129 lines
3.0 KiB
Go
129 lines
3.0 KiB
Go
package wrapper
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import (
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"context"
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"github.com/micro/go-micro/client"
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"github.com/micro/go-micro/debug/stats"
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"github.com/micro/go-micro/debug/trace"
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"github.com/micro/go-micro/metadata"
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"github.com/micro/go-micro/server"
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)
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type clientWrapper struct {
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client.Client
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headers metadata.Metadata
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}
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type traceWrapper struct {
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client.Client
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name string
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trace trace.Tracer
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}
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var (
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HeaderPrefix = "Micro-"
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)
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func (c *clientWrapper) setHeaders(ctx context.Context) context.Context {
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// copy metadata
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mda, _ := metadata.FromContext(ctx)
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md := metadata.Copy(mda)
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// set headers
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for k, v := range c.headers {
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if _, ok := md[k]; !ok {
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md[k] = v
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}
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}
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return metadata.NewContext(ctx, md)
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}
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func (c *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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ctx = c.setHeaders(ctx)
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return c.Client.Call(ctx, req, rsp, opts...)
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}
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func (c *clientWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
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ctx = c.setHeaders(ctx)
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return c.Client.Stream(ctx, req, opts...)
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}
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func (c *clientWrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
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ctx = c.setHeaders(ctx)
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return c.Client.Publish(ctx, p, opts...)
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}
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func (c *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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newCtx, s := c.trace.Start(ctx, req.Service()+"."+req.Endpoint())
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err := c.Client.Call(newCtx, req, rsp, opts...)
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if err != nil {
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s.Metadata["error"] = err.Error()
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}
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// finish the trace
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c.trace.Finish(s)
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return err
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}
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// FromService wraps a client to inject From-Service header into metadata
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func FromService(name string, c client.Client) client.Client {
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return &clientWrapper{
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c,
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metadata.Metadata{
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HeaderPrefix + "From-Service": name,
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},
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}
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}
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// HandlerStats wraps a server handler to generate request/error stats
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func HandlerStats(stats stats.Stats) server.HandlerWrapper {
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// return a handler wrapper
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return func(h server.HandlerFunc) server.HandlerFunc {
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// return a function that returns a function
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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// execute the handler
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err := h(ctx, req, rsp)
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// record the stats
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stats.Record(err)
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// return the error
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return err
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}
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}
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}
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// TraceCall is a call tracing wrapper
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func TraceCall(name string, t trace.Tracer, c client.Client) client.Client {
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return &traceWrapper{
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name: name,
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trace: t,
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Client: c,
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}
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}
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// TraceHandler wraps a server handler to perform tracing
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func TraceHandler(t trace.Tracer) server.HandlerWrapper {
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// return a handler wrapper
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return func(h server.HandlerFunc) server.HandlerFunc {
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// return a function that returns a function
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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// get the span
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newCtx, s := t.Start(ctx, req.Service()+"."+req.Endpoint())
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err := h(newCtx, req, rsp)
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if err != nil {
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s.Metadata["error"] = err.Error()
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}
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// finish
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t.Finish(s)
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return err
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}
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}
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}
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