[#2] Remove panic from RPCs

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

client/accounting.go

@@ -46,7 +46,7 @@ func (x ResBalanceGet) Amount() accounting.Decimal {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmBalanceGet docs).
+// Returns an error if parameters are set incorrectly (see PrmBalanceGet docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -54,9 +54,9 @@ func (x ResBalanceGet) Amount() accounting.Decimal {
 func (c *Client) BalanceGet(ctx context.Context, prm PrmBalanceGet) (*ResBalanceGet, error) {
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.accountSet:
-		panic("account not set")
+		return nil, errorAccountNotSet
 	}
 
 	// form request body

client/client.go

@@ -69,7 +69,7 @@ func (c *Client) Init(prm PrmInit) {
 // argument, otherwise context.Background() is used. Dial returns context
 // errors, see context package docs for details.
 //
-// Panics if required parameters are set incorrectly, look carefully
+// 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.
@@ -78,12 +78,12 @@ func (c *Client) Init(prm PrmInit) {
 // See also Init / Close.
 func (c *Client) Dial(prm PrmDial) error {
 	if prm.endpoint == "" {
-		panic("server address is unset or empty")
+		return errorServerAddrUnset
 	}
 
 	if prm.timeoutDialSet {
 		if prm.timeoutDial <= 0 {
-			panic("non-positive timeout")
+			return errorNonPositiveTimeout
 		}
 	} else {
 		prm.timeoutDial = 5 * time.Second
@@ -91,7 +91,7 @@ func (c *Client) Dial(prm PrmDial) error {
 
 	if prm.streamTimeoutSet {
 		if prm.streamTimeout <= 0 {
-			panic("non-positive timeout")
+			return errorNonPositiveTimeout
 		}
 	} else {
 		prm.streamTimeout = 10 * time.Second

client/common.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"crypto/ecdsa"
+	"errors"
 	"fmt"
 
 	"github.com/TrueCloudLab/frostfs-api-go/v2/refs"
@@ -70,11 +71,21 @@ func writeXHeadersToMeta(xHeaders []string, h *v2session.RequestMetaHeader) {
 	h.SetXHeaders(hs)
 }
 
-// panic messages.
+// error messages.
-const (
+var (
-	panicMsgMissingContext   = "missing context"
+	errorMissingContext       = errors.New("missing context")
-	panicMsgMissingContainer = "missing container"
+	errorMissingContainer     = errors.New("missing container")
-	panicMsgMissingObject    = "missing object"
+	errorMissingObject        = errors.New("missing object")
+	errorAccountNotSet        = errors.New("account not set")
+	errorServerAddrUnset      = errors.New("server address is unset or empty")
+	errorNonPositiveTimeout   = errors.New("non-positive timeout")
+	errorEACLTableNotSet      = errors.New("eACL table not set")
+	errorMissingAnnouncements = errors.New("missing announcements")
+	errorZeroRangeLength      = errors.New("zero range length")
+	errorMissingRanges        = errors.New("missing ranges")
+	errorZeroEpoch            = errors.New("zero epoch")
+	errorMissingTrusts        = errors.New("missing trusts")
+	errorTrustNotSet          = errors.New("current trust value not set")
 )
 
 // groups all the details required to send a single request and process a response to it.

client/container.go

@@ -77,7 +77,7 @@ func (x ResContainerPut) ID() cid.ID {
 //
 // Success can be verified by reading by identifier (see ResContainerPut.ID).
 //
-// Immediately panics if parameters are set incorrectly (see PrmContainerPut docs).
+// Returns an error if parameters are set incorrectly (see PrmContainerPut docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -86,9 +86,9 @@ func (c *Client) ContainerPut(ctx context.Context, prm PrmContainerPut) (*ResCon
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.cnrSet:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	}
 
 	// TODO: check private key is set before forming the request
@@ -204,7 +204,7 @@ func (x ResContainerGet) Container() container.Container {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmContainerGet docs).
+// Returns an error if parameters are set incorrectly (see PrmContainerGet docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -213,9 +213,9 @@ func (x ResContainerGet) Container() container.Container {
 func (c *Client) ContainerGet(ctx context.Context, prm PrmContainerGet) (*ResContainerGet, error) {
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.idSet:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	}
 
 	var cidV2 refs.ContainerID
@@ -304,7 +304,7 @@ func (x ResContainerList) Containers() []cid.ID {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmContainerList docs).
+// Returns an error if parameters are set incorrectly (see PrmContainerList docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -313,9 +313,9 @@ func (c *Client) ContainerList(ctx context.Context, prm PrmContainerList) (*ResC
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.ownerSet:
-		panic("account not set")
+		return nil, errorAccountNotSet
 	}
 
