465 lines
10 KiB
Go
465 lines
10 KiB
Go
package client
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import (
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"context"
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"fmt"
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"time"
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"go.unistack.org/micro/v4/codec"
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"go.unistack.org/micro/v4/errors"
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"go.unistack.org/micro/v4/metadata"
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"go.unistack.org/micro/v4/options"
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"go.unistack.org/micro/v4/selector"
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"go.unistack.org/micro/v4/semconv"
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)
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// DefaultCodecs will be used to encode/decode data
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var DefaultCodecs = map[string]codec.Codec{
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"application/octet-stream": codec.NewCodec(),
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}
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type noopClient struct {
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opts Options
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}
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type noopRequest struct {
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body interface{}
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codec codec.Codec
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service string
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method string
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endpoint string
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contentType string
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stream bool
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}
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// NewClient returns new noop client
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func NewClient(opts ...options.Option) Client {
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nc := &noopClient{opts: NewOptions(opts...)}
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// wrap in reverse
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c := Client(nc)
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return c
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}
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func (n *noopClient) Name() string {
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return n.opts.Name
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}
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func (n *noopRequest) Service() string {
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return n.service
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}
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func (n *noopRequest) Method() string {
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return n.method
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}
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func (n *noopRequest) Endpoint() string {
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return n.endpoint
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}
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func (n *noopRequest) ContentType() string {
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return n.contentType
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}
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func (n *noopRequest) Body() interface{} {
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return n.body
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}
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func (n *noopRequest) Codec() codec.Codec {
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return n.codec
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}
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func (n *noopRequest) Stream() bool {
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return n.stream
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}
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type noopResponse struct {
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codec codec.Codec
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header metadata.Metadata
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}
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func (n *noopResponse) Codec() codec.Codec {
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return n.codec
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}
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func (n *noopResponse) Header() metadata.Metadata {
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return n.header
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}
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func (n *noopResponse) Read() ([]byte, error) {
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return nil, nil
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}
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type noopStream struct{}
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func (n *noopStream) Context() context.Context {
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return context.Background()
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}
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func (n *noopStream) Request() Request {
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return &noopRequest{}
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}
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func (n *noopStream) Response() Response {
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return &noopResponse{}
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}
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func (n *noopStream) Send(interface{}) error {
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return nil
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}
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func (n *noopStream) Recv(interface{}) error {
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return nil
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}
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func (n *noopStream) SendMsg(interface{}) error {
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return nil
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}
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func (n *noopStream) RecvMsg(interface{}) error {
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return nil
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}
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func (n *noopStream) Error() error {
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return nil
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}
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func (n *noopStream) Close() error {
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return nil
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}
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func (n *noopStream) CloseSend() error {
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return nil
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}
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func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
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if cf, ok := n.opts.Codecs[contentType]; ok {
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return cf, nil
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}
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if cf, ok := DefaultCodecs[contentType]; ok {
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return cf, nil
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}
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return nil, codec.ErrUnknownContentType
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}
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func (n *noopClient) Init(opts ...options.Option) error {
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for _, o := range opts {
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o(&n.opts)
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}
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return nil
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}
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func (n *noopClient) Options() Options {
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return n.opts
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}
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func (n *noopClient) String() string {
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return "noop"
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}
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func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...options.Option) error {
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// make a copy of call opts
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callOpts := n.opts.CallOptions
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for _, opt := range opts {
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opt(&callOpts)
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}
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// check if we already have a deadline
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d, ok := ctx.Deadline()
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if !ok {
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var cancel context.CancelFunc
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// no deadline so we create a new one
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ctx, cancel = context.WithTimeout(ctx, callOpts.RequestTimeout)
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defer cancel()
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} else {
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// got a deadline so no need to setup context
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// but we need to set the timeout we pass along
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opt := RequestTimeout(time.Until(d))
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opt(&callOpts)
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}
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// should we noop right here?
