view mercurial/hgweb/webutil.py @ 37007:143219fc2620

debugcommands: introduce actions to perform deterministic reads

"readavailable" is useful as a debugging device to see what data is
available on a pipe. But the mechanism isn't deterministic because
what's available on a pipe is highly conditional on timing, system
load, OS behavior, etc. This makes it not suitable for tests.

We introduce "ereadline," "read," and "eread" for performing
deterministic I/O operations (at least on blocking file descriptors).

We stop short of converting existing consumers of "readavailable"
in tests because we're working out race conditions and deadlocks
on Windows. But the goal is to eventually move tests away from
"readavailable" to these new APIs.

Differential Revision: https://phab.mercurial-scm.org/D2720

# hgweb/webutil.py - utility library for the web interface.
#
# Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import copy
import difflib
import os
import re

from ..i18n import _
from ..node import hex, nullid, short

from .common import (
    ErrorResponse,
    HTTP_BAD_REQUEST,
    HTTP_NOT_FOUND,
    paritygen,
)

from .. import (
    context,
    error,
    match,
    mdiff,
    obsutil,
    patch,
    pathutil,
    pycompat,
    templatefilters,
    templatekw,
    ui as uimod,
    util,
)

def up(p):
    if p[0:1] != "/":
        p = "/" + p
    if p[-1:] == "/":
        p = p[:-1]
    up = os.path.dirname(p)
    if up == "/":
        return "/"
    return up + "/"

def _navseq(step, firststep=None):
    if firststep:
        yield firststep
        if firststep >= 20 and firststep <= 40:
            firststep = 50
            yield firststep
        assert step > 0
        assert firststep > 0
        while step <= firststep:
            step *= 10
    while True:
        yield 1 * step
        yield 3 * step
        step *= 10

class revnav(object):

    def __init__(self, repo):
        """Navigation generation object

        :repo: repo object we generate nav for
        """
        # used for hex generation
        self._revlog = repo.changelog

    def __nonzero__(self):
        """return True if any revision to navigate over"""
        return self._first() is not None

    __bool__ = __nonzero__

    def _first(self):
        """return the minimum non-filtered changeset or None"""
        try:
            return next(iter(self._revlog))
        except StopIteration:
            return None

    def hex(self, rev):
        return hex(self._revlog.node(rev))

    def gen(self, pos, pagelen, limit):
        """computes label and revision id for navigation link

        :pos: is the revision relative to which we generate navigation.
        :pagelen: the size of each navigation page
        :limit: how far shall we link

        The return is:
            - a single element tuple
            - containing a dictionary with a `before` and `after` key
            - values are generator functions taking arbitrary number of kwargs
            - yield items are dictionaries with `label` and `node` keys
        """
        if not self:
            # empty repo
            return ({'before': (), 'after': ()},)

        targets = []
        for f in _navseq(1, pagelen):
            if f > limit:
                break
            targets.append(pos + f)
            targets.append(pos - f)
        targets.sort()

        first = self._first()
        navbefore = [("(%i)" % first, self.hex(first))]
        navafter = []
        for rev in targets:
            if rev not in self._revlog:
                continue
            if pos < rev < limit:
                navafter.append(("+%d" % abs(rev - pos), self.hex(rev)))
            if 0 < rev < pos:
                navbefore.append(("-%d" % abs(rev - pos), self.hex(rev)))


        navafter.append(("tip", "tip"))

        data = lambda i: {"label": i[0], "node": i[1]}
        return ({'before': lambda **map: (data(i) for i in navbefore),
                 'after':  lambda **map: (data(i) for i in navafter)},)

class filerevnav(revnav):

    def __init__(self, repo, path):
        """Navigation generation object

        :repo: repo object we generate nav for
        :path: path of the file we generate nav for
        """
        # used for iteration
        self._changelog = repo.unfiltered().changelog
        # used for hex generation
        self._revlog = repo.file(path)

    def hex(self, rev):
        return hex(self._changelog.node(self._revlog.linkrev(rev)))

class _siblings(object):
    def __init__(self, siblings=None, hiderev=None):
        if siblings is None:
            siblings = []
        self.siblings = [s for s in siblings if s.node() != nullid]
        if len(self.siblings) == 1 and self.siblings[0].rev() == hiderev:
            self.siblings = []

