Postgres Data Source (#9475)

* add postgresql datasource

* add rest of files for postgres datasource

* fix timeseries query, remove unused code

* consistent naming, refactoring

* s/mysql/postgres/

* s/mysql/postgres/

* couple more tests

* tests for more datatypes

* fix macros for postgres

* add __timeSec macro

* add frontend for postgres datasource

* adjust documentation

* fix formatting

* add proper plugin description

* merge editor changes from mysql

* port changes from mysql datasource

* set proper defaultQuery for postgres

* add time_sec to timeseries query
accept int for value for timeseries query

* revert allowing time_sec and handle int or float values as unix
timestamp for "time" column

* fix tslint error

* handle decimal values in timeseries query

* allow setting sslmode for postgres datasource

* use type switch for handling data types

* fix value for timeseries query

* refactor timeseries queries to make them more flexible

* remove debug statement from inner loop in type conversion

* use plain for loop in getTypedRowData

* fix timeseries queries

* adjust postgres datasource to tsdb refactoring

* adjust postgres datasource to frontend changes

* update lib/pq to latest version

* move type conversion to getTypedRowData

* handle address types cidr, inet and macaddr

* adjust response parser and docs for annotations

* convert unknown types to string

* add documentation for postgres datasource

* add another example query with metric column

* set more helpful default query

* update help text in query editor

* handle NULL in value column of timeseries query

* add __timeGroup macro

* add test for __timeGroup macro

* document __timeGroup and set proper default query for annotations

* fix typos in docs

* add postgres to list of datasources

* add postgres to builtInPlugins

* mysql: refactoring as prep for merging postgres

Refactors out the initialization of the xorm engine and the query logic
for an sql data source.

* mysql: rename refactoring + test update

* postgres:refactor to use SqlEngine(same as mysql)

Refactored to use a common base class with the MySql data source.

Other changes from the original PR:
- Changed time column to be time_sec to allow other time units in the
future and to be the same as MySQL
- Changed integration test to test the main Query method rather than
the private transformToTable method
- Changed the __timeSec macro name to __timeEpoch
- Renamed PostgresExecutor to PostgresQueryEndpoint

Fixes #9209 (the original PR)

* postgres: encrypt password on config page

With some other cosmetic changes to the config page:
- placeholder texts
- reset button for the password after it has been encrypted.
- default value for the sslmode field.

* postgres: change back col name to time from time_sec

* postgres mysql: remove annotation title

Title has been removed from annotations

* postgres: fix images for docs page

* postgres mysql: fix specs

pkg/tsdb/mysql/mysql_test.go

@@ -18,14 +18,16 @@ func TestMySQL(t *testing.T) {
 	SkipConvey("MySQL", t, func() {
 		x := InitMySQLTestDB(t)
 
-		executor := &MysqlExecutor{
-			engine: x,
-			log:    log.New("tsdb.mysql"),
+		endpoint := &MysqlQueryEndpoint{
+			sqlEngine: &tsdb.DefaultSqlEngine{
+				MacroEngine: NewMysqlMacroEngine(),
+				XormEngine:  x,
+			},
+			log: log.New("tsdb.mysql"),
 		}
 
 		sess := x.NewSession()
 		defer sess.Close()
-		db := sess.DB()
 
 		sql := "CREATE TABLE `mysql_types` ("
 		sql += "`atinyint` tinyint(1),"
@@ -70,14 +72,23 @@ func TestMySQL(t *testing.T) {
 		_, err = sess.Exec(sql)
 		So(err, ShouldBeNil)
 
-		Convey("TransformToTable should map MySQL column types to Go types", func() {
-			rows, err := db.Query("SELECT * FROM mysql_types")
-			defer rows.Close()
+		Convey("Query with Table format should map MySQL column types to Go types", func() {
+			query := &tsdb.TsdbQuery{
+				Queries: []*tsdb.Query{
+					{
+						Model: simplejson.NewFromAny(map[string]interface{}{
+							"rawSql": "SELECT * FROM mysql_types",
+							"format": "table",
+						}),
+						RefId: "A",
+					},
+				},
+			}
+
+			resp, err := endpoint.Query(nil, nil, query)
+			queryResult := resp.Results["A"]
 			So(err, ShouldBeNil)
 
-			queryResult := &tsdb.QueryResult{Meta: simplejson.New()}
-			err = executor.TransformToTable(nil, rows, queryResult)
-			So(err, ShouldBeNil)
 			column := queryResult.Tables[0].Rows[0]
 			So(*column[0].(*int8), ShouldEqual, 1)
 			So(*column[1].(*string), ShouldEqual, "abc")