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postgres.go
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postgres.go
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// Package postgres contains an implementation of the storage.Backend backed by postgres.
package postgres
import (
"context"
"errors"
"time"
"github.com/jackc/pgconn"
"github.com/jackc/pgtype"
"github.com/jackc/pgx/v4"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
"google.golang.org/protobuf/types/known/timestamppb"
"github.com/pomerium/pomerium/pkg/grpc/databroker"
"github.com/pomerium/pomerium/pkg/storage"
)
var (
schemaName = "pomerium"
migrationInfoTableName = "migration_info"
recordsTableName = "records"
recordChangesTableName = "record_changes"
recordChangeNotifyName = "pomerium_record_change"
recordOptionsTableName = "record_options"
leasesTableName = "leases"
)
type querier interface {
Exec(ctx context.Context, sql string, arguments ...interface{}) (commandTag pgconn.CommandTag, err error)
Query(ctx context.Context, sql string, args ...interface{}) (pgx.Rows, error)
QueryRow(ctx context.Context, sql string, args ...interface{}) pgx.Row
}
func deleteChangesBefore(ctx context.Context, q querier, cutoff time.Time) error {
_, err := q.Exec(ctx, `
DELETE FROM `+schemaName+`.`+recordChangesTableName+`
WHERE modified_at < $1
`, cutoff)
return err
}
func dup(record *databroker.Record) *databroker.Record {
return proto.Clone(record).(*databroker.Record)
}
func enforceOptions(ctx context.Context, q querier, recordType string, options *databroker.Options) error {
if options == nil || options.Capacity == nil {
return nil
}
_, err := q.Exec(ctx, `
DELETE FROM `+schemaName+`.`+recordsTableName+`
WHERE type=$1
AND id NOT IN (
SELECT id
FROM `+schemaName+`.`+recordsTableName+`
WHERE type=$1
ORDER BY version DESC
LIMIT $2
)
`, recordType, options.GetCapacity())
return err
}
func getLatestRecordVersion(ctx context.Context, q querier) (recordVersion uint64, err error) {
err = q.QueryRow(ctx, `
SELECT version
FROM `+schemaName+`.`+recordChangesTableName+`
ORDER BY version DESC
LIMIT 1
`).Scan(&recordVersion)
if isNotFound(err) {
err = nil
}
return recordVersion, err
}
func getNextChangedRecord(ctx context.Context, q querier, afterRecordVersion uint64) (*databroker.Record, error) {
var recordType, recordID string
var version uint64
var data pgtype.JSONB
var modifiedAt pgtype.Timestamptz
var deletedAt pgtype.Timestamptz
err := q.QueryRow(ctx, `
SELECT type, id, version, data, modified_at, deleted_at
FROM `+schemaName+`.`+recordChangesTableName+`
WHERE version > $1
`, afterRecordVersion).Scan(&recordType, &recordID, &version, &data, &modifiedAt, &deletedAt)
if isNotFound(err) {
return nil, storage.ErrNotFound
} else if err != nil {
return nil, err
}
var any anypb.Any
err = protojson.Unmarshal(data.Bytes, &any)
if err != nil {
return nil, err
}
return &databroker.Record{
Version: version,
Type: recordType,
Id: recordID,
Data: &any,
ModifiedAt: timestamppbFromTimestamptz(modifiedAt),
DeletedAt: timestamppbFromTimestamptz(deletedAt),
}, nil
}
func getOptions(ctx context.Context, q querier, recordType string) (*databroker.Options, error) {
var capacity pgtype.Int8
err := q.QueryRow(ctx, `
SELECT capacity
FROM `+schemaName+`.`+recordOptionsTableName+`
WHERE type=$1
`, recordType).Scan(&capacity)
if err != nil && !isNotFound(err) {
return nil, err
}
options := new(databroker.Options)
if capacity.Status == pgtype.Present {
options.Capacity = proto.Uint64(uint64(capacity.Int))
}
return options, nil
}
func getRecord(ctx context.Context, q querier, recordType, recordID string) (*databroker.Record, error) {
var version uint64
var data pgtype.JSONB
var modifiedAt pgtype.Timestamptz
err := q.QueryRow(ctx, `
SELECT version, data, modified_at
FROM `+schemaName+`.`+recordsTableName+`
WHERE type=$1 AND id=$2
`, recordType, recordID).Scan(&version, &data, &modifiedAt)
if isNotFound(err) {
return nil, storage.ErrNotFound
} else if err != nil {
return nil, err
}
var any anypb.Any
err = protojson.Unmarshal(data.Bytes, &any)
if err != nil {
return nil, err
}
return &databroker.Record{
Version: version,
Type: recordType,
Id: recordID,
Data: &any,
ModifiedAt: timestamppbFromTimestamptz(modifiedAt),
}, nil
}
func listRecords(ctx context.Context, q querier, expr storage.FilterExpression, offset, limit int) ([]*databroker.Record, error) {
args := []interface{}{offset, limit}
query := `
SELECT type, id, version, data, modified_at
FROM ` + schemaName + `.` + recordsTableName + `
`
if expr != nil {
query += "WHERE "
err := addFilterExpressionToQuery(&query, &args, expr)
if err != nil {
return nil, err
}
}
query += `
ORDER BY type, id
LIMIT $2
OFFSET $1
`
rows, err := q.Query(ctx, query, args...)
