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buffer_types.go
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buffer_types.go
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package buffer
import (
"sync"
"time"
"github.com/idoall/gocryptotrader/currency"
"github.com/idoall/gocryptotrader/exchanges/asset"
"github.com/idoall/gocryptotrader/exchanges/orderbook"
)
// Orderbook defines a local cache of orderbooks for amending, appending
// and deleting changes and updates the main store for a stream
type Orderbook struct {
ob map[currency.Code]map[currency.Code]map[asset.Item]*orderbookHolder
obBufferLimit int
bufferEnabled bool
sortBuffer bool
sortBufferByUpdateIDs bool // When timestamps aren't provided, an id can help sort
updateEntriesByID bool // Use the update IDs to match ob entries
exchangeName string
dataHandler chan interface{}
verbose bool
publishPeriod time.Duration
m sync.Mutex
}
// orderbookHolder defines a store of pending updates and a pointer to the
// orderbook depth
type orderbookHolder struct {
ob *orderbook.Depth
buffer *[]Update
// Reduces the amount of outbound alerts to the data handler for example
// coinbasepro can have up too 100 updates per second introducing overhead.
// The sync agent only requires an alert every 15 seconds for a specific
// currency.
ticker *time.Ticker
}
// Update stores orderbook updates and dictates what features to use when processing
type Update struct {
UpdateID int64 // Used when no time is provided
UpdateTime time.Time
Asset asset.Item
Action
Bids []orderbook.Item
Asks []orderbook.Item
Pair currency.Pair
// Determines if there is a max depth of orderbooks and after an append we
// should remove any items that are outside of this scope. Kraken is the
// only exchange utilising this field.
MaxDepth int
}
// Action defines a set of differing states required to implement an incoming
// orderbook update used in conjunction with UpdateEntriesByID
type Action string
const (
// Amend applies amount adjustment by ID
Amend Action = "update"
// Delete removes price level from book by ID
Delete Action = "delete"
// Insert adds price level to book
Insert Action = "insert"
// UpdateInsert on conflict applies amount adjustment or appends new amount
// to book
UpdateInsert Action = "update/insert"
)