kingluo commented on issue #7674:
URL: https://github.com/apache/apisix/issues/7674#issuecomment-1216450883
@akalittle The `hex2bytes` assumes the input string is in valid hex format
(`[0-9a-f]{32}`), and transforms each hex u8 number into char. The `char()`
assumes the number ranges from 0~255, otherwise it would throw error.
It's likely your `span.ctx.trace_id`
(https://github.com/yangxikun/opentelemetry-lua/blob/v0.1.3/lib/opentelemetry/trace/exporter/otlp.lua#L50)
contains `-`, which means negative number and cause `char()` failed. It means
your trace id comes from `x-request-id` in invalid format.
```lua
local function hex2bytes(str)
return (str:gsub('..', function (cc)
local n = tonumber(cc, 16)
if n then
print(n)
return string.char(n)
end
end))
end
hex2bytes("xx-1")
```
```
/usr/local/openresty-debug/luajit/bin/luajit: bad argument #1 to '?'
(invalid value)
stack traceback:
[builtin#80]: at 0x5571dae60530
[C]: in function 'gsub'
/tmp/test_gsub.lua:2: in function 'hex2bytes'
/tmp/test_gsub.lua:11: in main chunk
[C]: at 0x5571dadfc320
```
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