micro/debug/service/handler/debug.go
2020-01-24 21:32:07 +00:00

163 lines
3.5 KiB
Go

// Package handler implements service debug handler embedded in go-micro services
package handler
import (
"context"
"time"
"github.com/micro/go-micro/debug/log"
proto "github.com/micro/go-micro/debug/service/proto"
"github.com/micro/go-micro/debug/stats"
"github.com/micro/go-micro/debug/trace"
"github.com/micro/go-micro/server"
)
var (
// DefaultHandler is default debug handler
DefaultHandler = newDebug()
)
type Debug struct {
// must honour the debug handler
proto.DebugHandler
// the logger for retrieving logs
log log.Log
// the stats collector
stats stats.Stats
// the tracer
trace trace.Trace
}
func newDebug() *Debug {
return &Debug{
log: log.DefaultLog,
stats: stats.DefaultStats,
trace: trace.DefaultTrace,
}
}
func (d *Debug) Health(ctx context.Context, req *proto.HealthRequest, rsp *proto.HealthResponse) error {
rsp.Status = "ok"
return nil
}
func (d *Debug) Stats(ctx context.Context, req *proto.StatsRequest, rsp *proto.StatsResponse) error {
stats, err := d.stats.Read()
if err != nil {
return err
}
if len(stats) == 0 {
return nil
}
// write the response values
rsp.Timestamp = uint64(stats[0].Timestamp)
rsp.Started = uint64(stats[0].Started)
rsp.Uptime = uint64(stats[0].Uptime)
rsp.Memory = stats[0].Memory
rsp.Gc = stats[0].GC
rsp.Threads = stats[0].Threads
rsp.Requests = stats[0].Requests
rsp.Errors = stats[0].Errors
return nil
}
func (d *Debug) Trace(ctx context.Context, req *proto.TraceRequest, rsp *proto.TraceResponse) error {
traces, err := d.trace.Read(trace.ReadTrace(req.Id))
if err != nil {
return err
}
for _, trace := range traces {
rsp.Spans = append(rsp.Spans, &proto.Span{
Trace: trace.Trace,
Id: trace.Id,
Parent: trace.Parent,
Name: trace.Name,
Started: uint64(trace.Started.UnixNano()),
Duration: uint64(trace.Duration.Nanoseconds()),
Metadata: trace.Metadata,
})
}
return nil
}
func (d *Debug) Log(ctx context.Context, stream server.Stream) error {
req := new(proto.LogRequest)
if err := stream.Recv(req); err != nil {
return err
}
var options []log.ReadOption
since := time.Unix(req.Since, 0)
if !since.IsZero() {
options = append(options, log.Since(since))
}
count := int(req.Count)
if count > 0 {
options = append(options, log.Count(count))
}
if req.Stream {
// TODO: we need to figure out how to close the log stream
// It seems like when a client disconnects,
// the connection stays open until some timeout expires
// or something like that; that means the map of streams
// might end up leaking memory if not cleaned up properly
lgStream, err := d.log.Stream()
if err != nil {
return err
}
defer lgStream.Stop()
for record := range lgStream.Chan() {
// copy metadata
metadata := make(map[string]string)
for k, v := range record.Metadata {
metadata[k] = v
}
// send record
if err := stream.Send(&proto.Record{
Timestamp: record.Timestamp.Unix(),
Message: record.Message.(string),
Metadata: metadata,
}); err != nil {
return err
}
}
// done streaming, return
return nil
}
// get the log records
records, err := d.log.Read(options...)
if err != nil {
return err
}
// send all the logs downstream
for _, record := range records {
// copy metadata
metadata := make(map[string]string)
for k, v := range record.Metadata {
metadata[k] = v
}
// send record
if err := stream.Send(&proto.Record{
Timestamp: record.Timestamp.Unix(),
Message: record.Message.(string),
Metadata: metadata,
}); err != nil {
return err
}
}
return nil
}