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sqlcipher/tool/GetFile.cs at sqlite-release · feiyangwei/sqlcipher · GitHub
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/*
** 2015 October 7
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C# code to download a single file based on a URI.
*/
using
System
;
using
System
.
ComponentModel
;
using
System
.
Diagnostics
;
using
System
.
IO
;
using
System
.
Net
;
using
System
.
Reflection
;
using
System
.
Runtime
.
InteropServices
;
using
System
.
Threading
;
///////////////////////////////////////////////////////////////////////////////
#region Assembly Metadata
[
assembly
:
AssemblyTitle
(
"GetFile Tool"
)
]
[
assembly
:
AssemblyDescription
(
"Download a single file based on a URI."
)
]
[
assembly
:
AssemblyCompany
(
"SQLite Development Team"
)
]
[
assembly
:
AssemblyProduct
(
"SQLite"
)
]
[
assembly
:
AssemblyCopyright
(
"Public Domain"
)
]
[
assembly
:
ComVisible
(
false
)
]
[
assembly
:
Guid
(
"5c4b3728-1693-4a33-a218-8e6973ca15a6"
)
]
[
assembly
:
AssemblyVersion
(
"1.0.*"
)
]
#if
DEBUG
[
assembly
:
AssemblyConfiguration
(
"Debug"
)
]
#else
[
assembly
:
AssemblyConfiguration
(
"Release"
)
]
#endif
#endregion
///////////////////////////////////////////////////////////////////////////////
namespace
GetFile
{
/// <summary>
/// This enumeration is used to represent all the possible exit codes from
/// this tool.
/// </summary>
internal
enum
ExitCode
{
/// <summary>
/// The file download was a success.
/// </summary>
Success
=
0
,
/// <summary>
/// The command line arguments are missing (i.e. null). Generally,
/// this should not happen.
/// </summary>
MissingArgs
=
1
,
/// <summary>
/// The wrong number of command line arguments was supplied.
/// </summary>
WrongNumArgs
=
2
,
/// <summary>
/// The URI specified on the command line could not be parsed as a
/// supported absolute URI.
/// </summary>
BadUri
=
3
,
/// <summary>
/// The file name portion of the URI specified on the command line
/// could not be extracted from it.
/// </summary>
BadFileName
=
4
,
/// <summary>
/// The temporary directory is either invalid (i.e. null) or does not
/// represent an available directory.
/// </summary>
BadTempPath
=
5
,
/// <summary>
/// An exception was caught in <see cref="Main" />. Generally, this
/// should not happen.
/// </summary>
Exception
=
6
,
/// <summary>
/// The file download was canceled. This tool does not make use of
/// the <see cref="WebClient.CancelAsync" /> method; therefore, this
/// should not happen.
/// </summary>
DownloadCanceled
=
7
,
/// <summary>
/// The file download encountered an error. Further information about
/// this error should be displayed on the console.
/// </summary>
DownloadError
=
8
}
///////////////////////////////////////////////////////////////////////////
internal
static
class
Program
{
#region Private Data
/// <summary>
/// This is used to synchronize multithreaded access to the
/// <see cref="previousPercent" /> and <see cref="exitCode"/>
/// fields.
/// </summary>
private
static
readonly
object
syncRoot
=
new
object
(
)
;
///////////////////////////////////////////////////////////////////////
/// <summary>
/// This event will be signed when the file download has completed,
/// even if the file download itself was canceled or unsuccessful.
/// </summary>
private
static
EventWaitHandle
doneEvent
;
///////////////////////////////////////////////////////////////////////
/// <summary>
/// The previous file download completion percentage seen by the
/// <see cref="DownloadProgressChanged" /> event handler. This value
/// is never decreased, nor is it ever reset to zero.
/// </summary>
private
static
int
previousPercent
=
0
;
///////////////////////////////////////////////////////////////////////
/// <summary>
/// This will be the exit code returned by this tool after the file
/// download completes, successfully or otherwise. This value is only
/// changed by the <see cref="DownloadFileCompleted" /> event handler.
