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https://github.com/diamondburned/arikawa.git
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7f4daccd2d
This commit makes it so that all sharded state.State instances will have its own cabinet store on construction. This ensures that when a State is reconnected, a Ready event won't wipe the cabinet for all other states. This commit also fixes a bug with the Shard() and FromGuildID() getters.
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/gateway"
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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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// NewGatewayShardFunc wraps around NewGatewayShard to be compatible with
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// NewShardFunc.
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var NewGatewayShardFunc NewShardFunc = func(m *Manager, id *gateway.Identifier) (Shard, error) {
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return NewGatewayShard(m, id), nil
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}
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// NewGatewayShard creates a new gateway that's plugged into the shard manager.
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func NewGatewayShard(m *Manager, id *gateway.Identifier) *gateway.Gateway {
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gw := gateway.NewCustomIdentifiedGateway(m.GatewayURL(), id)
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gw.OnShardingRequired(m.Rescale)
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return gw
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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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