[order,matcher]: Define the Order type and begin matcher.

README.md

@@ -45,7 +45,9 @@ dcrdex
 │   │   ├── admin      # administrative tools and portal (may need RPC server too)
 │   │   └── controller # controller for multiple markets, users, api, comms, etc.
 │   ├── docs
+│   ├── htttpapi       # HTTP API
 │   ├── market         # market manager
+│   │   └── order      # the ubiquitous order type
 │   ├── matcher        # order matching engine
 │   └── swap           # the swap executor/coordinator
 └── spec

server/account/account.go

@@ -0,0 +1,20 @@
+package account
+
+import (
+	"github.com/decred/dcrd/crypto/blake256"
+	"github.com/decred/dcrdex/server/account/pki"
+)
+
+var HashFunc = blake256.Sum256
+
+const (
+	HashSize = blake256.Size
+)
+
+type AccountID [HashSize]byte
+
+func New(pk [pki.PubKeySize]byte) AccountID {
+	// hash the pubkey hash(hash(pubkey))
+	h := HashFunc(pk[:])
+	return HashFunc(h[:])
+}

server/account/go.mod

@@ -0,0 +1,8 @@
+module github.com/decred/dcrdex/server/account
+
+go 1.12
+
+require (
+	github.com/decred/dcrd/crypto/blake256 v1.0.0
+	github.com/decred/dcrd/dcrec/secp256k1 v1.0.2
+)

server/account/go.sum

@@ -0,0 +1,8 @@
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dchest/blake256 v1.0.0/go.mod h1:xXNWCE1jsAP8DAjP+rKw2MbeqLczjI3TRx2VK+9OEYY=
+github.com/decred/dcrd/chaincfg/chainhash v1.0.1/go.mod h1:OVfvaOsNLS/A1y4Eod0Ip/Lf8qga7VXCQjUQLbkY0Go=
+github.com/decred/dcrd/crypto/blake256 v1.0.0 h1:/8DMNYp9SGi5f0w7uCm6d6M4OU2rGFK09Y2A4Xv7EE0=
+github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc=
+github.com/decred/dcrd/dcrec/secp256k1 v1.0.2 h1:awk7sYJ4pGWmtkiGHFfctztJjHMKGLV8jctGQhAbKe0=
+github.com/decred/dcrd/dcrec/secp256k1 v1.0.2/go.mod h1:CHTUIVfmDDd0KFVFpNX1pFVCBUegxW387nN0IGwNKR0=
+github.com/decred/dcrdex v0.0.0-20190820222222-0c633a45b26a h1:IkTp1kie2MKG5zf4nlcVsP9UXPghXUBLa8JB+T538UQ=

server/account/pki/pki.go

@@ -0,0 +1,10 @@
+package pki
+
+import "github.com/decred/dcrd/dcrec/secp256k1"
+
+type PrivateKey = secp256k1.PrivateKey
+
+const (
+	PrivKeySize = secp256k1.PrivKeyBytesLen
+	PubKeySize  = secp256k1.PubKeyBytesLenCompressed
+)

server/market/epoch.go

@@ -0,0 +1,9 @@
+package market
+
+import "github.com/decred/dcrdex/server/market/order"
+
+// TODO. PLACEHOLDER.
+
+type EpochQueue struct {
+	Orders []order.Order
+}

server/market/go.mod

@@ -0,0 +1,10 @@
+module github.com/decred/dcrdex/server/market
+
+go 1.12
+
+replace github.com/decred/dcrdex/server/account => ../account
+
+require (
+	github.com/decred/dcrd/crypto/blake256 v1.0.0
+	github.com/decred/dcrdex/server/account v0.0.0-00010101000000-000000000000
+)

server/market/go.sum

@@ -0,0 +1,9 @@
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dchest/blake256 v1.0.0/go.mod h1:xXNWCE1jsAP8DAjP+rKw2MbeqLczjI3TRx2VK+9OEYY=
+github.com/decred/dcrd v1.3.0 h1:EEXm7BdiROfazDtuFsOu9mfotnyy00bgCuVwUqaszFo=
+github.com/decred/dcrd/chaincfg/chainhash v1.0.1/go.mod h1:OVfvaOsNLS/A1y4Eod0Ip/Lf8qga7VXCQjUQLbkY0Go=
+github.com/decred/dcrd/crypto/blake256 v1.0.0 h1:/8DMNYp9SGi5f0w7uCm6d6M4OU2rGFK09Y2A4Xv7EE0=
+github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc=
+github.com/decred/dcrd/dcrec/secp256k1 v1.0.2 h1:awk7sYJ4pGWmtkiGHFfctztJjHMKGLV8jctGQhAbKe0=
+github.com/decred/dcrd/dcrec/secp256k1 v1.0.2/go.mod h1:CHTUIVfmDDd0KFVFpNX1pFVCBUegxW387nN0IGwNKR0=
+github.com/decred/dcrdex v0.0.0-20190820222222-0c633a45b26a h1:IkTp1kie2MKG5zf4nlcVsP9UXPghXUBLa8JB+T538UQ=

server/market/market.go

@@ -0,0 +1,32 @@
+// This code is available on the terms of the project LICENSE.md file,
+// also available online at https://blueoakcouncil.org/license/1.0.0.
+
+package market
+
+// The Market[Manager] will:
+// - Cycle the epochs. Epoch timing, the current epoch index, etc.
+// - Manage multiple epochs (one active and others in various states of
+//   matching, swapping, or archival).
+// - Receiving and validating new order data (amounts vs. lot size, check fees,
+//   utxos, sufficient market buy buffer, etc. with help from asset backends).
+// - Putting incoming orders into the current epoch queue, which must implement
+//   matcher.Booker so that the order matching engine can work with it.
+// - Possess an order book manager, which must also implement matcher.Booker.
+// - Initiate order matching via matcher.Match(book, currentQueue)
+// - During and/or after matching:
+//     * update the book (remove orders, add new standing orders, etc.)
+//     * retire/archive the epoch queue
+//     * publish the matches (and order book changes?)
+//     * initiate swaps for each match (possibly groups of related matches)
+// - Continually update the order book based on data from the swap executors
+//   (e.g. failed swaps, partial fills?, etc.), communications hub (i.e. dropped
+//   clients), and other sources.
+// - Recording all events with the archivist
+
+// The Market manager should not be overly involved with details of accounts and
+// authentication. Via the account package it should request account status with
+// new orders, verification of order signatures. The Market should also perform
+// various account package callbacks such as order status updates so that the
+// account package code can keep various data up-to-date, including order
+// status, history, cancellation statistics, etc.
+type Market struct{} // TODO

server/market/order/match.go

@@ -0,0 +1,19 @@
+// This code is available on the terms of the project LICENSE.md file,
+// also available online at https://blueoakcouncil.org/license/1.0.0.
+
+package order
+
+// Match represents the result of matching a single Taker order from the epoch
+// queue with one or more standing limit orders from the book, the Makers. The
+// Amounts and Rates of each limit order paired with the taker order are stored.
+// The Rates slice is for convenience as each rate must match with the Maker's
+// rates. However, one of the Amounts may be less than the full quantity of the
+// corresponding limit order, indicating a partial fill of the Maker. The sum of
+// the amounts, Total, is provided for convenience.
+type Match struct {
+	Taker   Order
+	Makers  []*LimitOrder
+	Amounts []uint64
+	Rates   []uint64
+	Total   uint64
+}