    def __iter__(self):
        for s in self.siblings:
            d = {
                'node': s.hex(),
                'rev': s.rev(),
                'user': s.user(),
                'date': s.date(),
                'description': s.description(),
                'branch': s.branch(),
            }
            if util.safehasattr(s, 'path'):
                d['file'] = s.path()
            yield d

    def __len__(self):
        return len(self.siblings)

def difffeatureopts(req, ui, section):
    diffopts = patch.difffeatureopts(ui, untrusted=True,
                                     section=section, whitespace=True)

    for k in ('ignorews', 'ignorewsamount', 'ignorewseol', 'ignoreblanklines'):
        v = req.qsparams.get(k)
        if v is not None:
            v = util.parsebool(v)
            setattr(diffopts, k, v if v is not None else True)

    return diffopts

def annotate(req, fctx, ui):
    diffopts = difffeatureopts(req, ui, 'annotate')
    return fctx.annotate(follow=True, linenumber=True, diffopts=diffopts)

def parents(ctx, hide=None):
    if isinstance(ctx, context.basefilectx):
        introrev = ctx.introrev()
        if ctx.changectx().rev() != introrev:
            return _siblings([ctx.repo()[introrev]], hide)
    return _siblings(ctx.parents(), hide)

def children(ctx, hide=None):
    return _siblings(ctx.children(), hide)

def renamelink(fctx):
    r = fctx.renamed()
    if r:
        return [{'file': r[0], 'node': hex(r[1])}]
    return []

def nodetagsdict(repo, node):
    return [{"name": i} for i in repo.nodetags(node)]

def nodebookmarksdict(repo, node):
    return [{"name": i} for i in repo.nodebookmarks(node)]

def nodebranchdict(repo, ctx):
    branches = []
    branch = ctx.branch()
    # If this is an empty repo, ctx.node() == nullid,
    # ctx.branch() == 'default'.
    try:
        branchnode = repo.branchtip(branch)
    except error.RepoLookupError:
        branchnode = None
    if branchnode == ctx.node():
        branches.append({"name": branch})
    return branches

def nodeinbranch(repo, ctx):
    branches = []
    branch = ctx.branch()
    try:
        branchnode = repo.branchtip(branch)
    except error.RepoLookupError:
        branchnode = None
    if branch != 'default' and branchnode != ctx.node():
        branches.append({"name": branch})
    return branches

def nodebranchnodefault(ctx):
    branches = []
    branch = ctx.branch()
    if branch != 'default':
        branches.append({"name": branch})
    return branches

def showtag(repo, tmpl, t1, node=nullid, **args):
    for t in repo.nodetags(node):
        yield tmpl(t1, tag=t, **args)

def showbookmark(repo, tmpl, t1, node=nullid, **args):
    for t in repo.nodebookmarks(node):
        yield tmpl(t1, bookmark=t, **args)

def branchentries(repo, stripecount, limit=0):
    tips = []
    heads = repo.heads()
    parity = paritygen(stripecount)
    sortkey = lambda item: (not item[1], item[0].rev())

    def entries(**map):
        count = 0
        if not tips:
            for tag, hs, tip, closed in repo.branchmap().iterbranches():
                tips.append((repo[tip], closed))
        for ctx, closed in sorted(tips, key=sortkey, reverse=True):
            if limit > 0 and count >= limit:
                return
            count += 1
            if closed:
                status = 'closed'
            elif ctx.node() not in heads:
                status = 'inactive'
            else:
                status = 'open'
            yield {
                'parity': next(parity),
                'branch': ctx.branch(),
                'status': status,
                'node': ctx.hex(),
                'date': ctx.date()
            }

    return entries

def cleanpath(repo, path):
    path = path.lstrip('/')
    return pathutil.canonpath(repo.root, '', path)

def changeidctx(repo, changeid):
    try:
        ctx = repo[changeid]
    except error.RepoError:
        man = repo.manifestlog._revlog
        ctx = repo[man.linkrev(man.rev(man.lookup(changeid)))]

    return ctx

def changectx(repo, req):
    changeid = "tip"
    if 'node' in req.qsparams:
        changeid = req.qsparams['node']
        ipos = changeid.find(':')
        if ipos != -1:
            changeid = changeid[(ipos + 1):]
    elif 'manifest' in req.qsparams:
        changeid = req.qsparams['manifest']

    return changeidctx(repo, changeid)

def basechangectx(repo, req):
    if 'node' in req.qsparams:
        changeid = req.qsparams['node']
        ipos = changeid.find(':')
        if ipos != -1:
            changeid = changeid[:ipos]
            return changeidctx(repo, changeid)

