telegraf/plugins/postgresql/postgresql.go

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package postgresql
import (
"database/sql"
"github.com/influxdb/telegraf/plugins"
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_ "github.com/lib/pq"
)
type Server struct {
Address string
Databases []string
}
type Postgresql struct {
Servers []*Server
}
var sampleConfig = `
# specify servers via an array of tables
[[postgresql.servers]]
# specify address via a url matching:
# postgres://[pqgotest[:password]]@localhost?sslmode=[disable|verify-ca|verify-full]
# or a simple string:
# host=localhost user=pqotest password=... sslmode=...
#
# All connection parameters are optional. By default, the host is localhost
# and the user is the currently running user. For localhost, we default
# to sslmode=disable as well.
#
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address = "sslmode=disable"
# A list of databases to pull metrics about. If not specified, metrics for all
# databases are gathered.
# databases = ["app_production", "blah_testing"]
# [[postgresql.servers]]
# address = "influx@remoteserver"
`
func (p *Postgresql) SampleConfig() string {
return sampleConfig
}
func (p *Postgresql) Description() string {
return "Read metrics from one or many postgresql servers"
}
var localhost = &Server{Address: "sslmode=disable"}
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func (p *Postgresql) Gather(acc plugins.Accumulator) error {
if len(p.Servers) == 0 {
p.gatherServer(localhost, acc)
return nil
}
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for _, serv := range p.Servers {
err := p.gatherServer(serv, acc)
if err != nil {
return err
}
}
return nil
}
func (p *Postgresql) gatherServer(serv *Server, acc plugins.Accumulator) error {
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if serv.Address == "" || serv.Address == "localhost" {
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serv = localhost
}
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db, err := sql.Open("postgres", serv.Address)
if err != nil {
return err
}
defer db.Close()
if len(serv.Databases) == 0 {
rows, err := db.Query(`SELECT * FROM pg_stat_database`)
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
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err := p.accRow(rows, acc, serv.Address)
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if err != nil {
return err
}
}
return rows.Err()
} else {
for _, name := range serv.Databases {
row := db.QueryRow(`SELECT * FROM pg_stat_database WHERE datname=$1`, name)
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err := p.accRow(row, acc, serv.Address)
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if err != nil {
return err
}
}
}
return nil
}
type scanner interface {
Scan(dest ...interface{}) error
}
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func (p *Postgresql) accRow(row scanner, acc plugins.Accumulator, server string) error {
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var ignore interface{}
var name string
var commit, rollback, read, hit int64
var returned, fetched, inserted, updated, deleted int64
var conflicts, temp_files, temp_bytes, deadlocks int64
var read_time, write_time float64
err := row.Scan(&ignore, &name, &ignore,
&commit, &rollback,
&read, &hit,
&returned, &fetched, &inserted, &updated, &deleted,
&conflicts, &temp_files, &temp_bytes,
&deadlocks, &read_time, &write_time,
&ignore,
)
if err != nil {
return err
}
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tags := map[string]string{"server": server, "db": name}
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acc.Add("xact_commit", commit, tags)
acc.Add("xact_rollback", rollback, tags)
acc.Add("blks_read", read, tags)
acc.Add("blks_hit", hit, tags)
acc.Add("tup_returned", returned, tags)
acc.Add("tup_fetched", fetched, tags)
acc.Add("tup_inserted", inserted, tags)
acc.Add("tup_updated", updated, tags)
acc.Add("tup_deleted", deleted, tags)
acc.Add("conflicts", conflicts, tags)
acc.Add("temp_files", temp_files, tags)
acc.Add("temp_bytes", temp_bytes, tags)
acc.Add("deadlocks", deadlocks, tags)
acc.Add("blk_read_time", read_time, tags)
acc.Add("blk_write_time", read_time, tags)
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return nil
}
func init() {
plugins.Add("postgresql", func() plugins.Plugin {
return &Postgresql{}
})
}