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select {
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case <-ctx.Done():
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return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
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default:
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}
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// make copy of call method
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hcall := n.call
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// wrap the call in reverse
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for i := len(callOpts.CallWrappers); i > 0; i-- {
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hcall = callOpts.CallWrappers[i-1](hcall)
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}
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// use the router passed as a call option, or fallback to the rpc clients router
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if callOpts.Router == nil {
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callOpts.Router = n.opts.Router
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}
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if callOpts.Selector == nil {
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callOpts.Selector = n.opts.Selector
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}
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// inject proxy address
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// TODO: don't even bother using Lookup/Select in this case
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if len(n.opts.Proxy) > 0 {
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callOpts.Address = []string{n.opts.Proxy}
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}
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var next selector.Next
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// return errors.New("go.micro.client", "request timeout", 408)
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call := func(i int) error {
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// call backoff first. Someone may want an initial start delay
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t, err := callOpts.Backoff(ctx, req, i)
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if err != nil {
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return errors.InternalServerError("go.micro.client", err.Error())
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}
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// only sleep if greater than 0
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if t.Seconds() > 0 {
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time.Sleep(t)
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}
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if next == nil {
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var routes []string
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// lookup the route to send the reques to
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// TODO apply any filtering here
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routes, err = n.opts.Lookup(ctx, req, callOpts)
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if err != nil {
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return errors.InternalServerError("go.micro.client", err.Error())
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}
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// balance the list of nodes
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next, err = callOpts.Selector.Select(routes)
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if err != nil {
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return err
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}
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}
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node := next()
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// make the call
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err = hcall(ctx, node, req, rsp, callOpts)
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// record the result of the call to inform future routing decisions
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if verr := n.opts.Selector.Record(node, err); verr != nil {
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return verr
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}
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// try and transform the error to a go-micro error
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if verr, ok := err.(*errors.Error); ok {
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return verr
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}
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return err
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}
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ch := make(chan error, callOpts.Retries)
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var gerr error
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ts := time.Now()
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endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
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n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Inc()
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for i := 0; i <= callOpts.Retries; i++ {
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go func() {
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ch <- call(i)
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}()
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select {
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case <-ctx.Done():
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return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
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case err := <-ch:
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// if the call succeeded lets bail early
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if err == nil {
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return nil
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}
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retry, rerr := callOpts.Retry(ctx, req, i, err)
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if rerr != nil {
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return rerr
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}
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if !retry {
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return err
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}
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gerr = err
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}
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}
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if gerr != nil {
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n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
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} else {
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n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
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}
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n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Dec()
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te := time.Since(ts)
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n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", endpoint).Update(te.Seconds())
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n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", endpoint).Update(te.Seconds())
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return gerr
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}
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func (n *noopClient) call(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
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return nil
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}
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func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...options.Option) Request {
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return &noopRequest{service: service, endpoint: endpoint}
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}
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func (n *noopClient) Stream(ctx context.Context, req Request, opts ...options.Option) (Stream, error) {
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var err error
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// make a copy of call opts
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callOpts := n.opts.CallOptions
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for _, o := range opts {
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o(&callOpts)
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}
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// check if we already have a deadline
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d, ok := ctx.Deadline()
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if !ok && callOpts.StreamTimeout > time.Duration(0) {
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var cancel context.CancelFunc
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// no deadline so we create a new one
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ctx, cancel = context.WithTimeout(ctx, callOpts.StreamTimeout)
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defer cancel()
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} else {
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// got a deadline so no need to setup context
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// but we need to set the timeout we pass along
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o := StreamTimeout(time.Until(d))
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o(&callOpts)
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}
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// should we noop right here?
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select {
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case <-ctx.Done():
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return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
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default:
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}
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/*
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// make copy of call method
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hstream := h.stream
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// wrap the call in reverse
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for i := len(callOpts.CallWrappers); i > 0; i-- {
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hstream = callOpts.CallWrappers[i-1](hstream)
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}
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*/
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// use the router passed as a call option, or fallback to the rpc clients router
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if callOpts.Router == nil {
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callOpts.Router = n.opts.Router
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}
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if callOpts.Selector == nil {
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callOpts.Selector = n.opts.Selector
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}
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// inject proxy address
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// TODO: don't even bother using Lookup/Select in this case
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if len(n.opts.Proxy) > 0 {
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callOpts.Address = []string{n.opts.Proxy}
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}
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var next selector.Next
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call := func(i int) (Stream, error) {
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// call backoff first. Someone may want an initial start delay
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t, cerr := callOpts.Backoff(ctx, req, i)
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if cerr != nil {
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return nil, errors.InternalServerError("go.micro.client", cerr.Error())
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}
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// only sleep if greater than 0
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if t.Seconds() > 0 {
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time.Sleep(t)
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}
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if next == nil {
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var routes []string
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// lookup the route to send the reques to
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// TODO apply any filtering here
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routes, err = n.opts.Lookup(ctx, req, callOpts)
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if err != nil {
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return nil, errors.InternalServerError("go.micro.client", err.Error())
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}
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// balance the list of nodes
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next, err = callOpts.Selector.Select(routes)
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if err != nil {
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return nil, err
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}
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}
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node := next()
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// ts := time.Now()
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endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
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n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Inc()
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stream, cerr := n.stream(ctx, node, req, callOpts)
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if cerr != nil {
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n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
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} else {
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n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
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}
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// record the result of the call to inform future routing decisions
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if verr := n.opts.Selector.Record(node, cerr); verr != nil {
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return nil, verr
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}
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// try and transform the error to a go-micro error
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if verr, ok := cerr.(*errors.Error); ok {
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return nil, verr
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}
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return stream, cerr
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}
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type response struct {
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stream Stream
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err error
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}
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ch := make(chan response, callOpts.Retries)
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var grr error
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for i := 0; i <= callOpts.Retries; i++ {
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go func() {
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s, cerr := call(i)
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ch <- response{s, cerr}
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}()
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select {
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case <-ctx.Done():
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return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
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case rsp := <-ch:
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// if the call succeeded lets bail early
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if rsp.err == nil {
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return rsp.stream, nil
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}
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retry, rerr := callOpts.Retry(ctx, req, i, err)
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if rerr != nil {
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return nil, rerr
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}
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if !retry {
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return nil, rsp.err
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}
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grr = rsp.err
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}
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}
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return nil, grr
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}
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func (n *noopClient) stream(ctx context.Context, addr string, req Request, opts CallOptions) (*noopStream, error) {
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return &noopStream{}, nil
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}
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