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Add a HTTP cache for remote resources.
Fixes gohugoio#12502
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| // Copyright 2024 The Hugo Authors. All rights reserved. | ||
| // | ||
| // 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 tasks | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| // RunEvery runs a function at a regular interval. | ||
| // Functions can be added and removed while running. | ||
| type RunEvery struct { | ||
| // The shortest interval between each run. | ||
| IntervalLow time.Duration | ||
|
|
||
| // The longest interval between each run. | ||
| IntervalHigh time.Duration | ||
|
|
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| // Any error returned from the function will be passed to this function. | ||
| HandleError func(string, error) | ||
|
|
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| // If set, the function will be run immediately. | ||
| RunImmediately bool | ||
|
|
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| // The named functions to run. | ||
| funcs map[string]*fn | ||
|
|
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| mu sync.Mutex | ||
| started bool | ||
| closed bool | ||
| quit chan struct{} | ||
| } | ||
|
|
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| type fn struct { | ||
| interval time.Duration | ||
| last time.Time | ||
| f func(interval time.Duration) (time.Duration, error) | ||
| } | ||
|
|
||
| func (r *RunEvery) Start() error { | ||
| if r.started { | ||
| return nil | ||
| } | ||
| if r.IntervalLow == 0 { | ||
| r.IntervalLow = 1 * time.Second | ||
| } | ||
|
|
||
| if r.IntervalHigh < r.IntervalLow { | ||
| r.IntervalHigh = r.IntervalLow * 30 | ||
| } | ||
|
|
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| r.started = true | ||
| r.quit = make(chan struct{}) | ||
|
|
||
| go func() { | ||
| if r.RunImmediately { | ||
| r.run() | ||
| } | ||
| ticker := time.NewTicker(500 * time.Millisecond) | ||
| defer ticker.Stop() | ||
| for { | ||
| select { | ||
| case <-r.quit: | ||
| return | ||
| case <-ticker.C: | ||
| r.run() | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Close stops the RunEvery from running. | ||
| func (r *RunEvery) Close() error { | ||
| if r.closed { | ||
| return nil | ||
| } | ||
| r.closed = true | ||
| if r.quit != nil { | ||
| close(r.quit) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Add adds a function to the RunEvery. | ||
| func (r *RunEvery) Add(name string, f func(time.Duration) (time.Duration, error)) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| if r.funcs == nil { | ||
| r.funcs = make(map[string]*fn) | ||
| } | ||
| start := r.IntervalHigh / 3 | ||
| if start < r.IntervalLow { | ||
| start = r.IntervalLow | ||
| } | ||
| r.funcs[name] = &fn{f: f, interval: start, last: time.Now()} | ||
| } | ||
|
|
||
| // Remove removes a function from the RunEvery. | ||
| func (r *RunEvery) Remove(name string) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| delete(r.funcs, name) | ||
| } | ||
|
|
||
| // Has returns whether the RunEvery has a function with the given name. | ||
| func (r *RunEvery) Has(name string) bool { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| _, found := r.funcs[name] | ||
| return found | ||
| } | ||
|
|
||
| func (r *RunEvery) run() { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| for name, f := range r.funcs { | ||
| if time.Now().Before(f.last.Add(f.interval)) { | ||
| continue | ||
| } | ||
| f.last = time.Now() | ||
| interval, err := f.f(f.interval) | ||
| if err != nil && r.HandleError != nil { | ||
| r.HandleError(name, err) | ||
| } | ||
|
|
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| if interval < r.IntervalLow { | ||
| interval = r.IntervalLow | ||
| } | ||
|
|
||
| if interval > r.IntervalHigh { | ||
| interval = r.IntervalHigh | ||
| } | ||
|
|
||
| f.interval = interval | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright 2024 The Hugo Authors. All rights reserved. | ||
| // | ||
| // 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 types | ||
|
|
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| import "sync" | ||
|
|
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| type Closer interface { | ||
| Close() error | ||
| } | ||
|
|
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| type CloseAdder interface { | ||
| Add(Closer) | ||
| } | ||
|
|
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| type Closers struct { | ||
| mu sync.Mutex | ||
| cs []Closer | ||
| } | ||
|
|
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| func (cs *Closers) Add(c Closer) { | ||
| cs.mu.Lock() | ||
| defer cs.mu.Unlock() | ||
| cs.cs = append(cs.cs, c) | ||
| } | ||
|
|
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| func (cs *Closers) Close() error { | ||
| cs.mu.Lock() | ||
| defer cs.mu.Unlock() | ||
| for _, c := range cs.cs { | ||
| c.Close() | ||
| } | ||
|
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| cs.cs = cs.cs[:0] | ||
|
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| return nil | ||
| } |
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