 	// form request body
@@ -413,7 +413,7 @@ type ResContainerDelete struct {
 //
 // Success can be verified by reading by identifier (see GetContainer).
 //
-// Immediately panics if parameters are set incorrectly (see PrmContainerDelete docs).
+// Returns an error if parameters are set incorrectly (see PrmContainerDelete docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Exactly one return value is non-nil. Server status return is returned in ResContainerDelete.
@@ -425,9 +425,9 @@ func (c *Client) ContainerDelete(ctx context.Context, prm PrmContainerDelete) (*
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.idSet:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	}
 
 	// sign container ID
@@ -528,7 +528,7 @@ func (x ResContainerEACL) Table() eacl.Table {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmContainerEACL docs).
+// Returns an error if parameters are set incorrectly (see PrmContainerEACL docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -539,9 +539,9 @@ func (c *Client) ContainerEACL(ctx context.Context, prm PrmContainerEACL) (*ResC
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.idSet:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	}
 
 	var cidV2 refs.ContainerID
@@ -642,7 +642,7 @@ type ResContainerSetEACL struct {
 //
 // Success can be verified by reading by identifier (see EACL).
 //
-// Immediately panics if parameters are set incorrectly (see PrmContainerSetEACL docs).
+// Returns an error if parameters are set incorrectly (see PrmContainerSetEACL docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -651,9 +651,9 @@ func (c *Client) ContainerSetEACL(ctx context.Context, prm PrmContainerSetEACL)
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.tableSet:
-		panic("eACL table not set")
+		return nil, errorEACLTableNotSet
 	}
 
 	// sign the eACL table
@@ -747,7 +747,7 @@ type ResAnnounceSpace struct {
 //
 // At this moment success can not be checked.
 //
-// Immediately panics if parameters are set incorrectly (see PrmAnnounceSpace docs).
+// Returns an error if parameters are set incorrectly (see PrmAnnounceSpace docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -756,9 +756,9 @@ func (c *Client) ContainerAnnounceUsedSpace(ctx context.Context, prm PrmAnnounce
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case len(prm.announcements) == 0:
-		panic("missing announcements")
+		return nil, errorMissingAnnouncements
 	}
 
 	// convert list of SDK announcement structures into FrostFS-API v2 list

client/netmap.go

@@ -47,7 +47,7 @@ func (x ResEndpointInfo) NodeInfo() netmap.NodeInfo {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmEndpointInfo docs).
+// Returns an error if parameters are set incorrectly (see PrmEndpointInfo docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Exactly one return value is non-nil. Server status return is returned in ResEndpointInfo.
@@ -58,7 +58,7 @@ func (x ResEndpointInfo) NodeInfo() netmap.NodeInfo {
 func (c *Client) EndpointInfo(ctx context.Context, prm PrmEndpointInfo) (*ResEndpointInfo, error) {
 	// check context
 	if ctx == nil {
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	}
 
 	// form request
@@ -144,7 +144,7 @@ func (x ResNetworkInfo) Info() netmap.NetworkInfo {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmNetworkInfo docs).
+// Returns an error if parameters are set incorrectly (see PrmNetworkInfo docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Exactly one return value is non-nil. Server status return is returned in ResNetworkInfo.
@@ -155,7 +155,7 @@ func (x ResNetworkInfo) Info() netmap.NetworkInfo {
 func (c *Client) NetworkInfo(ctx context.Context, prm PrmNetworkInfo) (*ResNetworkInfo, error) {
 	// check context
 	if ctx == nil {
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	}
 
