5 Commits (cb3dbc92f9f4f6e4c4a0e3598804da4d5189da25)

Author	SHA1	Message	Date
Daniel Nephin	d11674dbb7	decode: do not modify the source data in HookTranslateKeys ... This was causing a 'fatal error: concurrent map iteration and map write' with gateways	5 years ago
Daniel Nephin	66b72039d4	decode: Only recursively unslice when the target is an interface{}	5 years ago
Daniel Nephin	a46ce3d841	decode: recursively unslice opaque config ... Also handle []interface{} in HookWeakDecodeFromSlice Without this change only the top level []map[string]interface{} will be unpacked as a single item. With this change any nested config will be unpacked.	5 years ago
Daniel Nephin	75cbbe2702	config: add HookWeakDecodeFromSlice ... Currently opaque config blocks (config entries, and CA provider config) are modified by PatchSliceOfMaps, making it impossible for these opaque config sections to contain slices of maps. In order to fix this problem, any lazy-decoding of these blocks needs to support weak decoding of []map[string]interface{} to a struct type before PatchSliceOfMaps is replaces. This is necessary because these config blobs are persisted, and during an upgrade an older version of Consul could read one of the new configuration values, which would cause an error. To support the upgrade path, this commit first introduces the new hooks for weak decoding of []map[string]interface{} and uses them only in the lazy-decode paths. That way, in a future release, new style configuration will be supported by the older version of Consul. This decode hook has a number of advantages: 1. It no longer panics. It allows mapstructure to report the error 2. It no longer requires the user to declare which fields are slices of structs. It can deduce that information from the 'to' value. 3. It will make it possible to preserve opaque configuration, allowing for structured opaque config.	5 years ago
Daniel Nephin	1a039393f5	config: add HookTranslteKeys ... This hook replaces lib.TranslateKeys and has a number of advantages: 1. Primarily, aliases for fields are defined on the field itself, making the aliases much easier to maintain, and more obvious to the reader. 2. TranslateKeys translation rules are not aware of structure. It could very easily incorrectly translate a key on one struct that was intended to be a translation rule for a completely different struct, leading to very hard to debug errors. The hook removes the need for the unexpected "translation rule is an empty string to indicate stop traversal" special case. 3. TranslateKeys attempts to duplicate a bunch of tree traversal logic that already exists in mapstructure. Using mapstructure for traversal removes the need to traverse the entire structure multiple times, and makes the behaviour more obvious to the reader. This change is being made to enable a future change of replacing PatchSliceOfMaps. TranslateKeys sits in between PatchSliceOfMaps and mapstructure.Decode, so it must be converted to a hook first, before PatchSliceOfMaps can be replaced by a decode hook.	5 years ago