frostfs-sdk-go/client/common.go

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package client
import (
"crypto/ecdsa"
"fmt"
v2session "github.com/nspcc-dev/neofs-api-go/v2/session"
"github.com/nspcc-dev/neofs-api-go/v2/signature"
apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
"github.com/nspcc-dev/neofs-sdk-go/session"
"github.com/nspcc-dev/neofs-sdk-go/version"
)
// common interface of resulting structures with API status.
type resCommon interface {
setStatus(apistatus.Status)
}
// structure is embedded to all resulting types in order to inherit status-related methods.
type statusRes struct {
st apistatus.Status
}
// setStatus implements resCommon interface method.
func (x *statusRes) setStatus(st apistatus.Status) {
x.st = st
}
// Status returns server's status return.
//
// Use apistatus package functionality to handle the status.
func (x statusRes) Status() apistatus.Status {
return x.st
}
type prmSession struct {
tokenSessionSet bool
tokenSession session.Token
}
// SetSessionToken sets token of the session within which request should be sent.
func (x *prmSession) SetSessionToken(tok session.Token) {
x.tokenSession = tok
x.tokenSessionSet = true
}
func (x prmSession) writeToMetaHeader(meta *v2session.RequestMetaHeader) {
if x.tokenSessionSet {
meta.SetSessionToken(x.tokenSession.ToV2())
}
}
// panic messages.
const (
panicMsgMissingContext = "missing context"
panicMsgMissingContainer = "missing container"
)
// groups all the details required to send a single request and process a response to it.
type contextCall struct {
// ==================================================
// state vars that do not require explicit initialization
// final error to be returned from client method
err error
// received response
resp responseV2
// ==================================================
// shared parameters which are set uniformly on all calls
// request signing key
key ecdsa.PrivateKey
// callback prior to processing the response by the client
callbackResp func(ResponseMetaInfo) error
// if set, protocol errors will be expanded into a final error
resolveAPIFailures bool
// NeoFS network magic
netMagic uint64
// ==================================================
// custom call parameters
// structure of the call result
statusRes resCommon
// request to be signed with a key and sent
req interface {
GetMetaHeader() *v2session.RequestMetaHeader
SetMetaHeader(*v2session.RequestMetaHeader)
SetVerificationHeader(*v2session.RequestVerificationHeader)
}
// function to send a request (unary) and receive a response
call func() (responseV2, error)
// function to send the request (req field)
wReq func() error
// function to recv the response (resp field)
rResp func() error
// function to close the message stream
closer func() error
// function of writing response fields to the resulting structure (optional)
result func(v2 responseV2)
}
// sets needed fields of the request meta header.
func (x contextCall) prepareRequest() {
meta := x.req.GetMetaHeader()
if meta == nil {
meta = new(v2session.RequestMetaHeader)
x.req.SetMetaHeader(meta)
}
if meta.GetTTL() == 0 {
meta.SetTTL(2)
}
if meta.GetVersion() == nil {
meta.SetVersion(version.Current().ToV2())
}
meta.SetNetworkMagic(x.netMagic)
}
// prepares, signs and writes the request. Result means success.
// If failed, contextCall.err contains the reason.
func (x *contextCall) writeRequest() bool {
x.prepareRequest()
x.req.SetVerificationHeader(nil)
// sign the request
x.err = signature.SignServiceMessage(&x.key, x.req)
if x.err != nil {
x.err = fmt.Errorf("sign request: %w", x.err)
return false
}
x.err = x.wReq()
if x.err != nil {
x.err = fmt.Errorf("write request: %w", x.err)
return false
}
return true
}
// performs common actions of response processing and writes any problem as a result status or client error
// (in both cases returns false).
//
// Actions:
// * verify signature (internal);
// * call response callback (internal);
// * unwrap status error (optional).
func (x *contextCall) processResponse() bool {
// call response callback if set
if x.callbackResp != nil {
x.err = x.callbackResp(ResponseMetaInfo{
key: x.resp.GetVerificationHeader().GetBodySignature().GetKey(),
})
if x.err != nil {
x.err = fmt.Errorf("response callback error: %w", x.err)
return false
}
}
// note that we call response callback before signature check since it is expected more lightweight
// while verification needs marshaling
// verify response signature
x.err = signature.VerifyServiceMessage(x.resp)
if x.err != nil {
x.err = fmt.Errorf("invalid response signature: %w", x.err)
return false
}
// get result status
st := apistatus.FromStatusV2(x.resp.GetMetaHeader().GetStatus())
// unwrap unsuccessful status and return it
// as error if client has been configured so
successfulStatus := apistatus.IsSuccessful(st)
if !successfulStatus && x.resolveAPIFailures {
x.err = apistatus.ErrFromStatus(st)
return false
}
x.statusRes.setStatus(st)
return successfulStatus || !x.resolveAPIFailures
}
// reads response (if rResp is set) and processes it. Result means success.
// If failed, contextCall.err contains the reason.
func (x *contextCall) readResponse() bool {
if x.rResp != nil {
x.err = x.rResp()
if x.err != nil {
x.err = fmt.Errorf("read response: %w", x.err)
return false
}
}
return x.processResponse()
}
// closes the message stream (if closer is set) and writes the results (if result is set).
// Return means success. If failed, contextCall.err contains the reason.
func (x *contextCall) close() bool {
if x.closer != nil {
x.err = x.closer()
if x.err != nil {
x.err = fmt.Errorf("close RPC: %w", x.err)
return false
}
}
// write response to resulting structure
if x.result != nil {
x.result(x.resp)
}
return true
}
// goes through all stages of sending a request and processing a response. Returns true if successful.
// If failed, contextCall.err contains the reason.
func (x *contextCall) processCall() bool {
// set request writer
x.wReq = func() error {
var err error
x.resp, err = x.call()
return err
}
// write request
ok := x.writeRequest()
if !ok {
return false
}
// read response
ok = x.readResponse()
if !ok {
return false
}
// close and write response to resulting structure
ok = x.close()
if !ok {
return false
}
return x.err == nil
}
// initializes static cross-call parameters inherited from client.
func (c *Client) initCallContext(ctx *contextCall) {
ctx.key = *c.opts.key
c.initCallContextWithoutKey(ctx)
}
// initializes static cross-call parameters inherited from client except private key.
func (c *Client) initCallContextWithoutKey(ctx *contextCall) {
ctx.resolveAPIFailures = c.opts.parseNeoFSErrors
ctx.callbackResp = c.opts.cbRespInfo
ctx.netMagic = c.opts.netMagic
}