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REPL crash on tab completion. #2119

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hemanth opened this issue Jul 7, 2015 · 2 comments
Closed

REPL crash on tab completion. #2119

hemanth opened this issue Jul 7, 2015 · 2 comments
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repl Issues and PRs related to the REPL subsystem.

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@hemanth
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hemanth commented Jul 7, 2015 

$ iojs  --version
v2.3.3

$ iojs  --harmony-proxies
var proxy = Proxy.create({ fix: function() { return {}; } });

proxy.<tab>

TypeError: Proxy handler #<Object> has no 'getOwnPropertyNames' trap
    at Function.getOwnPropertyNames (native)
    at repl.js:644:40
    at REPLServer.defaultEval (repl.js:169:5)
    at bound (domain.js:254:14)
    at REPLServer.runBound [as eval] (domain.js:267:12)
    at REPLServer.complete (repl.js:639:14)
    at REPLServer.complete [as completer] (repl.js:207:10)
    at REPLServer.Interface._tabComplete (readline.js:377:8)
    at REPLServer.Interface._ttyWrite (readline.js:845:14)
    at ReadStream.onkeypress (readline.js:105:10)
@thefourtheye thefourtheye mentioned this issue Jul 7, 2015
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@mscdex mscdex added the repl Issues and PRs related to the REPL subsystem. label Jul 7, 2015
thefourtheye added a commit to thefourtheye/io.js that referenced this issue Jul 7, 2015
@thefourtheye
repl: Prevent REPL crash when tab-completed with Proxy objects
fc1ae90 
If the proxy objects don't have a valid `hasOwnPropertyNames` trap,
REPL crashes with a `TypeError`, as per the bug report
nodejs#2119

    > var proxy = Proxy.create({ fix: function() { return {}; } });
    undefined
    > proxy.<tab>
    TypeError: Proxy handler #<Object> has no 'getOwnPropertyNames' trap
        at Function.getOwnPropertyNames (native)
        at repl.js:644:40
        at REPLServer.defaultEval (repl.js:169:5)
        at bound (domain.js:254:14)
        at REPLServer.runBound [as eval] (domain.js:267:12)
        at REPLServer.complete (repl.js:639:14)
        at REPLServer.complete [as completer] (repl.js:207:10)
        at REPLServer.Interface._tabComplete (readline.js:377:8)
        at REPLServer.Interface._ttyWrite (readline.js:845:14)
        at ReadStream.onkeypress (readline.js:105:10)

This patch traps the error thrown and suppresses it.
evanlucas pushed a commit that referenced this issue Jul 10, 2015
@thefourtheye @evanlucas
repl: Prevent crash when tab-completed with Proxy
59f6b5d 
If the proxy objects don't have a valid `hasOwnPropertyNames` trap,
REPL crashes with a `TypeError`, as per the bug report
#2119

    > var proxy = Proxy.create({ fix: function() { return {}; } });
    undefined
    > proxy.<tab>
    TypeError: Proxy handler #<Object> has no 'getOwnPropertyNames' trap
        at Function.getOwnPropertyNames (native)
        at repl.js:644:40
        at REPLServer.defaultEval (repl.js:169:5)
        at bound (domain.js:254:14)
        at REPLServer.runBound [as eval] (domain.js:267:12)
        at REPLServer.complete (repl.js:639:14)
        at REPLServer.complete [as completer] (repl.js:207:10)
        at REPLServer.Interface._tabComplete (readline.js:377:8)
        at REPLServer.Interface._ttyWrite (readline.js:845:14)
        at ReadStream.onkeypress (readline.js:105:10)

This patch traps the error thrown and suppresses it.

PR-URL: #2120
Fixes: #2119
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
@evanlucas
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Fixed by 59f6b5d.

@hemanth
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hemanth commented Jul 13, 2015

try-catch hmm I shall read repl.js next time ;) 👍

@github-actions github-actions bot mentioned this issue Apr 24, 2024
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@hemanth @mscdex @evanlucas