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operation-get.go
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operation-get.go
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package component
import (
"context"
"errors"
"fmt"
"io"
ipfsFiles "github.com/ipfs/go-ipfs-files"
ipfsPath "github.com/ipfs/interface-go-ipfs-core/path"
"github.com/dapr/components-contrib/bindings"
"github.com/dapr/components-contrib/metadata"
)
// Handler for the "get" operation, which retrieves a document
func (b *IPFSBinding) getOperation(ctx context.Context, req *bindings.InvokeRequest) (*bindings.InvokeResponse, error) {
reqMetadata := &getRequestMetadata{}
err := reqMetadata.FromMap(req.Metadata)
if err != nil {
return nil, err
}
if reqMetadata.Path == "" {
return nil, errors.New("metadata property 'path' is empty")
}
p := ipfsPath.New(reqMetadata.Path)
err = p.IsValid()
if err != nil {
return nil, fmt.Errorf("invalid value for metadata property 'path': %v", err)
}
res, err := b.ipfsAPI.Unixfs().Get(ctx, p)
if err != nil {
return nil, err
}
defer res.Close()
f, ok := res.(ipfsFiles.File)
if !ok {
return nil, errors.New("path does not represent a file")
}
data, err := io.ReadAll(f)
if err != nil {
return nil, err
}
return &bindings.InvokeResponse{
Data: data,
Metadata: nil,
}, nil
}
type getRequestMetadata struct {
Path string `mapstructure:"path"`
}
func (m *getRequestMetadata) FromMap(mp map[string]string) (err error) {
if len(mp) > 0 {
err = metadata.DecodeMetadata(mp, m)
if err != nil {
return err
}
}
return nil
}