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Factor methods out into ConversionManager

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This commit is contained in:
James Allen 2013-08-09 11:10:19 +01:00
parent 7e96933cf2
commit c5e7f14ba1
2 changed files with 68 additions and 52 deletions
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62
services/track-changes/app/coffee/ConversionManager.coffee Normal file
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@ -0,0 +1,62 @@
{db, ObjectId} = require "./mongojs"
ConcatManager = require "./ConcatManager"
module.exports = ConversionManager =
OPS_TO_LEAVE: 10
removeLatestCompressedUpdate: (doc_id, callback = (error) ->) ->
db.docHistory.update { doc_id: ObjectId(doc_id) }, { $pop: { docOps: 1 } }, callback
getLatestCompressedUpdate: (doc_id, callback = (error) ->) ->
db.docHistory.find { doc_id: ObjectId(doc_id) }, { docOps: { $slice: -1 } }, (error, history) ->
return callback(error) if error?
history = history[0] or { docOps: [] }
callback null, history.docOps.slice(-1)[0]
insertCompressedUpdates: (doc_id, updates, callback = (error) ->) ->
db.docHistory.update { doc_id: ObjectId(doc_id) }, { $push: { docOps: { $each: updates } } }, { upsert: true }, callback
trimLastRawUpdate: (doc_id, tailVersion, callback = (error) ->) ->
db.docOps.update { doc_id: ObjectId(doc_id) }, { $pop: { docOps: -1 }, $set: { tailVersion: tailVersion + 1 } }, callback
getLastRawUpdateAndVersion: (doc_id, callback = (error, update, currentVersion, tailVersion) ->) ->
db.docOps.find { doc_id: ObjectId(doc_id) }, { version: true, tailVersion: true, docOps: { $slice: 1 } }, (error, docs) ->
return callback(error) if error?
return callback(new Error("doc not found")) if docs.length == 0
doc = docs[0]
callback null, doc.docOps[0], doc.version, doc.tailVersion or 0
convertOldestRawUpdate: (doc_id, callback = (error, converted) ->) ->
ConversionManager.getLastRawUpdateAndVersion doc_id, (error, rawUpdate, currentVersion, tailVersion) ->
return callback(error) if error?
rawUpdates = ConcatManager.normalizeUpdate(rawUpdate)
if currentVersion - tailVersion > ConcatManager.OPS_TO_LEAVE
ConversonManager.getLatestCompressedUpdate doc_id, (error, lastCompressedUpdate) ->
return callback(error) if error?
removeAndModifyPreviousCompressedUpdate = (callback, compressedUpdates) ->
if lastCompressedUpdate?
compressedUpdates = [lastCompressedUpdate]
for rawUpdate in rawUpdates
lastCompressedUpdate = compressedUpdates.pop()
compressedUpdates = compressedUpdates.concat ConcatManager.concatTwoUpdates lastCompressedUpdate, rawUpdate
ConversionManager.removeLatestCompressedUpdate doc_id, (error) ->
return callback(error) if error?
callback null, compressUpdates
else
callback null, rawUpdates
removeAndModifyPreviousCompressedUpdate (error, newCompressedUpdates) ->
return callback(error) if error?
ConversionManager.insertCompressedUpdates doc_id, newCompressedUpdates, (error) ->
return callback(error) if error?
ConversionManager.trimLastRawUpdate doc_id, tailVersion, (error) ->
return callback(error) if error?
console.log "Pushed op", tailVersion
callback null, true
else
console.log "Up to date"
callback null, false

58
services/track-changes/compressHistory.coffee
View file

@ -1,26 +1,9 @@
{db, ObjectId} = require "./app/js/mongojs"
ConcatManager = require "./app/js/ConcatManager"
{db, ObjectId} = require "./app/coffee/mongojs"
ConversionManager = require "./app/coffee/ConversionManager"
doc_id = process.argv.pop()
console.log "DOC ID", doc_id
OPS_TO_LEAVE = 10
removeLatestCompressedUpdate = (doc_id, callback = (error) ->) ->
db.docHistory.update { doc_id: ObjectId(doc_id) }, { $pop: { docOps: 1 } }, callback
getLatestCompressedUpdate = (doc_id, callback = (error) ->) ->
db.docHistory.find { doc_id: ObjectId(doc_id) }, { docOps: { $slice: -1 } }, (error, history) ->
return callback(error) if error?
history = history[0] or { docOps: [] }
callback null, history.docOps.slice(-1)[0]
insertCompressedUpdates = (doc_id, updates, callback = (error) ->) ->
db.docHistory.update { doc_id: ObjectId(doc_id) }, { $push: { docOps: { $each: updates } } }, { upsert: true }, callback
trimLastRawUpdate = (doc_id, tailVersion, callback = (error) ->) ->
db.docOps.update { doc_id: ObjectId(doc_id) }, { $pop: { docOps: -1 }, $set: { tailVersion: tailVersion + 1 } }, callback
done = () ->
console.log "DONE! Here's the history:"
db.docHistory.find { doc_id: ObjectId(doc_id) }, (error, docs) ->
@ -35,40 +18,11 @@ done = () ->
process.exit()
do next = () ->
db.docOps.find { doc_id: ObjectId(doc_id) }, { version: true, tailVersion: true, docOps: { $slice: 1 } }, (error, docs) ->
ConversionManager.convertOldestRawUpdate doc_id, (error, converted) ->
throw error if error?
throw "doc not found" if docs.length < 1
doc = docs[0]
tailVersion = doc.tailVersion or 0
version = doc.version
rawUpdate = doc.docOps[0]
rawUpdates = ConcatManager.normalizeUpdate(rawUpdate)
if version - tailVersion > OPS_TO_LEAVE
getLatestCompressedUpdate doc_id, (error, lastCompressedUpdate) ->
throw error if error?
if lastCompressedUpdate?
compressedUpdates = [lastCompressedUpdate]
for rawUpdate in rawUpdates
lastCompressedUpdate = compressedUpdates.pop()
compressedUpdates = compressedUpdates.concat ConcatManager.concatTwoUpdates lastCompressedUpdate, rawUpdate
removeLatestCompressedUpdate doc_id, (error) ->
throw error if error?
insertCompressedUpdates doc_id, compressedUpdates, (error) ->
throw error if error?
trimLastRawUpdate doc_id, tailVersion, (error) ->
throw error if error?
console.log "Pushed compressed op"
next()
else
insertCompressedUpdates doc_id, rawUpdates, (error) ->
trimLastRawUpdate doc_id, tailVersion, (error) ->
throw error if error?
console.log "Pushed first op"
next()
if converted
next()
else
console.log "Up to date"
done()