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[Hack] Add concurrency to cluster creation in resource generator. (ar…
…goproj#11266) * add threading to cluster creation Signed-off-by: Dan Garfield <[email protected]> * Add default values Signed-off-by: Dan Garfield <[email protected]> * Cleanup Signed-off-by: Dan Garfield <[email protected]> * Move external dependency to internal Signed-off-by: Dan Garfield <[email protected]> * ability to run cluster generation in parallel Signed-off-by: pashavictorovich <[email protected]> * fix linter Signed-off-by: pashavictorovich <[email protected]> Signed-off-by: Dan Garfield <[email protected]> Signed-off-by: pashavictorovich <[email protected]> Co-authored-by: pasha-codefresh <[email protected]>
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| // The MIT License (MIT) | ||
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| // Copyright (c) 2018 Rémy Mathieu | ||
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| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
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| // The above copyright notice and this permission notice shall be included in all | ||
| // copies or substantial portions of the Software. | ||
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| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| // SOFTWARE. | ||
| // https://github.com/remeh/sizedwaitgroup | ||
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| // Based upon sync.WaitGroup, SizedWaitGroup allows to start multiple | ||
| // routines and to wait for their end using the simple API. | ||
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| // SizedWaitGroup adds the feature of limiting the maximum number of | ||
| // concurrently started routines. It could for example be used to start | ||
| // multiples routines querying a database but without sending too much | ||
| // queries in order to not overload the given database. | ||
| // | ||
| // Rémy Mathieu © 2016 | ||
| package util | ||
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| import ( | ||
| "context" | ||
| "math" | ||
| "sync" | ||
| ) | ||
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| // SizedWaitGroup has the same role and close to the | ||
| // same API as the Golang sync.WaitGroup but adds a limit of | ||
| // the amount of goroutines started concurrently. | ||
| type SizedWaitGroup struct { | ||
| Size int | ||
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| current chan struct{} | ||
| wg sync.WaitGroup | ||
| } | ||
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| // New creates a SizedWaitGroup. | ||
| // The limit parameter is the maximum amount of | ||
| // goroutines which can be started concurrently. | ||
| func New(limit int) SizedWaitGroup { | ||
| size := math.MaxInt32 // 2^31 - 1 | ||
| if limit > 0 { | ||
| size = limit | ||
| } | ||
| return SizedWaitGroup{ | ||
| Size: size, | ||
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| current: make(chan struct{}, size), | ||
| wg: sync.WaitGroup{}, | ||
| } | ||
| } | ||
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| // Add increments the internal WaitGroup counter. | ||
| // It can be blocking if the limit of spawned goroutines | ||
| // has been reached. It will stop blocking when Done is | ||
| // been called. | ||
| // | ||
| // See sync.WaitGroup documentation for more information. | ||
| func (s *SizedWaitGroup) Add() { | ||
| _ = s.AddWithContext(context.Background()) | ||
| } | ||
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| // AddWithContext increments the internal WaitGroup counter. | ||
| // It can be blocking if the limit of spawned goroutines | ||
| // has been reached. It will stop blocking when Done is | ||
| // been called, or when the context is canceled. Returns nil on | ||
| // success or an error if the context is canceled before the lock | ||
| // is acquired. | ||
| // | ||
| // See sync.WaitGroup documentation for more information. | ||
| func (s *SizedWaitGroup) AddWithContext(ctx context.Context) error { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return ctx.Err() | ||
| case s.current <- struct{}{}: | ||
| break | ||
| } | ||
| s.wg.Add(1) | ||
| return nil | ||
| } | ||
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| // Done decrements the SizedWaitGroup counter. | ||
| // See sync.WaitGroup documentation for more information. | ||
| func (s *SizedWaitGroup) Done() { | ||
| <-s.current | ||
| s.wg.Done() | ||
| } | ||
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| // Wait blocks until the SizedWaitGroup counter is zero. | ||
| // See sync.WaitGroup documentation for more information. | ||
| func (s *SizedWaitGroup) Wait() { | ||
| s.wg.Wait() | ||
| } |