commit fba43cf3b50b88b7debad0f4d510df691de842ff
Author: Rafa de la Torre <rtorre@cartodb.com>
Date:   Wed Apr 6 20:03:04 2016 +0200

    Initial commit with what I think we need

diff --git a/.gitignore b/.gitignore
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+.DS_Store
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+# Development process
+
+Please read the Working Process/Quickstart Guide in [[README.md]] first.
+
+For any modification of the observatory-extension, such as adding new features,
+refactoring or bug-fixing, a topic branch must be created out of the `develop`
+branch and be used for the development process.
+
+Modifications are done inside `src/pg/sql`.
+
+Take into account:
+
+*  Tests must be added for any new functionality
+   (inside `src/pg/test` as well as to
+   detect any bugs that are being fixed.
+*  Add or modify the corresponding documentation files in the `doc` folder.
+*  Naming Conventions: we will use CamelCase with a prefix, as it is done in postgis. E.g: `OBS_GetSegmentationSnapshot`
+   Prefix function names intended for public use with `OBS_`
+   and private functions (to be used only internally inside
+   the extension)  with `_OBS_`.
+
+Once the code is ready to be tested, update the local development installation
+with `sudo make install`.
+This will update the 'dev' version of the extension in `src/pg/` and
+make it available to PostgreSQL.
+
+Run the tests with `make test`.
+
+Update extension in a working database with:
+
+* `ALTER EXTENSION observatory VERSION TO 'current';`
+  `ALTER EXTENSION observatory VERSION TO 'dev';`
+
+Note: we keep the current development version install as 'dev' always;
+we update through the 'current' alias to allow changing the extension
+contents but not the version identifier. This will fail if the
+changes involve incompatible function changes such as a different
+return type; in that case the offending function (or the whole extension)
+should be dropped manually before the update.
+
+If the extension has not previously been installed in a database,
+it can be installed directly with:
+
+* `CREATE EXTENSION observatory WITH VERSION 'dev';`
+
+Before proceeding to the release process a peer review of the code is
+a must.
+
+Once the feature or bugfix is completed and all the tests are passing
+a Pull-Request shall be created on the topic branch, reviewed by a peer
+and then merged back into the `develop` branch when all CI tests pass.
+
+When the changes in the `develop` branch are to be released in a new
+version of the extension, a PR must be created on the `develop` branch.
+
+The release manage will take hold of the PR at this moment to proceed
+to the release process for a new revision of the extension.
+
+## Relevant development tasks available in the Makefile
+
+```
+* `make help` show a short description of the available targets
+
+* `sudo make install` will generate the extension scripts for the development
+  version ('dev'/'current').
+  Intended for use by developers.
+
+* `make test` will run the tests for the installed development extension.
+  Intended for use by developers.
+```
diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+Copyright (c) 2016, CartoDB
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Makefile b/Makefile
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+++ b/Makefile
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+include ./Makefile.global
+
+EXT_DIR = src/pg
+
+.PHONY: install
+.PHONY: run_tests
+.PHONY: release
+.PHONY: deploy
+
+# Generate and install developmet versions of the extension.
+# The extension is named 'dev' with a 'current' alias for easily upgrading.
+# It requires sudo.
+install: ## Generate and install development version of the extension; requires sudo.
+	$(MAKE) -C $(EXT_DIR) install
+
+# Run the tests for the installed development extension.
+test:   ## Run the tests for the development version of the extension
+	$(MAKE) -C $(EXT_DIR) test
+
+# Generate a new release into release
+release: ## Generate a new release of the extension. Only for telease manager
+	$(MAKE) -C $(EXT_DIR) release
+
+# Install the current release.
+# It requires sudo.
+# Use the RELEASE_VERSION environment variable to deploy a specific version:
+#     sudo make deploy RELEASE_VERSION=1.0.0
+deploy: ## Deploy a released extension. Only for release manager. Requires sudo.