/// </summary>
private
static
ExitCode
exitCode
=
ExitCode
.
Success
;
#endregion
///////////////////////////////////////////////////////////////////////
#region Private Support Methods
/// <summary>
/// This method displays an error message to the console and/or
/// displays the command line usage information for this tool.
/// </summary>
/// <param name="message">
/// The error message to display, if any.
/// </param>
/// <param name="usage">
/// Non-zero to display the command line usage information.
/// </param>
private
static
void
Error
(
string
message
,
bool
usage
)
{
if
(
message
!=
null
)
Console
.
WriteLine
(
message
)
;
string
fileName
=
Path
.
GetFileName
(
Process
.
GetCurrentProcess
(
)
.
MainModule
.
FileName
)
;
Console
.
WriteLine
(
String
.
Format
(
"usage: {0} <uri>"
,
fileName
)
)
;
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// This method attempts to determine the file name portion of the
/// specified URI.
/// </summary>
/// <param name="uri">
/// The URI to process.
/// </param>
/// <returns>
/// The file name portion of the specified URI -OR- null if it cannot
/// be determined.
/// </returns>
private
static
string
GetFileName
(
Uri
uri
)
{
if
(
uri
==
null
)
return
null
;
string
pathAndQuery
=
uri
.
PathAndQuery
;
if
(
String
.
IsNullOrEmpty
(
pathAndQuery
)
)
return
null
;
int
index
=
pathAndQuery
.
LastIndexOf
(
'/'
)
;
if
(
(
index
<
0
)
||
(
index
==
pathAndQuery
.
Length
)
)
return
null
;
return
pathAndQuery
.
Substring
(
index
+
1
)
;
}
#endregion
///////////////////////////////////////////////////////////////////////
#region Private Event Handlers
/// <summary>
/// This method is an event handler that is called when the file
/// download completion percentage changes. It will display progress
/// on the console. Special care is taken to make sure that progress
/// events are not displayed out-of-order, even if duplicate and/or
/// out-of-order events are received.
/// </summary>
/// <param name="sender">
/// The source of the event.
/// </param>
/// <param name="e">
/// Information for the event being processed.
/// </param>
private
static
void
DownloadProgressChanged
(
object
sender
,
DownloadProgressChangedEventArgs
e
)
{
if
(
e
!=
null
)
{
int
percent
=
e
.
ProgressPercentage
;
lock
(
syncRoot
)
{
if
(
percent
>
previousPercent
)
{
Console
.
Write
(
'.'
)
;
if
(
(
percent
%
10
)
==
0
)
Console
.
Write
(
" {0}% "
,
percent
)
;
previousPercent
=
percent
;
}
}
}
}
///////////////////////////////////////////////////////////////////////
/// <summary>
/// This method is an event handler that is called when the file
/// download has completed, successfully or otherwise. It will
/// display the overall result of the file download on the console,
/// including any <see cref="Exception" /> information, if applicable.
/// The <see cref="exitCode" /> field is changed by this method to
/// indicate the overall result of the file download and the event
/// within the <see cref="doneEvent" /> field will be signaled.
/// </summary>
/// <param name="sender">
/// The source of the event.
/// </param>
/// <param name="e">
/// Information for the event being processed.
/// </param>
private
static
void
DownloadFileCompleted
(
object
sender
,
AsyncCompletedEventArgs
e
)
{
if
(
e
!=
null
)
{
lock
(
syncRoot
)
{
if
(
previousPercent
<
100
)
Console
.
Write
(
' '
)
;
}
if
(
e
.
Cancelled
)
{
Console
.
WriteLine
(
"Canceled"
)
;
lock
(
syncRoot
)
{
exitCode
=
ExitCode
.
DownloadCanceled
;
}
}
else
{
Exception
error
=
e
.
Error
;
if
(
error
!=
null
)
{
Console
.
WriteLine
(
"Error: {0}"
,
error
)
;
lock
(
syncRoot
)
{
exitCode
=
ExitCode
.
DownloadError
;
}
}
else
{
Console
.
