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343 lines (299 loc) · 8.27 KB
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package com.sendgrid;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* This class is the base interface to the Twilio SendGrid Web API.
*/
public abstract class BaseInterface implements SendGridAPI {
private static final String VERSION = "4.6.4";
private static final String USER_AGENT = "sendgrid/" + VERSION + ";java";
private static final int RATE_LIMIT_RESPONSE_CODE = 429;
private static final int THREAD_POOL_SIZE = 8;
private ExecutorService pool;
/**
* The host to which to connect.
*/
private String host;
/**
* The API version.
*/
private String version;
/**
* The HTTP client.
*/
private Client client;
/**
* The request headers container.
*/
private Map<String, String> requestHeaders;
/**
* The number of times to try after a rate limit.
*/
private int rateLimitRetry;
/**
* The number of milliseconds to sleep between retries.
*/
private int rateLimitSleep;
/**
* The subuser to be impersonated.
*/
private String subuser;
/**
* Construct a new API wrapper.
*/
public BaseInterface() {
this.client = new Client();
}
/**
* Construct a new API wrapper.
*
* @param test is true if you are unit testing
*/
public BaseInterface(final Boolean test) {
this.client = new Client(test);
}
/**
* Construct a new API wrapper.
*
* @param client the Client to use (allows to customize its configuration)
*/
public BaseInterface(final Client client) {
this.client = client;
}
/**
* Initialize the client.
*
* @param auth authorization header value
* @param host the base URL for the API
*/
public void initialize(final String auth, final String host) {
this.host = host;
this.version = "v3";
this.requestHeaders = new HashMap<>();
this.requestHeaders.put("Authorization", auth);
this.requestHeaders.put("User-Agent", USER_AGENT);
this.requestHeaders.put("Accept", "application/json");
this.rateLimitRetry = 5;
this.rateLimitSleep = 1100;
this.pool = Executors.newFixedThreadPool(THREAD_POOL_SIZE);
}
/**
* Get the current library version.
*
* @return the current version
*/
public String getLibraryVersion() {
return VERSION;
}
/**
* Get the API version.
*
* @return the current API version
*/
public String getVersion() {
return this.version;
}
/**
* Set the API version.
*
* @param version the new version
*/
public void setVersion(final String version) {
this.version = version;
}
/**
* Get the request headers.
*
* @return the request headers
*/
public Map<String, String> getRequestHeaders() {
return this.requestHeaders;
}
/**
* Add/update a request header.
*
* @param key the header key
* @param value the header value
* @return the new set of request headers
*/
public Map<String, String> addRequestHeader(final String key, final String value) {
this.requestHeaders.put(key, value);
return getRequestHeaders();
}
/**
* Remove a request header.
*
* @param key the header key to remove
* @return the new set of request headers
*/
public Map<String, String> removeRequestHeader(final String key) {
this.requestHeaders.remove(key);
return getRequestHeaders();
}
/**
* Get the host.
*
* @return the host
*/
public String getHost() {
return this.host;
}
/**
* Set the host.
*
* @param host the new host
*/
public void setHost(final String host) {
this.host = host;
}
/**
* Get the maximum number of retries on a rate limit response.
* The default is 5.
*
* @return the number of retries on a rate limit
*/
public int getRateLimitRetry() {
return this.rateLimitRetry;
}
/**
* Set the maximum number of retries on a rate limit response.
*
* @param rateLimitRetry the maximum retry count
*/
public void setRateLimitRetry(final int rateLimitRetry) {
this.rateLimitRetry = rateLimitRetry;
}
/**
* Get the duration of time (in milliseconds) to sleep between
* consecutive rate limit retries. The Twilio SendGrid API enforces
* the rate limit to the second. The default value is 1.1 seconds.
*
* @return the sleep duration
*/
public int getRateLimitSleep() {
return this.rateLimitSleep;
}
/**
* Set the duration of time (in milliseconds) to sleep between
* consecutive rate limit retries.
*
* @param rateLimitSleep the sleep duration
*/
public void setRateLimitSleep(final int rateLimitSleep) {
this.rateLimitSleep = rateLimitSleep;
}
/**
* Impersonate subuser for subsequent requests
*
* @param subuser the subuser to be impersonated
*/
public void addImpersonateSubuser(final String subuser) {
this.subuser = subuser;
this.addRequestHeader("on-behalf-of", subuser);
}
/**
* Stop Impersonating the subuser
*/
public void removeImpersonateSubuser() {
this.subuser = null;
this.removeRequestHeader("on-behalf-of");
}
/**
* Get the impersonated subuser or null if empty
*
* @return the impersonated subuser
*/
public String getImpersonateSubuser() {
return this.subuser;
}
/**
* Makes the call to the Twilio SendGrid API, override this method for testing.
*
* @param request the request to make
* @return the response object
* @throws IOException in case of a network error
*/
public Response makeCall(final Request request) throws IOException {
return client.api(request);
}
/**
* Class api sets up the request to the Twilio SendGrid API, this is main interface.
*
* @param request the request object
* @return the response object
* @throws IOException in case of a network error
*/
public Response api(final Request request) throws IOException {
final Request req = new Request();
req.setMethod(request.getMethod());
req.setBaseUri(this.host);
req.setEndpoint("/" + version + "/" + request.getEndpoint());
req.setBody(request.getBody());
for (final Map.Entry<String, String> header : this.requestHeaders.entrySet()) {
req.addHeader(header.getKey(), header.getValue());
}
for (final Map.Entry<String, String> queryParam : request.getQueryParams().entrySet()) {
req.addQueryParam(queryParam.getKey(), queryParam.getValue());
}
return makeCall(req);
}
/**
* Attempt an API call. This method executes the API call asynchronously
* on an internal thread pool. If the call is rate limited, the thread
* will retry up to the maximum configured time.
*
* @param request the API request
*/
public void attempt(final Request request) {
this.attempt(request, new APICallback() {
@Override
public void error(final Exception ex) {
}
public void response(final Response r) {
}
});
}
/**
* Attempt an API call. This method executes the API call asynchronously
* on an internal thread pool. If the call is rate limited, the thread
* will retry up to the maximum configured time. The supplied callback
* will be called in the event of an error, or a successful response.
*
* @param request the API request
* @param callback the callback
*/
public void attempt(final Request request, final APICallback callback) {
this.pool.execute(new Runnable() {
@Override
public void run() {
Response response;
// Retry until the retry limit has been reached.
for (int i = 0; i < rateLimitRetry; ++i) {
try {
response = api(request);
} catch (IOException ex) {
// Stop retrying if there is a network error.
callback.error(ex);
return;
}
// We have been rate limited.
if (response.getStatusCode() == RATE_LIMIT_RESPONSE_CODE) {
try {
Thread.sleep(rateLimitSleep);
} catch (InterruptedException ex) {
// Can safely ignore this exception and retry.
}
} else {
callback.response(response);
return;
}
}
// Retries exhausted. Return error.
callback.error(new RateLimitException(request, rateLimitRetry));
}
});
}
}
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