X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fpostrr.sql.in;h=a3bff336ae94ef5288b4ab927a7a3c4704359d83;hb=2072e784f2fab50bff6aa25831d14424d0f575ec;hp=01cd65f8a6be9b2c49339c629f6f0efcc72a6f4e;hpb=ec00d193ed161a58be46f62fed81adfc5612cfde;p=postrr.git

diff --git a/src/postrr.sql.in b/src/postrr.sql.in
index 01cd65f..a3bff33 100644
--- a/src/postrr.sql.in
+++ b/src/postrr.sql.in
@@ -45,6 +45,14 @@ CREATE TABLE postrr.rrtimeslices (
 	tsnum integer NOT NULL
 );
 
+CREATE TABLE postrr.rrarchives (
+	rraname text NOT NULL,
+	tbl name NOT NULL,
+	tscol name NOT NULL,
+	vcol name NOT NULL,
+	UNIQUE (rraname, tbl, tscol, vcol)
+);
+
 CREATE OR REPLACE FUNCTION PostRR_Version()
 	RETURNS cstring
 	AS 'postrr-@POSTRR_MAJOR_VERSION@.@POSTRR_MINOR_VERSION@', 'postrr_version'
@@ -100,15 +108,29 @@ CREATE CAST (rrtimeslice AS rrtimeslice)
 	WITH FUNCTION RRTimeslice(rrtimeslice, integer, boolean)
 	AS IMPLICIT;
 
-CREATE OR REPLACE FUNCTION Tstamp(rrtimeslice)
-	RETURNS timestamp
-	AS 'postrr-@POSTRR_MAJOR_VERSION@.@POSTRR_MINOR_VERSION@', 'rrtimeslice_to_timestamp'
+CREATE OR REPLACE FUNCTION RRTimeslice(timestamptz, integer, boolean)
+	RETURNS rrtimeslice
+	AS 'postrr-@POSTRR_MAJOR_VERSION@.@POSTRR_MINOR_VERSION@', 'timestamptz_to_rrtimeslice'
+	LANGUAGE 'C' IMMUTABLE STRICT;
+
+CREATE CAST (timestamptz AS rrtimeslice)
+	WITH FUNCTION RRTimeslice(timestamptz, integer, boolean)
+	AS IMPLICIT;
+
+CREATE OR REPLACE FUNCTION Tstamptz(rrtimeslice)
+	RETURNS timestamptz
+	AS 'postrr-@POSTRR_MAJOR_VERSION@.@POSTRR_MINOR_VERSION@', 'rrtimeslice_to_timestamptz'
 	LANGUAGE 'C' IMMUTABLE STRICT;
 
-CREATE CAST (rrtimeslice AS timestamp)
-	WITH FUNCTION Tstamp(rrtimeslice);
+CREATE CAST (rrtimeslice AS timestamptz)
+	WITH FUNCTION Tstamptz(rrtimeslice);
 	-- EXPLICIT
 
+CREATE OR REPLACE FUNCTION rrtimeslice_cmp(rrtimeslice, rrtimeslice)
+	RETURNS integer
+	AS 'postrr-@POSTRR_MAJOR_VERSION@.@POSTRR_MINOR_VERSION@', 'rrtimeslice_cmp'
+	LANGUAGE 'C' IMMUTABLE STRICT;
+
 CREATE OR REPLACE FUNCTION rrtimeslice_seq_eq(rrtimeslice, rrtimeslice)
 	RETURNS boolean
 	AS 'postrr-@POSTRR_MAJOR_VERSION@.@POSTRR_MINOR_VERSION@', 'rrtimeslice_seq_eq'
@@ -294,6 +316,98 @@ CREATE OR REPLACE FUNCTION CData_update(cdata, cdata)
 	AS 'postrr-@POSTRR_MAJOR_VERSION@.@POSTRR_MINOR_VERSION@', 'cdata_update'
 	LANGUAGE 'C' IMMUTABLE;
 
+CREATE OR REPLACE FUNCTION PostRR_update(name, name, name, timestamptz, double precision)
+	RETURNS cdata
+	LANGUAGE plpgsql
+	AS $$
+DECLARE
+	tbl ALIAS FOR $1;
+	tscol ALIAS FOR $2;
+	vcol ALIAS FOR $3;
+	ts ALIAS FOR $4;
+	value ALIAS FOR $5;
+	ts_str text;
+	v_str text;
+	update_qry text;
+	status integer;
+	newts rrtimeslice;
+	new cdata;
+BEGIN
+	tscol  := quote_ident(tscol);
+	vcol   := quote_ident(vcol);
+	ts_str := quote_literal(ts);
+	v_str  := quote_literal(value);
+
+	update_qry = 'CData_update(' || vcol || ', ' || v_str || ')';
+
+	-- XXX: handle race conditions
+
+	LOOP
+		BEGIN
+			-- removing matching (by sequence no) old entries
+			EXECUTE 'DELETE FROM ' || tbl
+				|| ' WHERE rrtimeslice_cmp(' || tscol || ', ' || ts_str
+				|| ') = -1; '
+				|| 'SELECT rrtimeslice_cmp(' || tscol || ', ' || ts_str
+				|| ') AS status FROM ' || tbl
+				|| ' WHERE ' || tscol || ' = ' || ts_str
+				INTO STRICT status;
+
+			EXCEPTION
+				WHEN NO_DATA_FOUND THEN
+					EXECUTE 'INSERT INTO ' || tbl
+						|| ' (' || tscol || ', ' || vcol
+						|| ') VALUES (' || ts_str || ', ' || v_str
+						|| ') RETURNING ' || tscol || ', ' || vcol
+						INTO newts, new;
+					-- use strict again; on exception retry?
+					RETURN new;
+				WHEN TOO_MANY_ROWS THEN
+					RAISE EXCEPTION '% is not unique in %.%',
+						ts_str, tbl, tscol;
+		END;
+
+		IF status = 0 THEN
+			-- timestamps match
+			EXECUTE 'UPDATE ' || tbl
+				|| ' SET ' || vcol || ' = ' || update_qry
+				|| ' WHERE ' || tscol || ' = ' || ts_str
+				|| ' RETURNING ' || tscol || ', ' || vcol
+				INTO STRICT newts, new;
+		ELSIF status < 0 THEN
+			-- someone else inserted older data in the meantime
+			-- => try again
+			CONTINUE;
+		ELSE
+			RAISE EXCEPTION '% is too old in %.%', ts_str, tbl, tscol;
+		END IF;
+		EXIT;
+	END LOOP;
+	RETURN new;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION PostRR_update(text, timestamptz, double precision)
+	RETURNS SETOF cdata
+	LANGUAGE plpgsql
+	AS $$
+DECLARE
+	-- $1: rraname
+	-- $2: timestamp
+	-- $3: value
+	adef RECORD;
+	new cdata;
+BEGIN
+	FOR adef IN SELECT tbl, tscol, vcol FROM postrr.rrarchives
+			WHERE postrr.rrarchives.rraname = $1 LOOP
+		SELECT PostRR_update(adef.tbl, adef.tscol, adef.vcol, $2, $3)
+			INTO new;
+		RETURN NEXT new;
+	END LOOP;
+	RETURN;
+END;
+$$;
+
 COMMIT;
 
 SET client_min_messages TO DEFAULT;