func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Streamer, error) {
// make a copy of call opts
callOpts := g.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
// get next nodes from the selector
next, err := g.opts.Selector.Select(req.Service(), callOpts.SelectOptions...)
if err != nil && err == selector.ErrNotFound {
return nil, errors.NotFound("go.micro.client", err.Error())
} else if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
// check if we already have a deadline
d, ok := ctx.Deadline()
if !ok {
// no deadline so we create a new one
ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
} else {
// got a deadline so no need to setup context
// but we need to set the timeout we pass along
opt := client.WithRequestTimeout(d.Sub(time.Now()))
opt(&callOpts)
}
// should we noop right here?
select {
case <-ctx.Done():
return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
default:
}
call := func(i int) (client.Streamer, error) {
// call backoff first. Someone may want an initial start delay
t, err := callOpts.Backoff(ctx, req, i)
if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
// only sleep if greater than 0
if t.Seconds() > 0 {
time.Sleep(t)
}
node, err := next()
if err != nil && err == selector.ErrNotFound {
return nil, errors.NotFound("go.micro.client", err.Error())
} else if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
addr := node.Address
if node.Port > 0 {
addr = fmt.Sprintf("%s:%d", addr, node.Port)
}
stream, err := g.stream(ctx, addr, req, callOpts)
g.opts.Selector.Mark(req.Service(), node, err)
return stream, err
}
type response struct {
stream client.Streamer
err error
}
ch := make(chan response, callOpts.Retries)
var grr error
for i := 0; i < callOpts.Retries; i++ {
go func() {
s, err := call(i)
ch <- response{s, err}
}()
select {
case <-ctx.Done():
return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
case rsp := <-ch:
// if the call succeeded lets bail early
if rsp.err == nil {
return rsp.stream, nil
}
retry, rerr := callOpts.Retry(ctx, req, i, err)
if rerr != nil {
return nil, rerr
}
if !retry {
return nil, rsp.err
}
grr = rsp.err
}
}
return nil, grr
}
func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
// make a copy of call opts
callOpts := g.opts.CallOptions
for _, opt := range opts {
opt(&callOpts)
}
// get next nodes from the selector
next, err := g.opts.Selector.Select(req.Service(), callOpts.SelectOptions...)
if err != nil && err == selector.ErrNotFound {
return errors.NotFound("go.micro.client", err.Error())
} else if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
// check if we already have a deadline
d, ok := ctx.Deadline()
if !ok {
// no deadline so we create a new one
ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
} else {
// got a deadline so no need to setup context
// but we need to set the timeout we pass along
opt := client.WithRequestTimeout(d.Sub(time.Now()))
opt(&callOpts)
}
// should we noop right here?
select {
case <-ctx.Done():
return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
default:
}
// make copy of call method
gcall := g.call
// wrap the call in reverse
for i := len(callOpts.CallWrappers); i > 0; i-- {
gcall = callOpts.CallWrappers[i-1](gcall)
}
// return errors.New("go.micro.client", "request timeout", 408)
call := func(i int) error {
// call backoff first. Someone may want an initial start delay
t, err := callOpts.Backoff(ctx, req, i)
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
// only sleep if greater than 0
if t.Seconds() > 0 {
time.Sleep(t)
}
// select next node
node, err := next()
if err != nil && err == selector.ErrNotFound {
return errors.NotFound("go.micro.client", err.Error())
} else if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
// set the address
addr := node.Address
if node.Port > 0 {
addr = fmt.Sprintf("%s:%d", addr, node.Port)
}
// make the call
err = gcall(ctx, addr, req, rsp, callOpts)
g.opts.Selector.Mark(req.Service(), node, err)
return err
}
ch := make(chan error, callOpts.Retries)
var gerr error
for i := 0; i < callOpts.Retries; i++ {
go func() {
ch <- call(i)
}()
select {
case <-ctx.Done():
return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
case err := <-ch:
// if the call succeeded lets bail early
if err == nil {
return nil
}
retry, rerr := callOpts.Retry(ctx, req, i, err)
if rerr != nil {
return rerr
}
if !retry {
return err
}
gerr = err
}
}
return gerr
}