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Merge pull request #759 from zielmicha/stdmsg

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Write tracebacks to stderr instead of stdout.
This commit is contained in:
Andreas Rumpf
2013-12-20 09:42:39 -08:00
parent 22e88026af 7d5fa3f52d
commit 259d205ff6
8 changed files with 84 additions and 41 deletions
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2
.gitignore vendored
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@@ -63,6 +63,8 @@ examples/cross_calculator/android/tags
/examples/allany
/examples/cairoex
/examples/cgiex
/examples/cgi/cgi_stacktrace
/examples/cgi/example
/examples/curlex
/examples/debugging
/examples/docstrings

11
examples/cgi/cgi_server.py Normal file
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@@ -0,0 +1,11 @@
#!/usr/bin/env python
import BaseHTTPServer
import CGIHTTPServer
server = BaseHTTPServer.HTTPServer
handler = CGIHTTPServer.CGIHTTPRequestHandler
server_address = ('localhost', 8008)
handler.cgi_directories = ['/']
httpd = server(server_address, handler)
httpd.serve_forever()

5
examples/cgi/cgi_stacktrace.nim Normal file
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@@ -0,0 +1,5 @@
import cgi
cgi.setStackTraceStdout()
var a: string = nil
a.add "foobar"

7
examples/cgi/example.nim Normal file
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@@ -0,0 +1,7 @@
import cgi
write(stdout, "Content-type: text/html\n\n")
write(stdout, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\">\n")
write(stdout, "<html><head><title>Test</title></head><body>\n")
write(stdout, "Hello!")
writeln(stdout, "</body></html>")

36
lib/pure/cgi.nim
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@@ -342,16 +342,35 @@ proc writeContentType*() =
##
## .. code-block:: Nimrod
## write(stdout, "Content-type: text/html\n\n")
##
## It also modifies the debug stack traces so that they contain
## ``<br />`` and are easily readable in a browser.
write(stdout, "Content-type: text/html\n\n")
system.stackTraceNewLine = "<br />\n"
proc setStackTraceNewLine*() =
## Modifies the debug stack traces so that they contain
## ``<br />`` and are easily readable in a browser.
system.stackTraceNewLine = "<br />\n"
proc resetForStacktrace() =
stdout.write """<!--: spam
Content-Type: text/html
<body bgcolor=#f0f0f8><font color=#f0f0f8 size=-5> -->
<body bgcolor=#f0f0f8><font color=#f0f0f8 size=-5> --> -->
</font> </font> </font> </script> </object> </blockquote> </pre>
</table> </table> </table> </table> </table> </font> </font> </font>
"""
proc writeErrorMessage*(data: string) =
## Tries to reset browser state and writes `data` to stdout in
## <plaintext> tag.
resetForStacktrace()
# We use <plaintext> here, instead of escaping, so stacktrace can
# be understood by human looking at source.
stdout.write("<plaintext>\n")
stdout.write(data)
proc setStackTraceStdout*() =
## Makes Nimrod output stacktraces to stdout, instead of server log.
errorMessageWriter = writeErrorMessage
proc setStackTraceNewLine*() {.deprecated.} =
## Makes Nimrod output stacktraces to stdout, instead of server log.
## Depracated alias for setStackTraceStdout.
setStackTraceStdout()
proc setCookie*(name, value: string) =
## Sets a cookie.
@@ -374,4 +393,3 @@ when isMainModule:
const test1 = "abc\L+def xyz"
assert UrlEncode(test1) == "abc%0A%2Bdef+xyz"
assert UrlDecode(UrlEncode(test1)) == test1

16
lib/system.nim
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@@ -1951,15 +1951,13 @@ when not defined(JS): #and not defined(NimrodVM):
## The standard output stream.
stderr* {.importc: "stderr", header: "<stdio.h>".}: TFile
## The standard error stream.
##
## Note: In my opinion, this should not be used -- the concept of a
## separate error stream is a design flaw of UNIX. A separate *message
## stream* is a good idea, but since it is named ``stderr`` there are few
## programs out there that distinguish properly between ``stdout`` and
## ``stderr``. So, that's what you get if you don't name your variables
## appropriately. It also annoys people if redirection
## via ``>output.txt`` does not work because the program writes
## to ``stderr``.
when defined(useStdoutAsStdmsg):
template stdmsg*: TFile = stdout
else:
template stdmsg*: TFile = stderr
## Template which expands to either stdout or stderr depending on
## `useStdoutAsStdmsg` compile-time switch.
proc Open*(f: var TFile, filename: string,
mode: TFileMode = fmRead, bufSize: int = -1): Bool {.tags: [].}

