Fitbit/smartling

// Copyright 2016, Fitbit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and limitations under the License.
package service

import (
    "archive/zip"
    "bytes"
    "github.com/Fitbit/smartling/model"
    "github.com/Fitbit/smartling/rest"
    "github.com/google/go-querystring/query"
    "gopkg.in/go-playground/pool.v3"
    "gopkg.in/resty.v0"
    "io/ioutil"
    "net/url"
    "os"
    "path/filepath"
    "strings"
)

type DefaultFileService struct {
    Client *resty.Client `inject:"DefaultRestClient"`
}

func (s *DefaultFileService) Pull(params *FilePullParams) ([]*model.File, error) {
    var (
        q      url.Values
        err    error
        resp   *resty.Response
        _url   string
        reader *zip.Reader
    )

    files := []*model.File{}

    p := pool.New()

    defer p.Close()

    batch := p.Batch()

    if _url, err = rest.GenerateURL(rest.FilePullURL, &params); err == nil {
        if q, err = query.Values(params); err == nil {
            q.Add("fileNameMode", "UNCHANGED")
            q.Add("localeMode", "LOCALE_IN_NAME")

            req := s.Client.R().SetMultiValueQueryParams(q).SetAuthToken(params.AuthToken)

            if resp, err = req.Get(_url); err == nil {
                body := resp.Body()

                go func(params *FilePullParams) {
                    if reader, err = zip.NewReader(bytes.NewReader(body), int64(len(body))); err == nil {
                        for _, file := range reader.File {
                            batch.Queue(s.extractFileWorker(file, params.LocaleIDs))
                        }
                    }

                    batch.QueueComplete()
                }(params)
            }
        }
    }

    for result := range batch.Results() {
        resp := result.Value().(*model.File)

        if err := result.Error(); err == nil {
            files = append(files, resp)
        }
    }

    return files, err
}

func (s *DefaultFileService) Push(params *FilePushParams) (*model.FileStats, error) {
    var (
        q        url.Values
        err      error
        resp     *resty.Response
        _url     string
        filename string
        reader   *os.File
    )

    stats := &model.FileStats{}

    if _url, err = rest.GenerateURL(rest.FilePushURL, &params); err == nil {
        if q, err = query.Values(params); err == nil {
            if filename, err = filepath.Abs(params.FilePath); err == nil {
                if reader, err = os.Open(filename); err == nil {
                    req := s.Client.R().
                        SetResult(rest.Model{}).
                        SetError(rest.Model{}).
                        SetAuthToken(params.AuthToken).
                        SetFileReader("file", "", reader).
                        SetMultiValueFormData(q).
                        SetFormData(params.Directives)

                    if resp, err = req.Post(_url); err == nil {
                        err = rest.Result(resp, &stats)
                    }
                }
            }
        }
    }

    return stats, err
}

func (s *DefaultFileService) extractFile(zf *zip.File, locales []string) (*model.File, error) {
    var err error

    file := &model.File{}

    if rc, err := zf.Open(); err == nil {
        if b, err := ioutil.ReadAll(rc); err == nil {
            for _, locale := range locales {
                name := zf.Name
                localeSuffix := "_" + locale

                if strings.Contains(name, localeSuffix) {
                    file.Path = strings.Replace(name, localeSuffix, "", -1)
                    file.LocaleID = locale
                    break
                }
            }

            file.Content = b
        }

        rc.Close()
    }

    return file, err
}

func (s *DefaultFileService) extractFileWorker(zf *zip.File, locales []string) pool.WorkFunc {
    return func(wu pool.WorkUnit) (interface{}, error) {
        if wu.IsCancelled() {
            return nil, nil
        }

        return s.extractFile(zf, locales)
    }
}