97e980cd8a
storagenodes have like 10 or more databases. without this tag they all get sent as the same value, stomping on each other. Change-Id: Ib12019684d6ea8f2a5b83df584056dfa79e3c4b3
109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package pgutil
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import (
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"context"
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"strings"
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"github.com/lib/pq"
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"github.com/spacemonkeygo/monkit/v3"
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"github.com/zeebo/errs"
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"storj.io/storj/private/dbutil"
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"storj.io/storj/private/dbutil/dbschema"
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"storj.io/storj/private/tagsql"
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)
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var (
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mon = monkit.Package()
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)
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// OpenUnique opens a postgres database with a temporary unique schema, which will be cleaned up
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// when closed. It is expected that this should normally be used by way of
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// "storj.io/storj/private/dbutil/tempdb".OpenUnique() instead of calling it directly.
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func OpenUnique(ctx context.Context, connstr string, schemaPrefix string) (*dbutil.TempDatabase, error) {
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// sanity check, because you get an unhelpful error message when this happens
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if strings.HasPrefix(connstr, "cockroach://") {
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return nil, errs.New("can't connect to cockroach using pgutil.OpenUnique()! connstr=%q. try tempdb.OpenUnique() instead?", connstr)
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}
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schemaName := schemaPrefix + "-" + CreateRandomTestingSchemaName(8)
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connStrWithSchema := ConnstrWithSchema(connstr, schemaName)
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db, err := tagsql.Open("postgres", connStrWithSchema)
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if err == nil {
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// check that connection actually worked before trying CreateSchema, to make
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// troubleshooting (lots) easier
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err = db.PingContext(ctx)
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}
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if err != nil {
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return nil, errs.New("failed to connect to %q with driver postgres: %w", connStrWithSchema, err)
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}
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err = CreateSchema(ctx, db, schemaName)
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if err != nil {
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return nil, errs.Combine(err, db.Close())
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}
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cleanup := func(cleanupDB tagsql.DB) error {
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return DropSchema(ctx, cleanupDB, schemaName)
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}
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dbutil.Configure(db, "tmp_postgres", mon)
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return &dbutil.TempDatabase{
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DB: db,
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ConnStr: connStrWithSchema,
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Schema: schemaName,
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Driver: "postgres",
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Implementation: dbutil.Postgres,
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Cleanup: cleanup,
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}, nil
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}
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// QuerySnapshot loads snapshot from database
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func QuerySnapshot(ctx context.Context, db dbschema.Queryer) (*dbschema.Snapshot, error) {
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schema, err := QuerySchema(ctx, db)
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if err != nil {
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return nil, err
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}
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data, err := QueryData(ctx, db, schema)
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if err != nil {
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return nil, err
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}
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return &dbschema.Snapshot{
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Version: -1,
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Schema: schema,
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Data: data,
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}, err
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}
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// CheckApplicationName ensures that the Connection String contains an application name
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func CheckApplicationName(s string) (r string) {
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if !strings.Contains(s, "application_name") {
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if !strings.Contains(s, "?") {
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r = s + "?application_name=Satellite"
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return
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}
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r = s + "&application_name=Satellite"
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return
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}
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// return source as is if application_name is set
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return s
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}
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// IsConstraintError checks if given error is about constraint violation
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func IsConstraintError(err error) bool {
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return errs.IsFunc(err, func(err error) bool {
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if e, ok := err.(*pq.Error); ok {
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if e.Code.Class() == "23" {
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return true
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}
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}
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return false
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})
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}
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