    return None

def filectx(repo, req):
    if 'file' not in req.qsparams:
        raise ErrorResponse(HTTP_NOT_FOUND, 'file not given')
    path = cleanpath(repo, req.qsparams['file'])
    if 'node' in req.qsparams:
        changeid = req.qsparams['node']
    elif 'filenode' in req.qsparams:
        changeid = req.qsparams['filenode']
    else:
        raise ErrorResponse(HTTP_NOT_FOUND, 'node or filenode not given')
    try:
        fctx = repo[changeid][path]
    except error.RepoError:
        fctx = repo.filectx(path, fileid=changeid)

    return fctx

def linerange(req):
    linerange = req.qsparams.getall('linerange')
    if not linerange:
        return None
    if len(linerange) > 1:
        raise ErrorResponse(HTTP_BAD_REQUEST,
                            'redundant linerange parameter')
    try:
        fromline, toline = map(int, linerange[0].split(':', 1))
    except ValueError:
        raise ErrorResponse(HTTP_BAD_REQUEST,
                            'invalid linerange parameter')
    try:
        return util.processlinerange(fromline, toline)
    except error.ParseError as exc:
        raise ErrorResponse(HTTP_BAD_REQUEST, pycompat.bytestr(exc))

def formatlinerange(fromline, toline):
    return '%d:%d' % (fromline + 1, toline)

def succsandmarkers(context, mapping):
    repo = context.resource(mapping, 'repo')
    for item in templatekw.showsuccsandmarkers(context, mapping):
        item['successors'] = _siblings(repo[successor]
                                       for successor in item['successors'])
        yield item

# teach templater succsandmarkers is switched to (context, mapping) API
succsandmarkers._requires = {'repo', 'ctx', 'templ'}

def whyunstable(context, mapping):
    repo = context.resource(mapping, 'repo')
    ctx = context.resource(mapping, 'ctx')

    entries = obsutil.whyunstable(repo, ctx)
    for entry in entries:
        if entry.get('divergentnodes'):
            entry['divergentnodes'] = _siblings(entry['divergentnodes'])
        yield entry

whyunstable._requires = {'repo', 'ctx', 'templ'}

def commonentry(repo, ctx):
    node = ctx.node()
    return {
        # TODO: perhaps ctx.changectx() should be assigned if ctx is a
        # filectx, but I'm not pretty sure if that would always work because
        # fctx.parents() != fctx.changectx.parents() for example.
        'ctx': ctx,
        'revcache': {},
        'rev': ctx.rev(),
        'node': hex(node),
        'author': ctx.user(),
        'desc': ctx.description(),
        'date': ctx.date(),
        'extra': ctx.extra(),
        'phase': ctx.phasestr(),
        'obsolete': ctx.obsolete(),
        'succsandmarkers': succsandmarkers,
        'instabilities': [{"instability": i} for i in ctx.instabilities()],
        'whyunstable': whyunstable,
        'branch': nodebranchnodefault(ctx),
        'inbranch': nodeinbranch(repo, ctx),
        'branches': nodebranchdict(repo, ctx),
        'tags': nodetagsdict(repo, node),
        'bookmarks': nodebookmarksdict(repo, node),
        'parent': lambda **x: parents(ctx),
        'child': lambda **x: children(ctx),
    }

def changelistentry(web, ctx):
    '''Obtain a dictionary to be used for entries in a changelist.

    This function is called when producing items for the "entries" list passed
    to the "shortlog" and "changelog" templates.
    '''
    repo = web.repo
    rev = ctx.rev()
    n = ctx.node()
    showtags = showtag(repo, web.tmpl, 'changelogtag', n)
    files = listfilediffs(web.tmpl, ctx.files(), n, web.maxfiles)

    entry = commonentry(repo, ctx)
    entry.update(
        allparents=lambda **x: parents(ctx),
        parent=lambda **x: parents(ctx, rev - 1),
        child=lambda **x: children(ctx, rev + 1),
        changelogtag=showtags,
        files=files,
    )
    return entry

def symrevorshortnode(req, ctx):
    if 'node' in req.qsparams:
        return templatefilters.revescape(req.qsparams['node'])
    else:
        return short(ctx.node())

def changesetentry(web, ctx):
    '''Obtain a dictionary to be used to render the "changeset" template.'''

