/usr/share/gocode/src/github.com/influxdata/influxdb/services/meta/client.go is in golang-github-influxdb-influxdb-dev 1.1.1+dfsg1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 | package meta
import (
"bytes"
crand "crypto/rand"
"crypto/sha256"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"math/rand"
"net/http"
"os"
"path/filepath"
"sort"
"sync"
"time"
"github.com/influxdata/influxdb"
"github.com/influxdata/influxdb/influxql"
"golang.org/x/crypto/bcrypt"
)
const (
// SaltBytes is the number of bytes used for salts
SaltBytes = 32
metaFile = "meta.db"
)
var (
// ErrServiceUnavailable is returned when the meta service is unavailable.
ErrServiceUnavailable = errors.New("meta service unavailable")
// ErrService is returned when the meta service returns an error.
ErrService = errors.New("meta service error")
)
// Client is used to execute commands on and read data from
// a meta service cluster.
type Client struct {
logger *log.Logger
mu sync.RWMutex
closing chan struct{}
changed chan struct{}
cacheData *Data
// Authentication cache.
authCache map[string]authUser
path string
retentionAutoCreate bool
}
type authUser struct {
bhash string
salt []byte
hash []byte
}
// NewClient returns a new *Client.
func NewClient(config *Config) *Client {
return &Client{
cacheData: &Data{
ClusterID: uint64(rand.Int63()),
Index: 1,
},
closing: make(chan struct{}),
changed: make(chan struct{}),
logger: log.New(ioutil.Discard, "[metaclient] ", log.LstdFlags),
authCache: make(map[string]authUser, 0),
path: config.Dir,
retentionAutoCreate: config.RetentionAutoCreate,
}
}
// Open a connection to a meta service cluster.
func (c *Client) Open() error {
c.mu.Lock()
defer c.mu.Unlock()
// Try to load from disk
if err := c.Load(); err != nil {
return err
}
// If this is a brand new instance, persist to disk immediatly.
if c.cacheData.Index == 1 {
if err := snapshot(c.path, c.cacheData); err != nil {
return err
}
}
return nil
}
// Close the meta service cluster connection.
func (c *Client) Close() error {
c.mu.Lock()
defer c.mu.Unlock()
if t, ok := http.DefaultTransport.(*http.Transport); ok {
t.CloseIdleConnections()
}
select {
case <-c.closing:
return nil
default:
close(c.closing)
}
return nil
}
// AcquireLease attempts to acquire the specified lease.
// TODO corylanou remove this for single node
func (c *Client) AcquireLease(name string) (*Lease, error) {
l := Lease{
Name: name,
Expiration: time.Now().Add(DefaultLeaseDuration),
}
return &l, nil
}
func (c *Client) data() *Data {
c.mu.RLock()
defer c.mu.RUnlock()
data := c.cacheData.Clone()
return data
}
// ClusterID returns the ID of the cluster it's connected to.
func (c *Client) ClusterID() uint64 {
c.mu.RLock()
defer c.mu.RUnlock()
return c.cacheData.ClusterID
}
// Database returns info for the requested database.
func (c *Client) Database(name string) *DatabaseInfo {
c.mu.RLock()
defer c.mu.RUnlock()
for _, d := range c.cacheData.Databases {
if d.Name == name {
return &d
}
}
return nil
}
// Databases returns a list of all database infos.
func (c *Client) Databases() []DatabaseInfo {
c.mu.RLock()
defer c.mu.RUnlock()
dbs := c.cacheData.Databases
if dbs == nil {
return []DatabaseInfo{}
}
return dbs
}
// CreateDatabase creates a database or returns it if it already exists
func (c *Client) CreateDatabase(name string) (*DatabaseInfo, error) {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if db := data.Database(name); db != nil {
return db, nil
}
if err := data.CreateDatabase(name); err != nil {
return nil, err
}
// create default retention policy
if c.retentionAutoCreate {
rpi := DefaultRetentionPolicyInfo()
if err := data.CreateRetentionPolicy(name, rpi); err != nil {
return nil, err
}
if err := data.SetDefaultRetentionPolicy(name, rpi.Name); err != nil {
return nil, err
}
}
db := data.Database(name)
if err := c.commit(data); err != nil {
return nil, err
}
return db, nil
}
// CreateDatabaseWithRetentionPolicy creates a database with the specified retention policy.
