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54cadd2f45
This commit refactors the whole package gateway as well as utils/ws
(formerly utils/wsutil) and voice/voicegateway. The new refactor
utilizes a design pattern involving a concurrent loop and an arriving
event channel.
An additional change was made to the way gateway events are typed.
Before, pretty much any type will satisfy a gateway event type, since
the actual type was just interface{}. The new refactor defines a
concrete interface that events can implement:
type Event interface {
Op() OpCode
EventType() EventType
}
Using this interface, the user can easily add custom gateway events
independently of the library without relying on string maps. This adds a
lot of type safety into the library and makes type-switching on Event
types much more reasonable.
Gateway error callbacks are also almost entirely removed in favor of
custom gateway events. A catch-all can easily be added like this:
s.AddHandler(func(err error) {
log.Println("gateway error:, err")
})
86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
package shard
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import (
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"context"
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"github.com/diamondburned/arikawa/v3/api"
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"github.com/diamondburned/arikawa/v3/gateway"
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"github.com/diamondburned/arikawa/v3/session"
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"github.com/diamondburned/arikawa/v3/utils/handler"
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"github.com/pkg/errors"
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)
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// Shard defines a shard gateway interface that the shard manager can use.
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type Shard interface {
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Open(context.Context) error
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Close() error
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}
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// NewShardFunc is the constructor to create a new gateway. For examples, see
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// package session and state's. The constructor must manually connect the
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// Manager's Rescale method appropriately.
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//
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// A new Gateway must not open any background resources until OpenCtx is called;
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// if the gateway has never been opened, its Close method will never be called.
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// During callback, the Manager is not locked, so the callback can use Manager's
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// methods without deadlocking.
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type NewShardFunc func(m *Manager, id *gateway.Identifier) (Shard, error)
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// NewSessionShard creates a shard constructor for a session.
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// Accessing any shard and adding a handler will add a handler for all shards.
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func NewSessionShard(f func(m *Manager, s *session.Session)) NewShardFunc {
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return func(m *Manager, id *gateway.Identifier) (Shard, error) {
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s := session.NewCustom(*id, api.NewClient(id.Token), handler.New())
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f(m, s)
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return s, nil
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}
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}
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// ShardState wraps around the Gateway interface to provide additional state.
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type ShardState struct {
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Shard Shard
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// This is a bit wasteful: 2 constant pointers are stored here, and they
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// waste GC cycles. This is unavoidable, however, since the API has to take
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// in a pointer to Identifier, not IdentifyData. This is to ensure rescales
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// are consistent.
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ID gateway.Identifier
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Opened bool
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}
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// ShardID returns the shard state's shard ID.
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func (state ShardState) ShardID() int {
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return state.ID.Shard.ShardID()
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}
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// OpenShards opens the gateways of the given list of shard states.
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func OpenShards(ctx context.Context, shards []ShardState) error {
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for i, shard := range shards {
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if err := shard.Shard.Open(ctx); err != nil {
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CloseShards(shards)
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return errors.Wrapf(err, "failed to open shard %d/%d", i, len(shards)-1)
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}
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// Mark as opened so we can close them.
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shards[i].Opened = true
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}
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return nil
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}
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// CloseShards closes the gateways of the given list of shard states.
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func CloseShards(shards []ShardState) error {
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var lastError error
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for i, gw := range shards {
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if gw.Opened {
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if err := gw.Shard.Close(); err != nil {
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lastError = err
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}
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shards[i].Opened = false
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}
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}
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return lastError
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}
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