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feat(gateway): improve GO API interface, remove Writable API #145

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merged 2 commits into from
Feb 2, 2023
Merged

feat(gateway): improve GO API interface, remove Writable API #145

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7c44868
feat(gateway): improve API interface, remove Writable API
hacdias Jan 31, 2023
c7cc8b8
refactor: further simplify interface
hacdias Feb 1, 2023
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9 changes: 5 additions & 4 deletions gateway/gateway.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,6 @@ import (
"github.com/ipfs/go-libipfs/blocks"
"github.com/ipfs/go-libipfs/files"
iface "github.com/ipfs/interface-go-ipfs-core"
options "github.com/ipfs/interface-go-ipfs-core/options"
"github.com/ipfs/interface-go-ipfs-core/path"
)

Expand All @@ -21,10 +20,10 @@ type Config struct {
// API defines the minimal set of API services required for a gateway handler.
type API interface {
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@lidel lidel Feb 2, 2023 •
edited

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nit: something like IPFSBackend would be more descriptive, but can be changed later, won't block on this one thing (this interface will most likely get revamp in near future anyway)

// GetUnixFsNode returns a read-only handle to a file tree referenced by a path.
GetUnixFsNode(context.Context, path.Path) (files.Node, error)
GetUnixFsNode(context.Context, path.Resolved) (files.Node, error)

// LsUnixFsDir returns the list of links in a directory.
LsUnixFsDir(context.Context, path.Path, ...options.UnixfsLsOption) (<-chan iface.DirEntry, error)
LsUnixFsDir(context.Context, path.Resolved) (<-chan iface.DirEntry, error)

// GetBlock return a block from a certain CID.
GetBlock(context.Context, cid.Cid) (blocks.Block, error)
Expand All @@ -36,7 +35,9 @@ type API interface {
// IsCached returns whether or not the path exists locally.
IsCached(context.Context, path.Path) bool

// ResolvePath resolves the path using UnixFS resolver
// ResolvePath resolves the path using UnixFS resolver. If the path does not
// exist due to a missing link, it should return an error of type:
// https://pkg.go.dev/github.com/ipfs/go-path@v0.3.0/resolver#ErrNoLink
ResolvePath(context.Context, path.Path) (path.Resolved, error)
}

Expand Down
18 changes: 8 additions & 10 deletions gateway/handler_unixfs_dir.go
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Expand Up @@ -14,7 +14,6 @@ import (
"github.com/ipfs/go-libipfs/gateway/assets"
path "github.com/ipfs/go-path"
"github.com/ipfs/go-path/resolver"
options "github.com/ipfs/interface-go-ipfs-core/options"
ipath "github.com/ipfs/interface-go-ipfs-core/path"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
Expand Down Expand Up @@ -61,9 +60,15 @@ func (i *handler) serveDirectory(ctx context.Context, w http.ResponseWriter, r *

// Check if directory has index.html, if so, serveFile
idxPath := ipath.Join(contentPath, "index.html")
idx, err := i.api.GetUnixFsNode(ctx, idxPath)
idxResolvedPath, err := i.api.ResolvePath(ctx, idxPath)
switch err.(type) {
case nil:
idx, err := i.api.GetUnixFsNode(ctx, idxResolvedPath)
if err != nil {
internalWebError(w, err)
return
}

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I updated the signature of the getter for UnixFS files:

- GetUnixFsNode(context.Context, path.Path) (files.Node, error)
+ GetUnixFsNode(context.Context, path.Resolved) (files.Node, error)

We already have ResolvePath at our disposal. Let's simplify. The change in this code is to reflect that.

f, ok := idx.(files.File)
if !ok {
internalWebError(w, files.ErrNotReader)
Expand Down Expand Up @@ -104,14 +109,7 @@ func (i *handler) serveDirectory(ctx context.Context, w http.ResponseWriter, r *
return
}

// Optimization: use Unixfs.Ls without resolving children, but using the
// cumulative DAG size as the file size. This allows for a fast listing
// while keeping a good enough Size field.
results, err := i.api.LsUnixFsDir(ctx,
resolvedPath,
options.Unixfs.ResolveChildren(false),
options.Unixfs.UseCumulativeSize(true),
)
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Moved this optimization to Kubo's codebase. Each gateway implementation should use whatever they want, some might be faster, some slower. It's the implementers choice. This also allowed me to simplify the API signature to remove the options.

- LsUnixFsDir(context.Context, path.Path, ...options.UnixfsLsOption) (<-chan iface.DirEntry, error)
+ LsUnixFsDir(context.Context, path.Resolved) (<-chan iface.DirEntry, error)

results, err := i.api.LsUnixFsDir(ctx, resolvedPath)
if err != nil {
internalWebError(w, err)
return
Expand Down