+	$(MAKE) -C $(EXT_DIR) deploy
+
+# Cleanup development extension script files
+clean-dev: ## clean up development extension script files
+	rm -f src/pg/$(EXTENSION)--*.sql
+
+# Cleanup all releases
+clean-releases: ## clean up all releases
+	rm -f release/$(EXTENSION)--*.sql
+	rm -f release/$(EXTENSION).control
+
+# Cleanup current/specific version
+clean-release: ## clean up current release
+	rm -f release/$(RELEASE_VERSION)--*.sql
+
+# Cleanup all virtual environments
+clean-environments: ## clean up all virtual environments
+	rm -rf envs/*
+
+clean-all: clean-dev clean-release clean-environments
+
+help:
+	@IFS=$$'\n' ; \
+	help_lines=(`fgrep -h "##" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -e 's/\\$$//'`); \
+	for help_line in $${help_lines[@]}; do \
+		IFS=$$'#' ; \
+		help_split=($$help_line) ; \
+		help_command=`echo $${help_split[0]} | sed -e 's/^ *//' -e 's/ *$$//'` ; \
+		help_info=`echo $${help_split[2]} | sed -e 's/^ *//' -e 's/ *$$//'` ; \
+		printf "%-30s %s\n" $$help_command $$help_info ; \
+	done
diff --git a/Makefile.global b/Makefile.global
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+++ b/Makefile.global
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+SELF_DIR         := $(dir $(lastword $(MAKEFILE_LIST)))
+EXTENSION        = observatory
+EXTVERSION       = $(shell grep default_version $(SELF_DIR)/src/pg/$(EXTENSION).control | sed -e "s/default_version[[:space:]]*=[[:space:]]*'\([^']*\)'/\1/")
+RELEASE_VERSION ?= $(EXTVERSION)
+SED              = sed
diff --git a/NEWS.md b/NEWS.md
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+++ b/NEWS.md
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+0.0.1 (open date)
+------------------
+* First iteration of `OBS_GetDemographicSnapshot(location Geometry(Point,4326))`;
diff --git a/README.md b/README.md
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+++ b/README.md
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+# Observatory extension
+
+CartoDB extension that implements the functions needed by the Observatory Service.
+
+## Code organization
+
+* *doc* documentation
+* *src* source code
+* - *src/pg* contains the PostgreSQL extension source code
+* *release* reseleased versions
+
+# Development workflow
+
+We distinguish two roles regarding the development cycle:
+
+* *developers* will implement new functionality and bugfixes into
+  the codebase and will request for new releases of the extension.
+* A *release manager* will attend these requests and will handle
+  the release process. The release process is sequential:
+  no concurrent releases will ever be in the works.
+
+We use the default `develop` branch as the basis for development.
+The `master` branch is used to merge and tag releases to be
+deployed in production.
+
+Developers shall create a new topic branch from `develop` for any new feature
+or bugfix and commit their changes to it and eventually merge back into
+the `develop` branch. When a new release is required a Pull Request
+will be open against the `develop` branch.
+
+The `develop` pull requests will be handled by the release manage,
+who will merge into master where new releases are prepared and tagged.
+The `master` branch is the sole responsibility of the release masters
+and developers must not commit or merge into it.
+
+## Development Guidelines
+
+For a detailed description of the development process please see
+the [[CONTRIBUTING.md]] guide.
+
+Any modification to the source code
+shall always be done in a topic branch created from the `develop` branch.
+
+Tests, documentation and peer code reviews are required for all
+modifications.
+
+The tests (both for SQL and Python) are executed by running,
+from the top directory:
+
+```
+sudo make install
+make test
+```
+## Release
+
+The release and deployment process is described in the
+[[RELEASE.md]] guide and it is the responsibility of the designated
+release manager.
diff --git a/RELEASE.md b/RELEASE.md
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+++ b/RELEASE.md
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+# Release & Deployment Process
+
+Please read the Working Process/Quickstart Guide in [README.md]]
+and the Development guidelines in [[CONTRIBUTING.md]].
+
+The release process of a new version of the extension
+shall be performed by the designated *Release Manager*.
