wallet: Start the wallet interface and link it into lightningd

The database is hidden behind the wallet interface, which has all the
wallet specific functionality. First up is the tracking of outputs.

lightningd/Makefile

@@ -95,7 +95,8 @@ LIGHTNINGD_HEADERS_NOGEN =			\
 	$(BITCOIN_HEADERS)			\
 	$(CORE_HEADERS)				\
 	$(CORE_TX_HEADERS)			\
-	$(DAEMON_HEADERS)
+	$(DAEMON_HEADERS)			\
+	$(WALLET_LIB_HEADERS)
 
 # Generated headers
 LIGHTNINGD_HEADERS_GEN =			\
@@ -138,7 +139,7 @@ check-makefile: check-lightningd-makefile
 check-lightningd-makefile:
 	@for f in lightningd/*.h lightningd/*/*.h; do if ! echo $(LIGHTNINGD_HEADERS_NOGEN) $(LIGHTNINGD_HEADERS_GEN) "" | grep -q "$$f "; then echo $$f not mentioned in LIGHTNINGD_HEADERS_NOGEN or LIGHTNINGD_HEADERS_GEN >&2; exit 1; fi; done
 
-lightningd/lightningd: $(LIGHTNINGD_OBJS) $(LIGHTNINGD_OLD_OBJS) $(LIGHTNINGD_OLD_LIB_OBJS) $(LIGHTNINGD_LIB_OBJS) $(LIGHTNINGD_JSMN_OBJS) $(CORE_OBJS) $(CORE_TX_OBJS) $(BITCOIN_OBJS) $(WIRE_OBJS) $(WIRE_ONION_OBJS) $(CCAN_OBJS) $(CCAN_SHACHAIN48_OBJ) $(LIGHTNINGD_HSM_CONTROL_OBJS) $(LIGHTNINGD_HANDSHAKE_CONTROL_OBJS) $(LIGHTNINGD_GOSSIP_CONTROL_OBJS) $(LIBBASE58_OBJS) $(LIGHTNINGD_OPENING_CONTROL_OBJS) $(LIGHTNINGD_CHANNEL_CONTROL_OBJS) libsecp256k1.a libsodium.a libwallycore.a
+lightningd/lightningd: $(LIGHTNINGD_OBJS) $(LIGHTNINGD_OLD_OBJS) $(LIGHTNINGD_OLD_LIB_OBJS) $(LIGHTNINGD_LIB_OBJS) $(LIGHTNINGD_JSMN_OBJS) $(CORE_OBJS) $(CORE_TX_OBJS) $(BITCOIN_OBJS) $(WIRE_OBJS) $(WIRE_ONION_OBJS) $(CCAN_OBJS) $(CCAN_SHACHAIN48_OBJ) $(LIGHTNINGD_HSM_CONTROL_OBJS) $(LIGHTNINGD_HANDSHAKE_CONTROL_OBJS) $(LIGHTNINGD_GOSSIP_CONTROL_OBJS) $(LIBBASE58_OBJS) $(LIGHTNINGD_OPENING_CONTROL_OBJS) $(LIGHTNINGD_CHANNEL_CONTROL_OBJS) $(WALLET_LIB_OBJS) libsecp256k1.a libsodium.a libwallycore.a
 
 clean: lightningd-clean
 

lightningd/lightningd.c

@@ -254,6 +254,9 @@ int main(int argc, char *argv[])
 	/* Make sure we can reach other daemons, and versions match. */
 	test_daemons(ld);
 
+	/* Initialize wallet, now that we are in the correct directory */
+	ld->wallet = wallet_new(ld, ld->log);
+
 	/* Mark ourselves live. */
 	log_info(ld->log, "Hello world from %s!", version());
 

lightningd/lightningd.h

@@ -5,6 +5,7 @@
 #include <ccan/container_of/container_of.h>
 #include <daemon/lightningd.h>
 #include <lightningd/htlc_end.h>
+#include <wallet/wallet.h>
 
