3 files changed, 258 insertions, 0 deletions
diff --git a/internal/mappings/mappings.go b/internal/mappings/mappings.go
new file mode 100644
index 0000000..fba7201
--- /dev/null
+++ b/internal/mappings/mappings.go
@@ -0,0 +1,80 @@
+// Copyright 2018 ThousandEyes Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mappings
+
+import (
+	"net"
+	"regexp"
+	"strings"
+)
+
+// Script holds information related to a booting script.
+type Script struct {
+	Name        string
+	Environment string
+	Params      map[string]interface{}
+}
+
+// NetworkMap struct contains an association between a CIDR network and a
+// Script.
+type NetworkMap struct {
+	Network *net.IPNet
+	Script  *Script
+}
+
+// HostnameMap struct contains an association between a hostname regular
+// expression and a Script.
+type HostnameMap struct {
+	Hostname *regexp.Regexp
+	Script   *Script
+}
+
+// FindScriptForHostname receives a HostnameMap and a string (that can be a
+// regular expression), and tries to find a match in that map. If it finds
+// a match, it returns the associated script.
+func FindScriptForHostname(maps []HostnameMap, hostname string) (script *Script, ok bool) {
+	for _, m := range maps {
+		if m.Hostname.MatchString(hostname) {
+			return m.Script, true
+		}
+	}
+	return nil, false
+}
+
+// FindScriptForNetwork receives a NetworkMap and an IP and tries to see if
+// that IP belongs to any of the configured networks. If it finds a match,
+// it returns the associated script.
+func FindScriptForNetwork(maps []NetworkMap, ip string) (script *Script, ok bool) {
+	for _, m := range maps {
+		if m.Network.Contains(net.ParseIP(ip)) {
+			return m.Script, true
+		}
+	}
+	return nil, false
+}
+
+func (s Script) String() string {
+	var result = s.Name + " : { "
+	elems := []string{}
+	if s.Environment != "" {
+		elems = append(elems, "environment: "+s.Environment)
+	}
+	for key, value := range s.Params {
+		elems = append(elems, key+": "+value.(string))
+	}
+	result += strings.Join(elems, ", ") + " }"
+
+	return result
+}
diff --git a/internal/mappings/mappings_test.go b/internal/mappings/mappings_test.go
new file mode 100644
index 0000000..ed45114
--- /dev/null
+++ b/internal/mappings/mappings_test.go
@@ -0,0 +1,100 @@
+// Copyright 2018 ThousandEyes Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mappings
+
+import (
+	"net"
+	"regexp"
+	"testing"
+)
+
+var (
+	mockScriptParams1 = map[string]interface{}{
+		"param11": "param1_value1",
+		"param21": "param2_value1",
+	}
+	mockScriptParams2 = map[string]interface{}{
+		"param12": "param1_value2",
+		"param22": "param2_value2",
+	}
+	mockScript1 = Script{Name: "mock_script1", Params: mockScriptParams1}
+	mockScript2 = Script{Name: "mock_script2", Params: mockScriptParams2}
+
+	mockRegex1, _ = regexp.Compile("mock_host1")
+	mockRegex2, _ = regexp.Compile("mock_host2")
+
+	mockHostNameMap1 = HostnameMap{
+		Hostname: mockRegex1,
+		Script:   &mockScript1,
+	}
+
+	mockHostNameMap2 = HostnameMap{
+		Hostname: mockRegex2,
+		Script:   &mockScript2,
+	}
+
+	_, mockNetwork1, _ = net.ParseCIDR("10.0.0.0/8")
+	_, mockNetwork2, _ = net.ParseCIDR("192.168.0.0/16")
+
+	mockNetworkMap1 = NetworkMap{
+		Network: mockNetwork1,
+		Script:  &mockScript1,
+	}
+	mockNetworkMap2 = NetworkMap{
+		Network: mockNetwork2,
+		Script:  &mockScript2,
+	}
+)
+
+func TestScript(t *testing.T) {
+	expected1 := "mock_script1 : { param11: param1_value1, param21: param2_value1 }"
