocks(ctx context.Context, ks []u.Key) (<-chan *blocks.Block, error) {
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out := make(chan *blocks.Block, 0)
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go func() {
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defer close(out)
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var misses []u.Key
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for _, k := range ks {
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hit, err := e.bs.Get(k)
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if err != nil {
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misses = append(misses, k)
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// a long line of misses should abort when context is cancelled.
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select {
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// TODO case send misses down channel
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case <-ctx.Done():
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return
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default:
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continue
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}
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}
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select {
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case out <- hit:
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case <-ctx.Done():
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return
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}
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}
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}()
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return out, nil
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}
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