/// <summary>
/// Traverses the nodes inheritance path to build a single flat delimeted line of
/// inheritance paths.
/// e.g. returns "Prod,Uat,Qa,Dev".
/// </summary>
/// <returns></returns>
public static string ConvertNestedToFlatInheritance(EnvItem env, IDictionary <string, EnvItem> envItems)
{
// Return name of environment provided if it doesn't have
// any inheritance chain.
if (string.IsNullOrEmpty(env.Inherits))
{
return(env.Name);
}
// Single parent.
if (env.Inherits.IndexOf(",") < 0)
{
// Get the parent.
EnvItem parent = envItems[env.Inherits.Trim().ToLower()];
return(env.Name + "," + ConvertNestedToFlatInheritance(parent, envItems));
}
// Multiple parents.
string[] parents = env.Inherits.Split(',');
string path = env.Name;
foreach (string parent in parents)
{
EnvItem parentEnv = envItems[env.Inherits.Trim().ToLower()];
path += "," + ConvertNestedToFlatInheritance(parentEnv, envItems);
}
return(path);
}
/// <summary>
/// Get list of inherited environments.
/// </summary>
/// <param name="selectedEnv">"prod,qa,dev"</param>
/// <param name="firstEnv"></param>
/// <returns></returns>
public static List <EnvItem> Parse(string selectedEnv, out string firstEnv)
{
// Validate.
if (string.IsNullOrEmpty(selectedEnv))
{
throw new ArgumentException("Must provide the selected environment.");
}
List <string> envsSelected = ParseEnvsToNames(selectedEnv);
// Create the environment.
firstEnv = envsSelected[0];
EnvItem env = new EnvItem(firstEnv, false, EnvUtils.GetEnvType(firstEnv), string.Empty);
List <EnvItem> envs = new List <EnvItem>()
{
env
};
// More than 1 supplied. This represents an inheritance path.
if (envsSelected.Count > 1)
{
for (int ndx = 1; ndx < envsSelected.Count; ndx++)
{
string envName = envsSelected[ndx];
var newEnv = new EnvItem(envName, false, EnvUtils.GetEnvType(envName), "");
envs.Add(newEnv);
// Append the inheritance path to the first one.
envs[0].Inherits += (string.IsNullOrEmpty(env.Inherits)) ? envName : "," + envName;
}
}
return(envs);
}
/// <summary>
/// Set the current environment.
/// </summary>
/// <param name="envName"></param>
public void Set(string envName)
{
if (!_ctx.EnvsByName.ContainsKey(envName))
{
throw new ArgumentException("Environment " + envName + " does not exist.");
}
// set the current environment.
_current = _ctx.EnvsByName[envName];
Load();
// Notify.
if (OnEnvironmentChange != null)
{
OnEnvironmentChange(this, new EventArgs());
}
}
/// <summary>
/// Set the current environment.
/// </summary>
/// <param name="envName"></param>
public void Change(string envName)
{
envName = envName.ToLower().Trim();
if (!_availableEnvs.ContainsKey(envName))
{
throw new ArgumentException("Environment " + envName + " does not exist.");
}
// Set the current environment and Name.
_selected = _availableEnvs[envName];
Name = envName;
// Get list of all available environment names.
_availableEnvNames = (from env in _availableEnvsList select env.Name).ToList <string>();
// Notify.
if (OnEnvironmentChange != null)
{
OnEnvironmentChange(this, new EventArgs());
}
}
/// <summary>
/// Set the current environment.
/// </summary>
/// <param name="envName"></param>
public void Change(string envName)
{
envName = envName.ToLower().Trim();
if (!_availableEnvs.ContainsKey(envName))
{
throw new ArgumentException("Environment " + envName + " does not exist.");
}
// 1: Set the current environment and Name.
_selected = _availableEnvs[envName];
Name = envName;
// 2. Get list of all available environment names.
_availableEnvNames = (from env in _availableEnvsList select env.Name).ToList <string>();
// 3. Get the inheritance chain if applicable.
// e.g. if prod inherits from qa. List containing Prod,Qa
_inheritancePath = EnvUtils.ConvertNestedToFlatInheritance(_selected, _availableEnvs);
// 4. Get the ref path.
// If inherited, then combine all the ref paths.
// e.g. if prod(prod.config) inherits qa(qa.config) inherits dev(dev.config)
// refPath = "prod.config,qa.config,dev.config".
if (string.IsNullOrEmpty(_selected.Inherits))
{
_refPath = _selected.RefPath;
}
else
{
List <EnvItem> inheritanceChain = EnvUtils.LoadInheritance(_selected, _availableEnvs);
_refPath = EnvUtils.CollectEnvironmentProps(inheritanceChain, ",", env => env.RefPath);
}
// Notify.
if (OnEnvironmentChange != null)
{
OnEnvironmentChange(this, new EventArgs());
}
}
/// <summary>
/// Loads an inheritance chain delimited by ,(comma)
/// </summary>
/// <param name="delimitedInheritancePath"></param>
/// <param name="ctx"></param>
/// <returns></returns>
public static List <EnvItem> LoadInheritance(EnvItem coreEnv, IDictionary <string, EnvItem> envItems)
{
// No inheritance chain.