44
lib/system/excpt.nim
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@@ -11,14 +11,13 @@
# use the heap (and nor exceptions) do not include the GC or memory allocator.
var
stackTraceNewLine*: string ## undocumented feature; it is replaced by ``<br>``
## for CGI applications
template stackTraceNL: expr =
(if IsNil(stackTraceNewLine): "\n" else: stackTraceNewLine)
errorMessageWriter*: (proc(msg: string): void {.tags: [FWriteIO].})
## Function that will be called
## instead of stdmsg.write when printing stacktrace.
## Unstable API.
when not defined(windows) or not defined(guiapp):
proc writeToStdErr(msg: CString) = write(stdout, msg)
proc writeToStdErr(msg: CString) = write(stdmsg, msg)
else:
proc MessageBoxA(hWnd: cint, lpText, lpCaption: cstring, uType: int): int32 {.
@@ -27,6 +26,12 @@ else:
proc writeToStdErr(msg: CString) =
discard MessageBoxA(0, msg, nil, 0)
proc showErrorMessage(data: cstring) =
if errorMessageWriter != nil:
errorMessageWriter($data)
else:
writeToStdErr(data)
proc chckIndx(i, a, b: int): int {.inline, compilerproc.}
proc chckRange(i, a, b: int): int {.inline, compilerproc.}
proc chckRangeF(x, a, b: float): float {.inline, compilerproc.}
@@ -111,7 +116,7 @@ when defined(nativeStacktrace) and nativeStackTraceSupported:
add(s, tempDlInfo.dli_sname)
else:
add(s, '?')
add(s, stackTraceNL)
add(s, "\n")
else:
if dlresult != 0 and tempDlInfo.dli_sname != nil and
c_strcmp(tempDlInfo.dli_sname, "signalHandler") == 0'i32:
@@ -172,21 +177,18 @@ proc auxWriteStackTrace(f: PFrame, s: var string) =
add(s, ')')
for k in 1..max(1, 25-(s.len-oldLen)): add(s, ' ')
add(s, tempFrames[j].procname)
add(s, stackTraceNL)
add(s, "\n")
when hasSomeStackTrace:
proc rawWriteStackTrace(s: var string) =
when nimrodStackTrace:
if framePtr == nil:
add(s, "No stack traceback available")
add(s, stackTraceNL)
add(s, "No stack traceback available\n")
else:
add(s, "Traceback (most recent call last)")
add(s, stackTraceNL)
add(s, "Traceback (most recent call last)\n")
auxWriteStackTrace(framePtr, s)
elif defined(nativeStackTrace) and nativeStackTraceSupported:
add(s, "Traceback from system (most recent call last)")
add(s, stackTraceNL)
add(s, "Traceback from system (most recent call last)\n")
auxWriteStackTraceWithBacktrace(s)
else:
add(s, "No stack traceback available\n")
@@ -207,7 +209,7 @@ proc raiseExceptionAux(e: ref E_Base) =
pushCurrentException(e)
c_longjmp(excHandler.context, 1)
elif e[] of EOutOfMemory:
writeToStdErr(e.name)
showErrorMessage(e.name)
quitOrDebug()
else:
when hasSomeStackTrace:
@@ -219,7 +221,7 @@ proc raiseExceptionAux(e: ref E_Base) =
add(buf, " [")
add(buf, $e.name)
add(buf, "]\n")
writeToStdErr(buf)
showErrorMessage(buf)
else:
# ugly, but avoids heap allocations :-)
template xadd(buf, s, slen: expr) =
@@ -235,7 +237,7 @@ proc raiseExceptionAux(e: ref E_Base) =
add(buf, " [")
xadd(buf, e.name, c_strlen(e.name))
add(buf, "]\n")
writeToStdErr(buf)
showErrorMessage(buf)
quitOrDebug()
proc raiseException(e: ref E_Base, ename: CString) {.compilerRtl.} =
@@ -255,9 +257,9 @@ proc WriteStackTrace() =
when hasSomeStackTrace:
var s = ""
rawWriteStackTrace(s)
writeToStdErr(s)
showErrorMessage(s)
else:
writeToStdErr("No stack traceback available\n")
showErrorMessage("No stack traceback available\n")
proc getStackTrace(): string =
when hasSomeStackTrace:
@@ -298,13 +300,13 @@ when not defined(noSignalHandler):
var buf = newStringOfCap(2000)
rawWriteStackTrace(buf)
processSignal(sig, buf.add) # nice hu? currying a la nimrod :-)
writeToStdErr(buf)
showErrorMessage(buf)
GC_enable()
else:
var msg: cstring
template asgn(y: expr) = msg = y
processSignal(sig, asgn)
writeToStdErr(msg)
showErrorMessage(msg)
when defined(endb): dbgAborting = True
quit(1) # always quit when SIGABRT

4
web/news.txt
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@@ -29,7 +29,6 @@ Changes affecting backwards compatibility
using the new ``OSLastError`` proc.
- ``os.parentDir`` now returns "" if there is no parent dir.
Compiler Additions
------------------
@@ -41,7 +40,8 @@ Compiler Additions
over the generated code.
- The compiler now supports a ``computedGoto`` pragma to support very fast
dispatching for interpreters and the like.
- In CGI scripts stacktraces are shown user only if cgi.setStackTraceStdout
is used.
Language Additions
------------------