internal/testlog: fix log output from sub-loggers #31539
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I also would like to modify the example unit test that I copied from the issue to be table-driven, but there doesn't appear to be a way to capture the |
fjl
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Apr 2, 2025
…handler reference as the bufHandler in the newly-instantiated logger instead of copying from parent
…st-logger to take T as an interface to enable log output capture in the unit test.
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sivaratrisrinivas
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Apr 21, 2025
When we instantiate a sub-logger via `go-ethereum/internal/testlog/logger.With`, we copy the reference to the `bufHandler` from the parent logger. However, internally, `go-ethereum/internal/testlog/logger.With` calls `log/slog/Logger.With` which creates a new handler instance (via `internal/bufHandler.WithAttrs`). This PR modifies sub-logger instantiation to use the newly-instantiated handler, instead of copying the reference from the parent instance. The type cast from `slog.Handler` to `*bufHandler` in `internal/testlog/Logger.With` is safe here because a `internal/testlog/Logger` can only be instantiated with a `*bufHandler` as the underlying handler type. Note, that I've also removed a pre-existing method that broke the above assumption. However, this method is not used in our codebase. I'm not sure if the assumption holds for forks of geth (e.g. optimism has modified the testlogger somewhat allowing test loggers to accept arbitrary handler types), but it seems okay to break API compatibility given that this is in the `internal` package. closes ethereum#31533
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Jul 3, 2025
When we instantiate a sub-logger via `go-ethereum/internal/testlog/logger.With`, we copy the reference to the `bufHandler` from the parent logger. However, internally, `go-ethereum/internal/testlog/logger.With` calls `log/slog/Logger.With` which creates a new handler instance (via `internal/bufHandler.WithAttrs`). This PR modifies sub-logger instantiation to use the newly-instantiated handler, instead of copying the reference from the parent instance. The type cast from `slog.Handler` to `*bufHandler` in `internal/testlog/Logger.With` is safe here because a `internal/testlog/Logger` can only be instantiated with a `*bufHandler` as the underlying handler type. Note, that I've also removed a pre-existing method that broke the above assumption. However, this method is not used in our codebase. I'm not sure if the assumption holds for forks of geth (e.g. optimism has modified the testlogger somewhat allowing test loggers to accept arbitrary handler types), but it seems okay to break API compatibility given that this is in the `internal` package. closes ethereum#31533
howjmay
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Aug 27, 2025
When we instantiate a sub-logger via `go-ethereum/internal/testlog/logger.With`, we copy the reference to the `bufHandler` from the parent logger. However, internally, `go-ethereum/internal/testlog/logger.With` calls `log/slog/Logger.With` which creates a new handler instance (via `internal/bufHandler.WithAttrs`). This PR modifies sub-logger instantiation to use the newly-instantiated handler, instead of copying the reference from the parent instance. The type cast from `slog.Handler` to `*bufHandler` in `internal/testlog/Logger.With` is safe here because a `internal/testlog/Logger` can only be instantiated with a `*bufHandler` as the underlying handler type. Note, that I've also removed a pre-existing method that broke the above assumption. However, this method is not used in our codebase. I'm not sure if the assumption holds for forks of geth (e.g. optimism has modified the testlogger somewhat allowing test loggers to accept arbitrary handler types), but it seems okay to break API compatibility given that this is in the `internal` package. closes ethereum#31533
gballet
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Sep 11, 2025
When we instantiate a sub-logger via `go-ethereum/internal/testlog/logger.With`, we copy the reference to the `bufHandler` from the parent logger. However, internally, `go-ethereum/internal/testlog/logger.With` calls `log/slog/Logger.With` which creates a new handler instance (via `internal/bufHandler.WithAttrs`). This PR modifies sub-logger instantiation to use the newly-instantiated handler, instead of copying the reference from the parent instance. The type cast from `slog.Handler` to `*bufHandler` in `internal/testlog/Logger.With` is safe here because a `internal/testlog/Logger` can only be instantiated with a `*bufHandler` as the underlying handler type. Note, that I've also removed a pre-existing method that broke the above assumption. However, this method is not used in our codebase. I'm not sure if the assumption holds for forks of geth (e.g. optimism has modified the testlogger somewhat allowing test loggers to accept arbitrary handler types), but it seems okay to break API compatibility given that this is in the `internal` package. closes ethereum#31533
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When we instantiate a sub-logger via
go-ethereum/internal/testlog/logger.With, we copy the reference to thebufHandlerfrom the parent logger. However, internally,go-ethereum/internal/testlog/logger.Withcallslog/slog/Logger.Withwhich creates a new handler instance (viainternal/bufHandler.WithAttrs).This PR modifies sub-logger instantiation to use the newly-instantiated handler, instead of copying the reference from the parent instance. The type cast from
slog.Handlerto*bufHandlerininternal/testlog/Logger.Withis safe here because ainternal/testlog/Loggercan only be instantiated with a*bufHandleras the underlying handler type.Note, that I've also removed a pre-existing method that broke the above assumption. However, this method is not used in our codebase.
I'm not sure if the assumption holds for forks of geth (e.g. optimism has modified the testlogger somewhat allowing test loggers to accept arbitrary handler types), but it seems okay to break API compatibility given that this is in the
internalpackage.closes #31533