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310 lines
12 KiB
310 lines
12 KiB
from collections import namedtuple
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import column
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import identifiers
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import logger
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log = logger.Logger(__name__, logger.INFO)
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# Prefix for transform columns created during imports.
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_import_transform_col_prefix = 'gristHelper_Import_'
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def _gen_colids(transform_rule):
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"""
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For a transform_rule with colIds = None,
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fills in colIds generated from labels.
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"""
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dest_cols = transform_rule["destCols"]
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if any(dc["colId"] for dc in dest_cols):
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raise ValueError("transform_rule already has colIds in _gen_colids")
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col_labels = [dest_col["label"] for dest_col in dest_cols]
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col_ids = identifiers.pick_col_ident_list(col_labels, avoid={'id'})
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for dest_col, col_id in zip(dest_cols, col_ids):
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dest_col["colId"] = col_id
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def _strip_prefixes(transform_rule):
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"If transform_rule has prefixed _col_ids, strips prefix"
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dest_cols = transform_rule["destCols"]
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for dest_col in dest_cols:
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colId = dest_col["colId"]
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if colId and colId.startswith(_import_transform_col_prefix):
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dest_col["colId"] = colId[len(_import_transform_col_prefix):]
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class ImportActions(object):
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def __init__(self, useractions, docmodel, engine):
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self._useractions = useractions
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self._docmodel = docmodel
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self._engine = engine
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########################
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## NOTES
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# transform_rule is an object like this: {
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# destCols: [ { colId, label, type, formula }, ... ],
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# ..., # other params unused in sandbox
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# }
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#
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# colId is defined if into_new_table, otherwise is None
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# GenImporterView gets a hidden table with a preview of the import data (~100 rows)
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# It adds formula cols and viewsections to the hidden table for the user to
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# preview and edit import options. GenImporterView can start with a default transform_rule
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# from table columns, or use one that's passed in (for reimporting).
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# client/components/Importer.ts then puts together transform_rule, which
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# specifies destination column formulas, types, labels, and colIds. It only contains colIds
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# if importing into an existing table, and they are sometimes prefixed with
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# _import_transform_col_prefix (if transform_rule comes from client)
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# TransformAndFinishImport gets the full hidden_table (reparsed) and a transform_rule,
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# (or can use a default one if it's not provided). It fills in colIds if necessary and
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# strips colId prefixes. It also skips creating some formula columns
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# (ones with trivial copy formulas) as an optimization.
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def _MakeDefaultTransformRule(self, hidden_table_id, dest_table_id):
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"""
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Makes a basic transform_rule.dest_cols copying all the source cols
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hidden_table_id: table with src data
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dest_table_id: table data is going to
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If dst_table is null, copy all src columns
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If dst_table exists, copy all dst columns, and make copy formulas if any names match
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returns transform_rule with only destCols filled in
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"""
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tables = self._docmodel.tables
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hidden_table_rec = tables.lookupOne(tableId=hidden_table_id)
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# will use these to set default formulas (if column names match in src and dest table)
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src_cols = {c.colId for c in hidden_table_rec.columns}
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target_table = tables.lookupOne(tableId=dest_table_id) if dest_table_id else hidden_table_rec
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target_cols = target_table.columns
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# makes dest_cols for each column in target_cols (defaults to same columns as hidden_table)
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#loop through visible, non-formula target columns
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dest_cols = []
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for c in target_cols:
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if column.is_visible_column(c.colId) and (not c.isFormula or c.formula == ""):
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dest_cols.append( {
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"label": c.label,
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"colId": c.colId if dest_table_id else None, #should be None if into new table
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"type": c.type,
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"formula": ("$" + c.colId) if (c.colId in src_cols) else ''
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})
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return {"destCols": dest_cols}
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# doesnt generate other fields of transform_rule, but sandbox only used destCols
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# Returns
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def _MakeImportTransformColumns(self, hidden_table_id, transform_rule, gen_all):
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"""
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Makes prefixed columns in the grist hidden import table (hidden_table_id)
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hidden_table_id: id of temporary hidden table in which columns are made
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transform_rule: defines columns to make (colids must be filled in!)
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gen_all: If true, all columns will be generated
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If false, formulas that just copy will be skipped, and blank formulas will be skipped
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returns list of newly created colrefs (rowids into _grist_Tables_column)
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"""
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tables = self._docmodel.tables
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hidden_table_rec = tables.lookupOne(tableId=hidden_table_id)
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src_cols = {c.colId for c in hidden_table_rec.columns}
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log.debug("destCols:" + repr(transform_rule['destCols']))
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#wrap dest_cols as namedtuples, to allow access like 'dest_col.param'
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dest_cols = [namedtuple('col', c.keys())(*c.values()) for c in transform_rule['destCols']]
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log.debug("_MakeImportTransformColumns: {}".format("gen_all" if gen_all else "optimize"))
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#create prefixed formula column for each of dest_cols
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#take formula from transform_rule
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new_cols = []
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for c in dest_cols:
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# skip copy and blank columns (unless gen_all)
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formula = c.formula.strip()
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isCopyFormula = (formula.startswith("$") and formula[1:] in src_cols)
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isBlankFormula = not formula
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if gen_all or (not isCopyFormula and not isBlankFormula):
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#if colId specified, use that. Else label is fine
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new_col_id = _import_transform_col_prefix + (c.colId or c.label)
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new_col_spec = {
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"label": c.label,
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"type": c.type,
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"isFormula": True,
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"formula": c.formula}
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result = self._useractions.doAddColumn(hidden_table_id, new_col_id, new_col_spec)
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new_cols.append(result["colRef"])
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return new_cols
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def DoGenImporterView(self, source_table_id, dest_table_id, transform_rule = None):
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"""
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Generates viewsections/formula columns for importer
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source_table_id: id of temporary hidden table, data parsed from data source
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dest_table_id: id of table to import to, or None for new table
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transform_rule: transform_rule to reuse (if it still applies), if None will generate new one
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Removes old transform viewSection and columns for source_table_id, and creates new ones that
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match the destination table.
