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License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

This patch is the part of trickledag work which is similar to the
merkledag work in commit 474b77a2bdb1c ("importer: remove `UnixfsNode`
from the balanced builder"). Two helper functions(fillTrickleRecFSNode
and FillFSNodeLayer) is introduced temporarily for modifing the Layout
functions. These two funtions will be removed when all the code of
UnixfsNode is removed in trickledag.go.

Test ipfs add and get commands to check whether get the same hash of
file after the code changes.

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

After fsNodeType in NewLeafNode is supported by commit 85897b3f89301
("dag: add fsNodeType in NewLeafNode and NewLeafDataNode"). Move
comments in NewLeafNode to importer/balanced/builder.go to clarify
why TFile is used by balanced builder as leaves.

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

NewLeafNode and NewLeafDataNode is introduced in commit 474b77a2bdb1c
("importer: remove `UnixfsNode` from the balanced builder"). It is
intended to return ipfs.Node instead of UnixfsNode. But it only
support creating the TFile leaf node for merkledag.

This commit add fsNodeType to above two functions and update the code
in dagbuild.go. Further patches of trickledag will make use of them
and pass TRaw to create leaf node.

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

Fix value of roughLinkSize. Add default value of DefaultLinksPerBlock.
And delete calc_test.go as it is deleted in commit bc79ae17
("refactor importer package with trickle and balanced dag generation")

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

A batching DAG service is forced onto the
users of the importers, but they could just wrap
the given DAGSerice in the batching one to get the same
functionality (remembering to Close it at the end of the
proccess).

As detailed in #27, the importers should not be making choices
about what DAGService is the right one to use and wrapping the
given one.

This change requires wrapping the DAGService in go-ipfs into
ipld.Batch. and closing it when Finishing the adding process.

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>