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increase buffer size for stream to lines to accomodate oversize packets #3112

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Merged
sawka merged 1 commit into from
Mar 24, 2026
Merged

increase buffer size for stream to lines to accomodate oversize packets #3112

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4 changes: 3 additions & 1 deletion pkg/util/utilfn/streamtolines.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,9 @@ type lineBuf struct {
inLongLine bool
}

const maxLineLength = 128 * 1024
// needs to be large enough to read the largest RPC packet
// there are some legacy file transfer packets that can send up to 32m (base64 encoded)
const maxLineLength = 64 * 1024 * 1024
Comment on lines +23 to +25
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@coderabbitai coderabbitai bot Mar 24, 2026

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⚠️ Potential issue | 🟠 Major

Scope the 64MB cap to RPC-specific usage instead of changing the global default.

This constant is shared by both StreamToLines and LineWriter, so Line 25 now allows ~64MB buffering per in-flight line for all callers. That can materially increase memory pressure under concurrent streams. Prefer a configurable limit (or an RPC-specific constructor/path with 64MB) while keeping a safer general default.

🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@pkg/util/utilfn/streamtolines.go` around lines 23 - 25, The global const
maxLineLength is too large for all callers and should be scoped to RPC usage;
change the shared constant into a smaller safe default (e.g.,
defaultMaxLineLength) and add an RPC-specific limit (e.g., rpcMaxLineLength) or
an explicit constructor/parameter for StreamToLines and LineWriter so callers
can opt into the 64MB cap only for RPC streams; update StreamToLines and
LineWriter to accept a configurable maxLineLength parameter (or provide
NewStreamToLinesWithLimit / NewLineWriterWithLimit) and use defaultMaxLineLength
when not provided, reserving the 64MB value only for RPC-specific construction
paths.


func ReadLineWithTimeout(ch chan LineOutput, timeout time.Duration) (string, error) {
select {
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