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Remove SQL state locking and rely on sqlite locking

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Also renames some parameters from locksDir -> lockDir for
consistency.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
This commit is contained in:
Matthew Heon
2017-11-27 13:42:45 -05:00
parent abfd18b0db
commit e9298a533a
5 changed files with 19 additions and 45 deletions
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4
libpod/container.go
View File

@ -338,7 +338,7 @@ func (c *Container) syncContainer() error {
}
// Make a new container
func newContainer(rspec *spec.Spec, logDir string) (*Container, error) {
func newContainer(rspec *spec.Spec, lockDir string) (*Container, error) {
if rspec == nil {
return nil, errors.Wrapf(ErrInvalidArg, "must provide a valid runtime spec to create container")
}
@ -356,7 +356,7 @@ func newContainer(rspec *spec.Spec, logDir string) (*Container, error) {
ctr.config.CreatedTime = time.Now()
// Path our lock file will reside at
lockPath := filepath.Join(logDir, ctr.config.ID)
lockPath := filepath.Join(lockDir, ctr.config.ID)
// Ensure there is no conflict - file does not exist
_, err := os.Stat(lockPath)
if err == nil || !os.IsNotExist(err) {

13
libpod/runtime.go
View File

@ -25,7 +25,7 @@ type Runtime struct {
storageService *storageService
imageContext *types.SystemContext
ociRuntime *OCIRuntime
locksDir string
lockDir string
valid bool
lock sync.RWMutex
}
@ -138,15 +138,15 @@ func NewRuntime(options ...RuntimeOption) (runtime *Runtime, err error) {
}
// Make a directory to hold container lockfiles
lockPath := filepath.Join(runtime.config.StaticDir, "lock")
if err := os.MkdirAll(lockPath, 0755); err != nil {
lockDir := filepath.Join(runtime.config.StaticDir, "lock")
if err := os.MkdirAll(lockDir, 0755); err != nil {
// The directory is allowed to exist
if !os.IsExist(err) {
return nil, errors.Wrapf(err, "error creating runtime lockfiles directory %s",
lockPath)
lockDir)
}
}
runtime.locksDir = lockPath
runtime.lockDir = lockDir
// Make the per-boot files directory if it does not exist
if err := os.MkdirAll(runtime.config.TmpDir, 0755); err != nil {
@ -166,7 +166,6 @@ func NewRuntime(options ...RuntimeOption) (runtime *Runtime, err error) {
runtime.state = state
} else {
dbPath := filepath.Join(runtime.config.StaticDir, "state.sql")
lockPath := filepath.Join(runtime.config.TmpDir, "state.lck")
specsDir := filepath.Join(runtime.config.StaticDir, "ocispec")
// Make a directory to hold JSON versions of container OCI specs
@ -178,7 +177,7 @@ func NewRuntime(options ...RuntimeOption) (runtime *Runtime, err error) {
}
}
state, err := NewSQLState(dbPath, lockPath, specsDir, runtime.locksDir, runtime)
state, err := NewSQLState(dbPath, specsDir, runtime.lockDir, runtime)
if err != nil {
return nil, err
}

2
libpod/runtime_ctr.go
View File

@ -30,7 +30,7 @@ func (r *Runtime) NewContainer(spec *spec.Spec, options ...CtrCreateOption) (c *
return nil, ErrRuntimeStopped
}
ctr, err := newContainer(spec, r.locksDir)
ctr, err := newContainer(spec, r.lockDir)
if err != nil {
return nil, err
}

