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* added replication metrics: `pg_wal_receiver_status`, `pg_wal_current_lsn`, `pg_wal_receive_lsn`, `pg_wal_reply_lsn`, `pg_wal_replay_paused`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package collector | ||
|
|
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| import ( | ||
| "database/sql" | ||
| "errors" | ||
| "fmt" | ||
| "github.com/blang/semver" | ||
| "net/url" | ||
| "regexp" | ||
| "strings" | ||
| ) | ||
|
|
||
| var ( | ||
| valueRe = `\s*=[\s']*([^\s']+)` | ||
| hostRe = regexp.MustCompile("host" + valueRe) | ||
| hostaddrRe = regexp.MustCompile("hostaddr" + valueRe) | ||
| portRe = regexp.MustCompile("port" + valueRe) | ||
| ) | ||
|
|
||
| func findValue(src string, re *regexp.Regexp) string { | ||
| res := re.FindStringSubmatch(src) | ||
| if len(res) < 2 { | ||
| return "" | ||
| } | ||
| return res[1] | ||
| } | ||
|
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| type replicationStatus struct { | ||
| isInRecovery bool | ||
|
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| currentLsn int64 | ||
| receiveLsn int64 | ||
| replyLsn int64 | ||
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| isReplayPaused bool | ||
|
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| walReceiverStatus int64 | ||
| primaryConnectionInfo string | ||
| } | ||
|
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| func (rs *replicationStatus) primaryHostPort() (string, string, error) { | ||
| ci := rs.primaryConnectionInfo | ||
| if strings.HasPrefix(ci, "postgres://") || strings.HasPrefix(ci, "postgresql://") { | ||
| u, err := url.Parse(ci) | ||
| if err != nil { | ||
| // don't log url.Parse errors since they might contain security sensitive data | ||
| return "", "", fmt.Errorf("failed to parse primary_conninfo") | ||
| } | ||
| return u.Hostname(), u.Port(), nil | ||
| } | ||
| host := findValue(ci, hostRe) | ||
| if host == "" { | ||
| host = findValue(ci, hostaddrRe) | ||
| } | ||
| port := findValue(ci, portRe) | ||
| return host, port, nil | ||
| } | ||
|
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| func (c *Collector) getReplicationStatus(version semver.Version) (*replicationStatus, error) { | ||
| var isInRecovery sql.NullBool | ||
| if err := c.db.QueryRow(`SELECT pg_is_in_recovery()`).Scan(&isInRecovery); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if !isInRecovery.Valid { | ||
| return nil, fmt.Errorf("pg_is_in_recovery() returned null") | ||
| } | ||
|
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| var fCurrentLsn, fReceiveLsn, fReplyLsn, fIsReplayPaused string | ||
| switch { | ||
| // the `pg_stat_wal_receiver` view has been introduced in 9.6 | ||
| case semver.MustParseRange(">=9.6.0 <10.0.0")(version): | ||
| fCurrentLsn = "pg_current_xlog_location" | ||
| fReceiveLsn = "pg_last_xlog_receive_location" | ||
| fReplyLsn = "pg_last_xlog_replay_location" | ||
| fIsReplayPaused = "pg_is_xlog_replay_paused" | ||
| case semver.MustParseRange(">=10.0.0")(version): | ||
| fCurrentLsn = "pg_current_wal_lsn" | ||
| fReceiveLsn = "pg_last_wal_receive_lsn" | ||
| fReplyLsn = "pg_last_wal_replay_lsn" | ||
| fIsReplayPaused = "pg_is_wal_replay_paused" | ||
| default: | ||
| return nil, fmt.Errorf("postgres version %s is not supported", version) | ||
| } | ||
|
|
||
| rs := &replicationStatus{isInRecovery: isInRecovery.Bool} | ||
| if rs.isInRecovery { | ||
| if err := c.db.QueryRow(fmt.Sprintf( | ||
| `SELECT %s()-'0/0', %s()-'0/0', %s()`, fReceiveLsn, fReplyLsn, fIsReplayPaused)).Scan( | ||
| &rs.receiveLsn, &rs.replyLsn, &rs.isReplayPaused); err != nil { | ||
| return nil, err | ||
| } | ||
| if err := c.db.QueryRow(`SELECT count(1) FROM pg_stat_wal_receiver`).Scan(&rs.walReceiverStatus); err != nil { | ||
| return nil, err | ||
| } | ||
| if err := c.db.QueryRow(`SELECT setting FROM pg_settings WHERE name='primary_conninfo'`).Scan(&rs.primaryConnectionInfo); err != nil { | ||
| if !errors.Is(err, sql.ErrNoRows) { | ||
| return nil, err | ||
| } | ||
| } | ||
| } else { | ||
| if err := c.db.QueryRow(fmt.Sprintf(`SELECT %s()-'0/0'`, fCurrentLsn)).Scan(&rs.currentLsn); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return rs, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| package collector | ||
|
|
||
| import ( | ||
| "github.com/stretchr/testify/assert" | ||
| "testing" | ||
| ) | ||
|
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| func Test_parsePrimaryConnectionInfo(t *testing.T) { | ||
| check := func(src string, host, port string) { | ||
| rs := replicationStatus{primaryConnectionInfo: src} | ||
| h, p, err := rs.primaryHostPort() | ||
| assert.NoError(t, err) | ||
| assert.Equal(t, host, h) | ||
| assert.Equal(t, port, p) | ||
| } | ||
|
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| check("host=127.0.0.1 port=5432", "127.0.0.1", "5432") | ||
| check("host=127.0.0.1", "127.0.0.1", "") | ||
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| check("host = 127.0.0.1 port = 5432", "127.0.0.1", "5432") | ||
| check("host = '127.0.0.1' port = 5432", "127.0.0.1", "5432") | ||
| check("host = ' 127.0.0.1 ' port = 5432", "127.0.0.1", "5432") | ||
|
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| check("hostaddr=127.0.0.1 port=5432", "127.0.0.1", "5432") | ||
|
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| check("postgresql://localhost:5433", "localhost", "5433") | ||
| check("postgres://localhost:5433", "localhost", "5433") | ||
| check("postgresql://user:secret@localhost", "localhost", "") | ||
| check("postgresql://other@localhost/otherdb?connect_timeout=10&application_name=myapp", "localhost", "") | ||
| check("postgresql://[2001:db8::1234]/database", "2001:db8::1234", "") | ||
| } |