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update readme, refactor code for more flexibility, allow configuratio…
…n of the signaling channel
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package channels | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/url" | ||
| "sync" | ||
| ) | ||
|
|
||
| // A Channel facilitates signaling. | ||
| type Channel interface { | ||
| Send(key, data string) error | ||
| Recv(key string) (data string, err error) | ||
| } | ||
|
|
||
| // A Factory returns a Channel from an address | ||
| type Factory = func(addr string) (Channel, error) | ||
|
|
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| var channelFactories = struct { | ||
| sync.Mutex | ||
| m map[string]Factory | ||
| }{ | ||
| m: make(map[string]Factory), | ||
| } | ||
|
|
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| // RegisterFactory registers a new Factory | ||
| func RegisterFactory(scheme string, factory Factory) { | ||
| channelFactories.Lock() | ||
| channelFactories.m[scheme] = factory | ||
| channelFactories.Unlock() | ||
| } | ||
|
|
||
| // Get returns a channel for the given address | ||
| func Get(addr string) (Channel, error) { | ||
| u, err := url.Parse(addr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| channelFactories.Lock() | ||
| factory, ok := channelFactories.m[u.Scheme] | ||
| channelFactories.Unlock() | ||
| if !ok { | ||
| return nil, fmt.Errorf("no channel factory registered for %s", u.Scheme) | ||
| } | ||
|
|
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| return factory(addr) | ||
| } | ||
|
|
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| // Must panics if there's an error | ||
| func Must(ch Channel, err error) Channel { | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return ch | ||
| } |
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