func (c *Client) CreateDatabaseWithRetentionPolicy(name string, spec *RetentionPolicySpec) (*DatabaseInfo, error) {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if spec.Duration != nil && *spec.Duration < MinRetentionPolicyDuration && *spec.Duration != 0 {
return nil, ErrRetentionPolicyDurationTooLow
}
db := data.Database(name)
if db == nil {
if err := data.CreateDatabase(name); err != nil {
return nil, err
}
db = data.Database(name)
}
rpi := spec.NewRetentionPolicyInfo()
if rp := db.RetentionPolicy(rpi.Name); rp == nil {
if err := data.CreateRetentionPolicy(name, rpi); err != nil {
return nil, err
}
} else if !spec.Matches(rp) {
// Verify that the retention policy with this name matches
// the one already created.
return nil, ErrRetentionPolicyConflict
}
// If no default retention policy has been set, set it to the retention
// policy we just created. If the default is different from what we are
// trying to create, record it as a conflict and abandon with an error.
if db.DefaultRetentionPolicy == "" {
if err := data.SetDefaultRetentionPolicy(name, rpi.Name); err != nil {
return nil, err
}
} else if rpi.Name != db.DefaultRetentionPolicy {
return nil, ErrRetentionPolicyConflict
}
// Refresh the database info.
db = data.Database(name)
if err := c.commit(data); err != nil {
return nil, err
}
return db, nil
}
// DropDatabase deletes a database.
func (c *Client) DropDatabase(name string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.DropDatabase(name); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
// CreateRetentionPolicy creates a retention policy on the specified database.
func (c *Client) CreateRetentionPolicy(database string, spec *RetentionPolicySpec) (*RetentionPolicyInfo, error) {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if spec.Duration != nil && *spec.Duration < MinRetentionPolicyDuration && *spec.Duration != 0 {
return nil, ErrRetentionPolicyDurationTooLow
}
rp := spec.NewRetentionPolicyInfo()
if err := data.CreateRetentionPolicy(database, rp); err != nil {
return nil, err
}
if err := c.commit(data); err != nil {
return nil, err
}
return rp, nil
}
// RetentionPolicy returns the requested retention policy info.
func (c *Client) RetentionPolicy(database, name string) (rpi *RetentionPolicyInfo, err error) {
c.mu.RLock()
defer c.mu.RUnlock()
db := c.cacheData.Database(database)
if db == nil {
return nil, influxdb.ErrDatabaseNotFound(database)
}
return db.RetentionPolicy(name), nil
}
// DropRetentionPolicy drops a retention policy from a database.
func (c *Client) DropRetentionPolicy(database, name string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.DropRetentionPolicy(database, name); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
// SetDefaultRetentionPolicy sets a database's default retention policy.
func (c *Client) SetDefaultRetentionPolicy(database, name string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.SetDefaultRetentionPolicy(database, name); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
// UpdateRetentionPolicy updates a retention policy.
func (c *Client) UpdateRetentionPolicy(database, name string, rpu *RetentionPolicyUpdate) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.UpdateRetentionPolicy(database, name, rpu); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) Users() []UserInfo {
c.mu.RLock()
defer c.mu.RUnlock()
users := c.cacheData.Users
if users == nil {
return []UserInfo{}
}
return users
}
func (c *Client) User(name string) (*UserInfo, error) {
c.mu.RLock()
defer c.mu.RUnlock()
for _, u := range c.cacheData.Users {
if u.Name == name {
return &u, nil
}
}
return nil, ErrUserNotFound
}
// bcryptCost is the cost associated with generating password with bcrypt.
// This setting is lowered during testing to improve test suite performance.
var bcryptCost = bcrypt.DefaultCost
// hashWithSalt returns a salted hash of password using salt
func (c *Client) hashWithSalt(salt []byte, password string) []byte {
hasher := sha256.New()
hasher.Write(salt)
hasher.Write([]byte(password))
return hasher.Sum(nil)
}
// saltedHash returns a salt and salted hash of password
func (c *Client) saltedHash(password string) (salt, hash []byte, err error) {
salt = make([]byte, SaltBytes)
if _, err := io.ReadFull(crand.Reader, salt); err != nil {
return nil, nil, err
}
return salt, c.hashWithSalt(salt, password), nil
}
func (c *Client) CreateUser(name, password string, admin bool) (*UserInfo, error) {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
// See if the user already exists.
