Save Logs to DB (#100)

* Save logs to database

* Save multiple logs to db

* Add block number parameter to `FindLogs`

db/migrations/1513029953_add_logs_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE logs;

db/migrations/1513029953_add_logs_table.up.sql

@@ -0,0 +1,14 @@
+CREATE TABLE logs (
+  id           SERIAL PRIMARY KEY,
+  block_number BIGINT,
+  address      VARCHAR(66),
+  tx_hash      VARCHAR(66),
+  index        BIGINT,
+  topic0       VARCHAR(66),
+  topic1       VARCHAR(66),
+  topic2       VARCHAR(66),
+  topic3       VARCHAR(66),
+  data         TEXT,
+  CONSTRAINT log_uc UNIQUE (block_number, index)
+);
+

db/schema.sql

@@ -73,6 +73,43 @@ CREATE SEQUENCE blocks_id_seq
 ALTER SEQUENCE blocks_id_seq OWNED BY blocks.id;
 
 
+--
+-- Name: logs; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE logs (
+    id integer NOT NULL,
+    block_number bigint,
+    address character varying(66),
+    tx_hash character varying(66),
+    index bigint,
+    topic0 character varying(66),
+    topic1 character varying(66),
+    topic2 character varying(66),
+    topic3 character varying(66),
+    data text
+);
+
+
+--
+-- Name: logs_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE logs_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: logs_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE logs_id_seq OWNED BY logs.id;
+
+
 --
 -- Name: nodes; Type: TABLE; Schema: public; Owner: -
 --
@@ -186,6 +223,13 @@ ALTER SEQUENCE watched_contracts_contract_id_seq OWNED BY watched_contracts.cont
 ALTER TABLE ONLY blocks ALTER COLUMN id SET DEFAULT nextval('blocks_id_seq'::regclass);
 
 
+--
+-- Name: logs id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY logs ALTER COLUMN id SET DEFAULT nextval('logs_id_seq'::regclass);
+
+
 --
 -- Name: nodes id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -223,6 +267,22 @@ ALTER TABLE ONLY watched_contracts
     ADD CONSTRAINT contract_hash_uc UNIQUE (contract_hash);
 
 
+--
+-- Name: logs log_uc; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY logs
+    ADD CONSTRAINT log_uc UNIQUE (block_number, index);
+
+
+--
+-- Name: logs logs_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY logs
+    ADD CONSTRAINT logs_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: nodes node_uc; Type: CONSTRAINT; Schema: public; Owner: -
 --