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client: call .Endpoints() in dial() in client/v3/client.go instead of accessing cfg.Endpoints directly

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0cdd558361/client/v3/client.go (L299) accesses
endpoints without acquiring lock. Fix it to call Endpoints()

Fix #13201

Signed-off-by: Chao Chen <chaochn@amazon.com>
This commit is contained in:
Yi-Shu Tai 2021-07-08 16:41:31 -07:00 committed by Chao Chen
parent 0fb0045780
commit 055b6d7b19
1 changed files with 13 additions and 10 deletions
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23
clientv3/client.go
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@ -56,7 +56,9 @@ type Client struct {
cfg Config
creds grpccredentials.TransportCredentials
resolver *resolver.EtcdManualResolver
mu *sync.RWMutex
epMu *sync.RWMutex
endpoints []string
ctx context.Context
cancel context.CancelFunc
@ -140,18 +142,18 @@ func (c *Client) Ctx() context.Context { return c.ctx }
// Endpoints lists the registered endpoints for the client.
func (c *Client) Endpoints() []string {
// copy the slice; protect original endpoints from being changed
c.mu.RLock()
defer c.mu.RUnlock()
eps := make([]string, len(c.cfg.Endpoints))
copy(eps, c.cfg.Endpoints)
c.epMu.RLock()
defer c.epMu.RUnlock()
eps := make([]string, len(c.endpoints))
copy(eps, c.endpoints)
return eps
}
// SetEndpoints updates client's endpoints.
func (c *Client) SetEndpoints(eps ...string) {
c.mu.Lock()
defer c.mu.Unlock()
c.cfg.Endpoints = eps
c.epMu.Lock()
defer c.epMu.Unlock()
c.endpoints = eps
c.resolver.SetEndpoints(eps)
}
@ -279,7 +281,7 @@ func (c *Client) dial(creds grpccredentials.TransportCredentials, dopts ...grpc.
defer cancel() // TODO: Is this right for cases where grpc.WithBlock() is not set on the dial options?
}
initialEndpoints := strings.Join(c.cfg.Endpoints, ";")
initialEndpoints := strings.Join(c.Endpoints(), ";")
target := fmt.Sprintf("%s://%p/#initially=[%s]", resolver.Schema, c, initialEndpoints)
conn, err := grpc.DialContext(dctx, target, opts...)
if err != nil {
@ -327,7 +329,7 @@ func newClient(cfg *Config) (*Client, error) {
creds: creds,
ctx: ctx,
cancel: cancel,
mu: new(sync.RWMutex),
epMu: new(sync.RWMutex),
callOpts: defaultCallOpts,
lgMu: new(sync.RWMutex),
}
@ -369,6 +371,7 @@ func newClient(cfg *Config) (*Client, error) {
if len(cfg.Endpoints) < 1 {
return nil, fmt.Errorf("at least one Endpoint must is required in client config")
}
client.SetEndpoints(cfg.Endpoints...)
// Use a provided endpoint target so that for https:// without any tls config given, then
// grpc will assume the certificate server name is the endpoint host.