if u := data.User(name); u != nil {
if err := bcrypt.CompareHashAndPassword([]byte(u.Hash), []byte(password)); err != nil || u.Admin != admin {
return nil, ErrUserExists
}
return u, nil
}
// Hash the password before serializing it.
hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost)
if err != nil {
return nil, err
}
if err := data.CreateUser(name, string(hash), admin); err != nil {
return nil, err
}
u := data.User(name)
if err := c.commit(data); err != nil {
return nil, err
}
return u, nil
}
func (c *Client) UpdateUser(name, password string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
// Hash the password before serializing it.
hash, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost)
if err != nil {
return err
}
if err := data.UpdateUser(name, string(hash)); err != nil {
return nil
}
delete(c.authCache, name)
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) DropUser(name string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.DropUser(name); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) SetPrivilege(username, database string, p influxql.Privilege) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.SetPrivilege(username, database, p); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) SetAdminPrivilege(username string, admin bool) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.SetAdminPrivilege(username, admin); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) UserPrivileges(username string) (map[string]influxql.Privilege, error) {
c.mu.RLock()
defer c.mu.RUnlock()
p, err := c.cacheData.UserPrivileges(username)
if err != nil {
return nil, err
}
return p, nil
}
func (c *Client) UserPrivilege(username, database string) (*influxql.Privilege, error) {
c.mu.RLock()
defer c.mu.RUnlock()
p, err := c.cacheData.UserPrivilege(username, database)
if err != nil {
return nil, err
}
return p, nil
}
func (c *Client) AdminUserExists() bool {
c.mu.RLock()
defer c.mu.RUnlock()
for _, u := range c.cacheData.Users {
if u.Admin {
return true
}
}
return false
}
func (c *Client) Authenticate(username, password string) (*UserInfo, error) {
// Find user.
c.mu.RLock()
userInfo := c.cacheData.User(username)
c.mu.RUnlock()
if userInfo == nil {
return nil, ErrUserNotFound
}
// Check the local auth cache first.
c.mu.RLock()
au, ok := c.authCache[username]
c.mu.RUnlock()
if ok {
// verify the password using the cached salt and hash
if bytes.Equal(c.hashWithSalt(au.salt, password), au.hash) {
return userInfo, nil
}
// fall through to requiring a full bcrypt hash for invalid passwords
}
// Compare password with user hash.
if err := bcrypt.CompareHashAndPassword([]byte(userInfo.Hash), []byte(password)); err != nil {
return nil, ErrAuthenticate
}
// generate a salt and hash of the password for the cache
salt, hashed, err := c.saltedHash(password)
if err != nil {
return nil, err
}
c.mu.Lock()
c.authCache[username] = authUser{salt: salt, hash: hashed, bhash: userInfo.Hash}
c.mu.Unlock()
return userInfo, nil
}
func (c *Client) UserCount() int {
c.mu.RLock()
defer c.mu.RUnlock()
return len(c.cacheData.Users)
}
// ShardIDs returns a list of all shard ids.
func (c *Client) ShardIDs() []uint64 {
c.mu.RLock()
var a []uint64
for _, dbi := range c.cacheData.Databases {
for _, rpi := range dbi.RetentionPolicies {
for _, sgi := range rpi.ShardGroups {
for _, si := range sgi.Shards {
a = append(a, si.ID)
}
}
}
}
c.mu.RUnlock()
sort.Sort(uint64Slice(a))
return a
}
// ShardGroupsByTimeRange returns a list of all shard groups on a database and policy that may contain data
// for the specified time range. Shard groups are sorted by start time.
func (c *Client) ShardGroupsByTimeRange(database, policy string, min, max time.Time) (a []ShardGroupInfo, err error) {
c.mu.RLock()
defer c.mu.RUnlock()
// Find retention policy.
rpi, err := c.cacheData.RetentionPolicy(database, policy)
if err != nil {
return nil, err
} else if rpi == nil {
return nil, influxdb.ErrRetentionPolicyNotFound(policy)
}
groups := make([]ShardGroupInfo, 0, len(rpi.ShardGroups))
for _, g := range rpi.ShardGroups {
if g.Deleted() || !g.Overlaps(min, max) {
continue
}
groups = append(groups, g)
}
return groups, nil
}
// ShardsByTimeRange returns a slice of shards that may contain data in the time range.