+
+Having checked PR to be released it shall be
+merged back into the `master` branch to prepare the new release.
+
+The version number in `pg/observatory.control` must first be updated.
+To do so [Semantic Versioning 2.0](http://semver.org/) is in order.
+
+Thew `NEWS.md` will be updated.
+
+The next command must be executed to produce the main installation
+script for the new release, `release/observatory--X.Y.Z.sql` and
+also to copy the python package to `release/python/X.Y.Z/observatory`.
+
+```
+make release
+```
+
+Then, the release manager shall produce upgrade and downgrade scripts
+to migrate to/from the previous release. In the case of minor/patch
+releases this simply consist in extracting the functions that have changed
+and placing them in the proper `release/observatory--X.Y.Z--A.B.C.sql`
+file.
+
+The new release can be deployed for staging/smoke tests with this command:
+
+```
+sudo make deploy
+```
+
+This will copy the current 'X.Y.Z' released version of the extension to
+PostgreSQL.
+
+The `sudo make deploy` operation can be also used for installing
+the new version after it has been released.
+
+To install a specific version 'X.Y.Z' different from the current one
+(which must be present in `releases/`) you can:
+
+```
+sudo make deploy RELEASE_VERSION=X.Y.Z
+```
+
+
+## Relevant release & deployment tasks available in the Makefile
+
+```
+* `make help` show a short description of the available targets
+
+* `make release` will generate a new release (version number defined in
+  `src/pg/observatory.control`) into `release/`.
+  Intended for use by the release manager.
+
+* `sudo make deploy` will install the current release X.Y.Z from the
+  `release/` files into PostgreSQL and a Python virtual environment
+  `envs/X.Y.Z`.
+  Intended for use by the release manager and deployment jobs.
+
+* `sudo make deploy RELEASE_VERSION=X.Y.Z` will install specified version
+  previously generated in `release/`
+  into PostgreSQL and a Python virtual environment `envs/X.Y.Z`.
+  Intended for use by the release manager and deployment jobs.
+```
diff --git a/doc/.gitkeep b/doc/.gitkeep
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diff --git a/release/.gitkeep b/release/.gitkeep
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diff --git a/src/pg/Makefile b/src/pg/Makefile
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--- /dev/null
+++ b/src/pg/Makefile
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+include ../../Makefile.global
+
+# Development tasks:
+#
+# * install generates the control & script files into src/pg/
+#   and installs then into the PostgreSQL extensions directory;
+#   requires sudo. In additionof the current development version
+#   named 'dev', an alias 'current' is generating for ease of
+#   update (upgrade to 'current', then to 'dev').
+# * test runs the tests for the currently generated Development
+#   extension.
+
+DATA         = $(EXTENSION)--dev.sql \
+	             $(EXTENSION)--current--dev.sql \
+	             $(EXTENSION)--dev--current.sql
+
+SOURCES_DATA_DIR = sql
+SOURCES_DATA = $(wildcard $(SOURCES_DATA_DIR)/*.sql)
+
+
+REPLACEMENTS = -e 's/@@VERSION@@/$(EXTVERSION)/g'
+
+$(DATA): $(SOURCES_DATA)
+	$(SED) $(REPLACEMENTS) $(SOURCES_DATA_DIR)/*.sql > $@
+
+TEST_DIR = test
+REGRESS = $(notdir $(basename $(wildcard $(TEST_DIR)/sql/*test.sql)))
+REGRESS_OPTS = --inputdir='$(TEST_DIR)' --outputdir='$(TEST_DIR)'
+
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+
+# This seems to be needed at least for PG 9.3.11
+all: $(DATA)
+
+test: export PGUSER=postgres
+test: installcheck
+
+# Release tasks
+
+../../release/$(EXTENSION).control: $(EXTENSION).control
+	cp $< $@
+
+# Prepare new release from the currently installed development version,
+# for the current version X.Y.Z (defined in the control file)