 	// form request
@@ -224,6 +224,7 @@ func (x ResNetMapSnapshot) NetMap() netmap.NetMap {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
+// Returns an error if parameters are set incorrectly.
 // Context is required and MUST NOT be nil. It is used for network communication.
 //
 // Exactly one return value is non-nil. Server status return is returned in ResNetMapSnapshot.
@@ -234,7 +235,7 @@ func (x ResNetMapSnapshot) NetMap() netmap.NetMap {
 func (c *Client) NetMapSnapshot(ctx context.Context, _ PrmNetMapSnapshot) (*ResNetMapSnapshot, error) {
 	// check context
 	if ctx == nil {
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	}
 
 	// form request body

client/netmap_test.go

@@ -70,10 +70,9 @@ func TestClient_NetMapSnapshot(t *testing.T) {
 	ctx := context.Background()
 
 	// missing context
-	require.PanicsWithValue(t, panicMsgMissingContext, func() {
 	//nolint:staticcheck
-		_, _ = c.NetMapSnapshot(nil, prm)
+	_, err = c.NetMapSnapshot(nil, prm)
-	})
+	require.ErrorIs(t, err, errorMissingContext, "")
 
 	// request signature
 	srv.errTransport = errors.New("any error")

client/object_delete.go

@@ -114,7 +114,7 @@ func (x ResObjectDelete) Tombstone() oid.ID {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmObjectDelete docs).
+// Returns an error if parameters are set incorrectly (see PrmObjectDelete docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -126,11 +126,11 @@ func (x ResObjectDelete) Tombstone() oid.ID {
 func (c *Client) ObjectDelete(ctx context.Context, prm PrmObjectDelete) (*ResObjectDelete, error) {
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case prm.addr.GetContainerID() == nil:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	case prm.addr.GetObjectID() == nil:
-		panic(panicMsgMissingObject)
+		return nil, errorMissingObject
 	}
 
 	// form request body

client/object_get.go

@@ -296,17 +296,17 @@ func (x *ObjectReader) Read(p []byte) (int, error) {
 // The call only opens the transmission channel, explicit fetching is done using the ObjectReader.
 // Exactly one return value is non-nil. Resulting reader must be finally closed.
 //
-// Immediately panics if parameters are set incorrectly (see PrmObjectGet docs).
+// Returns an error if parameters are set incorrectly (see PrmObjectGet docs).
 // Context is required and must not be nil. It is used for network communication.
 func (c *Client) ObjectGetInit(ctx context.Context, prm PrmObjectGet) (*ObjectReader, error) {
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case prm.addr.GetContainerID() == nil:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	case prm.addr.GetObjectID() == nil:
-		panic(panicMsgMissingObject)
+		return nil, errorMissingObject
 	}
 
 	// form request body
@@ -400,7 +400,7 @@ func (x *ResObjectHead) ReadHeader(dst *object.Object) bool {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmObjectHead docs).
+// Returns an error if parameters are set incorrectly (see PrmObjectHead docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return errors:
@@ -417,11 +417,11 @@ func (x *ResObjectHead) ReadHeader(dst *object.Object) bool {
 func (c *Client) ObjectHead(ctx context.Context, prm PrmObjectHead) (*ResObjectHead, error) {
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case prm.addr.GetContainerID() == nil:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	case prm.addr.GetObjectID() == nil:
-		panic(panicMsgMissingObject)
+		return nil, errorMissingObject
 	}
 
 	var body v2object.HeadRequestBody
@@ -663,19 +663,19 @@ func (x *ObjectRangeReader) Read(p []byte) (int, error) {
 // The call only opens the transmission channel, explicit fetching is done using the ObjectRangeReader.
 // Exactly one return value is non-nil. Resulting reader must be finally closed.
 //
-// Immediately panics if parameters are set incorrectly (see PrmObjectRange docs).
+// Returns an error if parameters are set incorrectly (see PrmObjectRange docs).
 // Context is required and must not be nil. It is used for network communication.
 func (c *Client) ObjectRangeInit(ctx context.Context, prm PrmObjectRange) (*ObjectRangeReader, error) {
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case prm.addr.GetContainerID() == nil:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	case prm.addr.GetObjectID() == nil:
-		panic(panicMsgMissingObject)
+		return nil, errorMissingObject
 	case prm.rng.GetLength() == 0:
-		panic("zero range length")
+		return nil, errorZeroRangeLength
 	}
 
