feat(libpostal): add support for libpostal over http service, adapter…

… pattern et al.

lib/analyze.js

@@ -1,38 +1,18 @@
+const postal = require('../libpostal/client');
+
 // constants for controlling how we parse ranges, eg: 'α-β'
 // some ranges such as '1-7' are ambiguous; it could mean 'apt 7, no 1'; or
 // it could mean 'apt 1, no 7'; or could even be a valid range 'one to seven'.
 // note: these values provide a means of setting some sane defaults for which
 // ranges we try to parse and which ones we leave.
-var MIN_RANGE = 1; // the miniumum amount β is higher than α
-var MAX_RANGE = 6; // the maximum amount β is higher than α
-var MIN_RANGE_HOUSENUMBER = 10; // the minimum acceptible value for both α and β
-
-/*
- * Return the appropriate version of node-postal
- */
-
-var _nodepostal_module;
-function get_libpostal() {
-  // lazy load this dependency; since it's large (~2GB RAM) and may be
-  // accidentally required by a process which doesn't use it.
-  if (!_nodepostal_module) {
-    // load the mock library if MOCK_LIBPOSTAL env var is set
-    if (process.env.MOCK_LIBPOSTAL) {
-      _nodepostal_module = require('../test/lib/mock_libpostal');
-    // otherwise load the real thing
-    } else {
-      _nodepostal_module = require('node-postal');
-    }
-  }
-
-  return _nodepostal_module;
-}
+const MIN_RANGE = 1; // the miniumum amount β is higher than α
+const MAX_RANGE = 6; // the maximum amount β is higher than α
+const MIN_RANGE_HOUSENUMBER = 10; // the minimum acceptible value for both α and β
 
 /**
   analyze input streetname string and return a list of expansions.
 **/
 async function street( streetName ){
-  const postal = get_libpostal();
 
   // use libpostal to expand the address
   let expansions = await postal.expand.expand_address( streetName );

libpostal/LibpostalServiceConfig.js

@@ -0,0 +1,17 @@
+const ServiceConfiguration = require('pelias-microservice-wrapper').ServiceConfiguration;
+
+class LibpostalServiceConfig extends ServiceConfiguration {
+  constructor(config) {
+    super('libpostal', config);
+  }
+  getUrl(params) {
+    return this.baseUrl + params.endpoint;
+  }
+  getParameters(params) {
+    return {
+      address: params.address
+    };
+  }
+}
+
+module.exports = LibpostalServiceConfig;

libpostal/client.js

@@ -0,0 +1,21 @@
+/*
+ * Return the appropriate version of node-postal
+ */
+
+const config = require('pelias-config').generate();
+const serviceIsConfigured = config.get('services.libpostal') || config.get('api.services.libpostal');
+
+// load the mock library if MOCK_LIBPOSTAL env var is set
+if (process.env.MOCK_LIBPOSTAL) {
+  module.exports = require('./mock');
+}
+
+// else use the HTTP webservice when configured
+else if (serviceIsConfigured) {
+  module.exports = require('./service');
+}
+
+// otherwise use the npm module
+else {
+  module.exports = require('./module');
+}