    showtags = showtag(web.repo, web.tmpl, 'changesettag', ctx.node())
    showbookmarks = showbookmark(web.repo, web.tmpl, 'changesetbookmark',
                                 ctx.node())
    showbranch = nodebranchnodefault(ctx)

    files = []
    parity = paritygen(web.stripecount)
    for blockno, f in enumerate(ctx.files()):
        template = 'filenodelink' if f in ctx else 'filenolink'
        files.append(web.tmpl(template,
                              node=ctx.hex(), file=f, blockno=blockno + 1,
                              parity=next(parity)))

    basectx = basechangectx(web.repo, web.req)
    if basectx is None:
        basectx = ctx.p1()

    style = web.config('web', 'style')
    if 'style' in web.req.qsparams:
        style = web.req.qsparams['style']

    diff = diffs(web, ctx, basectx, None, style)

    parity = paritygen(web.stripecount)
    diffstatsgen = diffstatgen(ctx, basectx)
    diffstats = diffstat(web.tmpl, ctx, diffstatsgen, parity)

    return dict(
        diff=diff,
        symrev=symrevorshortnode(web.req, ctx),
        basenode=basectx.hex(),
        changesettag=showtags,
        changesetbookmark=showbookmarks,
        changesetbranch=showbranch,
        files=files,
        diffsummary=lambda **x: diffsummary(diffstatsgen),
        diffstat=diffstats,
        archives=web.archivelist(ctx.hex()),
        **pycompat.strkwargs(commonentry(web.repo, ctx)))

def listfilediffs(tmpl, files, node, max):
    for f in files[:max]:
        yield tmpl('filedifflink', node=hex(node), file=f)
    if len(files) > max:
        yield tmpl('fileellipses')

def diffs(web, ctx, basectx, files, style, linerange=None,
          lineidprefix=''):

    def prettyprintlines(lines, blockno):
        for lineno, l in enumerate(lines, 1):
            difflineno = "%d.%d" % (blockno, lineno)
            if l.startswith('+'):
                ltype = "difflineplus"
            elif l.startswith('-'):
                ltype = "difflineminus"
            elif l.startswith('@'):
                ltype = "difflineat"
            else:
                ltype = "diffline"
            yield web.tmpl(
                ltype,
                line=l,
                lineno=lineno,
                lineid=lineidprefix + "l%s" % difflineno,
                linenumber="% 8s" % difflineno)

    repo = web.repo
    if files:
        m = match.exact(repo.root, repo.getcwd(), files)
    else:
        m = match.always(repo.root, repo.getcwd())

    diffopts = patch.diffopts(repo.ui, untrusted=True)
    node1 = basectx.node()
    node2 = ctx.node()
    parity = paritygen(web.stripecount)

    diffhunks = patch.diffhunks(repo, node1, node2, m, opts=diffopts)
    for blockno, (fctx1, fctx2, header, hunks) in enumerate(diffhunks, 1):
        if style != 'raw':
            header = header[1:]
        lines = [h + '\n' for h in header]
        for hunkrange, hunklines in hunks:
            if linerange is not None and hunkrange is not None:
                s1, l1, s2, l2 = hunkrange
                if not mdiff.hunkinrange((s2, l2), linerange):
                    continue
            lines.extend(hunklines)
        if lines:
            yield web.tmpl('diffblock', parity=next(parity), blockno=blockno,
                           lines=prettyprintlines(lines, blockno))

def compare(tmpl, context, leftlines, rightlines):
    '''Generator function that provides side-by-side comparison data.'''

    def compline(type, leftlineno, leftline, rightlineno, rightline):
        lineid = leftlineno and ("l%d" % leftlineno) or ''
        lineid += rightlineno and ("r%d" % rightlineno) or ''
        llno = '%d' % leftlineno if leftlineno else ''
        rlno = '%d' % rightlineno if rightlineno else ''
        return tmpl('comparisonline',
                    type=type,
                    lineid=lineid,
                    leftlineno=leftlineno,
                    leftlinenumber="% 6s" % llno,
                    leftline=leftline or '',
                    rightlineno=rightlineno,
                    rightlinenumber="% 6s" % rlno,
                    rightline=rightline or '')

