122 lines
3.3 KiB
Go
122 lines
3.3 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package bundler contains functions for concatenation etc. of Resource objects.
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package bundler
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import (
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"errors"
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"fmt"
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"io"
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"path/filepath"
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"github.com/gohugoio/hugo/media"
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"github.com/gohugoio/hugo/resource"
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)
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// Client contains methods perform concatenation and other bundling related
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// tasks to Resource objects.
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type Client struct {
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rs *resource.Spec
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}
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// New creates a new Client with the given specification.
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func New(rs *resource.Spec) *Client {
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return &Client{rs: rs}
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}
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type multiReadSeekCloser struct {
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mr io.Reader
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sources []resource.ReadSeekCloser
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}
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func (r *multiReadSeekCloser) Read(p []byte) (n int, err error) {
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return r.mr.Read(p)
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}
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func (r *multiReadSeekCloser) Seek(offset int64, whence int) (newOffset int64, err error) {
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for _, s := range r.sources {
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newOffset, err = s.Seek(offset, whence)
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if err != nil {
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return
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}
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}
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return
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}
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func (r *multiReadSeekCloser) Close() error {
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for _, s := range r.sources {
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s.Close()
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}
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return nil
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}
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// Concat concatenates the list of Resource objects.
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func (c *Client) Concat(targetPath string, resources []resource.Resource) (resource.Resource, error) {
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// The CACHE_OTHER will make sure this will be re-created and published on rebuilds.
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return c.rs.ResourceCache.GetOrCreate(resource.CACHE_OTHER, targetPath, func() (resource.Resource, error) {
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var resolvedm media.Type
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// The given set of resources must be of the same Media Type.
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// We may improve on that in the future, but then we need to know more.
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for i, r := range resources {
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if i > 0 && r.MediaType() != resolvedm {
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return nil, errors.New("resources in Concat must be of the same Media Type")
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}
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resolvedm = r.MediaType()
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}
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concatr := func() (resource.ReadSeekCloser, error) {
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var rcsources []resource.ReadSeekCloser
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for _, s := range resources {
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rcr, ok := s.(resource.ReadSeekCloserResource)
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if !ok {
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return nil, fmt.Errorf("resource %T does not implement resource.ReadSeekerCloserResource", s)
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}
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rc, err := rcr.ReadSeekCloser()
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if err != nil {
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// Close the already opened.
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for _, rcs := range rcsources {
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rcs.Close()
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}
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return nil, err
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}
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rcsources = append(rcsources, rc)
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}
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readers := make([]io.Reader, len(rcsources))
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for i := 0; i < len(rcsources); i++ {
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readers[i] = rcsources[i]
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}
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mr := io.MultiReader(readers...)
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return &multiReadSeekCloser{mr: mr, sources: rcsources}, nil
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}
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composite, err := c.rs.NewForFs(
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c.rs.BaseFs.Resources.Fs,
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resource.ResourceSourceDescriptor{
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LazyPublish: true,
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OpenReadSeekCloser: concatr,
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RelTargetFilename: filepath.Clean(targetPath)})
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if err != nil {
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return nil, err
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}
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return composite, nil
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})
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}
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