options.go

     1  // Copyright 2014 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package driver
    16  
    17  import (
    18  	"bufio"
    19  	"fmt"
    20  	"io"
    21  	"os"
    22  	"strings"
    23  
    24  	"github.com/google/pprof/internal/binutils"
    25  	"github.com/google/pprof/internal/plugin"
    26  	"github.com/google/pprof/internal/symbolizer"
    27  	"github.com/google/pprof/internal/transport"
    28  )
    29  
    30  // setDefaults returns a new plugin.Options with zero fields sets to
    31  // sensible defaults.
    32  func setDefaults(o *plugin.Options) *plugin.Options {
    33  	d := &plugin.Options{}
    34  	if o != nil {
    35  		*d = *o
    36  	}
    37  	if d.Writer == nil {
    38  		d.Writer = oswriter{}
    39  	}
    40  	if d.Flagset == nil {
    41  		d.Flagset = &GoFlags{}
    42  	}
    43  	if d.Obj == nil {
    44  		d.Obj = &binutils.Binutils{}
    45  	}
    46  	if d.UI == nil {
    47  		d.UI = &stdUI{r: bufio.NewReader(os.Stdin)}
    48  	}
    49  	if d.HTTPTransport == nil {
    50  		d.HTTPTransport = transport.New(d.Flagset)
    51  	}
    52  	if d.Sym == nil {
    53  		d.Sym = &symbolizer.Symbolizer{Obj: d.Obj, UI: d.UI, Transport: d.HTTPTransport}
    54  	}
    55  	return d
    56  }
    57  
    58  type stdUI struct {
    59  	r *bufio.Reader
    60  }
    61  
    62  func (ui *stdUI) ReadLine(prompt string) (string, error) {
    63  	os.Stdout.WriteString(prompt)
    64  	return ui.r.ReadString('\n')
    65  }
    66  
    67  func (ui *stdUI) Print(args ...interface{}) {
    68  	ui.fprint(os.Stderr, args)
    69  }
    70  
    71  func (ui *stdUI) PrintErr(args ...interface{}) {
    72  	ui.fprint(os.Stderr, args)
    73  }
    74  
    75  func (ui *stdUI) IsTerminal() bool {
    76  	return false
    77  }
    78  
    79  func (ui *stdUI) WantBrowser() bool {
    80  	return true
    81  }
    82  
    83  func (ui *stdUI) SetAutoComplete(func(string) string) {
    84  }
    85  
    86  func (ui *stdUI) fprint(f *os.File, args []interface{}) {
    87  	text := fmt.Sprint(args...)
    88  	if !strings.HasSuffix(text, "\n") {
    89  		text += "\n"
    90  	}
    91  	f.WriteString(text)
    92  }
    93  
    94  // oswriter implements the Writer interface using a regular file.
    95  type oswriter struct{}
    96  
    97  func (oswriter) Open(name string) (io.WriteCloser, error) {
    98  	f, err := os.Create(name)
    99  	return f, err
   100  }
   101
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