+# producing the extension script and control files in releases/
+release: ../../release/$(EXTENSION).control $(SOURCES_DATA)
+	$(SED) $(REPLACEMENTS) $(SOURCES_DATA_DIR)/*.sql > ../../release/$(EXTENSION)--$(EXTVERSION).sql
+
+# Install the current relese into the PostgreSQL extensions directory
+deploy:
+	$(INSTALL_DATA) ../../release/$(EXTENSION).control '$(DESTDIR)$(datadir)/extension/'
+	$(INSTALL_DATA) ../../release/*.sql '$(DESTDIR)$(datadir)/extension/'
diff --git a/src/pg/observatory.control b/src/pg/observatory.control
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+++ b/src/pg/observatory.control
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+comment = 'CartoDB Observatory backend extension'
+default_version = '0.0.1'
+requires = 'postgis, cartodb'
+superuser = true
+schema = cdb_observatory
diff --git a/src/pg/sql/00_header.sql b/src/pg/sql/00_header.sql
new file mode 100644
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--- /dev/null
+++ b/src/pg/sql/00_header.sql
@@ -0,0 +1,3 @@
+--DO NOT MODIFY THIS FILE, IT IS GENERATED AUTOMATICALLY FROM SOURCES
+-- Complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION observatory" to load this file. \quit
diff --git a/src/pg/sql/10_version.sql b/src/pg/sql/10_version.sql
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--- /dev/null
+++ b/src/pg/sql/10_version.sql
@@ -0,0 +1,12 @@
+-- Version number of the extension release
+CREATE OR REPLACE FUNCTION cdb_observatory_version()
+RETURNS text AS $$
+  SELECT '@@VERSION@@'::text;
+$$ language 'sql' STABLE STRICT;
+
+-- Internal identifier of the installed extension instence
+-- e.g. 'dev' for current development version
+CREATE OR REPLACE FUNCTION _cdb_observatory_internal_version()
+RETURNS text AS $$
+  SELECT installed_version FROM pg_available_extensions where name='observatory' and pg_available_extensions IS NOT NULL;
+$$ language 'sql' STABLE STRICT;
diff --git a/src/pg/sql/90_permissions.sql b/src/pg/sql/90_permissions.sql
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+++ b/src/pg/sql/90_permissions.sql
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+-- Placeholder for permission tweaks at creation time.
+-- Make sure by default there are no permissions for publicuser
+-- NOTE: this happens at extension creation time, as part of an implicit transaction.
+-- REVOKE ALL PRIVILEGES ON SCHEMA cdb_observatory FROM PUBLIC, publicuser CASCADE;
+
+-- Grant permissions on the schema to publicuser (but just the schema)
+-- GRANT USAGE ON SCHEMA cdb_crankshaft TO publicuser;
+
+-- Revoke execute permissions on all functions in the schema by default
+-- REVOKE EXECUTE ON ALL FUNCTIONS IN SCHEMA cdb_observatory FROM PUBLIC, publicuser;
diff --git a/src/pg/test/expected/01_install_test.out b/src/pg/test/expected/01_install_test.out
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--- /dev/null
+++ b/src/pg/test/expected/01_install_test.out
@@ -0,0 +1,5 @@
+-- Install dependencies
+CREATE EXTENSION postgis;
+CREATE EXTENSION cartodb;
+-- Install the extension
+CREATE EXTENSION observatory VERSION 'dev';
diff --git a/src/pg/test/fixtures/.gitkeep b/src/pg/test/fixtures/.gitkeep
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index 0000000..e69de29
diff --git a/src/pg/test/sql/01_install_test.sql b/src/pg/test/sql/01_install_test.sql
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--- /dev/null
+++ b/src/pg/test/sql/01_install_test.sql
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+-- Install dependencies
+CREATE EXTENSION postgis;
+CREATE EXTENSION cartodb;
+
+-- Install the extension
+CREATE EXTENSION observatory VERSION 'dev';
diff --git a/src/pg/test/sql/90_permissions.sql b/src/pg/test/sql/90_permissions.sql
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