+	expected2 := "mock_script1 : { param21: param2_value1, param11: param1_value1 }"
+	mockScriptString := mockScript1.String()
+	if mockScriptString != expected1 && mockScriptString != expected2 {
+		t.Errorf("Expected: %s or %s\nGot: %s\n", expected1, expected2, mockScriptString)
+	}
+}
+
+func TestFindScriptForHostname(t *testing.T) {
+	maps := []HostnameMap{mockHostNameMap1, mockHostNameMap2}
+	script, success := FindScriptForHostname(maps, "mock_host1")
+	if !(script.Name == "mock_script1" && success) {
+		t.Error("Hostname should have matched")
+	}
+	script, success = FindScriptForHostname(maps, "mock_host2")
+	if !(script.Name == "mock_script2" && success) {
+		t.Error("Hostname should have matched")
+	}
+	script, success = FindScriptForHostname(maps, "mock_host_bad")
+	if !(script == nil && !success) {
+		t.Error("Hostname should have not matched")
+	}
+}
+
+func TestScriptForNetwork(t *testing.T) {
+	maps := []NetworkMap{mockNetworkMap1, mockNetworkMap2}
+	script, success := FindScriptForNetwork(maps, "10.0.0.1")
+	if !(script.Name == "mock_script1" && success) {
+		t.Error("IP should have matched the network map")
+	}
+	script, success = FindScriptForNetwork(maps, "192.168.0.1")
+	if !(script.Name == "mock_script2" && success) {
+		t.Error("IP should have matched the network map")
+	}
+	script, success = FindScriptForNetwork(maps, "8.8.8.8")
+	if !(script == nil && !success) {
+		t.Error("IP shouildn't have matched the network map")
+	}
+}
diff --git a/internal/mappings/parse.go b/internal/mappings/parse.go
new file mode 100644
index 0000000..64de5bb
--- /dev/null
+++ b/internal/mappings/parse.go
@@ -0,0 +1,78 @@
+// Copyright 2018 ThousandEyes Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mappings
+
+import (
+	"io/ioutil"
+	"os"
+
+	"gopkg.in/yaml.v2"
+
+	"github.com/thousandeyes/shoelaces/internal/log"
+)
+
+// Mappings struct contains YamlNetworkMaps and YamlHostnameMaps.
+type Mappings struct {
+	NetworkMaps  []YamlNetworkMap  `yaml:"networkMaps"`
+	HostnameMaps []YamlHostnameMap `yaml:"hostnameMaps"`
+}
+
+// YamlNetworkMap struct contains an association between a CIDR network and a
+// Script. It's different than mapping.NetworkMap in the sense that this
+// struct can be used to parse the JSON mapping file.
+type YamlNetworkMap struct {
+	Network string
+	Script  YamlScript
+}
+
+// YamlHostnameMap struct contains an association between a hostname regular
+// expression and a Script. It's different than mapping.HostnameMap in the
+// sense that this struct can be used to parse the JSON mapping file.
+type YamlHostnameMap struct {
+	Hostname string
+	Script   YamlScript
+}
+
+// YamlScript holds information regarding a script. Its name, its environment
+// and its parameters.
+type YamlScript struct {
+	Name        string
+	Environment string
+	Params      map[string]string
+}
+
+// ParseYamlMappings parses the mappings yaml file into a Mappings struct.
+func ParseYamlMappings(logger log.Logger, mappingsFile string) *Mappings {
+	var mappings Mappings
+
+	logger.Info("component", "config", "msg", "Reading mappings", "source", mappingsFile)
+	yamlFile, err := ioutil.ReadFile(mappingsFile)
+
+	if err != nil {
+		logger.Error(err)
+		os.Exit(1)
+	}
+
+	mappings.NetworkMaps = make([]YamlNetworkMap, 0)
+	mappings.HostnameMaps = make([]YamlHostnameMap, 0)
+
+	err = yaml.Unmarshal(yamlFile, &mappings)
+	if err != nil {
+		logger.Error(err)
+		os.Exit(1)
+	}
+
+	return &mappings
+}