418 lines
10 KiB
Go
418 lines
10 KiB
Go
package client
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import (
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"bytes"
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"fmt"
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"sync"
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"time"
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"github.com/micro/go-micro/broker"
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"github.com/micro/go-micro/codec"
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"github.com/micro/go-micro/errors"
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"github.com/micro/go-micro/metadata"
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"github.com/micro/go-micro/selector"
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"github.com/micro/go-micro/transport"
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"golang.org/x/net/context"
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)
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type rpcClient struct {
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once sync.Once
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opts Options
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}
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func newRpcClient(opt ...Option) Client {
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var once sync.Once
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opts := newOptions(opt...)
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rc := &rpcClient{
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once: once,
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opts: opts,
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}
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c := Client(rc)
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// wrap in reverse
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for i := len(opts.Wrappers); i > 0; i-- {
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c = opts.Wrappers[i-1](c)
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}
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return c
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}
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func (r *rpcClient) newCodec(contentType string) (codec.NewCodec, error) {
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if c, ok := r.opts.Codecs[contentType]; ok {
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return c, 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, fmt.Errorf("Unsupported Content-Type: %s", contentType)
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}
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func (r *rpcClient) call(ctx context.Context, address string, req Request, resp interface{}, opts CallOptions) error {
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msg := &transport.Message{
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Header: make(map[string]string),
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}
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md, ok := metadata.FromContext(ctx)
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if ok {
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for k, v := range md {
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msg.Header[k] = v
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}
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}
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// set timeout in nanoseconds
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msg.Header["Timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
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// set the content type for the request
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msg.Header["Content-Type"] = req.ContentType()
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cf, err := r.newCodec(req.ContentType())
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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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c, err := r.opts.Transport.Dial(address, transport.WithTimeout(opts.DialTimeout))
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if err != nil {
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return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
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}
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stream := &rpcStream{
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context: ctx,
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request: req,
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closed: make(chan bool),
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codec: newRpcPlusCodec(msg, c, cf),
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}
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defer stream.Close()
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ch := make(chan error, 1)
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go func() {
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// send request
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if err := stream.Send(req.Request()); err != nil {
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ch <- err
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return
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}
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// recv request
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if err := stream.Recv(resp); err != nil {
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ch <- err
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return
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}
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// success
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ch <- nil
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}()
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select {
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case err := <-ch:
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return err
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case <-ctx.Done():
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return errors.New("go.micro.client", ctx.Err(), 408)
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}
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}
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func (r *rpcClient) stream(ctx context.Context, address string, req Request, opts CallOptions) (Streamer, error) {
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msg := &transport.Message{
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Header: make(map[string]string),
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}
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md, ok := metadata.FromContext(ctx)
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if ok {
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for k, v := range md {
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msg.Header[k] = v
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}
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}
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// set timeout in nanoseconds
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msg.Header["Timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
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// set the content type for the request
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msg.Header["Content-Type"] = req.ContentType()
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cf, err := r.newCodec(req.ContentType())
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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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c, err := r.opts.Transport.Dial(address, transport.WithStream(), transport.WithTimeout(opts.DialTimeout))
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if err != nil {
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return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
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}
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stream := &rpcStream{
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context: ctx,
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request: req,
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closed: make(chan bool),
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codec: newRpcPlusCodec(msg, c, cf),
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}
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ch := make(chan error, 1)
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go func() {
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ch <- stream.Send(req.Request())
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}()
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var grr error
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select {
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case err := <-ch:
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grr = err
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case <-ctx.Done():
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grr = errors.New("go.micro.client", ctx.Err(), 408)
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}
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if grr != nil {
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stream.Close()
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return nil, grr
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}
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return stream, nil
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}
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func (r *rpcClient) Init(opts ...Option) error {
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for _, o := range opts {
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o(&r.opts)
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}
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return nil
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}
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func (r *rpcClient) Options() Options {
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return r.opts
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}
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func (r *rpcClient) CallRemote(ctx context.Context, address string, request Request, response interface{}, opts ...CallOption) error {
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// make a copy of call opts
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callOpts := r.opts.CallOptions
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for _, opt := range opts {
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opt(&callOpts)
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}
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return r.call(ctx, address, request, response, callOpts)
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}
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func (r *rpcClient) Call(ctx context.Context, request Request, response interface{}, opts ...CallOption) error {
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// make a copy of call opts
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callOpts := r.opts.CallOptions
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for _, opt := range opts {
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opt(&callOpts)
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}
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// get next nodes from the selector
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next, err := r.opts.Selector.Select(request.Service(), callOpts.SelectOptions...)
