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channeldb: added channeldb versioning

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In this commit the upgrade mechanism for database was added which makes he current schema rigid and upgradeable. Additional bucket 'metaBucket' was added which stores
    key that house meta-data related to the current/version state of the database. 'createChannelDB' was modified to create this new bucket+key during initializing. Also
    backup logic was added which makes a complete copy of the current database during migration process and restore the previous version of database if migration failed.
This commit is contained in:
Andrey Samokhvalov
2016-11-22 23:50:27 +03:00
committed by Olaoluwa Osuntokun
parent 2bf5794645
commit c53ea091dd
5 changed files with 552 additions and 8 deletions
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channeldb/error.go
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@@ -14,4 +14,5 @@ var (
ErrDuplicateInvoice = fmt.Errorf("invoice with payment hash already exists")
ErrNodeNotFound = fmt.Errorf("link node with target identity not found")
ErrMetaNotFound = fmt.Errorf("unable to locate meta information")
)