100 lines
2.9 KiB
Go
100 lines
2.9 KiB
Go
// Copyright 2019 Drone IO, Inc.
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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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//
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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 contents
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import (
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"context"
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"strings"
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"time"
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"github.com/drone/drone/core"
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"github.com/drone/go-scm/scm"
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)
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// default number of backoff attempts.
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var attempts = 3
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// default time to wait after failed attempt.
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var wait = time.Second * 15
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// New returns a new FileService.
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func New(client *scm.Client, renewer core.Renewer) core.FileService {
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return &service{
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client: client,
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renewer: renewer,
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attempts: attempts,
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wait: wait,
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}
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}
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type service struct {
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renewer core.Renewer
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client *scm.Client
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attempts int
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wait time.Duration
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}
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func (s *service) Find(ctx context.Context, user *core.User, repo, commit, ref, path string) (*core.File, error) {
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// TODO(gogs) ability to fetch a yaml by pull request ref.
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// it is not currently possible to fetch the yaml
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// configuration file from a pull request sha. This
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// workaround defaults to master.
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if s.client.Driver == scm.DriverGogs &&
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strings.HasPrefix(ref, "refs/pull") {
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commit = "master"
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}
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// TODO(gogs) ability to fetch a file in tag from commit sha.
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// this is a workaround for gogs which does not allow
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// fetching a file by commit sha for a tag. This forces
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// fetching a file by reference instead.
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if s.client.Driver == scm.DriverGogs &&
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strings.HasPrefix(ref, "refs/tag") {
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commit = ref
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}
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err := s.renewer.Renew(ctx, user, false)
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if err != nil {
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return nil, err
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}
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ctx = context.WithValue(ctx, scm.TokenKey{}, &scm.Token{
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Token: user.Token,
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Refresh: user.Refresh,
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})
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content, err := s.findRetry(ctx, repo, path, commit)
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if err != nil {
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return nil, err
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}
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return &core.File{
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Data: content.Data,
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Hash: []byte{},
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}, nil
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}
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// helper function attempts to get the yaml configuration file
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// with backoff on failure. This may be required due to eventual
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// consistency issues with the github datastore.
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func (s *service) findRetry(ctx context.Context, repo, path, commit string) (content *scm.Content, err error) {
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for i := 0; i < s.attempts; i++ {
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content, _, err = s.client.Contents.Find(ctx, repo, path, commit)
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// if no error is returned we can exit immediately.
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if err == nil {
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return
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}
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// wait a few seconds before retry. according to github
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// support 30 seconds total should be enough time. we
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// try 3 x 15 seconds, giving a total of 45 seconds.
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time.Sleep(s.wait)
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}
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return
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}
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