/
compilation.py
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/
compilation.py
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import itertools
import os
from collections import defaultdict
import dbt.utils
import dbt.include
import dbt.tracking
from dbt.node_types import NodeType
from dbt.linker import Linker
import dbt.context.runtime
import dbt.contracts.project
import dbt.exceptions
import dbt.flags
import dbt.config
from dbt.contracts.graph.compiled import InjectedCTE, COMPILED_TYPES
from dbt.contracts.graph.parsed import ParsedNode
from dbt.logger import GLOBAL_LOGGER as logger
graph_file_name = 'graph.gpickle'
def _compiled_type_for(model: ParsedNode):
if model.resource_type not in COMPILED_TYPES:
raise dbt.exceptions.InternalException(
'Asked to compile {} node, but it has no compiled form'
.format(model.resource_type)
)
return COMPILED_TYPES[model.resource_type]
def print_compile_stats(stats):
names = {
NodeType.Model: 'model',
NodeType.Test: 'test',
NodeType.Snapshot: 'snapshot',
NodeType.Analysis: 'analyse',
NodeType.Macro: 'macro',
NodeType.Operation: 'operation',
NodeType.Seed: 'seed file',
NodeType.Source: 'source',
}
results = {k: 0 for k in names.keys()}
results.update(stats)
stat_line = ", ".join([
dbt.utils.pluralize(ct, names.get(t)) for t, ct in results.items()
if t in names
])
logger.info("Found {}".format(stat_line))
def _add_prepended_cte(prepended_ctes, new_cte):
for cte in prepended_ctes:
if cte.id == new_cte.id:
cte.sql = new_cte.sql
return
prepended_ctes.append(new_cte)
def _extend_prepended_ctes(prepended_ctes, new_prepended_ctes):
for new_cte in new_prepended_ctes:
_add_prepended_cte(prepended_ctes, new_cte)
def prepend_ctes(model, manifest):
model, _, manifest = recursively_prepend_ctes(model, manifest)
return (model, manifest)
def recursively_prepend_ctes(model, manifest):
if model.extra_ctes_injected:
return (model, model.extra_ctes, manifest)
if dbt.flags.STRICT_MODE:
if not isinstance(model, tuple(COMPILED_TYPES.values())):
raise dbt.exceptions.InternalException(
'Bad model type: {}'.format(type(model))
)
prepended_ctes = []
for cte in model.extra_ctes:
cte_id = cte.id
cte_to_add = manifest.nodes.get(cte_id)
cte_to_add, new_prepended_ctes, manifest = recursively_prepend_ctes(
cte_to_add, manifest)
_extend_prepended_ctes(prepended_ctes, new_prepended_ctes)
new_cte_name = '__dbt__CTE__{}'.format(cte_to_add.name)
sql = ' {} as (\n{}\n)'.format(new_cte_name, cte_to_add.compiled_sql)
_add_prepended_cte(prepended_ctes, InjectedCTE(id=cte_id, sql=sql))
model.prepend_ctes(prepended_ctes)
manifest.update_node(model)
return (model, prepended_ctes, manifest)
class Compiler:
def __init__(self, config):
self.config = config
def initialize(self):
dbt.clients.system.make_directory(self.config.target_path)
dbt.clients.system.make_directory(self.config.modules_path)
def compile_node(self, node, manifest, extra_context=None):
if extra_context is None:
extra_context = {}
logger.debug("Compiling {}".format(node.unique_id))
data = node.to_dict()
data.update({
'compiled': False,
'compiled_sql': None,
'extra_ctes_injected': False,
'extra_ctes': [],
'injected_sql': None,
})
compiled_node = _compiled_type_for(node).from_dict(data)
context = dbt.context.runtime.generate(
compiled_node, self.config, manifest)
context.update(extra_context)
compiled_node.compiled_sql = dbt.clients.jinja.get_rendered(
node.raw_sql,
context,
node)
compiled_node.compiled = True
injected_node, _ = prepend_ctes(compiled_node, manifest)
should_wrap = {NodeType.Test, NodeType.Operation}
if injected_node.resource_type in should_wrap:
# data tests get wrapped in count(*)
# TODO : move this somewhere more reasonable
if 'data' in injected_node.tags and \
injected_node.resource_type == NodeType.Test:
injected_node.wrapped_sql = (
"select count(*) as errors "
"from (\n{test_sql}\n) sbq").format(
test_sql=injected_node.injected_sql)
else:
# don't wrap schema tests or analyses.
injected_node.wrapped_sql = injected_node.injected_sql
elif injected_node.resource_type == NodeType.Snapshot:
# unfortunately we do everything automagically for
# snapshots. in the future it'd be nice to generate
# the SQL at the parser level.
pass
elif(injected_node.resource_type == NodeType.Model and
injected_node.get_materialization() == 'ephemeral'):
pass
else:
injected_node.wrapped_sql = None
return injected_node
def write_graph_file(self, linker, manifest):
filename = graph_file_name
graph_path = os.path.join(self.config.target_path, filename)
if dbt.flags.WRITE_JSON:
linker.write_graph(graph_path, manifest)
def link_node(self, linker, node, manifest):
linker.add_node(node.unique_id)
for dependency in node.depends_on_nodes:
if manifest.nodes.get(dependency):
linker.dependency(
node.unique_id,
(manifest.nodes.get(dependency).unique_id))
else:
dbt.exceptions.dependency_not_found(node, dependency)
def link_graph(self, linker, manifest):
for node in manifest.nodes.values():
self.link_node(linker, node, manifest)
cycle = linker.find_cycles()
if cycle:
raise RuntimeError("Found a cycle: {}".format(cycle))
def compile(self, manifest, write=True):
linker = Linker()
self.link_graph(linker, manifest)
stats = defaultdict(int)
for node_name, node in itertools.chain(
manifest.nodes.items(),
manifest.macros.items()):
stats[node.resource_type] += 1
if write:
self.write_graph_file(linker, manifest)
print_compile_stats(stats)
return linker
def compile_manifest(config, manifest, write=True):
compiler = Compiler(config)
compiler.initialize()
return compiler.compile(manifest, write=write)
def _is_writable(node):
if not node.injected_sql:
return False
if node.resource_type == NodeType.Snapshot:
return False
return True
def compile_node(adapter, config, node, manifest, extra_context, write=True):
compiler = Compiler(config)
node = compiler.compile_node(node, manifest, extra_context)
node = _inject_runtime_config(adapter, node, extra_context)
if write and _is_writable(node):
logger.debug('Writing injected SQL for node "{}"'.format(
node.unique_id))
written_path = dbt.writer.write_node(
node,
config.target_path,
'compiled',
node.injected_sql)
node.build_path = written_path
return node
def _inject_runtime_config(adapter, node, extra_context):
wrapped_sql = node.wrapped_sql
context = _node_context(adapter, node)
context.update(extra_context)
sql = dbt.clients.jinja.get_rendered(wrapped_sql, context)
node.wrapped_sql = sql
return node
def _node_context(adapter, node):
return {
"run_started_at": dbt.tracking.active_user.run_started_at,
"invocation_id": dbt.tracking.active_user.invocation_id,
}