func (c *Client) ShardsByTimeRange(sources influxql.Sources, tmin, tmax time.Time) (a []ShardInfo, err error) {
m := make(map[*ShardInfo]struct{})
for _, src := range sources {
mm, ok := src.(*influxql.Measurement)
if !ok {
return nil, fmt.Errorf("invalid source type: %#v", src)
}
groups, err := c.ShardGroupsByTimeRange(mm.Database, mm.RetentionPolicy, tmin, tmax)
if err != nil {
return nil, err
}
for _, g := range groups {
for i := range g.Shards {
m[&g.Shards[i]] = struct{}{}
}
}
}
a = make([]ShardInfo, 0, len(m))
for sh := range m {
a = append(a, *sh)
}
return a, nil
}
// DropShard deletes a shard by ID.
func (c *Client) DropShard(id uint64) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
data.DropShard(id)
return c.commit(data)
}
// CreateShardGroup creates a shard group on a database and policy for a given timestamp.
func (c *Client) CreateShardGroup(database, policy string, timestamp time.Time) (*ShardGroupInfo, error) {
// Check under a read-lock
c.mu.RLock()
if sg, _ := c.cacheData.ShardGroupByTimestamp(database, policy, timestamp); sg != nil {
c.mu.RUnlock()
return sg, nil
}
c.mu.RUnlock()
c.mu.Lock()
defer c.mu.Unlock()
// Check again under the write lock
data := c.cacheData.Clone()
if sg, _ := data.ShardGroupByTimestamp(database, policy, timestamp); sg != nil {
return sg, nil
}
sgi, err := createShardGroup(data, database, policy, timestamp)
if err != nil {
return nil, err
}
if err := c.commit(data); err != nil {
return nil, err
}
return sgi, nil
}
func createShardGroup(data *Data, database, policy string, timestamp time.Time) (*ShardGroupInfo, error) {
// It is the responsibility of the caller to check if it exists before calling this method.
if sg, _ := data.ShardGroupByTimestamp(database, policy, timestamp); sg != nil {
return nil, ErrShardGroupExists
}
if err := data.CreateShardGroup(database, policy, timestamp); err != nil {
return nil, err
}
rpi, err := data.RetentionPolicy(database, policy)
if err != nil {
return nil, err
} else if rpi == nil {
return nil, errors.New("retention policy deleted after shard group created")
}
sgi := rpi.ShardGroupByTimestamp(timestamp)
return sgi, nil
}
// DeleteShardGroup removes a shard group from a database and retention policy by id.
func (c *Client) DeleteShardGroup(database, policy string, id uint64) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.DeleteShardGroup(database, policy, id); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
// PrecreateShardGroups creates shard groups whose endtime is before the 'to' time passed in, but
// is yet to expire before 'from'. This is to avoid the need for these shards to be created when data
// for the corresponding time range arrives. Shard creation involves Raft consensus, and precreation
// avoids taking the hit at write-time.
func (c *Client) PrecreateShardGroups(from, to time.Time) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
var changed bool
for _, di := range data.Databases {
for _, rp := range di.RetentionPolicies {
if len(rp.ShardGroups) == 0 {
// No data was ever written to this group, or all groups have been deleted.
continue
}
g := rp.ShardGroups[len(rp.ShardGroups)-1] // Get the last group in time.
if !g.Deleted() && g.EndTime.Before(to) && g.EndTime.After(from) {
// Group is not deleted, will end before the future time, but is still yet to expire.
// This last check is important, so the system doesn't create shards groups wholly
// in the past.
// Create successive shard group.
nextShardGroupTime := g.EndTime.Add(1 * time.Nanosecond)
// if it already exists, continue
if sg, _ := data.ShardGroupByTimestamp(di.Name, rp.Name, nextShardGroupTime); sg != nil {
c.logger.Printf("shard group %d exists for database %s, retention policy %s", sg.ID, di.Name, rp.Name)
continue
}
newGroup, err := createShardGroup(data, di.Name, rp.Name, nextShardGroupTime)
if err != nil {
c.logger.Printf("failed to precreate successive shard group for group %d: %s", g.ID, err.Error())
continue
}
changed = true
c.logger.Printf("new shard group %d successfully precreated for database %s, retention policy %s", newGroup.ID, di.Name, rp.Name)
}
}
}
if changed {
if err := c.commit(data); err != nil {
return err
}
}
return nil
}
// ShardOwner returns the owning shard group info for a specific shard.