if err != nil {
return nil, err
}
defer rows.Close()
var records []*databroker.Record
for rows.Next() {
var recordType, id string
var version uint64
var data pgtype.JSONB
var modifiedAt pgtype.Timestamptz
err = rows.Scan(&recordType, &id, &version, &data, &modifiedAt)
if err != nil {
return nil, err
}
var any anypb.Any
err = protojson.Unmarshal(data.Bytes, &any)
if err != nil {
return nil, err
}
records = append(records, &databroker.Record{
Version: version,
Type: recordType,
Id: id,
Data: &any,
ModifiedAt: timestamppbFromTimestamptz(modifiedAt),
})
}
return records, rows.Err()
}
func maybeAcquireLease(ctx context.Context, q querier, leaseName, leaseID string, ttl time.Duration) (leaseHolderID string, err error) {
tbl := schemaName + "." + leasesTableName
expiresAt := timestamptzFromTimestamppb(timestamppb.New(time.Now().Add(ttl)))
now := timestamptzFromTimestamppb(timestamppb.Now())
err = q.QueryRow(ctx, `
INSERT INTO `+tbl+` (name, id, expires_at)
VALUES ($1, $2, $3)
ON CONFLICT (name) DO UPDATE
SET id=CASE WHEN `+tbl+`.expires_at<$4 OR `+tbl+`.id=$2 THEN $2 ELSE `+tbl+`.id END,
expires_at=CASE WHEN `+tbl+`.expires_at<$4 OR `+tbl+`.id=$2 THEN $3 ELSE `+tbl+`.expires_at END
RETURNING `+tbl+`.id
`, leaseName, leaseID, expiresAt, now).Scan(&leaseHolderID)
return leaseHolderID, err
}
func putRecordAndChange(ctx context.Context, q querier, record *databroker.Record) error {
data, err := jsonbFromAny(record.GetData())
if err != nil {
return err
}
modifiedAt := timestamptzFromTimestamppb(record.GetModifiedAt())
deletedAt := timestamptzFromTimestamppb(record.GetDeletedAt())
indexCIDR := &pgtype.Text{Status: pgtype.Null}
if cidr := storage.GetRecordIndexCIDR(record.GetData()); cidr != nil {
_ = indexCIDR.Set(cidr.String())
}
query := `
WITH t1 AS (
INSERT INTO ` + schemaName + `.` + recordChangesTableName + ` (type, id, data, modified_at, deleted_at)
VALUES ($1, $2, $3, $4, $5)
RETURNING *
)
`
if record.GetDeletedAt() == nil {
query += `
INSERT INTO ` + schemaName + `.` + recordsTableName + ` (type, id, version, data, modified_at, index_cidr)
VALUES ($1, $2, (SELECT version FROM t1), $3, $4, $6)
ON CONFLICT (type, id) DO UPDATE
SET version=(SELECT version FROM t1), data=$3, modified_at=$4, index_cidr=$6
RETURNING ` + schemaName + `.` + recordsTableName + `.version
`
} else {
query += `
DELETE FROM ` + schemaName + `.` + recordsTableName + `
WHERE type=$1 AND id=$2
RETURNING ` + schemaName + `.` + recordsTableName + `.version
`
}
err = q.QueryRow(ctx, query, record.GetType(), record.GetId(), data, modifiedAt, deletedAt, indexCIDR).Scan(&record.Version)
if err != nil {
return err
}
return nil
}
func setOptions(ctx context.Context, q querier, recordType string, options *databroker.Options) error {
capacity := pgtype.Int8{Status: pgtype.Null}
if options != nil && options.Capacity != nil {
capacity.Int = int64(options.GetCapacity())
capacity.Status = pgtype.Present
}
_, err := q.Exec(ctx, `
INSERT INTO `+schemaName+`.`+recordOptionsTableName+` (type, capacity)
VALUES ($1, $2)
ON CONFLICT (type) DO UPDATE
SET capacity=$2
`, recordType, capacity)
return err
}
func signalRecordChange(ctx context.Context, q querier) error {
_, err := q.Exec(ctx, `NOTIFY `+recordChangeNotifyName)
return err
}
func jsonbFromAny(any *anypb.Any) (pgtype.JSONB, error) {
if any == nil {
return pgtype.JSONB{Status: pgtype.Null}, nil
}
bs, err := protojson.Marshal(any)
if err != nil {
return pgtype.JSONB{Status: pgtype.Null}, err
}
return pgtype.JSONB{Bytes: bs, Status: pgtype.Present}, nil
}
func timestamppbFromTimestamptz(ts pgtype.Timestamptz) *timestamppb.Timestamp {
if ts.Status != pgtype.Present {
return nil
}
return timestamppb.New(ts.Time)
}
func timestamptzFromTimestamppb(ts *timestamppb.Timestamp) pgtype.Timestamptz {
if !ts.IsValid() {
return pgtype.Timestamptz{Status: pgtype.Null}
}
return pgtype.Timestamptz{Time: ts.AsTime(), Status: pgtype.Present}
}
func isNotFound(err error) bool {
return errors.Is(err, pgx.ErrNoRows) || errors.Is(err, storage.ErrNotFound)
}