 /* BOLT #1:
  *
@@ -60,6 +61,8 @@ struct lightningd {
 	struct htlc_end_map htlc_ends;
 
 	u32 broadcast_interval;
+
+	struct wallet *wallet;
 };
 
 void derive_peer_seed(struct lightningd *ld, struct privkey *peer_seed,

wallet/Makefile

@@ -7,7 +7,8 @@ wallet-wrongdir:
 check: wallet/tests
 
 WALLET_LIB_SRC :=	\
-	wallet/db.c
+	wallet/db.c	\
+	wallet/wallet.c
 
 WALLET_LIB_OBJS := $(WALLET_LIB_SRC:.c=.o)
 WALLET_LIB_HEADERS := $(WALLET_LIB_SRC:.c=.h)

wallet/db.c

@@ -14,7 +14,7 @@ char *dbmigrations[] = {
     "CREATE TABLE version (version INTEGER)",
     "INSERT INTO version VALUES (1)",
     "CREATE TABLE outputs ( \
-       prev_out_tx BLOB,			 \
+       prev_out_tx CHAR(64),			 \
        prev_out_index INTEGER,			 \
        value INTEGER,				 \
        type INTEGER,				 \

wallet/wallet.c

@@ -0,0 +1,27 @@
+#include "wallet.h"
+
+struct wallet *wallet_new(const tal_t *ctx, struct log *log)
+{
+	struct wallet *wallet = tal(ctx, struct wallet);
+	wallet->db = db_setup(wallet);
+	wallet->log = log;
+	if (!wallet->db) {
+		fatal("Unable to setup the wallet database");
+	}
+	return wallet;
+}
+
+bool wallet_add_utxo(struct wallet *w, struct utxo *utxo,
+		     enum wallet_output_type type)
+{
+	tal_t *tmpctx = tal_tmpctx(w);
+	char *hextxid = tal_hexstr(tmpctx, &utxo->txid, 32);
+	bool result = db_exec(
+	    __func__, w->db,
+	    "INSERT INTO outputs (prev_out_tx, prev_out_index, value, type, "
+	    "status, keyindex) VALUES ('%s', %d, %zu, %d, %d, %d);",
+	    hextxid, utxo->outnum, utxo->amount, type, output_state_available,
+	    utxo->keyindex);
+	tal_free(tmpctx);
+	return result;
+}

wallet/wallet.h

@@ -0,0 +1,53 @@
+#ifndef WALLET_WALLET_H
+#define WALLET_WALLET_H
+
+#include "config.h"
+#include "db.h"
+#include <ccan/tal/tal.h>
+#include <lightningd/utxo.h>
+
+struct wallet {
+	struct db *db;
+	struct log *log;
+};
+
+/* Possible states for tracked outputs in the database. Not sure yet
+ * whether we really want to have reservations reflected in the
+ * database, it would simplify queries at the cost of some IO ops */
+enum output_status {
+	output_state_available= 0,
+	output_state_reserved = 1,
+	output_state_spent = 2,
+	/* Special status used to express that we don't care in
+	 * queries */
+	output_state_any = 255
+};
+
+/* Enumeration of all known output types. These include all types that
+ * could ever end up on-chain and we may need to react upon. Notice
+ * that `to_local`, `htlc_offer`, and `htlc_recv` may need immediate
+ * action since they are encumbered with a CSV. */
+enum wallet_output_type {
+	p2sh_wpkh = 0,
+	to_local = 1,
+	htlc_offer = 3,
+	htlc_recv = 4
+};
+
+/**
+ * wallet_new - Constructor for a new sqlite3 based wallet
+ *
+ * This is guaranteed to either return a valid wallet, or abort with
+ * `fatal` if it cannot be initialized.
+ */
+struct wallet *wallet_new(const tal_t *ctx, struct log *log);
+
+/**
+ * wallet_add_utxo - Register a UTXO which we (partially) own
+ *
+ * Add a UTXO to the set of outputs we care about.
+ */
+bool wallet_add_utxo(struct wallet *w, struct utxo *utxo,
+		     enum wallet_output_type type);
+
+#endif /* WALLET_WALLET_H */