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server.go
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server.go
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package main
import (
"github.com/nu7hatch/gouuid"
"github.com/clawio/service-auth/lib"
pb "github.com/clawio/service-localfsxattr-redisprop/proto/propagator"
"github.com/garyburd/redigo/redis"
rus "github.com/sirupsen/logrus"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"path"
"strings"
"time"
)
var (
unauthenticatedError = grpc.Errorf(codes.Unauthenticated, "identity not found")
permissionDenied = grpc.Errorf(codes.PermissionDenied, "access denied")
)
// debugLogger satisfies Gorm's logger interface
// so that we can log SQL queries at Logrus' debug level
type debugLogger struct{}
func (*debugLogger) Print(msg ...interface{}) {
rus.Debug(msg)
}
type newServerParams struct {
dsn string
sharedSecret string
maxRedisIdle int
maxRedisActive int
pool *redis.Pool
}
func newServer(p *newServerParams) (*server, error) {
pool := &redis.Pool{
Wait: true,
MaxIdle: p.maxRedisIdle,
MaxActive: p.maxRedisActive,
IdleTimeout: 0,
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", p.dsn)
if err != nil {
return nil, err
}
/*
if _, err := c.Do("AUTH", password); err != nil {
c.Close()
return nil, err
}
*/
return c, err
},
TestOnBorrow: func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
},
}
s := &server{}
s.pool = pool
s.p = p
return s, nil
}
type server struct {
p *newServerParams
pool *redis.Pool
}
func (s *server) Get(ctx context.Context, req *pb.GetReq) (*pb.Record, error) {
traceID, err := getGRPCTraceID(ctx)
if err != nil {
rus.Error(err)
return &pb.Record{}, err
}
log := rus.WithField("trace", traceID).WithField("svc", serviceID)
ctx = newGRPCTraceContext(ctx, traceID)
log.Info("request started")
// Time request
reqStart := time.Now()
defer func() {
// Compute request duration
reqDur := time.Since(reqStart)
// Log access info
log.WithFields(rus.Fields{
"method": "get",
"type": "grpcaccess",
"duration": reqDur.Seconds(),
}).Info("request finished")
}()
idt, err := lib.ParseToken(req.AccessToken, s.p.sharedSecret)
if err != nil {
log.Error(err)
return &pb.Record{}, unauthenticatedError
}
log.Infof("%s", idt)
p := path.Clean(req.Path)
log.Infof("path is %s", p)
var rec *record
rec, err = s.getByPath(p)
if err != nil {
log.Error(err)
return &pb.Record{}, err
}
//When Etag is not set or mtime is not set means that the record is not in Redis
if rec.ETag == "" || rec.MTime == 0 {
if !req.ForceCreation {
return &pb.Record{}, err
}
in := &pb.PutReq{}
in.AccessToken = req.AccessToken
in.Path = req.Path
_, e := s.Put(ctx, in)
if e != nil {
return &pb.Record{}, err
}
rec, err = s.getByPath(p)
if err != nil {
return &pb.Record{}, nil
}
}
r := &pb.Record{}
r.Path = rec.Path
r.Etag = rec.ETag
r.Modified = rec.MTime
return r, nil
}
func (s *server) Mv(ctx context.Context, req *pb.MvReq) (*pb.Void, error) {
traceID, err := getGRPCTraceID(ctx)
if err != nil {
rus.Error(err)
return &pb.Void{}, err
}
log := rus.WithField("trace", traceID).WithField("svc", serviceID)
ctx = newGRPCTraceContext(ctx, traceID)
log.Info("request started")
// Time request
reqStart := time.Now()
defer func() {
// Compute request duration
reqDur := time.Since(reqStart)
// Log access info
log.WithFields(rus.Fields{
"method": "mv",
"type": "grpcaccess",
"duration": reqDur.Seconds(),
}).Info("request finished")
}()
idt, err := lib.ParseToken(req.AccessToken, s.p.sharedSecret)
if err != nil {
log.Error(err)
return &pb.Void{}, unauthenticatedError
}
log.Infof("%s", idt)
src := path.Clean(req.Src)
dst := path.Clean(req.Dst)
log.Infof("src path is %s", src)
log.Infof("dst path is %s", dst)
recs, err := s.getRecordsWithPathPrefix(src)
if err != nil {
log.Error(err)
return &pb.Void{}, nil
}
con := s.pool.Get()