41
libpod/sql_state.go
View File

@ -6,7 +6,6 @@ import (
"io/ioutil"
"os"
"github.com/containers/storage"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
@ -22,25 +21,17 @@ const DBSchema = 2
type SQLState struct {
db *sql.DB
specsDir string
locksDir string
lockDir string
runtime *Runtime
lock storage.Locker
valid bool
}
// NewSQLState initializes a SQL-backed state, created the database if necessary
func NewSQLState(dbPath, lockPath, specsDir, locksDir string, runtime *Runtime) (State, error) {
func NewSQLState(dbPath, specsDir, lockDir string, runtime *Runtime) (State, error) {
state := new(SQLState)
state.runtime = runtime
// Make our lock file
lock, err := storage.GetLockfile(lockPath)
if err != nil {
return nil, errors.Wrapf(err, "error creating lockfile for state")
}
state.lock = lock
// Make the directory that will hold JSON copies of container runtime specs
if err := os.MkdirAll(specsDir, 0750); err != nil {
// The directory is allowed to exist
@ -51,17 +42,13 @@ func NewSQLState(dbPath, lockPath, specsDir, locksDir string, runtime *Runtime)
state.specsDir = specsDir
// Make the directory that will hold container lockfiles
if err := os.MkdirAll(locksDir, 0750); err != nil {
if err := os.MkdirAll(lockDir, 0750); err != nil {
// The directory is allowed to exist
if !os.IsExist(err) {
return nil, errors.Wrapf(err, "error creating lockfiles dir %s", locksDir)
return nil, errors.Wrapf(err, "error creating lockfiles dir %s", lockDir)
}
}
state.locksDir = locksDir
// Acquire the lock while we open the database and perform initial setup
state.lock.Lock()
defer state.lock.Unlock()
state.lockDir = lockDir
// TODO add a separate temporary database for per-boot container
// state
@ -97,9 +84,6 @@ func NewSQLState(dbPath, lockPath, specsDir, locksDir string, runtime *Runtime)
// Close the state's database connection
func (s *SQLState) Close() error {
s.lock.Lock()
defer s.lock.Unlock()
if !s.valid {
return ErrDBClosed
}
@ -140,7 +124,7 @@ func (s *SQLState) Container(id string) (*Container, error) {
row := s.db.QueryRow(query, id)
ctr, err := ctrFromScannable(row, s.runtime, s.specsDir, s.locksDir)
ctr, err := ctrFromScannable(row, s.runtime, s.specsDir, s.lockDir)
if err != nil {
return nil, errors.Wrapf(err, "error retrieving container %s from database", id)
}
@ -187,7 +171,7 @@ func (s *SQLState) LookupContainer(idOrName string) (*Container, error) {
}
var err error
ctr, err = ctrFromScannable(rows, s.runtime, s.specsDir, s.locksDir)
ctr, err = ctrFromScannable(rows, s.runtime, s.specsDir, s.lockDir)
if err != nil {
return nil, errors.Wrapf(err, "error retrieving container %s from database", idOrName)
}
@ -260,9 +244,6 @@ func (s *SQLState) AddContainer(ctr *Container) (err error) {
return errors.Wrapf(err, "error marshaling container %s labels to JSON", ctr.ID())
}
s.lock.Lock()
defer s.lock.Unlock()
tx, err := s.db.Begin()
if err != nil {
return errors.Wrapf(err, "error beginning database transaction")
@ -441,9 +422,6 @@ func (s *SQLState) SaveContainer(ctr *Container) error {
Pid=?
WHERE Id=?;`
s.lock.Lock()
defer s.lock.Unlock()
if !s.valid {
return ErrDBClosed
}
@ -501,9 +479,6 @@ func (s *SQLState) RemoveContainer(ctr *Container) error {
removeState = "DELETE FROM containerState WHERE ID=?;"
)
s.lock.Lock()
defer s.lock.Unlock()
if !s.valid {
return ErrDBClosed
}
@ -586,7 +561,7 @@ func (s *SQLState) AllContainers() ([]*Container, error) {
containers := []*Container{}
for rows.Next() {
ctr, err := ctrFromScannable(rows, s.runtime, s.specsDir, s.locksDir)
ctr, err := ctrFromScannable(rows, s.runtime, s.specsDir, s.lockDir)
if err != nil {
return nil, err
}

4
libpod/sql_state_internal.go
View File

@ -268,7 +268,7 @@ type scannable interface {
}
// Read a single container from a single row result in the database
func ctrFromScannable(row scannable, runtime *Runtime, specsDir string, locksDir string) (*Container, error) {
func ctrFromScannable(row scannable, runtime *Runtime, specsDir string, lockDir string) (*Container, error) {
var (
id string
name string
@ -387,7 +387,7 @@ func ctrFromScannable(row scannable, runtime *Runtime, specsDir string, locksDir
ctr.runtime = runtime
// Ensure the lockfile exists
lockPath := filepath.Join(locksDir, id)
lockPath := filepath.Join(lockDir, id)
_, err = os.Stat(lockPath)
if err != nil {
return nil, errors.Wrapf(err, "error performing stat on container %s lockfile", id)