 	// form request body

client/object_hash.go

@@ -154,7 +154,7 @@ func (x ResObjectHash) Checksums() [][]byte {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmObjectHash docs).
+// Returns an error if parameters are set incorrectly (see PrmObjectHash docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -167,13 +167,13 @@ func (x ResObjectHash) Checksums() [][]byte {
 func (c *Client) ObjectHash(ctx context.Context, prm PrmObjectHash) (*ResObjectHash, error) {
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case prm.addr.GetContainerID() == nil:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	case prm.addr.GetObjectID() == nil:
-		panic(panicMsgMissingObject)
+		return nil, errorMissingObject
 	case len(prm.body.GetRanges()) == 0:
-		panic("missing ranges")
+		return nil, errorMissingRanges
 	}
 
 	prm.body.SetAddress(&prm.addr)

client/object_put.go

@@ -235,11 +235,12 @@ func (x *ObjectWriter) Close() (*ResObjectPut, error) {
 // The call only opens the transmission channel, explicit recording is done using the ObjectWriter.
 // Exactly one return value is non-nil. Resulting writer must be finally closed.
 //
+// Returns an error if parameters are set incorrectly.
 // Context is required and must not be nil. It is used for network communication.
 func (c *Client) ObjectPutInit(ctx context.Context, prm PrmObjectPutInit) (*ObjectWriter, error) {
 	// check parameters
 	if ctx == nil {
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	}
 
 	var w ObjectWriter

client/object_search.go

@@ -218,15 +218,15 @@ func (x *ObjectListReader) Close() (*ResObjectSearch, error) {
 // is done using the ObjectListReader. Exactly one return value is non-nil.
 // Resulting reader must be finally closed.
 //
-// Immediately panics if parameters are set incorrectly (see PrmObjectSearch docs).
+// Returns an error if parameters are set incorrectly (see PrmObjectSearch docs).
 // Context is required and must not be nil. It is used for network communication.
 func (c *Client) ObjectSearchInit(ctx context.Context, prm PrmObjectSearch) (*ObjectListReader, error) {
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case !prm.cnrSet:
-		panic(panicMsgMissingContainer)
+		return nil, errorMissingContainer
 	}
 
 	var cidV2 v2refs.ContainerID

client/reputation.go

@@ -45,7 +45,7 @@ type ResAnnounceLocalTrust struct {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmAnnounceLocalTrust docs).
+// Returns an error if parameters are set incorrectly (see PrmAnnounceLocalTrust docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -54,11 +54,11 @@ func (c *Client) AnnounceLocalTrust(ctx context.Context, prm PrmAnnounceLocalTru
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case prm.epoch == 0:
-		panic("zero epoch")
+		return nil, errorZeroEpoch
 	case len(prm.trusts) == 0:
-		panic("missing trusts")
+		return nil, errorMissingTrusts
 	}
 
 	// form request body
@@ -146,7 +146,7 @@ type ResAnnounceIntermediateTrust struct {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmAnnounceIntermediateTrust docs).
+// Returns an error if parameters are set incorrectly (see PrmAnnounceIntermediateTrust docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -155,11 +155,11 @@ func (c *Client) AnnounceIntermediateTrust(ctx context.Context, prm PrmAnnounceI
 	// check parameters
 	switch {
 	case ctx == nil:
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	case prm.epoch == 0:
-		panic("zero epoch")
+		return nil, errorZeroEpoch
 	case !prm.trustSet:
-		panic("current trust value not set")
+		return nil, errorTrustNotSet
 	}
 
 	var trust v2reputation.PeerToPeerTrust

client/session.go

@@ -72,7 +72,7 @@ func (x ResSessionCreate) PublicKey() []byte {
 // FrostFS status codes are returned as `error`, otherwise, are included
 // in the returned result structure.
 //
-// Immediately panics if parameters are set incorrectly (see PrmSessionCreate docs).
+// Returns an error if parameters are set incorrectly (see PrmSessionCreate docs).
 // Context is required and must not be nil. It is used for network communication.
 //
 // Return statuses:
@@ -80,7 +80,7 @@ func (x ResSessionCreate) PublicKey() []byte {
 func (c *Client) SessionCreate(ctx context.Context, prm PrmSessionCreate) (*ResSessionCreate, error) {
 	// check context
 	if ctx == nil {
-		panic(panicMsgMissingContext)
+		return nil, errorMissingContext
 	}
 
 	ownerKey := c.prm.key.PublicKey