frostfs-sdk-go/client/client.go

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package client
import (
"context"
"crypto/ecdsa"
"crypto/tls"
"errors"
"time"
v2accounting "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/accounting"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc"
"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
"google.golang.org/grpc"
)
// Client represents virtual connection to the FrostFS network to communicate
// with FrostFS server using FrostFS API protocol. It is designed to provide
// an abstraction interface from the protocol details of data transfer over
// a network in FrostFS.
//
// Client can be created using simple Go variable declaration. Before starting
// work with the Client, it SHOULD BE correctly initialized (see Init method).
// Before executing the FrostFS operations using the Client, connection to the
// server MUST BE correctly established (see Dial method and pay attention
// to the mandatory parameters). Using the Client before connecting have
// been established can lead to a panic. After the work, the Client SHOULD BE
// closed (see Close method): it frees internal and system resources which were
// allocated for the period of work of the Client. Calling Init/Dial/Close method
// during the communication process step strongly discouraged as it leads to
// undefined behavior.
//
// Each method which produces a FrostFS API call may return a server response.
// Status responses are returned in the result structure, and can be cast
// to built-in error instance (or in the returned error if the client is
// configured accordingly). Certain statuses can be checked using `apistatus`
// and standard `errors` packages. Note that package provides some helper
// functions to work with status returns (e.g. IsErrContainerNotFound).
// All possible responses are documented in methods, however, some may be
// returned from all of them (pay attention to the presence of the pointer sign):
// - *apistatus.ServerInternal on internal server error;
// - *apistatus.NodeUnderMaintenance if a server is under maintenance;
// - *apistatus.SuccessDefaultV2 on default success.
//
// Client MUST NOT be copied by value: use pointer to Client instead.
//
// See client package overview to get some examples.
type Client struct {
prm PrmInit
c client.Client
server frostFSAPIServer
}
// Init brings the Client instance to its initial state.
//
// One-time method call during application init stage (before Dial) is expected.
// Calling multiple times leads to undefined behavior.
//
// See docs of PrmInit methods for details. See also Dial / Close.
func (c *Client) Init(prm PrmInit) {
c.prm = prm
}
// Dial establishes a connection to the server from the FrostFS network.
// Returns an error describing failure reason. If failed, the Client
// SHOULD NOT be used.
//
// Uses the context specified by SetContext if it was called with non-nil
// argument, otherwise context.Background() is used. Dial returns context
// errors, see context package docs for details.
//
// Returns an error if required parameters are set incorrectly, look carefully
// at the method documentation.
//
// One-time method call during application start-up stage (after Init ) is expected.
// Calling multiple times leads to undefined behavior.
//
// See also Init / Close.
func (c *Client) Dial(ctx context.Context, prm PrmDial) error {
if prm.endpoint == "" {
return errorServerAddrUnset
}
if prm.timeoutDialSet {
if prm.timeoutDial <= 0 {
return errorNonPositiveTimeout
}
} else {
prm.timeoutDial = 5 * time.Second
}
if prm.streamTimeoutSet {
if prm.streamTimeout <= 0 {
return errorNonPositiveTimeout
}
} else {
prm.streamTimeout = 10 * time.Second
}
c.c = *client.New(append(
client.WithNetworkURIAddress(prm.endpoint, prm.tlsConfig),
client.WithDialTimeout(prm.timeoutDial),
client.WithRWTimeout(prm.streamTimeout),
client.WithGRPCDialOptions(prm.dialOptions),
)...)
c.setFrostFSAPIServer((*coreServer)(&c.c))
// TODO: (neofs-api-go#382) perform generic dial stage of the client.Client
_, err := rpc.Balance(&c.c, new(v2accounting.BalanceRequest),
client.WithContext(ctx),
)
// return context errors since they signal about dial problem
if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
return err
}
return nil
}
// sets underlying provider of frostFSAPIServer. The method is used for testing as an approach
// to skip Dial stage and override FrostFS API server. MUST NOT be used outside test code.
// In real applications wrapper over git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client
// is statically used.
func (c *Client) setFrostFSAPIServer(server frostFSAPIServer) {
c.server = server
}
// Close closes underlying connection to the FrostFS server. Implements io.Closer.
// MUST NOT be called before successful Dial. Can be called concurrently
// with server operations processing on running goroutines: in this case
// they are likely to fail due to a connection error.
//
// One-time method call during application shutdown stage (after Init and Dial)
// is expected. Calling multiple times leads to undefined behavior.
//
// See also Init / Dial.
func (c *Client) Close() error {
return c.c.Conn().Close()
}
// PrmInit groups initialization parameters of Client instances.
//
// See also Init.
type PrmInit struct {
dontResolveFrostFSErrors bool
key ecdsa.PrivateKey
cbRespInfo func(ResponseMetaInfo) error
netMagic uint64
}
// SetDefaultPrivateKey sets Client private key to be used for the protocol
// communication by default.
//
// Required for operations without custom key parametrization (see corresponding Prm* docs).
func (x *PrmInit) SetDefaultPrivateKey(key ecdsa.PrivateKey) {
x.key = key
}
// DontResolveFrostFSFailures makes the Client to preserve failure statuses of the
// FrostFS protocol only in resulting structure (see corresponding Res* docs).
// These errors are returned from each protocol operation. By default, statuses
// are resolved and returned as a Go built-in errors.
func (x *PrmInit) DontResolveFrostFSFailures() {
x.dontResolveFrostFSErrors = true
}
// SetResponseInfoCallback makes the Client to pass ResponseMetaInfo from each
// FrostFS server response to f. Nil (default) means ignore response meta info.
func (x *PrmInit) SetResponseInfoCallback(f func(ResponseMetaInfo) error) {
x.cbRespInfo = f
}
// PrmDial groups connection parameters for the Client.
//
// See also Dial.
type PrmDial struct {
endpoint string
tlsConfig *tls.Config
timeoutDialSet bool
timeoutDial time.Duration
streamTimeoutSet bool
streamTimeout time.Duration
dialOptions []grpc.DialOption
}
// SetServerURI sets server URI in the FrostFS network.
// Required parameter.
//
// Format of the URI:
//
// [scheme://]host:port
//
// Supported schemes:
//
// grpc
// grpcs
//
// See also SetTLSConfig.
func (x *PrmDial) SetServerURI(endpoint string) {
x.endpoint = endpoint
}
// SetTLSConfig sets tls.Config to open TLS client connection
// to the FrostFS server. Nil (default) means insecure connection.
//
// See also SetServerURI.
func (x *PrmDial) SetTLSConfig(tlsConfig *tls.Config) {
x.tlsConfig = tlsConfig
}
// SetTimeout sets the timeout for connection to be established.
// MUST BE positive. If not called, 5s timeout will be used by default.
func (x *PrmDial) SetTimeout(timeout time.Duration) {
x.timeoutDialSet = true
x.timeoutDial = timeout
}
// SetStreamTimeout sets the timeout for individual operations in streaming RPC.
// MUST BE positive. If not called, 10s timeout will be used by default.
func (x *PrmDial) SetStreamTimeout(timeout time.Duration) {
x.streamTimeoutSet = true
x.streamTimeout = timeout
}
// SetGRPCDialOptions sets the gRPC dial options for new gRPC client connection.
func (x *PrmDial) SetGRPCDialOptions(opts ...grpc.DialOption) {
x.dialOptions = opts
}