switch postgresql plugin driver - fixes poor handling of system column types.

CHANGELOG.md

@@ -40,8 +40,12 @@ should now look like:
 evaluated at every flush interval, rather than once at startup. This makes it
 consistent with the behavior of `collection_jitter`.
 
+- postgresql plugins switched drivers to better handle oid and name data types.
+allowed removal of special casing data types by column name.
+
 ### Features
 
+- [#1617](https://github.com/influxdata/telegraf/pull/1617): postgresql_extensible now handles name and oid types correctly.
 - [#1413](https://github.com/influxdata/telegraf/issues/1413): Separate container_version from container_image tag.
 - [#1525](https://github.com/influxdata/telegraf/pull/1525): Support setting per-device and total metrics for Docker network and blockio.
 - [#1466](https://github.com/influxdata/telegraf/pull/1466): MongoDB input plugin: adding per DB stats from db.stats()

Godeps

@@ -32,7 +32,6 @@ github.com/influxdata/toml af4df43894b16e3fd2b788d01bd27ad0776ef2d0
 github.com/kardianos/osext 29ae4ffbc9a6fe9fb2bc5029050ce6996ea1d3bc
 github.com/kardianos/service 5e335590050d6d00f3aa270217d288dda1c94d0a
 github.com/klauspost/crc32 19b0b332c9e4516a6370a0456e6182c3b5036720
-github.com/lib/pq e182dc4027e2ded4b19396d638610f2653295f36
 github.com/matttproud/golang_protobuf_extensions d0c3fe89de86839aecf2e0579c40ba3bb336a453
 github.com/miekg/dns cce6c130cdb92c752850880fd285bea1d64439dd
 github.com/mreiferson/go-snappystream 028eae7ab5c4c9e2d1cb4c4ca1e53259bbe7e504
@@ -63,3 +62,4 @@ gopkg.in/dancannon/gorethink.v1 7d1af5be49cb5ecc7b177bf387d232050299d6ef
 gopkg.in/fatih/pool.v2 cba550ebf9bce999a02e963296d4bc7a486cb715
 gopkg.in/mgo.v2 d90005c5262a3463800497ea5a89aed5fe22c886
 gopkg.in/yaml.v2 a83829b6f1293c91addabc89d0571c246397bbf4
+github.com/jackc/pgx bb73d8427902891bbad7b949b9c60b32949d935f

plugins/inputs/postgresql/postgresql.go

@@ -4,14 +4,17 @@ import (
 	"bytes"
 	"database/sql"
 	"fmt"
+	"net"
+	"net/url"
 	"regexp"
 	"sort"
 	"strings"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
 
-	"github.com/lib/pq"
+	"github.com/jackc/pgx"
+	"github.com/jackc/pgx/stdlib"
 )
 
 type Postgresql struct {
@@ -22,7 +25,7 @@ type Postgresql struct {
 	sanitizedAddress string
 }
 
-var ignoredColumns = map[string]bool{"datid": true, "datname": true, "stats_reset": true}
+var ignoredColumns = map[string]bool{"stats_reset": true}
 
 var sampleConfig = `
   ## specify address via a url matching:
@@ -66,7 +69,7 @@ func (p *Postgresql) Gather(acc telegraf.Accumulator) error {
 		p.Address = localhost
 	}
 