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if err != nil && err == selector.ErrNotFound {
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return errors.NotFound("go.micro.client", err.Error())
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} else if err != nil {
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return errors.InternalServerError("go.micro.client", err.Error())
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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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// no deadline so we create a new one
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ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
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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 := WithRequestTimeout(d.Sub(time.Now()))
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opt(&callOpts)
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}
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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, request, 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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// select next node
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node, err := next()
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if err != nil && err == selector.ErrNotFound {
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return errors.NotFound("go.micro.client", err.Error())
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} else if err != nil {
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return errors.InternalServerError("go.micro.client", err.Error())
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}
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// set the address
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address := node.Address
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if node.Port > 0 {
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address = fmt.Sprintf("%s:%d", address, node.Port)
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}
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// make the call
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err = r.call(ctx, address, request, response, callOpts)
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r.opts.Selector.Mark(request.Service(), node, err)
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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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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", 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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gerr = err
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}
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}
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return gerr
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}
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func (r *rpcClient) StreamRemote(ctx context.Context, address string, request Request, opts ...CallOption) (Streamer, error) {
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// make a copy of call opts
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callOpts := r.opts.CallOptions
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for _, opt := range opts {
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opt(&callOpts)
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}
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return r.stream(ctx, address, request, callOpts)
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}
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func (r *rpcClient) Stream(ctx context.Context, request Request, opts ...CallOption) (Streamer, error) {
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// make a copy of call opts
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callOpts := r.opts.CallOptions
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for _, opt := range opts {
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opt(&callOpts)
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}
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// get next nodes from the selector
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next, err := r.opts.Selector.Select(request.Service(), callOpts.SelectOptions...)
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if err != nil && err == selector.ErrNotFound {
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return nil, errors.NotFound("go.micro.client", err.Error())
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} else if err != nil {
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return nil, errors.InternalServerError("go.micro.client", err.Error())
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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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// no deadline so we create a new one
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ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
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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 := WithRequestTimeout(d.Sub(time.Now()))
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opt(&callOpts)
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}
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call := func(i int) (Streamer, error) {
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// call backoff first. Someone may want an initial start delay
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t, err := callOpts.Backoff(ctx, request, i)
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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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// 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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node, err := next()
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if err != nil && err == selector.ErrNotFound {
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return nil, errors.NotFound("go.micro.client", err.Error())
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} else if err != nil {
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return nil, errors.InternalServerError("go.micro.client", err.Error())
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}
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address := node.Address
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if node.Port > 0 {
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address = fmt.Sprintf("%s:%d", address, node.Port)
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}
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stream, err := r.stream(ctx, address, request, callOpts)
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r.opts.Selector.Mark(request.Service(), node, err)
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return stream, err
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}
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type response struct {
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stream Streamer
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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, err := call(i)
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ch <- response{s, err}
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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", 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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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 (r *rpcClient) Publish(ctx context.Context, p Publication, opts ...PublishOption) error {
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md, ok := metadata.FromContext(ctx)
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if !ok {
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md = make(map[string]string)
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}
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md["Content-Type"] = p.ContentType()
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// encode message body
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cf, err := r.newCodec(p.ContentType())
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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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b := &buffer{bytes.NewBuffer(nil)}
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if err := cf(b).Write(&codec.Message{Type: codec.Publication}, p.Message()); err != nil {
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return errors.InternalServerError("go.micro.client", err.Error())
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}
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r.once.Do(func() {
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r.opts.Broker.Connect()
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})
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return r.opts.Broker.Publish(p.Topic(), &broker.Message{
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Header: md,
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Body: b.Bytes(),
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})
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}
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func (r *rpcClient) NewPublication(topic string, message interface{}) Publication {
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return newRpcPublication(topic, message, r.opts.ContentType)
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}
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func (r *rpcClient) NewProtoPublication(topic string, message interface{}) Publication {
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return newRpcPublication(topic, message, "application/octet-stream")
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}
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func (r *rpcClient) NewRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
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return newRpcRequest(service, method, request, r.opts.ContentType, reqOpts...)
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}
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func (r *rpcClient) NewProtoRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
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return newRpcRequest(service, method, request, "application/octet-stream", reqOpts...)
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}
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func (r *rpcClient) NewJsonRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
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return newRpcRequest(service, method, request, "application/json", reqOpts...)
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}
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func (r *rpcClient) String() string {
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return "rpc"
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}
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