获取配置
curl -i http://config-server-host:port/{application}/{proflie}
主要过程
ResourceController
@RequestMapping("/{name}/{profile}/{label}/**")
public String resolve(@PathVariable String name, @PathVariable String profile,
@PathVariable String label, HttpServletRequest request) throws IOException {
String path = getFilePath(request, name, profile, label);
return resolve(name, profile, label, path);
}
resolve方法
synchronized String resolve(String name, String profile, String label, String path)
throws IOException {
if (label != null && label.contains("(_)")) {
// "(_)" is uncommon in a git branch name, but "/" cannot be matched
// by Spring MVC
label = label.replace("(_)", "/");
}
StandardEnvironment environment = prepareEnvironment(
this.environmentRepository.findOne(name, profile, label));
// ensure InputStream will be closed to prevent file locks on Windows
try (InputStream is = this.resourceRepository.findOne(name, profile, label, path)
.getInputStream()) {
String text = StreamUtils.copyToString(is, Charset.forName("UTF-8"));
return resolvePlaceholders(environment, text);
}
}
GenericResourceRepository.findOne
public synchronized Resource findOne(String application, String profile, String label,
String path) {
String[] locations = this.service.getLocations(application, profile, label).getLocations();
try {
for (int i = locations.length; i-- > 0;) {
String location = locations[i];
for (String local : getProfilePaths(profile, path)) {
Resource file = this.resourceLoader.getResource(location)
.createRelative(local);
if (file.exists() && file.isReadable()) {
return file;
}
}
}
}
catch (IOException e) {
throw new NoSuchResourceException(
"Error : " + path + ". (" + e.getMessage() + ")");
}
throw new NoSuchResourceException("Not found: " + path);
}
JGitEnvironmentRepository.getLocations
public synchronized Locations getLocations(String application, String profile,
String label) {
if (label == null) {
label = this.defaultLabel;
}
String version = refresh(label);
return new Locations(application, profile, label, version,
getSearchLocations(getWorkingDirectory(), application, profile, label));
}
refresh
/**
* Get the working directory ready.
*/
private String refresh(String label) {
initialize();
Git git = null;
try {
git = createGitClient();
if (shouldPull(git)) {
fetch(git, label);
//checkout after fetch so we can get any new branches, tags, ect.
checkout(git, label);
if(isBranch(git, label)) {
//merge results from fetch
merge(git, label);
if (!isClean(git)) {
logger.warn("The local repository is dirty. Resetting it to origin/"
+ label + ".");
resetHard(git, label, "refs/remotes/origin/" + label);
}
}
}
else{
//nothing to update so just checkout
checkout(git, label);
}
//always return what is currently HEAD as the version
return git.getRepository().getRef("HEAD").getObjectId().getName();
}
catch (RefNotFoundException e) {
throw new NoSuchLabelException("No such label: " + label);
}
catch (GitAPIException e) {
throw new IllegalStateException("Cannot clone or checkout repository", e);
}
catch (Exception e) {
throw new IllegalStateException("Cannot load environment", e);
}
finally {
try {
if (git != null) {
git.close();
}
}
catch (Exception e) {
this.logger.warn("Could not close git repository", e);
}
}
}
shouldPull
public /*public for testing*/ boolean shouldPull(Git git) throws GitAPIException {
boolean shouldPull;
Status gitStatus = git.status().call();
boolean isWorkingTreeClean = gitStatus.isClean();
String originUrl = git.getRepository().getConfig().getString("remote", "origin",
"url");
if (this.forcePull && !isWorkingTreeClean) {
shouldPull = true;
logDirty(gitStatus);
}
else {
shouldPull = isWorkingTreeClean && originUrl != null;
}
if (!isWorkingTreeClean && !this.forcePull) {
this.logger.info("Cannot pull from remote " + originUrl
+ ", the working tree is not clean.");
}
return shouldPull;
}
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