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Merge pull request #6499 from hashicorp/f-nomad-monitor
Nomad Monitor
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Original file line number | Diff line number | Diff line change |
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package client | ||
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import ( | ||
"bytes" | ||
"context" | ||
"errors" | ||
"io" | ||
"time" | ||
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"github.com/hashicorp/nomad/command/agent/monitor" | ||
"github.com/hashicorp/nomad/helper" | ||
"github.com/hashicorp/nomad/nomad/structs" | ||
"github.com/ugorji/go/codec" | ||
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metrics "github.com/armon/go-metrics" | ||
log "github.com/hashicorp/go-hclog" | ||
sframer "github.com/hashicorp/nomad/client/lib/streamframer" | ||
cstructs "github.com/hashicorp/nomad/client/structs" | ||
) | ||
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type Agent struct { | ||
c *Client | ||
} | ||
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func NewAgentEndpoint(c *Client) *Agent { | ||
m := &Agent{c: c} | ||
m.c.streamingRpcs.Register("Agent.Monitor", m.monitor) | ||
return m | ||
} | ||
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func (m *Agent) monitor(conn io.ReadWriteCloser) { | ||
defer metrics.MeasureSince([]string{"client", "agent", "monitor"}, time.Now()) | ||
defer conn.Close() | ||
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// Decode arguments | ||
var args cstructs.MonitorRequest | ||
decoder := codec.NewDecoder(conn, structs.MsgpackHandle) | ||
encoder := codec.NewEncoder(conn, structs.MsgpackHandle) | ||
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if err := decoder.Decode(&args); err != nil { | ||
handleStreamResultError(err, helper.Int64ToPtr(500), encoder) | ||
return | ||
} | ||
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// Check acl | ||
if aclObj, err := m.c.ResolveToken(args.AuthToken); err != nil { | ||
handleStreamResultError(err, helper.Int64ToPtr(403), encoder) | ||
return | ||
} else if aclObj != nil && !aclObj.AllowAgentRead() { | ||
handleStreamResultError(structs.ErrPermissionDenied, helper.Int64ToPtr(403), encoder) | ||
return | ||
} | ||
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logLevel := log.LevelFromString(args.LogLevel) | ||
if args.LogLevel == "" { | ||
logLevel = log.LevelFromString("INFO") | ||
} | ||
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if logLevel == log.NoLevel { | ||
handleStreamResultError(errors.New("Unknown log level"), helper.Int64ToPtr(400), encoder) | ||
return | ||
} | ||
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ctx, cancel := context.WithCancel(context.Background()) | ||
defer cancel() | ||
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monitor := monitor.New(512, m.c.logger, &log.LoggerOptions{ | ||
JSONFormat: args.LogJSON, | ||
Level: logLevel, | ||
}) | ||
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frames := make(chan *sframer.StreamFrame, streamFramesBuffer) | ||
errCh := make(chan error) | ||
var buf bytes.Buffer | ||
frameCodec := codec.NewEncoder(&buf, structs.JsonHandle) | ||
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framer := sframer.NewStreamFramer(frames, 1*time.Second, 200*time.Millisecond, 1024) | ||
framer.Run() | ||
defer framer.Destroy() | ||
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// goroutine to detect remote side closing | ||
go func() { | ||
if _, err := conn.Read(nil); err != nil { | ||
// One end of the pipe explicitly closed, exit | ||
cancel() | ||
return | ||
} | ||
select { | ||
case <-ctx.Done(): | ||
return | ||
} | ||
}() | ||
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logCh := monitor.Start() | ||
defer monitor.Stop() | ||
initialOffset := int64(0) | ||
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// receive logs and build frames | ||
go func() { | ||
defer framer.Destroy() | ||
LOOP: | ||
for { | ||
select { | ||
case log := <-logCh: | ||
if err := framer.Send("", "log", log, initialOffset); err != nil { | ||
select { | ||
case errCh <- err: | ||
case <-ctx.Done(): | ||
} | ||
break LOOP | ||
} | ||
case <-ctx.Done(): | ||
break LOOP | ||
} | ||
} | ||
}() | ||
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var streamErr error | ||
OUTER: | ||
for { | ||
select { | ||
case frame, ok := <-frames: | ||
if !ok { | ||
// frame may have been closed when an error | ||
// occurred. Check once more for an error. | ||
select { | ||
case streamErr = <-errCh: | ||
// There was a pending error! | ||
default: | ||
// No error, continue on | ||
} | ||
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break OUTER | ||
} | ||
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var resp cstructs.StreamErrWrapper | ||
if args.PlainText { | ||
resp.Payload = frame.Data | ||
} else { | ||
if err := frameCodec.Encode(frame); err != nil { | ||
streamErr = err | ||
break OUTER | ||
} | ||
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resp.Payload = buf.Bytes() | ||
buf.Reset() | ||
} | ||
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if err := encoder.Encode(resp); err != nil { | ||
streamErr = err | ||
break OUTER | ||
} | ||
encoder.Reset(conn) | ||
case <-ctx.Done(): | ||
break OUTER | ||
} | ||
} | ||
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if streamErr != nil { | ||
handleStreamResultError(streamErr, helper.Int64ToPtr(500), encoder) | ||
return | ||
} | ||
} |
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