监控扩展
用户如果需要更详细的打点,例如包大小,或者想要更换其他数据源,例如 influxDB,用户可以根据自己的需求实现 Tracer
接口,并通过 WithTracer
Option 来注入。
// Tracer is executed at the start and finish of an HTTP.
type Tracer interface {
Start(ctx context.Context, c *app.RequestContext) context.Context
Finish(ctx context.Context, c *app.RequestContext)
}
从 ctx 中可以获得 TraceInfo
,进一步的从 TraceInfo
中获取请求耗时、包大小和请求返回的错误信息等,举例:
type ServerTracer struct{
// contain entities which recording metric
}
// Start record the beginning of an RPC invocation.
func (s *ServerTracer) Start(ctx context.Context, _ *app.RequestContext) context.Context {
// do nothing
return ctx
}
// Finish record after receiving the response of server.
func (s *ServerTracer) Finish(ctx context.Context, c *app.RequestContext) {
ti := c.GetTraceInfo()
rpcStart := ti.Stats().GetEvent(stats.HTTPStart)
rpcFinish := ti.Stats().GetEvent(stats.HTTPFinish)
cost := rpcFinish.Time().Sub(rpcStart.Time())
// TODO: record the cost of request
}
最后修改
August 2, 2023
: chore: update readme (#742) (945d264)