if (string.IsNullOrEmpty(coreEnv.Inherits))
{
return new List <EnvItem>()
{
coreEnv
}
}
;
string inheritancePath = coreEnv.Inherits;
StringBuilder buffer = new StringBuilder();
// Get flat list "prod,uat,qa,dev" from traversing the refrenced nodes.
if (coreEnv.InheritsDeeply)
{
inheritancePath = ConvertNestedToFlatInheritance(coreEnv, envItems);
}
string[] parents = inheritancePath.Split(',');
List <EnvItem> inheritanceList = new List <EnvItem>()
{
coreEnv
};
// Build inheritance path where the first one is the core, following the
// older parents.
foreach (string parent in parents)
{
if (envItems.ContainsKey(parent))
{
EnvItem parentEnv = envItems[parent];
inheritanceList.Add(parentEnv);
}
}
return(inheritanceList);
}
/// <summary>
/// Parse the selected environments and config paths.
/// </summary>
/// <param name="envs">
/// 1. "prod,qa,dev". If the names are the same as the types.
/// 2. "prod1:prod,qa1:qa,mydev:dev" If the names are different that the env type names.
/// </param>
/// <returns>List of environment items.</returns>
public static List <EnvItem> ParseEnvsToItems(string envs)
{
string[] envNames = envs.Contains(",") ? envs.Split(',') : new string[] { envs };
var envItems = new List <EnvItem>();
foreach (string env in envNames)
{
// Check for ":" which indicates name/type pair.
string envName = env;
string envType = env;
if (env.Contains(":"))
{
envName = env.Substring(0, env.IndexOf(":"));
envType = env.Substring(env.IndexOf(":") + 1);
}
EnvItem item = new EnvItem();
item.Name = envName;
item.EnvType = EnvUtils.GetEnvType(envType);
item.IsSelectable = true;
item.Inherits = string.Empty;
envItems.Add(item);
}
return(envItems);
}
/// <summary>
/// Set the current environment and also supply available environment names/types.
/// </summary>
/// <param name="selected">"prod" or "prod1". This should match the name
/// from <paramref name="availableEnvsCommaDelimited"/></param>
/// <param name="availableEnvsCommaDelimited">
/// 1. "prod,qa,dev". If the names are the same as the types.
/// 2. "prod1:prod,qa1:qa,mydev:dev" If the names are different that the env type names.
/// </param>
/// <param name="refPaths">The config reference paths. e.g. "prod.config,qa.config".</param>
/// <param name="enableInheritance">Whether or not environment inheritance is enabled.</param>
public static void Set(string selected, string availableEnvsCommaDelimited, string refPaths, bool distributeRefPaths, bool enableInheritance)
{
// Check available envs were supplied.
if (string.IsNullOrEmpty(availableEnvsCommaDelimited))
{
availableEnvsCommaDelimited = "prod,uat,qa,dev";
}
// Parse "prod,uat,qa,dev" to List of EnvItems.
var availableEnvs = EnvUtils.ParseEnvsToItems(availableEnvsCommaDelimited);
// Environment Inheritance enabled. Default setup is :
// e.g. Available Environments are "prod,uat,qa,dev".
// Default inheritance becomes :
// prod inherits uat
// uat inherits qa
// qa inherits dev
if (enableInheritance)
{
for (int ndx = 0; ndx <= availableEnvs.Count - 2; ndx++)
{
availableEnvs[ndx].Inherits = availableEnvs[ndx + 1].Name;
}
foreach (EnvItem env in availableEnvs)
{
env.InheritsDeeply = true;
}
}
// Check if refpaths(configs) were supplied.
bool hasConfigs = !string.IsNullOrEmpty(refPaths);
string[] configs = hasConfigs ? refPaths.Split(',') : new string[] { };
EnvItem selectedEnv = (from env in availableEnvs where string.Compare(env.Name, selected, true) == 0 select env).First <EnvItem>();
if (hasConfigs)
{
// Case 1: Single config file = "prod.config"
if (configs.Length == 1)
{
selectedEnv.RefPath = refPaths;
}
// Case 2: Multiple config files "prod.config,qa.config" and not distributing across the env's.
// This means that ref paths "prod.config,qa.config" will be set on "selected" environment.
else if (configs.Length > 1 && !distributeRefPaths)
{
selectedEnv.RefPath = refPaths;
}
// Case 3: Multiple config files should be distributed to each environment.
// e.g. "prod,qa,dev", "prod.config,qa.config,dev.config".
// Apply prod.config to "prod" refpath, qa.config to "qa" refPath, dev.config to "dev" refpath.
else if (configs.Length > 1 && distributeRefPaths)
{
string error = string.Format("The number of reference paths({0}) must be less than or equal to the number of environments({1}).",
configs.Length, availableEnvs.Count);
Guard.IsTrue(availableEnvs.Count >= configs.Length, error);
for (int ndx = 0; ndx < availableEnvs.Count; ndx++)
{
availableEnvs[ndx].RefPath = configs[ndx];
}
}
}
Set(Default, selected, availableEnvs);
}
