87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
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// 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 converter
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import (
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"context"
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"fmt"
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"github.com/drone/drone/core"
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lru "github.com/hashicorp/golang-lru"
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)
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// cache key pattern used in the cache, comprised of the
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// repository slug and commit sha.
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const keyf = "%d/%s"
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// Memoize caches the conversion results for subsequent calls.
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// This micro-optimization is intended for multi-pipeline
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// projects that would otherwise covert the file for each
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// pipeline execution.
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func Memoize(base core.ConvertService) core.ConvertService {
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// simple cache prevents the same yaml file from being
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// requested multiple times in a short period.
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cache, _ := lru.New(25)
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return &memoize{base: base, cache: cache}
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}
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type memoize struct {
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base core.ConvertService
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cache *lru.Cache
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}
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func (c *memoize) Convert(ctx context.Context, req *core.ConvertArgs) (*core.Config, error) {
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// this is a minor optimization that prevents caching if the
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// base converter is a remote converter and is disabled.
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if remote, ok := c.base.(*remote); ok == true && remote.endpoint == "" {
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return nil, nil
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}
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// generate the key used to cache the converted file.
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key := fmt.Sprintf(keyf, req.Repo.ID, req.Build.After)
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// some source control management systems (gogs) do not provide
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// the commit sha for tag webhooks. If no commit sha is available
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// the ref is used.
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if req.Build.After == "" {
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key = fmt.Sprintf(keyf, req.Repo.ID, req.Build.Ref)
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}
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// check the cache for the file and return if exists.
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cached, ok := c.cache.Get(key)
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if ok {
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return cached.(*core.Config), nil
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}
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// else convert the configuration file.
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config, err := c.base.Convert(ctx, req)
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if err != nil {
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return nil, err
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}
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if config == nil {
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return nil, nil
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}
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if config.Data == "" {
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return nil, nil
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}
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// if the configuration file was converted
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// it is temporarily cached.
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c.cache.Add(key, config)
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return config, nil
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}
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