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Merge pull request #50 from ipfs/test-bs
feat: add proxy blockstore for testing against non-saturn backend
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "log" | ||
| "math/rand" | ||
| "net/http" | ||
| "net/url" | ||
| "time" | ||
|
|
||
| "github.com/ipfs/go-cid" | ||
| blockstore "github.com/ipfs/go-ipfs-blockstore" | ||
| "github.com/ipfs/go-libipfs/blocks" | ||
| ) | ||
|
|
||
| // Blockstore backed by a verifiable gateway. This is vendor-agnostic proxy interface, | ||
| // one can use Gateway provided by Kubo, or any other implementation that follows | ||
| // the spec for verifiable responses: | ||
| // https://docs.ipfs.tech/reference/http/gateway/#trustless-verifiable-retrieval | ||
| // https://github.com/ipfs/specs/blob/main/http-gateways/TRUSTLESS_GATEWAY.md | ||
|
|
||
| const ( | ||
| DefaultProxyGateway = "http://127.0.0.1:8080" | ||
| DefaultKuboPRC = "http://127.0.0.1:5001" | ||
| ) | ||
|
|
||
| type proxyBlockStore struct { | ||
| httpClient *http.Client | ||
| gatewayURL []string | ||
| validate bool | ||
| rand *rand.Rand | ||
| } | ||
|
|
||
| func newProxyBlockStore(gatewayURL []string, cdns *cachedDNS) blockstore.Blockstore { | ||
| s := rand.NewSource(time.Now().Unix()) | ||
| rand := rand.New(s) | ||
|
|
||
| if len(gatewayURL) == 0 { | ||
| log.Fatal("Missing PROXY_GATEWAY_URL. See https://github.com/ipfs/bifrost-gateway/blob/main/docs/environment-variables.md") | ||
| } | ||
|
|
||
| return &proxyBlockStore{ | ||
| gatewayURL: gatewayURL, | ||
| httpClient: &http.Client{ | ||
| Timeout: GetBlockTimeout, | ||
| Transport: &withUserAgent{ | ||
| // Roundtripper with increased defaults than http.Transport such that retrieving | ||
| // multiple blocks from a single gateway concurrently is fast. | ||
| RoundTripper: &http.Transport{ | ||
| MaxIdleConns: 1000, | ||
| MaxConnsPerHost: 100, | ||
| MaxIdleConnsPerHost: 100, | ||
| IdleConnTimeout: 90 * time.Second, | ||
| DialContext: cdns.dialWithCachedDNS, | ||
| }, | ||
| }, | ||
| }, | ||
| // Enables block validation by default. Important since we are | ||
| // proxying block requests to an untrusted gateway. | ||
| validate: true, | ||
| rand: rand, | ||
| } | ||
| } | ||
|
|
||
| func (ps *proxyBlockStore) fetch(ctx context.Context, c cid.Cid) (blocks.Block, error) { | ||
| u, err := url.Parse(fmt.Sprintf("%s/ipfs/%s?format=raw", ps.getRandomGatewayURL(), c)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| resp, err := ps.httpClient.Do(&http.Request{ | ||
| Method: http.MethodGet, | ||
| URL: u, | ||
| Header: http.Header{ | ||
| "Accept": []string{"application/vnd.ipld.raw"}, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| return nil, fmt.Errorf("http error from block gateway: %s", resp.Status) | ||
| } | ||
|
|
||
| rb, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if ps.validate { | ||
| nc, err := c.Prefix().Sum(rb) | ||
| if err != nil { | ||
| return nil, blocks.ErrWrongHash | ||
| } | ||
| if !nc.Equals(c) { | ||
| return nil, blocks.ErrWrongHash | ||
| } | ||
| } | ||
|
|
||
| return blocks.NewBlockWithCid(rb, c) | ||
| } | ||
|
|
||
| func (ps *proxyBlockStore) Has(ctx context.Context, c cid.Cid) (bool, error) { | ||
| blk, err := ps.fetch(ctx, c) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| return blk != nil, nil | ||
| } | ||
|
|
||
| func (ps *proxyBlockStore) Get(ctx context.Context, c cid.Cid) (blocks.Block, error) { | ||
| blk, err := ps.fetch(ctx, c) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return blk, nil | ||
| } | ||
|
|
||
| func (ps *proxyBlockStore) GetSize(ctx context.Context, c cid.Cid) (int, error) { | ||
| blk, err := ps.fetch(ctx, c) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| return len(blk.RawData()), nil | ||
| } | ||
|
|
||
| func (ps *proxyBlockStore) HashOnRead(enabled bool) { | ||
| ps.validate = enabled | ||
| } | ||
|
|
||
| func (c *proxyBlockStore) Put(context.Context, blocks.Block) error { | ||
| return errNotImplemented | ||
| } | ||
|
|
||
| func (c *proxyBlockStore) PutMany(context.Context, []blocks.Block) error { | ||
| return errNotImplemented | ||
| } | ||
|
|
||
| func (c *proxyBlockStore) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) { | ||
| return nil, errNotImplemented | ||
| } | ||
|
|
||
| func (c *proxyBlockStore) DeleteBlock(context.Context, cid.Cid) error { | ||
| return errNotImplemented | ||
| } | ||
|
|
||
| func (ps *proxyBlockStore) getRandomGatewayURL() string { | ||
| return ps.gatewayURL[ps.rand.Intn(len(ps.gatewayURL))] | ||
| } | ||
|
|
||
| var _ blockstore.Blockstore = (*proxyBlockStore)(nil) |
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