func (c *Client) ShardOwner(shardID uint64) (database, policy string, sgi *ShardGroupInfo) {
c.mu.RLock()
defer c.mu.RUnlock()
for _, dbi := range c.cacheData.Databases {
for _, rpi := range dbi.RetentionPolicies {
for _, g := range rpi.ShardGroups {
if g.Deleted() {
continue
}
for _, sh := range g.Shards {
if sh.ID == shardID {
database = dbi.Name
policy = rpi.Name
sgi = &g
return
}
}
}
}
}
return
}
func (c *Client) CreateContinuousQuery(database, name, query string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.CreateContinuousQuery(database, name, query); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) DropContinuousQuery(database, name string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.DropContinuousQuery(database, name); err != nil {
return nil
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) CreateSubscription(database, rp, name, mode string, destinations []string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.CreateSubscription(database, rp, name, mode, destinations); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) DropSubscription(database, rp, name string) error {
c.mu.Lock()
defer c.mu.Unlock()
data := c.cacheData.Clone()
if err := data.DropSubscription(database, rp, name); err != nil {
return err
}
if err := c.commit(data); err != nil {
return err
}
return nil
}
func (c *Client) SetData(data *Data) error {
c.mu.Lock()
// reset the index so the commit will fire a change event
c.cacheData.Index = 0
// increment the index to force the changed channel to fire
d := data.Clone()
d.Index++
if err := c.commit(d); err != nil {
return err
}
c.mu.Unlock()
return nil
}
func (c *Client) Data() Data {
c.mu.RLock()
defer c.mu.RUnlock()
d := c.cacheData.Clone()
return *d
}
// WaitForDataChanged will return a channel that will get closed when
// the metastore data has changed
func (c *Client) WaitForDataChanged() chan struct{} {
c.mu.RLock()
defer c.mu.RUnlock()
return c.changed
}
// commit assumes it is under a full lock
func (c *Client) commit(data *Data) error {
data.Index++
// try to write to disk before updating in memory
if err := snapshot(c.path, data); err != nil {
return err
}
// update in memory
c.cacheData = data
// close channels to signal changes
close(c.changed)
c.changed = make(chan struct{})
return nil
}
func (c *Client) MarshalBinary() ([]byte, error) {
c.mu.RLock()
defer c.mu.RUnlock()
return c.cacheData.MarshalBinary()
}
// SetLogOutput sets the writer to which all logs are written. It must not be
// called after Open is called.
func (c *Client) SetLogOutput(w io.Writer) {
c.mu.Lock()
defer c.mu.Unlock()
c.logger = log.New(w, "[metaclient] ", log.LstdFlags)
}
func (c *Client) updateAuthCache() {
// copy cached user info for still-present users
newCache := make(map[string]authUser, len(c.authCache))
for _, userInfo := range c.cacheData.Users {
if cached, ok := c.authCache[userInfo.Name]; ok {
if cached.bhash == userInfo.Hash {
newCache[userInfo.Name] = cached
}
}
}
c.authCache = newCache
}
// snapshot will save the current meta data to disk
func snapshot(path string, data *Data) error {
file := filepath.Join(path, metaFile)
tmpFile := file + "tmp"
f, err := os.Create(tmpFile)
if err != nil {
return err
}
defer f.Close()
var d []byte
if b, err := data.MarshalBinary(); err != nil {
return err
} else {
d = b
}
if _, err := f.Write(d); err != nil {
return err
}
if err = f.Sync(); err != nil {
return err
}
//close file handle before renaming to support Windows
if err = f.Close(); err != nil {
return err
}
return renameFile(tmpFile, file)
}
// Load will save the current meta data from disk
func (c *Client) Load() error {
file := filepath.Join(c.path, metaFile)
f, err := os.Open(file)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return err
}
if err := c.cacheData.UnmarshalBinary(data); err != nil {
return err
}
return nil
}
type uint64Slice []uint64
func (a uint64Slice) Len() int { return len(a) }
func (a uint64Slice) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a uint64Slice) Less(i, j int) bool { return a[i] < a[j] }
|