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client.go
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client.go
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package rethinkdb
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net/url"
"os"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/compose/transporter/client"
"github.com/compose/transporter/log"
version "github.com/hashicorp/go-version"
r "gopkg.in/gorethink/gorethink.v3"
)
const (
// DefaultURI is the default endpoint for RethinkDB on the local machine.
// Primarily used when initializing a new Client without a specific URI.
DefaultURI = "rethinkdb://127.0.0.1:28015/test"
// DefaultTimeout is the default time.Duration used if one is not provided for options
// that pertain to timeouts.
DefaultTimeout = 10 * time.Second
)
var (
_ client.Client = &Client{}
_ client.Closer = &Client{}
rethinkDbVersionMatcher = regexp.MustCompile(`\d+\.\d+(\.\d+)?`)
)
// Client creates and holds the session to RethinkDB
type Client struct {
db, uri string
sessionTimeout, writeTimeout, readTimeout time.Duration
tlsConfig *tls.Config
session *r.Session
}
// Session contains an instance of the rethink.Session for use by Readers/Writers
type Session struct {
session *r.Session
}
// ClientOptionFunc is a function that configures a Client.
// It is used in NewClient.
type ClientOptionFunc func(*Client) error
// NewClient creates a new client to work with RethinkDB.
//
// The caller can configure the new client by passing configuration options
// to the func.
//
// Example:
//
// client, err := NewClient(
// WithURI("rethinkdb://localhost:28015"),
// WithTimeout("30s"))
//
// If no URI is configured, it uses DefaultURI.
//
// An error is also returned when some configuration option is invalid
func NewClient(options ...ClientOptionFunc) (*Client, error) {
// Set up the client
c := &Client{
uri: DefaultURI,
sessionTimeout: DefaultTimeout,
tlsConfig: nil,
}
// Run the options on it
for _, option := range options {
if err := option(c); err != nil {
return nil, err
}
}
return c, nil
}
// WithURI defines the full connection string of the RethinkDB database.
func WithURI(uri string) ClientOptionFunc {
return func(c *Client) error {
_, err := url.Parse(c.uri)
if err != nil {
return client.InvalidURIError{URI: uri, Err: err.Error()}
}
c.uri = uri
return nil
}
}
// WithSessionTimeout overrides the DefaultTimeout and should be parseable by time.ParseDuration
func WithSessionTimeout(timeout string) ClientOptionFunc {
return func(c *Client) error {
if timeout == "" {
c.sessionTimeout = DefaultTimeout
return nil
}
t, err := time.ParseDuration(timeout)
if err != nil {
return client.InvalidTimeoutError{Timeout: timeout}
}
c.sessionTimeout = t
return nil
}
}
// WithWriteTimeout overrides the DefaultTimeout and should be parseable by time.ParseDuration
func WithWriteTimeout(timeout string) ClientOptionFunc {
return func(c *Client) error {
if timeout == "" {
c.writeTimeout = DefaultTimeout
return nil
}
t, err := time.ParseDuration(timeout)
if err != nil {
return client.InvalidTimeoutError{Timeout: timeout}
}
c.writeTimeout = t
return nil
}
}
// WithReadTimeout overrides the DefaultTimeout and should be parseable by time.ParseDuration
func WithReadTimeout(timeout string) ClientOptionFunc {
return func(c *Client) error {
if timeout == "" {
c.readTimeout = DefaultTimeout
return nil
}
t, err := time.ParseDuration(timeout)
if err != nil {
return client.InvalidTimeoutError{Timeout: timeout}
}
c.readTimeout = t
return nil
}
}
// WithSSL configures the database connection to connect via TLS.
func WithSSL(ssl bool) ClientOptionFunc {
return func(c *Client) error {
if ssl {
tlsConfig := &tls.Config{InsecureSkipVerify: true}
tlsConfig.RootCAs = x509.NewCertPool()
c.tlsConfig = tlsConfig
}
return nil
}
}
// WithCACerts configures the RootCAs for the underlying TLS connection
func WithCACerts(certs []string) ClientOptionFunc {
return func(c *Client) error {
if len(certs) > 0 {
roots := x509.NewCertPool()
for _, cert := range certs {
if _, err := os.Stat(cert); err == nil {
filepath.Abs(cert)
c, err := ioutil.ReadFile(cert)
if err != nil {
return err
}
cert = string(c)
}
if ok := roots.AppendCertsFromPEM([]byte(cert)); !ok {
return client.ErrInvalidCert
}
}
if c.tlsConfig != nil {
c.tlsConfig.RootCAs = roots
} else {
c.tlsConfig = &tls.Config{RootCAs: roots}
}
c.tlsConfig.InsecureSkipVerify = false
}
return nil
}
}
// Connect wraps the underlying session to the RethinkDB database
func (c *Client) Connect() (client.Session, error) {
if c.session == nil {
if err := c.initConnection(); err != nil {
return nil, err
}
}
return &Session{c.session}, nil
}
// Close fulfills the Closer interface and takes care of cleaning up the rethink.Session
func (c *Client) Close() {
if c.session != nil {
c.session.Close(r.CloseOpts{NoReplyWait: false})
}
}
func (c *Client) initConnection() error {
uri, _ := url.Parse(c.uri)
c.db = uri.Path[1:]
opts := r.ConnectOpts{
Addresses: strings.Split(uri.Host, ","),
Database: c.db,
Timeout: c.sessionTimeout,
WriteTimeout: c.writeTimeout,
MaxIdle: 10,
MaxOpen: 20,
TLSConfig: c.tlsConfig,
}
if uri.User != nil {
if pwd, ok := uri.User.Password(); ok {
opts.Username = uri.User.Username()
opts.Password = pwd
}
}
log.With("options", opts).Debugln("connection info")
var err error
c.session, err = r.Connect(opts)
if err != nil {
return client.ConnectError{Reason: err.Error()}
}
r.Log = log.Orig()
return c.assertServerVersion()
}
func (c *Client) assertServerVersion() error {
constraint, _ := version.NewConstraint(">= 2.0")
cursor, err := r.DB("rethinkdb").Table("server_status").Run(c.session)
if err != nil {
return err
}
if cursor.IsNil() {
return errors.New("could not determine the RethinkDB server version: no rows returned from the server_status table")
}
var serverStatus struct {
Process struct {
Version string `gorethink:"version"`
} `gorethink:"process"`
}
cursor.Next(&serverStatus)
if serverStatus.Process.Version == "" {
return client.VersionError{
URI: c.uri,
V: serverStatus.Process.Version,
Err: "could not determine the RethinkDB server version: process.version key missing",
}
}
versionString := rethinkDbVersionMatcher.FindString(strings.Split(serverStatus.Process.Version, " ")[1])
if versionString == "" {
return client.VersionError{
URI: c.uri,
V: serverStatus.Process.Version,
Err: "malformed version string",
}
}
v, err := version.NewVersion(versionString)
if err != nil {
return client.VersionError{
URI: c.uri,
V: serverStatus.Process.Version,
Err: err.Error(),
}
}
log.With("version", serverStatus.Process.Version).Debugln("rethinkdb server info")
if !constraint.Check(v) {
return fmt.Errorf("RethinkDB server version too old: expected %v, but was %v", constraint, v)
}
return nil
}