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Returns the rowId of the newly added section or 0 if no source table (source_table_id
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can be None in case of importing empty file).
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Creates formula columns for transforms (match columns in dest table)
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"""
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tables = self._docmodel.tables
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src_table_rec = tables.lookupOne(tableId=source_table_id)
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# for new table, dest_table_id is None
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dst_table_rec = tables.lookupOne(tableId=dest_table_id) if dest_table_id else src_table_rec
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# ======== Cleanup old sections/columns
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# Transform sections are created without a parent View, so we delete all such sections here.
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old_sections = [s for s in src_table_rec.viewSections if not s.parentId]
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self._docmodel.remove(old_sections)
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# Transform columns are those that start with a special prefix.
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old_cols = [c for c in src_table_rec.columns
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if c.colId.startswith(_import_transform_col_prefix)]
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self._docmodel.remove(old_cols)
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#======== Prepare/normalize transform_rule, Create new formula columns
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# Defaults to duplicating dest_table columns (or src_table columns for a new table)
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# If transform_rule provided, use that
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if transform_rule is None:
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transform_rule = self._MakeDefaultTransformRule(source_table_id, dest_table_id)
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else: #ensure prefixes, colIds are correct
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_strip_prefixes(transform_rule)
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if not dest_table_id: # into new table: 'colId's are undefined
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_gen_colids(transform_rule)
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else:
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if None in (dc["colId"] for dc in transform_rule["destCols"]):
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errstr = "colIds must be defined in transform_rule for importing into existing table: "
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raise ValueError(errstr + repr(transform_rule))
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new_cols = self._MakeImportTransformColumns(source_table_id, transform_rule, gen_all=True)
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# we want to generate all columns so user can see them and edit
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#========= Create new transform view section.
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new_section = self._docmodel.add(self._docmodel.view_sections,
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tableRef=src_table_rec.id,
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parentKey='record',
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borderWidth=1, defaultWidth=100,
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sortColRefs='[]')[0]
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self._docmodel.add(new_section.fields, colRef=new_cols)
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return new_section.id
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def DoTransformAndFinishImport(self, hidden_table_id, dest_table_id,
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into_new_table, transform_rule):
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"""
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Finishes import into new or existing table depending on flag 'into_new_table'
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Returns destination table id. (new or existing)
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"""
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hidden_table = self._engine.tables[hidden_table_id]
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hidden_table_rec = self._docmodel.tables.lookupOne(tableId=hidden_table_id)
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src_cols = {c.colId for c in hidden_table_rec.columns}
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log.debug("Starting TransformAndFinishImport, dest_cols:\n "
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+ str(transform_rule["destCols"] if transform_rule else "None"))
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log.debug("hidden_table_id:" + hidden_table_id)
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log.debug("hidden table columns: "
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+ str([(a.colId, a.label, a.type) for a in hidden_table_rec.columns]))
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log.debug("dest_table_id: "
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+ str(dest_table_id) + ('(NEW)' if into_new_table else '(Existing)'))
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# === fill in blank transform rule
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if not transform_rule:
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transform_dest = None if into_new_table else dest_table_id
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transform_rule = self._MakeDefaultTransformRule(hidden_table_id, transform_dest)
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dest_cols = transform_rule["destCols"]
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# === Normalize transform rule (gen colids)
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_strip_prefixes(transform_rule) #when transform_rule from client, colIds will be prefixed
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if into_new_table: # 'colId's are undefined if making new table
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_gen_colids(transform_rule)
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else:
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if None in (dc["colId"] for dc in dest_cols):
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errstr = "colIds must be defined in transform_rule for importing into existing table: "
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raise ValueError(errstr + repr(transform_rule))
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log.debug("Normalized dest_cols:\n " + str(dest_cols))
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# ======== Make and update formula columns
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# Make columns from transform_rule (now with filled-in colIds colIds),
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# gen_all false skips copy columns (faster)
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new_cols = self._MakeImportTransformColumns(hidden_table_id, transform_rule, gen_all=False)
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self._engine._bring_all_up_to_date()
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# ========= Fetch Data for each col
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# (either copying, blank, or from formula column)
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row_ids = list(hidden_table.row_ids) #fetch row_ids now, before we remove hidden_table
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log.debug("num rows: " + str(len(row_ids)))
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column_data = {} # { col:[values...], ... }
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for curr_col in dest_cols:
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formula = curr_col["formula"].strip()
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if formula:
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if (formula.startswith("$") and formula[1:] in src_cols): #copy formula
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src_col_id = formula[1:]
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else: #normal formula, fetch from prefix column
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src_col_id = _import_transform_col_prefix + curr_col["colId"]
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log.debug("Copying from: " + src_col_id)
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column_data[curr_col["colId"]] = map(hidden_table.get_column(src_col_id).raw_get, row_ids)
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# ========= Cleanup, Prepare new table (if needed), insert data
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self._useractions.RemoveTable(hidden_table_id)
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if into_new_table:
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col_specs = [ {'type': curr_col['type'], 'id': curr_col['colId'], 'label': curr_col['label']}
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for curr_col in dest_cols]
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log.debug("Making new table. Columns:\n " + str(col_specs))
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new_table = self._useractions.AddTable(dest_table_id, col_specs)
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dest_table_id = new_table['table_id']
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self._useractions.BulkAddRecord(dest_table_id, [None] * len(row_ids), column_data)
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log.debug("Finishing TransformAndFinishImport")
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return dest_table_id
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