This bank example let users create their own bank account, deposit, withdraw, transfer money between accounts and check account balances. In this example you will see:
- how a HTTP trigger works with a function
- how a function works with third-party component (database).
- Create database pod
$ kubectl apply -f cockroachdb.yaml- Install go dependencies
$ cd functions/
$ glide install -v- Use
fission specto create application
$ fission spec apply --wait- Check application status
After fission spec apply, you can see that all functions, http triggers and packages are successfully created.
$ fission pkg list
NAME BUILD_STATUS ENV
bank-go-pkg succeeded go
web-pkg succeeded python
$ fission fn list
NAME UID ENV EXECUTORTYPE MINSCALE MAXSCALE MINCPU MAXCPU MINMEMORY MAXMEMORY TARGETCPU
account-create 6d75b1ce-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
account-get 6d7650bf-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
account-login 6d859eb9-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
bank-web 6da3e315-96db-11e8-99ff-080027c3bbd5 python newdeploy 1 1 0 0 0 0 80
options-handler 6dc28a15-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
transaction-deposit 6de123ba-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
transaction-get 6dff7085-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
transaction-transfer 6e1e2804-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
transaction-withdraw 6e3cae13-96db-11e8-99ff-080027c3bbd5 go newdeploy 1 1 0 0 0 0 80
$ fission route list
NAME METHOD HOST URL INGRESS FUNCTION_NAME
3c02fd61-a7b8-4613-bff3-98ed27a53faf POST /transaction/transfer false transaction-transfer
3f74a3a1-edc5-470d-bbcd-4395377705a1 OPTIONS /transaction false options-handler
4452f18c-f9b2-40d6-b676-ee868627e237 OPTIONS /sessions false options-handler
4faa1724-f17c-4d33-9e55-3b44c7625e63 POST /accounts false account-create
6b2be34d-5f07-4426-8baf-951c71db3602 OPTIONS /transaction/transfer false options-handler
6fac456d-d155-422c-8580-c464ba308050 OPTIONS /accounts/ false options-handler
80153f84-023d-4158-914d-5d6affb9fbca GET /accounts/ false account-get
93845c23-eadb-4335-9a1c-1ddec0da19bd OPTIONS /transaction/withdraw false options-handler
995946d7-91e3-4809-85c6-b8405e68dd74 GET /accounts false account-get
9d099a77-b834-4c9d-87c4-10c3475f6f3a POST /sessions false account-login
afc56bc2-00b8-408f-9fd5-78af7bb6c9aa GET /bank/{html:[a-zA-Z0-9\.\/]+} false bank-web
b2b2b163-3d92-4bfb-a23e-50c36d84da73 POST /transaction/deposit false transaction-deposit
b9e13516-4d65-4597-bbb9-927bebe4bdca GET /transaction/ false transaction-get
ba9c8cdb-ad31-4eec-9ae9-00001fdd85e6 OPTIONS /transaction/deposit false options-handler
d089b784-c35c-4b20-a30d-b708aa7f827c POST /accounts/ false account-create
d090606a-3b9d-4550-b46a-d65b7f437d65 POST /transaction/withdraw false transaction-withdraw
e019d4be-fdfe-404a-bfca-5a5b24fe531f OPTIONS /accounts false options-handler
f4ac1efb-179f-4cca-8229-7594d513fc92 GET /transaction false transaction-get
$ kubectl -n bank get pod
NAME READY STATUS RESTARTS AGE
cockroachdb-66cc5bfd9c-p2w8d 1/1 Running 0 3h
$ kubectl -n bank get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
cockroachdb ClusterIP 10.106.44.165 <none> 26257/TCP,8080/TCP 3h
- Visit application website
You shall see a login dialog on browser if everything works well.
http://$(FISSION_ROUTER)/bank/login.html
- When user visits web page with url above, the browser hits web-server http trigger to get web html files.
- Any operations on web page send an AJAX http requests to backend RESTful APIs function.
- Once a function receive requests it interacts with database, which launched in different namespace, to get/insert/update records.
- After database operations, the function response user requests with http code & message body.