// Close the connection as the pool does not work with connections that has
// been used for transactions
defer con.Close()
// When watching the key we are sure that if the key gets modified the transaction will fail
// is the alternative to mtime < newmtime
// if update was succesfull returns 1 and if not returns 0 (no keys updated)
for _, rec := range recs {
con.Send("WATCH", rec.Path)
}
con.Send("MULTI")
for _, rec := range recs {
newPath := path.Join(dst, path.Clean(strings.TrimPrefix(rec.Path, src)))
log.Infof("src path %s will be renamed to %s", rec.Path, newPath)
con.Send("HMSET", newPath, "etag", rec.ETag, "mtime", rec.MTime)
con.Send("DEL", rec.Path)
}
_, err = con.Do("EXEC")
if err != nil {
return &pb.Void{}, err
}
log.Infof("renamed %d entries", len(recs))
rawUUID, err := uuid.NewV4()
if err != nil {
return &pb.Void{}, err
}
etag := rawUUID.String()
mtime := uint32(time.Now().Unix())
err = s.propagateChanges(ctx, dst, etag, mtime, "")
if err != nil {
log.Error(err)
}
log.Infof("propagated changes till %s", "")
return &pb.Void{}, nil
}
func (s *server) getRecordsWithPathPrefix(p string) ([]record, error) {
var (
cursor int64
items []string
recs []record
)
con := s.pool.Get()
defer con.Close()
results := make([]string, 0)
for {
values, err := redis.Values(con.Do("SCAN", cursor, "MATCH", p+"/*"))
if err != nil {
return recs, err
}
values, err = redis.Scan(values, &cursor, &items)
if err != nil {
return recs, err
}
results = append(results, items...)
if cursor == 0 {
break
}
}
// the regex do not match the current path so we add it manually
items = append(items, p)
// TODO(labkode) results can contain duplicated items, be sure to clean before return
for _, k := range items {
con.Send("HGETALL", k)
}
err := con.Flush()
if err != nil {
return recs, err
}
for _, k := range items {
value, err := redis.Values(con.Receive())
if err != nil {
return recs, err
}
r := record{}
if err := redis.ScanStruct(value, &r); err != nil {
return recs, err
}
r.Path = k
if r.ETag != "" && r.MTime != 0 {
recs = append(recs, r)
}
}
return recs, nil
}
func (s *server) Rm(ctx context.Context, req *pb.RmReq) (*pb.Void, error) {
traceID, err := getGRPCTraceID(ctx)
if err != nil {
rus.Error(err)
return &pb.Void{}, err
}
if err != nil {
rus.Error(err)
return &pb.Void{}, err
}
log := rus.WithField("trace", traceID).WithField("svc", serviceID)
ctx = newGRPCTraceContext(ctx, traceID)
log.Info("request started")
// Time request
reqStart := time.Now()
defer func() {
// Compute request duration
reqDur := time.Since(reqStart)
// Log access info
log.WithFields(rus.Fields{
"method": "rm",
"type": "grpcaccess",
"duration": reqDur.Seconds(),
}).Info("request finished")
}()
idt, err := lib.ParseToken(req.AccessToken, s.p.sharedSecret)
if err != nil {
log.Error(err)
return &pb.Void{}, unauthenticatedError
}
log.Infof("%s", idt)
p := path.Clean(req.Path)
log.Infof("path is %s", p)
con := s.pool.Get()
defer con.Close()
_, err = con.Do("DEL", p)
if err != nil {
log.Error(err)
return &pb.Void{}, err
}
ts := time.Now().Unix()
rawUUID, err := uuid.NewV4()
if err != nil {
return &pb.Void{}, err
}
err = s.propagateChanges(ctx, p, rawUUID.String(), uint32(ts), "")
if err != nil {
log.Error(err)
}
log.Infof("propagated changes till %s", "")
return &pb.Void{}, nil
}
func (s *server) Put(ctx context.Context, req *pb.PutReq) (*pb.Void, error) {
traceID, err := getGRPCTraceID(ctx)
if err != nil {
rus.Error(err)
return &pb.Void{}, err
}
if err != nil {
rus.Error(err)
return &pb.Void{}, err
}
log := rus.WithField("trace", traceID).WithField("svc", serviceID)
ctx = newGRPCTraceContext(ctx, traceID)
log.Info("request started")
// Time request
reqStart := time.Now()
defer func() {
// Compute request duration
reqDur := time.Since(reqStart)
// Log access info
log.WithFields(rus.Fields{
