Better rules parsing errors #708
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fntlnz
suggested changes
Jul 8, 2019
| return changed or changed_left or changed_right | ||
| local status, changed_left = expand_macros(ast.left, defs, false) | ||
| if status == false then | ||
| return false, changed_left |
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I'm not sure about the formatting of this one
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Do we have a lua formatter yet?
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| elseif ast.type == "UnaryBoolOp" then | ||
| if (ast.argument.type == "Macro") then | ||
| if (defs[ast.argument.value] == nil) then | ||
| error("Undefined macro ".. ast.argument.value .. " used in filter.") | ||
| return false, "Undefined macro ".. ast.argument.value .. " used in filter." |
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| row, col = string.match(rules, pat) | ||
| if row ~= nil and col ~= nil then | ||
| rules = string.gsub(rules, pat, "") |
leodido
previously approved these changes
Jul 10, 2019
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LGTM label has been added. Git tree hash: 4a23a0b60ca6b4d984c853c2dac11062ab4eef3b
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New test options stdout_is/stderr_is do a direct comparison between stdout/stderr and the provided value. Test option validate_rules_file maps to -V arguments, which validate rules and exits. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>
When parsing rules files with -V (validate), print info on the result of loading the rules file to stdout. That way a caller can capture stdout to pass along any rules parsing error. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>
Instead of relying on lua errors to pass back parse errors, pass back an explicit true + required engine version or false + error message. Also clean up the error message to display info + context on the error. When the error related to yaml parsing, use the row number passed back in lyaml's error string to print the specific line with the error. When parsing rules/macros/lists, print the object being parsed alongside the error. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>
Add a bunch of additional test cases for validating rules files. Each has a specific kind of parse failure and checks for the appropriate error info on stdout. Signed-off-by: Mark Stemm <mark.stemm@gmail.com>
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leodido
approved these changes
Jul 11, 2019
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LGTM label has been added. Git tree hash: 4f46d0e4761b438e14c8d56a94be06745def0618
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@fntlnz , since we agreed that any lua formatting changes will occur in a separate PR, can you approve this one? I can't merge w/ requested changes. |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: fntlnz, leodido The full list of commands accepted by this bot can be found here. The pull request process is described here
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Thank you! |
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What type of PR is this?
/kind cleanup
Any specific area of the project related to this PR?
/area engine
/area rules
What this PR does / why we need it:
This cleans up rule validation to pass back consistent and appropriate error messages along with meaningful context. It can be used by callers that want to validate falco rules files.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing change?: