Skip to main content

Deploy a Subgraph to the Hosted Service

If you have not checked out already, check out how to write the files that make up a subgraph manifest and how to install the Graph CLI to generate code for your subgraph. Now, it's time to deploy your subgraph to the Hosted Service, also known as the Hosted Service.

Create a Hosted Service account

Before using the Hosted Service, create an account in our Hosted Service. You will need a Github account for that; if you don't have one, you need to create that first. Then, navigate to the Hosted Service, click on the 'Sign up with Github' button and complete Github's authorization flow.

Store the Access Token

After creating an account, navigate to your dashboard. Copy the access token displayed on the dashboard and run graph auth --product hosted-service <ACCESS_TOKEN>. This will store the access token on your computer. You only need to do this once, or if you ever regenerate the access token.

Create a Subgraph on the Hosted Service

Before deploying the subgraph, you need to create it in The Graph Explorer. Go to the dashboard and click on the 'Add Subgraph' button and fill in the information below as appropriate:

Image - Select an image to be used as a preview image and thumbnail for the subgraph.

Subgraph Name - Together with the account name that the subgraph is created under, this will also define the account-name/subgraph-name-style name used for deployments and GraphQL endpoints. This field cannot be changed later.

Account - The account that the subgraph is created under. This can be the account of an individual or organization. Subgraphs cannot be moved between accounts later.

Subtitle - Text that will appear in subgraph cards.

Description - Description of the subgraph, visible on the subgraph details page.

GitHub URL - Link to the subgraph repository on GitHub.

Hide - Switching this on hides the subgraph in the Graph Explorer.

After saving the new subgraph, you are shown a screen with help on how to install the Graph CLI, how to generate the scaffolding for a new subgraph, and how to deploy your subgraph. The first two steps were covered in the Define a Subgraph section.

Deploy a Subgraph on the Hosted Service

Deploying your subgraph will upload the subgraph files that you've built with yarn build to IPFS and tell the Graph Explorer to start indexing your subgraph using these files.

You deploy the subgraph by running yarn deploy

After deploying the subgraph, the Graph Explorer will switch to showing the synchronization status of your subgraph. Depending on the amount of data and the number of events that need to be extracted from historical Ethereum blocks, starting with the genesis block, syncing can take from a few minutes to several hours. The subgraph status switches to Synced once the Graph Node has extracted all data from historical blocks. The Graph Node will continue inspecting Ethereum blocks for your subgraph as these blocks are mined.

Redeploying a Subgraph

When making changes to your subgraph definition, for example to fix a problem in the entity mappings, run the yarn deploy command above again to deploy the updated version of your subgraph. Any update of a subgraph requires that Graph Node reindexes your entire subgraph, again starting with the genesis block.

If your previously deployed subgraph is still in status Syncing, it will be immediately replaced with the newly deployed version. If the previously deployed subgraph is already fully synced, Graph Node will mark the newly deployed version as the Pending Version, sync it in the background, and only replace the currently deployed version with the new one once syncing the new version has finished. This ensures that you have a subgraph to work with while the new version is syncing.

Deploying the subgraph to multiple Ethereum networks

In some cases, you will want to deploy the same subgraph to multiple Ethereum networks without duplicating all of its code. The main challenge that comes with this is that the contract addresses on these networks are different. One solution that allows to parameterize aspects like contract addresses is to generate parts of it using a templating system like Mustache or Handlebars.

To illustrate this approach, let's assume a subgraph should be deployed to mainnet and Ropsten using different contract addresses. You could then define two config files providing the addresses for each network:

{
"network": "mainnet",
"address": "0x123..."
}

and

{
"network": "ropsten",
"address": "0xabc..."
}

Along with that, you would substitute the network name and addresses in the manifest with variable placeholders {{network}} and {{address}} and rename the manifest to e.g. subgraph.template.yaml:

# ...
dataSources:
- kind: ethereum/contract
name: Gravity
network: mainnet
network: {{network}}
source:
address: '0x2E645469f354BB4F5c8a05B3b30A929361cf77eC'
address: '{{address}}'
abi: Gravity
mapping:
kind: ethereum/events

In order generate a manifest to either network, you could add two additional commands to package.json along with a dependency on mustache:

{
...
"scripts": {
...
"prepare:mainnet": "mustache config/mainnet.json subgraph.template.yaml > subgraph.yaml",
"prepare:ropsten": "mustache config/ropsten.json subgraph.template.yaml > subgraph.yaml"
},
"devDependencies": {
...
"mustache": "^3.1.0"
}
}

To deploy this subgraph for mainnet or Ropsten you would now simply run one of the two following commands:

# Mainnet:
yarn prepare:mainnet && yarn deploy

# Ropsten:
yarn prepare:ropsten && yarn deploy

A working example of this can be found here.

Note: This approach can also be applied more complex situations, where it is necessary to substitute more than contract addresses and network names or where generating mappings or ABIs from templates as well.

Checking subgraph health

If a subgraph syncs successfully, that is a good sign that it will continue to run well forever. However, new triggers on the chain might cause your subgraph to hit an untested error condition or it may start to fall behind due to performance issues or issues with the node operators.

Graph Node exposes a graphql endpoint which you can query to check the status of your subgraph. On the Hosted Service, it is available at https://api.thegraph.com/index-node/graphql. On a local node it is available on port 8030/graphql by default. The full schema for this endpoint can be found here. Here is an example query that checks the status of the current version of a subgraph:

{
indexingStatusForCurrentVersion(subgraphName: "org/subgraph") {
synced
health
fatalError {
message
block {
number
hash
}
handler
}
chains {
chainHeadBlock {
number
}
latestBlock {
number
}
}
}
}

This will give you the chainHeadBlock which you can compare with the latestBlock on your subgraph to check if it is running behind. synced informs if the subgraph has ever caught up to the chain. health can currently take the values of healthy if no errors ocurred, or failed if there was an error which halted the progress of the subgraph. In this case you can check the fatalError field for details on this error.