WriteLine
(
"Done"
)
;
}
}
}
if
(
doneEvent
!=
null
)
doneEvent
.
Set
(
)
;
}
#endregion
///////////////////////////////////////////////////////////////////////
#region Program Entry Point
/// <summary>
/// This is the entry-point for this tool. It handles processing the
/// command line arguments, setting up the web client, downloading the
/// file, and saving it to the file system.
/// </summary>
/// <param name="args">
/// The command line arguments.
/// </param>
/// <returns>
/// Zero upon success; non-zero on failure. This will be one of the
/// values from the <see cref="ExitCode" /> enumeration.
/// </returns>
private
static
int
Main
(
string
[
]
args
)
{
//
// NOTE: Sanity check the command line arguments.
//
if
(
args
==
null
)
{
Error
(
null
,
true
)
;
return
(
int
)
ExitCode
.
MissingArgs
;
}
if
(
args
.
Length
!=
1
)
{
Error
(
null
,
true
)
;
return
(
int
)
ExitCode
.
WrongNumArgs
;
}
//
// NOTE: Attempt to convert the first (and only) command line
// argument to an absolute URI.
//
Uri
uri
;
if
(
!
Uri
.
TryCreate
(
args
[
0
]
,
UriKind
.
Absolute
,
out
uri
)
)
{
Error
(
"Could not create absolute URI from argument."
,
false
)
;
return
(
int
)
ExitCode
.
BadUri
;
}
//
// NOTE: Attempt to extract the file name portion of the URI we
// just created.
//
string
fileName
=
GetFileName
(
uri
)
;
if
(
fileName
==
null
)
{
Error
(
"Could not extract the file name from the URI."
,
false
)
;
return
(
int
)
ExitCode
.
BadFileName
;
}
//
// NOTE: Grab the temporary path setup for this process. If it is
// unavailable, we will not continue.
//
string
directory
=
Path
.
GetTempPath
(
)
;
if
(
String
.
IsNullOrEmpty
(
directory
)
||
!
Directory
.
Exists
(
directory
)
)
{
Error
(
"Temporary directory is invalid or unavailable."
,
false
)
;
return
(
int
)
ExitCode
.
BadTempPath
;
}
try
{
using
(
WebClient
webClient
=
new
WebClient
(
)
)
{
//
// NOTE: Create the event used to signal completion of the
// file download.
//
doneEvent
=
new
ManualResetEvent
(
false
)
;
//
// NOTE: Hookup the event handlers we care about on the web
// client. These are necessary because the file is
// downloaded asynchronously.
//
webClient
.
DownloadProgressChanged
+=
new
DownloadProgressChangedEventHandler
(
DownloadProgressChanged
)
;
webClient
.
DownloadFileCompleted
+=
new
AsyncCompletedEventHandler
(
DownloadFileCompleted
)
;
//
// NOTE: Build the fully qualified path and file name,
// within the temporary directory, where the file to
// be downloaded will be saved.
//
fileName
=
Path
.
Combine
(
directory
,
fileName
)
;
//
// NOTE: If the file name already exists (in the temporary)
// directory, delete it.
//
// TODO: Perhaps an error should be raised here instead?
//
if
(
File
.
Exists
(
fileName
)
)
File
.
Delete
(
fileName
)
;
//
// NOTE: After kicking off the asynchronous file download
// process, wait [forever] until the "done" event is
// signaled.
//
Console
.
WriteLine
(
"Downloading
\"
{0}
\"
to
\"
{1}
\"
..."
,
uri
,
fileName
)
;
webClient
.
DownloadFileAsync
(
uri
,
fileName
)
;
doneEvent
.
WaitOne
(
)
;
}
lock
(
syncRoot
)
{
return
(
int
)
exitCode
;
}
}
catch
(
Exception
e
)
{
//
// NOTE: An exception was caught. Report it via the console
// and return failure.
//
Error
(
e
.
ToString
(
)
,
false
)
;
return
(
int
)
ExitCode
.
Exception
;
}
}
#endregion
}
}
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