"method": "put",
"type": "grpcaccess",
"duration": reqDur.Seconds(),
}).Info("request finished")
}()
idt, err := lib.ParseToken(req.AccessToken, s.p.sharedSecret)
if err != nil {
log.Error(err)
return &pb.Void{}, unauthenticatedError
}
log.Infof("%s", idt)
p := path.Clean(req.Path)
log.Infof("path is %s", p)
rawUUID, err := uuid.NewV4()
if err != nil {
return &pb.Void{}, err
}
var etag = rawUUID.String()
var mtime = uint32(time.Now().Unix())
log.Infof("new record will have path=%s etag=%s mtime=%d", p, etag, mtime)
err = s.insert(p, etag, mtime)
if err != nil {
log.Error(err)
return &pb.Void{}, err
}
log.Infof("new record saved to db")
err = s.propagateChanges(ctx, p, etag, mtime, "")
if err != nil {
log.Error(err)
}
log.Infof("propagated changes till ancestor %s", "")
return &pb.Void{}, nil
}
// Redis returns nil when the key is not found
func (s *server) getByPath(path string) (*record, error) {
con := s.pool.Get()
defer con.Close()
v, err := redis.Values(con.Do("HGETALL", path))
if err != nil {
return nil, err
}
r := &record{}
if err := redis.ScanStruct(v, r); err != nil {
return nil, err
}
r.Path = path
return r, nil
}
func (s *server) insert(p, etag string, mtime uint32) error {
con := s.pool.Get()
// Close the connection as the pool does not work with connections that has
// been used for transactions
defer con.Close()
// When watching the key we are sure that if the key gets modified the transaction will fail
// is the alternative to mtime < newmtime
// if update was succesfull returns 1 and if not returns 0 (no keys updated)
con.Send("WATCH", p)
con.Send("MULTI")
r := &record{}
r.ETag = etag
r.MTime = mtime
con.Send("HMSET", p, "etag", r.ETag, "mtime", r.MTime)
_, err := con.Do("EXEC")
if err != nil {
return err
}
return nil
}
func (s *server) update(p, etag string, mtime uint32) int64 {
err := s.insert(p, etag, mtime)
if err != nil {
return 0
}
return 1
}
// propagateChanges propagates mtime and etag until the user home directory
// This propagation is needed for the client discovering changes
// Ex: given the succesfull upload of the file /local/users/d/demo/photos/1.png
// the etag and mtime will be propagated to:
// - /local/users/d/demo/photos
// - /local/users/d/demo
func (s *server) propagateChanges(ctx context.Context, p, etag string, mtime uint32, stopPath string) error {
traceID, err := getGRPCTraceID(ctx)
if err != nil {
rus.Error(err)
return err
}
log := rus.WithField("trace", traceID).WithField("svc", serviceID)
ctx = newGRPCTraceContext(ctx, traceID)
// TODO(labkode) assert the list ordered from most deeper to less so we can shortcircuit
// after first miss
paths := getPathsTillHome(ctx, p)
for _, p := range paths {
numRows := s.update(p, etag, mtime)
if numRows == 0 {
log.Warnf("parent path %s has been updated in the meanwhile so we do not override with old info. Propagation stopped", p)
// Following the CAS tree approach it does not make sense to update\
// parents if child has been updated wit new info
break
}
log.Infof("parent path %s has being updated", p)
}
return nil
}
func getPathsTillHome(ctx context.Context, p string) []string {
paths := []string{}
tokens := strings.Split(p, "/")
if len(tokens) < 5 {
// if not under home dir we do not propagate
return paths
}
homeTokens := tokens[0:5]
restTokens := tokens[5:]
home := path.Clean("/" + path.Join(homeTokens...))
previous := home
paths = append(paths, previous)
for _, token := range restTokens {
previous = path.Join(previous, path.Clean(token))
paths = append(paths, previous)
}
if len(paths) >= 1 {
paths = paths[:len(paths)-1] // remove inserted/updated path from paths to update
}
//reverse it to have deeper paths first to shortcircuit
for i := len(paths)/2 - 1; i >= 0; i-- {
opp := len(paths) - 1 - i
paths[i], paths[opp] = paths[opp], paths[i]
}
return paths
}