    def getblock(opcodes):
        for type, llo, lhi, rlo, rhi in opcodes:
            len1 = lhi - llo
            len2 = rhi - rlo
            count = min(len1, len2)
            for i in xrange(count):
                yield compline(type=type,
                               leftlineno=llo + i + 1,
                               leftline=leftlines[llo + i],
                               rightlineno=rlo + i + 1,
                               rightline=rightlines[rlo + i])
            if len1 > len2:
                for i in xrange(llo + count, lhi):
                    yield compline(type=type,
                                   leftlineno=i + 1,
                                   leftline=leftlines[i],
                                   rightlineno=None,
                                   rightline=None)
            elif len2 > len1:
                for i in xrange(rlo + count, rhi):
                    yield compline(type=type,
                                   leftlineno=None,
                                   leftline=None,
                                   rightlineno=i + 1,
                                   rightline=rightlines[i])

    s = difflib.SequenceMatcher(None, leftlines, rightlines)
    if context < 0:
        yield tmpl('comparisonblock', lines=getblock(s.get_opcodes()))
    else:
        for oc in s.get_grouped_opcodes(n=context):
            yield tmpl('comparisonblock', lines=getblock(oc))

def diffstatgen(ctx, basectx):
    '''Generator function that provides the diffstat data.'''

    stats = patch.diffstatdata(
        util.iterlines(ctx.diff(basectx, noprefix=False)))
    maxname, maxtotal, addtotal, removetotal, binary = patch.diffstatsum(stats)
    while True:
        yield stats, maxname, maxtotal, addtotal, removetotal, binary

def diffsummary(statgen):
    '''Return a short summary of the diff.'''

    stats, maxname, maxtotal, addtotal, removetotal, binary = next(statgen)
    return _(' %d files changed, %d insertions(+), %d deletions(-)\n') % (
             len(stats), addtotal, removetotal)

def diffstat(tmpl, ctx, statgen, parity):
    '''Return a diffstat template for each file in the diff.'''

    stats, maxname, maxtotal, addtotal, removetotal, binary = next(statgen)
    files = ctx.files()

    def pct(i):
        if maxtotal == 0:
            return 0
        return (float(i) / maxtotal) * 100

    fileno = 0
    for filename, adds, removes, isbinary in stats:
        template = 'diffstatlink' if filename in files else 'diffstatnolink'
        total = adds + removes
        fileno += 1
        yield tmpl(template, node=ctx.hex(), file=filename, fileno=fileno,
                   total=total, addpct=pct(adds), removepct=pct(removes),
                   parity=next(parity))

class sessionvars(object):
    def __init__(self, vars, start='?'):
        self.start = start
        self.vars = vars
    def __getitem__(self, key):
        return self.vars[key]
    def __setitem__(self, key, value):
        self.vars[key] = value
    def __copy__(self):
        return sessionvars(copy.copy(self.vars), self.start)
    def __iter__(self):
        separator = self.start
        for key, value in sorted(self.vars.iteritems()):
            yield {'name': key,
                   'value': pycompat.bytestr(value),
                   'separator': separator,
            }
            separator = '&'

class wsgiui(uimod.ui):
    # default termwidth breaks under mod_wsgi
    def termwidth(self):
        return 80

def getwebsubs(repo):
    websubtable = []
    websubdefs = repo.ui.configitems('websub')
    # we must maintain interhg backwards compatibility
    websubdefs += repo.ui.configitems('interhg')
    for key, pattern in websubdefs:
        # grab the delimiter from the character after the "s"
        unesc = pattern[1:2]
        delim = re.escape(unesc)

        # identify portions of the pattern, taking care to avoid escaped
        # delimiters. the replace format and flags are optional, but
        # delimiters are required.
        match = re.match(
            br'^s%s(.+)(?:(?<=\\\\)|(?<!\\))%s(.*)%s([ilmsux])*$'
            % (delim, delim, delim), pattern)
        if not match:
            repo.ui.warn(_("websub: invalid pattern for %s: %s\n")
                              % (key, pattern))
            continue

        # we need to unescape the delimiter for regexp and format
        delim_re = re.compile(br'(?<!\\)\\%s' % delim)
        regexp = delim_re.sub(unesc, match.group(1))
        format = delim_re.sub(unesc, match.group(2))

        # the pattern allows for 6 regexp flags, so set them if necessary
        flagin = match.group(3)
        flags = 0
        if flagin:
            for flag in flagin.upper():
                flags |= re.__dict__[flag]

        try:
            regexp = re.compile(regexp, flags)
            websubtable.append((regexp, format))
        except re.error:
            repo.ui.warn(_("websub: invalid regexp for %s: %s\n")
                         % (key, regexp))
    return websubtable