-	db, err := sql.Open("postgres", p.Address)
+	db, err := connect(p.Address)
 	if err != nil {
 		return err
 	}
@@ -141,7 +144,7 @@ var passwordKVMatcher, _ = regexp.Compile("password=\\S+ ?")
 func (p *Postgresql) SanitizedAddress() (_ string, err error) {
 	var canonicalizedAddress string
 	if strings.HasPrefix(p.Address, "postgres://") || strings.HasPrefix(p.Address, "postgresql://") {
-		canonicalizedAddress, err = pq.ParseURL(p.Address)
+		canonicalizedAddress, err = parseURL(p.Address)
 		if err != nil {
 			return p.sanitizedAddress, err
 		}
@@ -177,10 +180,7 @@ func (p *Postgresql) accRow(row scanner, acc telegraf.Accumulator) error {
 	}
 	if columnMap["datname"] != nil {
 		// extract the database name from the column map
-		dbnameChars := (*columnMap["datname"]).([]uint8)
-		for i := 0; i < len(dbnameChars); i++ {
-			dbname.WriteString(string(dbnameChars[i]))
-		}
+		dbname.WriteString((*columnMap["datname"]).(string))
 	} else {
 		dbname.WriteString("postgres")
 	}
@@ -210,3 +210,89 @@ func init() {
 		return &Postgresql{}
 	})
 }
+
+// pulled from lib/pq
+// ParseURL no longer needs to be used by clients of this library since supplying a URL as a
+// connection string to sql.Open() is now supported:
+//
+//	sql.Open("postgres", "postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full")
+//
+// It remains exported here for backwards-compatibility.
+//
+// ParseURL converts a url to a connection string for driver.Open.
+// Example:
+//
+//	"postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full"
+//
+// converts to:
+//
+//	"user=bob password=secret host=1.2.3.4 port=5432 dbname=mydb sslmode=verify-full"
+//
+// A minimal example:
+//
+//	"postgres://"
+//
+// This will be blank, causing driver.Open to use all of the defaults
+func parseURL(uri string) (string, error) {
+	u, err := url.Parse(uri)
+	if err != nil {
+		return "", err
+	}
+
+	if u.Scheme != "postgres" && u.Scheme != "postgresql" {
+		return "", fmt.Errorf("invalid connection protocol: %s", u.Scheme)
+	}
+
+	var kvs []string
+	escaper := strings.NewReplacer(` `, `\ `, `'`, `\'`, `\`, `\\`)
+	accrue := func(k, v string) {
+		if v != "" {
+			kvs = append(kvs, k+"="+escaper.Replace(v))
+		}
+	}
+
+	if u.User != nil {
+		v := u.User.Username()
+		accrue("user", v)
+
+		v, _ = u.User.Password()
+		accrue("password", v)
+	}
+
+	if host, port, err := net.SplitHostPort(u.Host); err != nil {
+		accrue("host", u.Host)
+	} else {
+		accrue("host", host)
+		accrue("port", port)
+	}
+
+	if u.Path != "" {
+		accrue("dbname", u.Path[1:])
+	}
+
+	q := u.Query()
+	for k := range q {
+		accrue(k, q.Get(k))
+	}
+
+	sort.Strings(kvs) // Makes testing easier (not a performance concern)
+	return strings.Join(kvs, " "), nil
+}
+
+func connect(address string) (*sql.DB, error) {
+	if strings.HasPrefix(address, "postgres://") || strings.HasPrefix(address, "postgresql://") {
+		return sql.Open("pgx", address)
+	}
+
+	config, err := pgx.ParseDSN(address)
+	if err != nil {
+		return nil, err
+	}
+
+	pool, err := pgx.NewConnPool(pgx.ConnPoolConfig{ConnConfig: config})
+	if err != nil {
+		return nil, err
+	}
+
+	return stdlib.OpenFromConnPool(pool)
+}

plugins/inputs/postgresql/postgresql_test.go

@@ -28,6 +28,7 @@ func TestPostgresqlGeneratesMetrics(t *testing.T) {
 	for _, col := range p.AllColumns {
 		availableColumns[col] = true
 	}
+
 	intMetrics := []string{
 		"xact_commit",
 		"xact_rollback",
@@ -42,7 +43,6 @@ func TestPostgresqlGeneratesMetrics(t *testing.T) {
 		"temp_files",
 		"temp_bytes",
 		"deadlocks",
-		"numbackends",
 		"buffers_alloc",
 		"buffers_backend",
 		"buffers_backend_fsync",
@@ -53,9 +53,20 @@ func TestPostgresqlGeneratesMetrics(t *testing.T) {
 		"maxwritten_clean",
 	}
 
+	int32Metrics := []string{
+		"numbackends",
+	}
+
 	floatMetrics := []string{
 		"blk_read_time",
 		"blk_write_time",
+		"checkpoint_write_time",
+		"checkpoint_sync_time",
+	}
+
+	stringMetrics := []string{
+		"datname",
+		"datid",
 	}
 
 	metricsCounted := 0
@@ -68,6 +79,14 @@ func TestPostgresqlGeneratesMetrics(t *testing.T) {
 		}
 	}
 
+	for _, metric := range int32Metrics {
+		_, ok := availableColumns[metric]
+		if ok {
+			assert.True(t, acc.HasInt32Field("postgresql", metric))
+			metricsCounted++
+		}
+	}
+
 	for _, metric := range floatMetrics {
 		_, ok := availableColumns[metric]
 		if ok {
@@ -76,8 +95,16 @@ func TestPostgresqlGeneratesMetrics(t *testing.T) {
 		}
 	}
 
+	for _, metric := range stringMetrics {
+		_, ok := availableColumns[metric]
+		if ok {
+			assert.True(t, acc.HasStringField("postgresql", metric))
+			metricsCounted++
+		}
+	}
+
 	assert.True(t, metricsCounted > 0)
-	//assert.Equal(t, len(availableColumns)-len(p.IgnoredColumns()), metricsCounted)
+	assert.Equal(t, len(availableColumns)-len(p.IgnoredColumns()), metricsCounted)
 }
 
 func TestPostgresqlTagsMetricsWithDatabaseName(t *testing.T) {