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fs.go
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fs.go
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package reader
import (
"compress/bzip2"
"context"
"fmt"
"github.com/whosonfirst/go-ioutil"
"io"
"net/url"
"os"
"path/filepath"
"strconv"
)
// FileReader is a struct that implements the `Reader` interface for reading documents from files on a local disk.
type FileReader struct {
Reader
root string
allow_bz2 bool
}
func init() {
ctx := context.Background()
err := RegisterReader(ctx, "fs", NewFileReader) // Deprecated
if err != nil {
panic(err)
}
}
// NewFileReader returns a new `FileReader` instance for reading documents from local files on
// disk, configured by 'uri' in the form of:
//
// fs://{PATH}
//
// Where {PATH} is an absolute path to an existing directory where files will be read from.
func NewFileReader(ctx context.Context, uri string) (Reader, error) {
u, err := url.Parse(uri)
if err != nil {
return nil, fmt.Errorf("Failed to parse URI, %w", err)
}
root := u.Path
info, err := os.Stat(root)
if err != nil {
return nil, fmt.Errorf("Failed to stat %s, %w", root, err)
}
if !info.IsDir() {
return nil, fmt.Errorf("Root (%s) is not a directory", root)
}
r := &FileReader{
root: root,
}
q := u.Query()
allow_bz2 := q.Get("allow_bz2")
if allow_bz2 != "" {
allow, err := strconv.ParseBool(allow_bz2)
if err != nil {
return nil, fmt.Errorf("Unable to parse '%s' parameter, %w", allow_bz2, err)
}
r.allow_bz2 = allow
}
return r, nil
}
// Read will open an `io.ReadSeekCloser` for a file matching 'path'.
func (r *FileReader) Read(ctx context.Context, path string) (io.ReadSeekCloser, error) {
abs_path := r.ReaderURI(ctx, path)
_, err := os.Stat(abs_path)
if err != nil {
return nil, fmt.Errorf("Failed to stat %s, %v", abs_path, err)
}
var fh io.ReadSeekCloser
fh, err = os.Open(abs_path)
if err != nil {
return nil, fmt.Errorf("Failed to open %s, %w", abs_path, err)
}
if filepath.Ext(abs_path) == ".bz2" && r.allow_bz2 {
bz_r := bzip2.NewReader(fh)
rsc, err := ioutil.NewReadSeekCloser(bz_r)
if err != nil {
return nil, fmt.Errorf("Failed create ReadSeekCloser for bzip2 reader for %s, %w", path, err)
}
fh = rsc
}
return fh, nil
}
// ReaderURI returns the absolute URL for 'path'.
func (r *FileReader) ReaderURI(ctx context.Context, path string) string {
return filepath.Join(r.root, path)
}