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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| // Copyright 2024 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package lightclient | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| ) | ||
|
|
||
| type valueAndError[V any] struct { | ||
| value V | ||
| err error | ||
| } | ||
|
|
||
| type objectRequest[V any] struct { | ||
| pending map[chan valueAndError[V]]struct{} | ||
| cancelFn func() | ||
| } | ||
|
|
||
| type requestMap[K comparable, V any] struct { | ||
| lock sync.Mutex | ||
| requests map[K]*objectRequest[V] | ||
| } | ||
|
|
||
| func newRequestMap[K comparable, V any]() *requestMap[K, V] { | ||
| return &requestMap[K, V]{ | ||
| requests: make(map[K]*objectRequest[V]), | ||
| } | ||
| } | ||
|
|
||
| func (r *requestMap[K, V]) add(key K) (chan valueAndError[V], bool) { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
|
|
||
| ch := make(chan valueAndError[V], 1) | ||
| req, ok := r.requests[key] | ||
| if !ok { | ||
| req = &objectRequest[V]{pending: make(map[chan valueAndError[V]]struct{})} | ||
| } | ||
| req.pending[ch] = struct{}{} | ||
| return ch, !ok | ||
| } | ||
|
|
||
| func (r *requestMap[K, V]) has(key K) bool { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
|
|
||
| _, ok := r.requests[key] | ||
| return ok | ||
| } | ||
|
|
||
| func (r *requestMap[K, V]) requestContext(key K) context.Context { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
|
|
||
| ctx, cancelFn := context.WithCancel(context.Background()) | ||
| if req, ok := r.requests[key]; ok { | ||
| req.cancelFn = cancelFn | ||
| } else { | ||
| cancelFn() | ||
| } | ||
| return ctx | ||
| } | ||
|
|
||
| func (r *requestMap[K, V]) deliver(key K, value V, err error) { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
|
|
||
| req, ok := r.requests[key] | ||
| if !ok { | ||
| return | ||
| } | ||
| for ch := range req.pending { | ||
| ch <- valueAndError[V]{value: value, err: err} | ||
| } | ||
| delete(r.requests, key) | ||
| if req.cancelFn != nil { | ||
| req.cancelFn() | ||
| } | ||
| } | ||
|
|
||
| func (r *requestMap[K, V]) remove(key K, ch chan valueAndError[V]) { | ||
| r.lock.Lock() | ||
| defer r.lock.Unlock() | ||
|
|
||
| req, ok := r.requests[key] | ||
| if !ok { | ||
| return | ||
| } | ||
| delete(req.pending, ch) | ||
| if len(req.pending) == 0 { | ||
| delete(r.requests, key) | ||
| if req.cancelFn != nil { | ||
| req.cancelFn() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (r *requestMap[K, V]) waitForValue(ctx context.Context, key K, ch chan valueAndError[V]) (V, error) { | ||
| var empty V | ||
| select { | ||
| case v := <-ch: | ||
| return v.value, v.err | ||
| case <-ctx.Done(): | ||
| r.remove(key, ch) | ||
| return empty, ctx.Err() | ||
| } | ||
| } |