From f92fda6239d89e8fb5c275e494c38fce5600ac02 Mon Sep 17 00:00:00 2001
From: Ian Cottrell <iancottrell@google.com>
Date: Wed, 10 Jun 2015 20:35:35 +0100
Subject: Write a capture recieving library call and use it from the capture
 dialog.

This is loosly based on the existing logic, but fundamentally rewritten.

Change-Id: I3d19cf4999601de14af795bee73d16ff07847a56
---
 gapii/capture.go | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 gapii/capture.go

(limited to 'gapii')

diff --git a/gapii/capture.go b/gapii/capture.go
new file mode 100644
index 000000000..ab634a4a1
--- /dev/null
+++ b/gapii/capture.go
@@ -0,0 +1,120 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gapii
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"net"
+	"time"
+
+	"android.googlesource.com/platform/tools/gpu/log"
+)
+
+func closed(s chan struct{}) bool {
+	select {
+	case <-s:
+		return true
+	default:
+		return false
+	}
+}
+
+const messageGap = 1024 * 128
+
+type siSize int64
+
+var formats = []string{
+	"%.0fB",
+	"%.2fKB",
+	"%.2fMB",
+	"%.2fGB",
+	"%.2fTB",
+	"%.2fPB",
+	"%.2fEB",
+}
+
+func (s siSize) String() string {
+	size := float64(s)
+	e := math.Floor(math.Log(size) / math.Log(1000))
+	f := formats[int(e)]
+	v := math.Floor(size/math.Pow(1000, e)*10+0.5) / 10
+	return fmt.Sprintf(f, v)
+}
+
+func capture(logger log.Logger, port int, w io.Writer, stop chan struct{}) (int64, error) {
+	if closed(stop) {
+		return 0, nil
+	}
+	conn, err := net.Dial("tcp", fmt.Sprintf("localhost:%d", port))
+	if err != nil {
+		return 0, err
+	}
+	defer conn.Close()
+	var count, nextMessage siSize
+	for {
+		if closed(stop) {
+			logger.Infof("Stop: %v", count)
+			break
+		}
+		conn.SetReadDeadline(time.Now().Add(time.Millisecond * 100)) // Allow for stop event and UI refreshes.
+		n, err := io.CopyN(w, conn, 1024*64)
+		count += siSize(n)
+		if err == io.EOF {
+			logger.Infof("EOF: %v", count)
+			break
+		}
+		if err != nil {
+			err, isnet := err.(net.Error)
+			if !isnet || (!err.Temporary() && !err.Timeout()) {
+				logger.Infof("Connection error: %v", err)
+				return int64(count), err
+			}
+		}
+		if count > nextMessage {
+			nextMessage = count + messageGap
+			logger.Infof("Capturing: %v", count)
+		}
+	}
+	return int64(count), nil
+}
+
+// Capture opens up the specified port and then waits for a capture to be
+// delivered.
+// It copies the capture into the supplied writer.
+func Capture(logger log.Logger, port int, w io.Writer, stop chan struct{}) (int64, error) {
+	logger.Infof("Waiting for connection to localhost:%d...", port)
+	for {
+		count, err := capture(logger, port, w, stop)
+		if err != nil {
+			return count, err
+		}
+		if count != 0 {
+			return count, nil
+		}
+		// ADB has an annoying tendancy to insta-close forwarded sockets when
+		// there's no application waiting for the connection. Treat this as
+		// another waiting-for-connection case.
+		logger.Infof("Pausing...")
+		select {
+		case <-stop:
+			logger.Infof("Aborted.")
+			return 0, nil
+		case <-time.After(500 * time.Millisecond):
+			logger.Infof("Retry...")
+		}
+	}
+}
-- 
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